EPAC08 - List of Keywords (injection)

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injection

Paper	Title	Other Keywords	Page
MOZCG01	Top-Up Operation in Light Sources	storage-ring, booster, emittance, single-bunch	36
	H. Ohkuma JASRI/SPring-8, Hyogo-ken
	The top-up operation for user experiments has been performed at several light sources, and at most of the new light sources the top-up operation is considered in their design phase. In this paper, an overview of the top-up status in light sources is presented, including the performance of injectors for top-up in light sources, technological aspects, examples and operational data from existing machines and proposed upgrades, etc.
	Slides

MOZCM01	Commissioning and Operation of the 1.5 GeV Harmonic Double Sided Microtron at Mainz University	linac, dipole, recirculation, microtron	51
	A. Jankowiak, K. Aulenbacher, D. Bender, O. Chubarov, M. Dehn, H. Euteneuer, F. Fichtner, B. Gutheil, F. Hagenbuck, R. H. Herr, P. Jennewein, K.-H. Kaiser, W. Klag, H. J. Kreidel, U. Ludwig-Mertin, A. Nuck, J. R. Röthgen, B. Seckler, G. S. Stephan, V. Tioukine, G. Woell, Th. Zschocke IKP, Mainz
	In December 2006 the 4th stage of the Mainz Microtron MAMI has been succesfully set into operation expanding the 855MeV output energy of the existing three racetrack microtron cascade (MAMI B) to 1508MeV. This new recirculating cw electron accelerator is realised as a worldwide unique Harmonic Double Sided Microtron (HDSM, []). Since February 2006, after only 14 day of commissioning, the HDSM serves as part of the MAMI C accelerator cascade in routine 24h a day operation for nuclear physics experiments. We will give a brief overview of the design and construction of the HDSM and describe in detail the experiences gained during commissioning and the first year of operation. [] A. Jankowiak et al., "Status Report on the Harmonic Double Sided Microtron of MAMI C", Proceedings EPAC2006, Edinburgh, p. 834**
	Slides

MOPC008	The Impact of PSK Timing on Energy Stability of e-Beam at FERMI@ELETTRA	linac, klystron, simulation, synchrotron	82
	G. D'Auria, P. Delgiusto, M. M. Milloch, C. Serpico, D. Wang ELETTRA, Basovizza, Trieste
	The existing linac sections S1-S7 at ELETTRA will be upgraded for the FERMI@ELETTRA FEL project. These seven sections are 3/4 π-mode backward traveling wave (BTW) constant-impedance structures, powered by 45-MW klystrons (Thales TH 2132A) and with a SLED system to increase the RF peak power. Because of the strict requirement on the pulse-to-pulse beam energy stability (<0.1%) of the FERMI@ELETTRA project, the impact of phase shift keying (PSK), the timing of phase flipping, on beam energy needs to be revisited and evaluated. Here the results obtained with a simulation model built up by use of MATLAB simulink are present and discussed.

MOPC018	Seeding the FEL of the SCSS Test Accelerator with the 5th Harmonic of a Ti: Sa Laser Produced in Gases	undulator, laser, radiation, electron	109
	G. Lambert, O. V. Chubar, M.-E. Couprie SOLEIL, Gif-sur-Yvette M. Bougeard, B. Carré, D. Garzella, O. B. Gobert, M. Labat, H. Merdji, P. Salieres CEA, Gif-sur-Yvette T. Hara, T. Ishikawa, H. Kitamura, T. Shintake, M. Yabashi RIKEN/SPring-8, Hyogo K. Tahara, Y. T. Tanaka, T. Tanikawa RIKEN Spring-8 Harima, Hyogo
	We present the strong amplification of the 5th harmonic of a Ti: Sa laser (10 Hz, 100 fs) generated in a Xe gas cell, i.e. 160 nm, and the generation of intense and coherent odd and even Non Linear Harmonics (NLH) from 80 nm to 23 nm. The experiment has been carried out on the SCSS (SPring-8 Compact SASE Source, Japan) Test Accelerator FEL. This facility is mainly based on a thermionic cathode electron gun, a C-band LINAC (5712 MHz, 35 MV/m) and an in-vacuum undulator (15 mm of period, 2 sections of 4.5 m length). The external source is properly focused in the first undulator section in order to efficiently interact with the electron beam (150 MeV, 10 Hz, 0.5-3 ps). In case of high peak current mode, the 160 nm seed light is amplified by a factor of 7000 in the first undulator section. Moreover, the amplification can be observed even for very low HHG seed level. This result opens new perspectives for seeding at short wavelengths in the XUV to soft X-Ray region. Association with NLH, HGHG (High Gain Harmonic Generation) and/or cascade schemes would allow the generation of fully coherent X-ray radiations from the “water window” spectral range to the Angstrom region.

MOPC037	Single Spike Operation in SPARC SASE-FEL	radiation, emittance, undulator, simulation	154
	V. Petrillo, I. Boscolo Universita' degli Studi di Milano, Milano A. Bacci, S. Cialdi, L. Serafini INFN-Milano, Milano R. Bonifacio, M. Boscolo, M. Ferrario, C. Vaccarezza INFN/LNF, Frascati (Roma) F. Castelli Università degli Studi di Milano, Milano L. Giannessi, C. Ronsivalle ENEA C. R. Frascati, Frascati (Roma) L. Palumbo Rome University La Sapienza, Roma S. Reiche, J. B. Rosenzweig UCLA, Los Angeles, California M. Serluca INFN-Roma, Roma
	We describe in this paper a possible experiment with the existing SPARC photoinjector to test the generation of sub-picosecond high brightness electron bunches able to produce single spike radiation pulses at 500 nm in the SPARC self-amplified spontaneous emission free-electron laser (SASE-FEL). The main purpose of the experiment will be the production of short electron bunches as long as few SASE cooperation lengths and to validate scaling laws to foresee operation at shorter wavelength in the future operation with SPARX. The basic physics, the experimental parameters and 3-D simulations are discussed. Complete start-to-end simulations with realistic SPARC parameters are presented, in view of an experiment for tests on superradiant theory with the existing hardware.

MOPC047	Status of Kharkov X-ray Generator NESTOR Based on Compton Back Scattering	electron, storage-ring, laser, scattering	175
	I. M. Karnaukhov, V. P. Androsov, E. V. Bulyak, A. N. Dovbnya, I. V. Drebot, P. Gladkikh, V. A. Grevtsev, Yu. N. Grigor'ev, A. Gvozd, V. E. Ivashchenko, I. I. Karnaukhov, N. Kovalyova, V. P. Kozin, V. P. Lyashchenko, V. S. Margin, N. I. Mocheshnikov, A. Mytsykov, I. M. Neklyudov, F. A. Peev, A. Reuzaev, A. A. Shcherbakov, S. Sheyko, V. L. Skirda, Y. N. Telegin, V. I. Trotsenko, A. Y. Zelinsky, O. D. Zvonarjova NSC/KIPT, Kharkov J. I.M. Botman TUE, Eindhoven
	The purpose of the NESTOR (New Electron STOrage Ring) project is to create intense X-ray generator based on compact storage ring and Compton back scattering in the National Science Centre “Kharkov Institute of Physics and Technology”. It allows to carry out investigations in the wide range of fundamental and applied sciences such as physics, biology, medicine and so on. The facility consists of the compact 40-225 MeV storage ring, linear 35-90 MeV electron accelerator as an injector, transportation system and Nd:Yag laser and optical cavity. In addition to hard Compton radiation it is supposed to use 4 soft vacuum ultraviolet radiation channels of natural synchrotron radiation of dipole. The facility is going to be in operation in the middle of 2009 and the expected X-rays flux will be of about 10¹³ phot/s. In the paper the main facility parameters are presented.

MOPC060	Transverse Resistive-wall Wake of a Round Pipe with Finite Thickness and its Effect on the ERL Multi-bunch Beam	impedance, simulation, vacuum, lattice	202
	N. Nakamura ISSP/SRL, Chiba
	We already started to study the effect of resistive-wall wake on the multi-bunch beam in an ERL (energy recovery linac)-based light source, because resistive-wall beam breakup(RWBBU) could be caused by the cumulative transverse wake generated by interaction between the resistive vacuum pipe and the intense multi-bunch beam. However the resistive-wall wake function of a round pipe used so far for studying the RWBBU was valid only in a limited time range and improper to the RWBBU simulation for a longer time period. Therefore we analytically derived an exact expression of resistive-wall impedance of a round pipe with finite thickness over all the frequency range and numerically calculated the resistive-wall wake functions of several different pipes from the exact impedance expression. The calculated wake functions enabled us to study and simulate the beam behavior in an ERL made of the pipes accurately. We will present the transverse resistive-wall wake of a round pipe with finite thickness and its effect on the ERL multi-bunch beam. N. Nakamura et al., Proceedings of PAC07, Albuquerque, June 2007, pp. 1010-1012.

MOPC105	Activities of Hitachi Relating to Construction of J-PARC Accelerator	power-supply, synchrotron, linac, rfq	310
	Y. Chida, S. Koseki Hitachi Ltd., Ibaraki-ken M. Abe Hitachi, Ltd., Power & Industrial Systems R&D Laboratory, Ibaraki-ken K. Nakamura, M. Watanabe, T. Watanabe, T. Watanuki Hitachi. Ltd., Hitachi Works, Hitachi-shi
	The Japan Proton Accelerator Research Complex (J-PARC) consists of a 330-m-long linac, a 3-GeV rapid cycle synchrotron with a circumference of 350 m, and a 50-GeV synchrotron with a circumference of 1,570 m. Owing to a collaboration between the Japan Atomic Energy Agency (JAEA) and the High Energy Accelerator Research Organization (KEK), the accelerators will be commencing operations at the site of JAEA Tokai Research and Development Center. The beam commissioning of the entire accelerator system is planned to take place before the end of 2008. Along with the JAEA and KEK, Hitachi has contributed to the construction of the system by manufacturing some major equipment with specifications that are of the highest level in the world.

MOPC106	Injection and Acceleration of Au³¹⁺ in the BNL AGS	ion, electron, vacuum, acceleration	313
	W. Fischer, L. Ahrens, K. A. Brown, C. J. Gardner, J. W. Glenn, H. Huang, M. Mapes, J. Morris, V. Schoefer, L. Smart, P. Thieberger, N. Tsoupas, K. L. Unger, K. Zeno, S. Y. Zhang BNL, Upton, Long Island, New York C. Omet, P. J. Spiller GSI, Darmstadt
	Injection and acceleration of ions in a lower charge state reduces space charge effects, and, if further electron stripping is needed, may allow elimination of a stripping stage and the associated beam losses. The former is of interest to the accelerators of the GSI FAIR complex, the latter for BNL RHIC collider operation at energies lower than the current injection energy. Lower charge state ions, however, have a higher likelihood of electron stripping which can lead to dynamic pressures rises and subsequent beam losses. We report on experiments in the AGS where Au³¹⁺ ions were injected and accelerated instead of the normally used Au⁷⁷⁺ ions. Beam intensities and the average pressure in the AGS ring are recorded, and compared with calculations for dynamic pressures and beam losses. The experimental results will be used to benchmark the STRAHLSIM dynamic vacuum code and will be incorporated in the GSI FAIR SIS100 design.

MOPC108	AGS Polarized Proton Operation in Run 8	resonance, polarization, emittance, extraction	316
	H. Huang, L. Ahrens, M. Bai, K. A. Brown, C. J. Gardner, J. W. Glenn, F. Lin, A. U. Luccio, W. W. MacKay, T. Roser, S. Tepikian, N. Tsoupas, K. Yip, A. Zelenski, K. Zeno BNL, Upton, Long Island, New York H. M. Spinka, D. G. Underwood ANL, Argonne, Illinois
	A dual partial snake scheme has been used for AGS polarized proton operation for several years. It has provided polarized proton beams with 1.5*10¹¹ protons per bunch and 65% polarization for the RHIC spin program. There is still residual polarization loss due to both snake resonances and horizontal resonances. Several schemes were tested in the AGS to mitigate the loss. This paper presents the experiment results and analysis.

MOPC122	Experiments with Fe-ion Beam Generation Acceleration and Accumulation in ITEP-TWAC Facility	ion, target, laser, vacuum	352
	B. Y. Sharkov, P. N. Alekseev, N. N. Alexeev, A. Balabaev, V. I. Nikolaev, V. A. Schegolev, A. Shumshurov, V. P. Zavodov ITEP, Moscow Y. Satov SRC RF TRINITI, Moscow region
	The laser ion source (LIS) developed in collaboration ITEP-TRINITI-CERN with an upgraded version of powerful 100J CO2-laser has been used for Fe-ion beam generation at the input of the pre-injector U-3 delivering separated species of Fe¹⁶⁺ ions with energy of 1.1 MeV/u to booster synchrotron UK for acceleration up to the energy of 160 MeV/u and accumulation in the storage ring U-10 using multiple charge exchange injection technique. First results of Fe-ion beam treating from laser ion source to accumulator ring are presented.

MOPC125	The HESR RF-system and Tests in COSY	target, acceleration, synchrotron, antiproton	361
	R. Stassen, K. Bongardt, F. J. Etzkorn, H. Stockhorst FZJ, Jülich A. Schnase JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
	Two RF cavities will be installed in the High-Energy Storage Ring (HESR) of the future International Facility for Antiproton and Ion Research (FAIR) at the GSI in Darmstadt, one “small” cavity for barrier-bucket operation and one “large” cavity to accelerate and decelerate the beam and for bunch rotation. Additionally a barrier bucket with h=1..5 will be formed by this cavity to separate the decelerated beam from the refilled beam in the high luminosity mode (HL). Both prototype cavities have been built and first RF measurements were carried out. The recent results will be presented.

MOPC126	Beam Acceleration with Full-digital LLRF Control System in the J-PARC RCS	controls, acceleration, feedback, synchrotron	364
	F. Tamura, K. Haga, K. Hasegawa, M. Nomura, A. Schnase, M. Yamamoto JAEA/J-PARC, Tokai-mura S. Anami, E. Ezura, K. Hara, C. Ohmori, A. Takagi, M. Toda, M. Yoshii KEK, Ibaraki
	In the J-PARC RCS (Rapid Cycling Synchrotron) we employ a full-digital LLRF control system to accelerate an ultra-high intensity proton beam. The key feature is the multi-harmonic RF signal generation by using direct digital synthesis (DDS) technology. By employing a full-digital system, highly accurate, stable and reproductive RF voltages are generated in the wide-band RF cavities loaded by magnetic alloy (MA) cores. The beam commissioning of the J-PARC RCS has been started in October 2007. The accelerators, the linac and the RCS, show good stability. The beam orbit and the longitudinal beam shape and phase are reproductive from cycle to cycle especially thanks to the stability of the linac energy, the RCS bending field and the frequency and voltage of the RCS RF. This reproductivity makes the beam commissioning efficient. We present the examples of the orbit signals and the longitudinal current signals. Also, we discuss the longitudinal beam control performance and future plans.

MOPC131	Ions for LHC: Towards Completion of the Injector Chain	ion, proton, acceleration, controls	376
	D. Manglunki, M. Albert, M.-E. Angoletta, G. Arduini, P. Baudrenghien, G. Bellodi, P. Belochitskii, E. Benedetto, T. Bohl, C. Carli, E. Carlier, M. Chanel, H. Damerau, S. S. Gilardoni, S. Hancock, D. Jacquet, J. M. Jowett, V. Kain, D. Kuchler, M. Martini, S. Maury, E. Métral, L. Normann, G. Papotti, S. Pasinelli, M. Schokker, R. Scrivens, G. Tranquille, J. L. Vallet, B. Vandorpe, U. Wehrle, J. Wenninger CERN, Geneva
	The CERN LHC experimental programme includes heavy ion physics with collisions between two counter-rotating Pb⁸²⁺ ion beams at a momentum of 2.76 TeV/c/nucleon per beam and luminosities as high as 1·10²⁷ cm^-2 s^-1. To achieve the beam parameters required for this operation the ion accelerator chain has undergone substantial modifications. Commissioning with beam of the various elements of this chain started in 2005 and in 2007 it was the turn of the final stage, the Super-Proton-Synchrotron (SPS) following extensive changes to the low-level RF hardware. The major limitations of this mode of operation of the SPS (space charge, intra-beam scattering) are presented, together with the performance reached so far. The status of the pre-injector performance will also be reviewed together with a description of the steps required to reach nominal performance.

MOPC133	Radiation Level in the J-PARC Rapid Cycling Synchrotron after First Study	beam-losses, acceleration, proton, synchrotron	382
	K. Yamamoto, N. Hayashi, S. Hiroki, R. Saeki JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken K. Satoh, M. Tejima KEK, Ibaraki T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken
	The 3GeV RCS (Rapid-Cycling Synchrotron) in J-PARC has been commissioned in October of 2007. The most important issue in the beam study is to reduce unnecessary beam loss and to keep the beam line clean for the sake of maintenance and upgrade of the machines. In order to achieve this purpose, we observed the beam loss monitors located around the RCS beam line and observed them for beam commissioning. We also investigated the residual dose of accelerator components during an interval of beam study. From these results, we found that beam loss points were the injection junction point, the branch of H0 dump and extraction line, transverse collimators, and dispersion maximum points in the arcs. Especially, the entrance of the primary collimator chamber and the current transformer of the H0 dump line were the most radio-activated points in the RCS. To make the best use of these results for beam commissioning, we managed to minimize the beam losses and succeeded in suppressing the residual dose to a level low enough to allows us to work close to those components.

MOPC134	The Status of the J-PARC RF Systems	synchrotron, acceleration, linac, controls	385
	M. Yoshii, S. Anami, E. Ezura, K. Hara, C. Ohmori, A. Takagi, M. Toda KEK, Ibaraki K. Haga, K. Hasegawa, M. Nomura, A. Schnase, F. Tamura, M. Yamamoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
	The first acceleration of a proton beam at the J-PARC Rapid Cycling Synchrotron started in October 2007. The R&D for magnetic alloy (MA) loaded rf-systems to realize a high field gradient accelerating system for a rapid cycling machine has been initiated in 1996 with the aim of surpassing standard ferrite loaded cavities. The RCS RF system is broad-band and designed to cover both the RCS accelerating frequency range and the second harmonic for bunch shape manipulation. The optimum Q value of the RCS cavities is approximately 2. This is realized by combining a high-Q parallel inductor with an un-cut core configuration. The beam commissioning of the 50GeV Main Ring synchrotron will start in May 2008. Acceleration and slow-beam extraction are planned for December 2008. In case of the MR RF system, the accelerating frequency swing is small. The Q-value in the order of 20 has been selected to reduce transient beam loading due to the multiple-batch injection scheme. The MR RF cavities realize the Q-value by a cut-core configuration. The details of the RF systems and the results of beam accelerations are summarized.

MOPC135	Present Status and Future improvement of HIRFL-CSR	ion, target, heavy-ion, electron	388
	Y. J. Yuan, J. W. Xia, W.-L. Zhan, H. W. Zhao IMP, Lanzhou
	The HIRFL-CSR project is a national mega project of China, which concentrates on heavy ion synchrotron and cooling storage ring. It is finished recently. The present commissioning results, testing experiments are introduced in this paper. The future improvement of the machine is also shown.

MOPC140	Status of the Multipurpose Fully Superconducting ECR Ion Source	plasma, ion, diagnostics, extraction	400
	G. Ciavola, L. Celona, S. Gammino, F. Maimone, D. Mascali INFN/LNS, Catania H. A. Koivisto JYFL, Jyvaskyla R. Lang, J. Maeder, J. Rossbach, P. Spaedtke, K. Tinschert GSI, Darmstadt
	The MSECRIS source has been designed with the aim to exceed the highest currents of highly charged heavy ions available up to now. It is based on a minimum B trap made of a hexapole and three solenoids. The design magnetic field is 2.7 T for the hexapole and 4.5 T for the mirror field, in order to permit to operate not only at 28 GHz but also at higher frequency, thus increasing the plasma density and finally the beam current. Such high level of magnetic field is a challenge because of the forces arising on the superconducting coils and it largely exceeds the highest magnetic field available for existing ECRIS. A description of the source and of its preliminary results will be given. The source has been built in the frame of the European collaboration EURONS/JRA07-ISIBHI and it is now installed at the EIS testbench of GSI.

MOPD029	Commissioning of the 2,2 kW, 476 MHz Solid State RF Power Source for the LNLS Booster Synchrotron	booster, synchrotron, storage-ring, electron	511
	C. Pardine, R. H.A. Farias, P. F. Tavares LNLS, Campinas
	A 2.2 kW, 476 MHz unconditionally stable solid state RF amplifier for CW operation has been built, tested, and is being used since july 2007 at LNLS. The amplifier, designed and developed in collaboration with Synchrotron SOLEIL, is made of 9 modules, each one containing one push-pull 290 W MOSFET equipped with an internal circulator and RF load. Low cost, reliability, linearity and high efficiency are the main features we aimed for in this device, which was developed for the LNLS Booster Injector. In this paper, we present technical characteristics as well as test results of the system.

MOPD030	The LHC radiation monitoring system for the environment and safety: from design to operation	radiation, monitoring, controls, collider	514
	L. Scibile, D. Forkel-Wirth, H. G. Menzel, D. Perrin, G. Segura Millan, P. Vojtyla, M. Widorski CERN, Geneva
	The RAdiation Monitoring System for the Environment and Safety (RAMSES) has been installed and successfully commissioned. The system was originally designed for the Large Hadron Collider (LHC), it was extended to the CNGS and it is also planned to further extend it to the rest of the CERN accelerators. This state-of-the-art radiation monitoring and alarm system provides permanent ambient dose equivalent rates and ambient dose equivalent measurement in the underground areas as well as on the surface inside and outside the CERN perimeter; it permanently monitors air and water released from the LHC and CNGS installations; it also integrates some conventional environmental measurement such as physicochemical parameters of released water. This paper illustrates the experience gained during the various project phases outlining the problems encountered and the solutions implemented. In addition, it gives a first feedback on the operational experience gained with the CNGS.

MOPD038	First Radiation Monitoring Results During Elettra Booster Commissioning	radiation, booster, shielding, monitoring	535
	K. Casarin, E. Quai, S. Sbarra, G. Tromba, A. Vascotto ELETTRA, Basovizza, Trieste
	The new injection system for the Elettra storage ring is based on a 100 MeV linac and a booster synchrotron, where the electron energy can be raised up to 2.5 GeV. The new machine is designed to perform full energy injection, also in top-up mode. Outside the shielding, radiation monitoring is performed through a real-time network of gamma and neutron dosimeters as well as through TLD passive dosimeters. The radiation monitors placed next to the beamlines are interlocked with the machine operation and prevent injection into the storage ring if the alarm threshold is exceeded. This paper reports the first results of the radiation monitoring performed during the new injector commissioning.

MOPD039	The Personnel Safety System of the Elettra Booster	booster, storage-ring, controls, radiation	538
	K. Casarin, L. Battistello, S. Fontanini, F. Giacuzzo, M. Lonza, E. Quai, S. Sbarra, G. Tromba, A. Vascotto, L. Zambon ELETTRA, Basovizza, Trieste
	The new injector of the Elettra storage ring is based on a 100 MeV linac feeding a 3 Hz booster synchrotron. The booster is designed to accelerate the electron beam up to the maximum energy of 2.5 GeV, providing full-energy injection into the storage ring. The Personnel Safety System (PSS) of the new injector protects personnel from radiation hazards by controlling access to restricted areas and interrupting the machine operation in case unsafe conditions occur. The system is based on Programmable Logic Controller (PLC) technology providing redundant logic in a fail-safe configuration. This paper describes the radiation safety criteria that have been defined to minimize radiation exposure hazards as well as the technology and architecture chosen for the PSS implementation.

MOPP010	Experimental Studies on Drive Beam Generation in CTF3	linac, extraction, quadrupole, optics	571
	R. Corsini, S. Bettoni, S. Doebert, P. K. Skowronski, F. Tecker CERN, Geneva C. Biscari, A. Ghigo INFN/LNF, Frascati (Roma) Y.-C. Chao Jefferson Lab, Newport News, Virginia
	The objective of the CLIC Test Facility CTF3, built at CERN by an international collaboration, is to demonstrate the main feasibility issues of the CLIC two-beam technology by 2010. CTF3 consists of a 150 MeV electron linac followed by a 42 m long delay loop, an 84 m combiner ring and a two-beam test area. One key-issue studied in CTF3 is the efficient generation of a very high current drive beam, used in CLIC as the power source for the acceleration of the main beam to multi-TeV energies. The beam current is first doubled in the delay loop and then multiplied again by a factor four in the combiner ring by interleaving bunches using transverse deflecting RF cavities. The combiner ring and the connecting transfer line have been installed and put into operation in 2007. In this paper we give the status of the commissioning, illustrate the beam optics measurements, discuss the main issues and present the results of the combination tests.

MOPP011	Fast Vertical Beam Instability in the CTF3 Combiner Ring	linac, simulation, beam-losses, closed-orbit	574
	R. Corsini, D. Schulte, P. K. Skowronski, F. Tecker CERN, Geneva D. Alesini, C. Biscari, A. Ghigo INFN/LNF, Frascati (Roma)
	The CLIC Test Facility CTF3 is being built at CERN by an international collaboration, in order to demonstrate the main feasibility issues of the CLIC two-beam technology by 2010. The facility includes an 84 m combiner ring, which was installed and put into operation in 2007. High-current operation has shown a vertical beam break-up instability, leading to high beam losses over the four turns required for nominal operation of the CTF3 ring. Such instability is most likely due to the vertically polarized transverse mode in the RF deflectors used for beam injection and combination. In this paper we report the experimental data and compare them with simulations. Possible methods to eliminate the instability are also outlined.

MOPP025	Design of the Beam Extraction by Using Strip-line Kicker at KEK-ATF	kicker, septum, extraction, damping	601
	T. Naito, H. Hayano, K. Kubo, S. Kuroda, T. Okugi, N. Terunuma, J. Urakawa KEK, Ibaraki
	The developing work of the strip-line kicker system for International linear collider(ILC) is carrying out at KEK. To confirm the performance of the kicker system, the beam extraction test by using strip-line kicker is in progress at KEK-ATF. The multi-bunch beam, which has 2.8ns bunch spacing in the damping ring, is extracted from the damping ring to the extraction line with 308ns duration. The scheme is the same as the kicker of the ILC. The bump orbit and the auxiliary septum magnet will be used with the kicker to clear the geometrical restriction. The detail of the hardware design and the basic performance of each component are presented in this paper. T. Naito et al. Development of the Strip-line Kicker System for ILC Damping Ring, Proceedings of PAC07, Albuquerque, New Mexico, USA, pp2772-2274.

MOPP046	Collimation Optimizations, Capture Efficiency, and Primary-Beam Power Loss in the ILC Positron Source	positron, target, collimation, optics	649
	F. Zhou, Y. Nosochkov, J. Sheppard SLAC, Menlo Park, California W. Liu ANL, Argonne, Illinois
	The ILC positron beam generated from a thin Ti target has a wide energy spread and large transverse divergence. With the collection optics immediately downstream of the target and pre-acceleration to 125 MeV, the collected positron beam still has a long tail of positrons with low energies and large transverse divergence, which will be lost in the rest of the ILC positron source beamline. A collimation system is proposed and optimized for the case of a shielded target with quarter-wave transformation collection optics so that the power loss in the magnets and RF structures is effectively controlled within the acceptable level and in the damping ring (DR) within 640 W, assuming 3× 10¹⁰ of the captured positrons per bunch in the DR. In this case, the capture efficiency and DR injection efficiency are 13% and 99.8%, respectively. The lower capture efficiency is expected to result in higher injection efficiency and therefore, a lower power loss in the DR. The capture efficiency for the cases of a shielded target with flux concentrator and 5-T immersed target with flux concentrator is 20% and 30%, respectively, with the collimation system.

MOPP051	Effect of Fill Patterns on Extraction Jitter in Damping Rings	damping, simulation, extraction, coupling	664
	K. M. Hock, A. Wolski Cockcroft Institute, Warrington, Cheshire
	Injection of fresh bunches into a storage ring can induce jitter on stored bunches, as a result of wake field coupling. This transient effect can lead to an undesirable increase in the emittance of stored bunches; in the case of linear collider damping rings, there can also be jitter in the extracted bunches, which can adversely affect performance. We consider how the wake field coupling in a storage ring depends on the fill pattern, and, for the ILC damping rings, present the results of simulations of the transverse dynamics with a resistive wall wake field for a number of different fill patterns. We draw correlations between the extraction jitter and various machine parameters, including the fill pattern.

MOPP078	Femtosecond Photocathode Electron Source	laser, electron, emittance, gun	730
	J. Yang, K. Kan, T. Kondoh, K. Tanimura, Y. Yoshida ISIR, Osaka J. Urakawa KEK, Ibaraki
	A photocathode-based low-emittance femtosecond-bunch electron source is developed to reveal the hidden dynamics of intricate molecular and atomic processes in materials through experimentation such as time-resolved pulse radiolysis or time-resolved electron diffraction. The transverse and longitudinal dynamics of femtosecond electron beam in a photocathode rf gun were studied. The growths of the emittance, bunch length and energy spread due to the rf and the space charge effects in the rf gun were investigated by changing the laser injection phase, the laser pulse width and the bunch charge. The beam simulation indicates that a sub-100-fs MeV electron source with the normalized transverse emittance of 0.1 mm-mrad and the relative energy spread of 10^-4 at bunch charge of 0.1-1pC is achievable in the photocathode rf gun driven by a femtosecond laser light.

MOPP084	Installation and Commissioning of the RF System for the New Elettra Booster	booster, storage-ring, controls, radiation	745
	A. Fabris, M. Bocciai, L. Bortolossi, M. Ottobretti, C. Pasotti, M. Rinaldi ELETTRA, Basovizza, Trieste
	The commissioning of the new booster of the Elettra synchrotron radiation source started in Fall 2007. The RF system of the booster is made of a five cells accelerating cavity fed by a 60 kW 500 MHz power plant. The accelerating cavity voltage is ramped along with the booster energy at a 3 Hz repetition rate. The cavity field is controlled by analog feedback loops on amplitude, phase and the resonant frequency. This paper describes the setting into operation of the system and its performances during the commissioning phase of the machine.

MOPP087	RF System for the SSRF Booster Synchrotron	booster, synchrotron, extraction, electron	754
	Q. Gu, L. X. Chen, M. Chen, L. Feng, Z. Q. Feng, H. T. Hou, J. F. Liu, C. Luo, D. Q. Mao, F. Wang, Zh. G. Zhang, S. J. Zhao, Y. B. Zhao, Z. S. Zhou SINAP, Shanghai
	The booster synchrotron of the Shanghai Synchrotron Radiation Facility (SSRF) ramps the energy of electron beam from 150 MeV to 3.5 GeV with a repetition rate of 2 Hz. The guidelines of the system design are simplicity and reliability, and the ability of top-up injection for the storage ring is also taking into account. The RF system consists of a 180kW CW plant with a WR1800 waveguide line, two PETRA type 5-cell cavities and an analog low level RF electronics with vector-sum scheme. An overview, installation and commissioning of the whole booster RF system are presented in this paper. The performance of the RF system with the beam is also given.

MOPP102	High Field Gradient RF System for a Spiral FFAG, RACCAM	impedance, acceleration, extraction, vacuum	793
	C. Ohmori KEK, Ibaraki J. Fourrier, J. Pasternak LPSC, Grenoble F. Meot CEA, Gif-sur-Yvette
	A high field-gradient RF system for a spiral FFAG is described. It is wideband to cover the frequency of 3 to 7.5 MHz. The beam will be accelerated with a high repletion rate of 100 Hz to fit requirements for hadron therapy. The cavity has a wide aperture of 90 cm in horizontal direction to allow a large excursion for beam acceleration. It has less than 40 cm in length to fit a very short straight section.

MOPP152	Bunch Lengthening Harmonic System for NSLS-II	ion, impedance, damping, emittance	904
	J. Rose, N. A. Towne BNL, Upton, Long Island, New York
	NSLS-II is a new ultra-bright 3GeV 3rd generation synchrotron radiation light source. The performance goals require operation with a beam current of 500mA and a bunch current of at least 0.5mA. Ion clearing gaps are required to suppress ion effects on the beam. The natural bunch length of 3mm is planned to be lengthened by means of a third harmonic cavity in order to provide a margin for the Touschek limited lifetime and for instability threshold currents. The paper presents the analysis of the bunch lengthening in this dual RF system consisting of a 500MHz fundamental and 1500 MHz harmonic system in presence of strong transient beam loading. A conceptual design of a 1500MHz SCRF cavity is developed and design performance is discussed.

TUXG01	Last Year of PEP-II B-Factory Operation	luminosity, feedback, vacuum, controls	946
	J. Seeman SLAC, Menlo Park, California
	The PEP II B-Factory at SLAC has been in operation for a decade, delivering luminosity to the BABAR experiment. The design luminosity was successfully reached after one year of operation and since then it has surpassed over four times design at 1.2 x 10³⁴ cm^-2sec^-1. History of main achievements, high current operation issues, and lessons for the future factories will be presented.
	Slides

TUOAG01	VEPP-2000 Electron-Positron Collider Commissioning and First Results of Round Colliding Beam Tests	electron, vacuum, lattice, radiation	956
	Y. M. Shatunov, D. E. Berkaev, I. Koop, A. P. Lysenko, E. Perevedentsev, A. L. Romanov, P. Yu. Shatunov, D. B. Shwartz, A. N. Skrinsky BINP SB RAS, Novosibirsk
	VEPP-2000 electron-positron collider construction has been completed in the Budker INP at the beginning of 2007 year. First beam was captured in a special lattice without final focus solenoids. In this regime all systems of power supplies, machine control and beam diagnostics were calibrated and tuned. In the same mode vacuum chamber treatment by synchrotron radiation was performed with electron beam current up to 150 mA. The first test of the round beam option was performed at the energy of 508 MeV with the solenoidal field 10 T in two interaction straight sections. Studies of the beam-beam interaction have been done in "weak-strong" and "strong-strong" regimes. Measurements of beam sizes in the both cases have indicated a beam behavior similar to expectations for the round colliding beams.
	Slides

TUOAG02	Commissioning of BEPCII	luminosity, vacuum, optics, electron	959
	J. Q. Wang, L. Ma, C. Zhang IHEP Beijing, Beijing
	BEPCII is the upgrade project of Beijing Electron Positron Collider (BEPC), serving continuously for both high energy physics experiment and light soure use. As an e⁺-e^- collider, BEPCII will operate in the beam energy region of 1-2.1 GeV with design luminosity of 1*10³³cm^-2s^-1 at 1.89 GeV. The beam commissioning of BEPCII storage rings started out in Nov. 2006. From Nov. 2006 to Aug. 2007, the phase one commissioning was carried out successfully with the so called backup scheme adopting conventional magnets in the IR intead of the superconducting insertion magnets (SIM). After the SIM was intalled into the interaction region, phase two commissioning began in Oct. 2007. The tuning method for high luminosity but low background was extensively studied during phase two, and the beam current has reached more than 1/3 of the design of 0.91 A. The third phase of beam commissioning is planned in May this year after the detector is moved into the on-line position. It is expected that the luminosity would reach to about 30% of its design specification. This paper describes the procedure of beam commissioning of BEPCII and focuses on results of its second phase.
	Slides

TUOCG02	Status Report on the Centro Nazionale di Adroterapia Oncologica (CNAO)	synchrotron, ion, emittance, extraction	982
	M. Pullia CNAO Foundation, Milan
	The Centro Nazionale di Adroterapia Oncologica (National Center for Oncological Hadrontherapy, CNAO) is the Italian center for deep hadrontherapy. It will deliver treatments with active scanning both with proton and carbon ion beams. The accelerator complex is based on a 25 m diameter synchrotron capable of accelerating carbon ions up to 400 MeV/u and protons up to 250 MeV. Four treatment lines, in three treatment rooms, are foreseen in the first stage. In one of the three rooms a vertical and a horizontal fixed beam lines are provided, while in the other two rooms the treatment will be administered with horizontal beams only. The injection chain is positioned inside the synchrotron ring itself, to save space and to better exploit the two non-dispersive regions in the synchrotron. The injection chain is made by a 8 keV/u Low Energy Beam Transfer line (LEBT), a RFQ accelerating the beam to 400 keV/u, a LINAC to reach the injection energy of 7 MeV/u and a Medium Energy Beam Transfer line (MEBT) to transport the beam to the synchrotron. This report describes the design and the performances of the CNAO complex, and reports about the status of the commissioning of the machine.
	Slides

TUOAM01	Commissioning Status of the Shanghai Synchrotron Radiation Facility	storage-ring, booster, linac, feedback	998
	Z. T. Zhao, H. Ding, H. Xu SINAP, Shanghai
	The Shanghai Synchrotron Radiation Facility (SSRF), an intermediate energy storage ring based third generation light source, is under commissioning at a site in Shanghai Zhang-Jiang Hi-Tech Park. The ground breaking of this project was made on Dec.25, 2004, and on Dec.24, 2007 electron beam was stored and accumulated in the SSRF storage ring. Since then the accelerator commissioning and beamline installation have been being continued toward the scheduled user operation from May 2009. This paper presents an overview of the SSRF status and its machine commissioning progress.
	Slides

TUOBM01	Advanced Design of the FAIR Storage Ring Complex	antiproton, ion, storage-ring, electron	1004
	M. Steck, C. Dimopoulou, A. Dolinskii, O. E. Gorda, V. Gostishchev, K. Knie, S. A. Litvinov, I. Nesmiyan, F. Nolden, D. Obradors-Campos, C. Peschke GSI, Darmstadt
	The storage ring complex of the FAIR comprises three storage rings with a magnetic rigidity of 13 m. Each of the three rings, CR, RESR, and NESR, serves specific tasks in the preparation of secondary beams, rare isotopes and antiprotons, or for experiments with heavy ion beams. The CR is optimized for fast stochastic pre-cooling of secondary beams. The RESR design has been recently revised for optimum performance of antiproton accumulation. The concept for the installation of both rings in a common building is elaborated. The ion optical and engineering design of the NESR for experiments with heavy ions, the deceleration of ions or antiprotons for a subsequent low energy facility, and the accumulation of rare isotope beams is proceeding. A section for collision experiments with circulating ions and counter propagating electrons or antiprotons has been worked out. This report will give a summary of the various new concepts conceived in the process of the design of this new storage ring facility.
	Slides

TUOBM03	High-Intensity Polarized H^- (Proton), Deuteron and 3He++ Ion Source Development at BNL	polarization, ion, proton, rfq	1010
	A. Zelenski, J. G. Alessi, A. Kponou, D. Raparia BNL, Upton, Long Island, New York
	New techniques for production of polarized H^- (protons), deuteron and 3He++ ion beams (based on optical pumping polarization method) will be discussed. Feasibility studies of these techniques are in progress at BNL. The depolarization factors in the multi-step spin-transfer polarization technique and basic limitations on maximum polarization in the OPPIS (Optically-Pumped Polarized H^- Ion Source) will be discussed. Detailed studies of polarization losses in the RHIC OPPIS and the source parameters optimization resulted in the OPPIS polarization increase to 86-90%. This contributed to AGS and RHIC polarization increase to 65-70%.
	Slides

TUOBM04	FFAGs for the ERIT and ADS Projects at KURRI	proton, target, booster, storage-ring	1013
	T. Uesugi, H. Horii, Y. Kuriyama, K. Mishima, Y. Mori, A. Osanai, T. Planche, S. Shiroya, M. Tanigaki, H. Yoshino KURRI, Osaka M. Inoue SLLS, Shiga Y. Ishi Mitsubishi Electric Corp, Energy & Public Infrastructure Systems Center, Kobe M. Muto FFAG DDS Research Organization, Tokyo K. Okabe, I. Sakai University of Fukui, Faculty of Engineering, Fului
	A chain of FFAG proton accelerator have been under construction at Kyoto University Research Reactor Institute (KURRI), Osaka, for the study of accelerator driven system (ADS) since 2004. The accelerator is a cascade type and composed of three different FFAG rings: injector, booster and main ring. The maximum energy of the main ring is 150 MeV for proton. The beam was successfully accelerated and extracted from the booster in June of 2006 and the beam commissioning of the main ring has started since then. Recently the beam has been successfully injected into the main ring.
	Slides

TUZM01	Recent Development of Diagnostics on 3rd Generation Light Sources	emittance, diagnostics, feedback, electron	1016
	G. Rehm Diamond, Oxfordshire
	A Review of the most performing diagnostics on 3rd generation light sources will be given. Starting with the target performance specification of recent 3rd generation light sources, the demands for diagnostics will be highlighted. Topics include beam position monitors and their integration, emittance measurement by imaging of the stored beam or interference methods and diagnostic requirements for top-up operation. A survey on recent developments and the achieved performances at different accelerators will be presented.
	Slides

TUOCM03	Beam Loss Position Monitoring with Optical Fibres at DELTA	radiation, beam-losses, storage-ring, vacuum	1032
	F. Rüdiger, G. Schmidt, K. Wille DELTA, Dortmund W. Goettmann HMI, Berlin M. Koerfer DESY, Hamburg
	Detection of ionising radiation with optical fibres is used to localize beam losses. At DELTA three different systems are in use. Optical Time Domain Reflectometry (OTDR) is used to measure radiation doses along the full length of the storage ring vacuum chamber. Transmission measurement of optical fibre loops is used for surveillance of radiation sensitive objects like Undulator permanent magnets. Integration into the DELTA control system offers the possibility to react on increased doses within several minutes. Detection of Cerenkov radiation offers real-time beam loss position monitoring with single-bunch resolution of 2 ns. With up to four fibres mounted at different positions along the vacuum chamber spatial measurement of beam loss is used to increase injection efficiency.
	Slides

TUPC013	A Compact and Versatile Diagnostic Tool for CNAO Injection Line	ion, emittance, diagnostics, proton	1071
	J. Bosser, G. Balbinot, S. Bini, M. Caldara, V. Chimenti, L. Lanzavecchia, A. Parravicini CNAO Foundation, Milan A. Clozza, V. Lollo INFN/LNF, Frascati (Roma)
	CNAO, the first Italian center for deep hadrontherapy, is presently in its final step of construction. It will provide treatments with active scanning both with proton and carbon ion beams. Commissioning of the injection lines will be started by the time of the presentation of this report. CNAO beams are generated by two ECR sources, which are both able to produce both particle species. The beam energy in the Low Energy Beam Transfer (LEBT) line is 8 keV/u. A compact and versatile tank has been designed that contains a complete set of diagnostic tools. It is only 390mm long; it houses two horizontal and two vertical plates to suppress beam halo, measure emittance and eventually to limit beam size. It also comprises two wire scanners, for vertical and horizontal beam transverse profile, as well as a Faraday Cup for current measurement. Synchronous profile and intensity measurements and phase space distribution reconstruction can be performed with one tank monitors. Five identical tanks are installed in the LEBT, as consequence of a standardization strategy to facilitate monitoring and make maintenance easier. Expected performances and preliminary beam measurements are presented.

TUPC034	Beam Instrumentations for the J-PARC RCS Commissioning	proton, linac, synchrotron, diagnostics	1125
	N. Hayashi, S. Hiroki, R. Saeki, K. Satou, R. Toyokawa, K. Yamamoto, M. Yoshimoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken D. A. Arakawa, S. Hiramatsu, M. Tejima KEK, Ibaraki S. Lee, T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken
	A 3-GeV Rapid-Cycling Synchrotron (RCS) of the Japan Proton Accelerator Research Complex (J-PARC) has been commissioned recently. During its beam commissioning, various beam diagnostic instrumentation has been used. The multi-wire profile monitor (MWPM) is used to establish injection and H0 dump line, which transports un-stripped H^- or H0 beam to the dump. The electron catcher confirms that the beam hits a charge exchange carbon foil and the specified current monitor limits the beam current to the H0 dump. Single pass BPMs which detect linac frequency (324MHz) and ionization profile monitors (IPM) help to check the one pass orbit without circulation of the beam. The beam position monitor (BPM) can measure both COD and turn-by-turn position. Tune monitor system consists of exciter and its own BPM. The exciter shakes the beam and coherent oscillation is measured at BPM. Dedicated BPMs, Fast CT (FCT) and Wall Current Monitor (WCM) are used for RF feedback or feedforward control. It will describe the performance of each instruments and how they are contributed to the successful beam commissioning.

TUPC035	The Beam Position Monitor System of the J-PARC RCS	controls, linac, pick-up, vacuum	1128
	N. Hayashi, S. Hiroki, R. Saeki, K. Satou, R. Toyokawa, K. Yamamoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken D. A. Arakawa, S. Hiramatsu, M. Tejima KEK, Ibaraki S. Lee, T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken
	The Beam Position Monitor (BPM) system of the J-PARC RCS has been fabricated, installed and operated successfully during the beam commissioning. There are 54 BPMs around the ring and most of them are placed inside steering magnets. The BPM is electro static type and it has four electrodes. A pair of electrode gives a linear response with diagonal cut shape and they were calibrated before their installation. The signal processing unit, which is equipped with 14-bit 14MSPS ADC and 600MHz DSP, has been developed for the system. In order to measure small signal, especially during the initial phase of the commissioning, careful design also done for cabling. The paper presents the current performance of the system.

TUPC036	Multi-wire Profile Monitor for J-PARC 3GeV RCS	electron, linac, radiation, superconductivity	1131
	S. Hiroki, N. Hayashi, M. Kawase, F. Noda, P. K. Saha, H. Sako, H. Takahashi, A. Ueno JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken Y. Arakida, S. Lee, T. Toyama KEK, Ibaraki
	A set of six multi-wire profile monitors (MWPMs) has been installed in the injection line and the successive H0 dump line of the RCS (Rapid-Cycling Synchrotron), and contributed to the initial RCS commissioning for establishing an optimum injection orbit. The Au coated W wires (0.1 mm dia.) for the H^- beam detection are fixed to a ceramic wind frame for two directions (horizontal and vertical with 17.7 ^o tilt, typically 51 wires with 2.9 mm or 9.5 mm distance), and the frame can be scanned for horizontal or vertical direction by using a stepping-motor driven actuator. A combination of the 17.7 ^o tilt wires and the precise scan function provides two step measurements, i.e. a rough profile is obtained only at one shot, and a detailed profile is measured for typically 101 shots (10 mm scan at 0.1 mm interval) thereafter. The beam induced charge signals are amplified by the instrumentation pre-amps located in a basement sub-tunnel at distances of 30-40 m from the frame through the shielded twisted pair cables. The signals are further transferred to the sample, hold and multiplex circuits at the ground floor. The digitized profile data are processed to the Gaussian fitting.

TUPC038	Filling Pattern Measurement for the Taiwan Light Source	photon, synchrotron, controls, storage-ring	1137
	C. Y. Wu, J. Chen, K. T. Hsu, K. H. Hu, C. H. Kuo NSRRC, Hsinchu
	Filling pattern will affect various operation performance of a synchrotron light source. Measurement of the filling pattern correctly is important. The dedicated filling pattern measurement system has been implemented in 2004 for multi-bunch operation in top-up operation mode. Measurement the purity of an isolated bunch by using time correlated single photon counting method is also addressed. Results are presented in this report.

TUPC050	A Complete Solution for Beam Loss Monitoring	beam-losses, monitoring, controls, vacuum	1170
	M. Kobal, J. Dedic, R. Stefanic Cosylab, Ljubljana J. F. Bergoz BERGOZ Instrumentation, Saint Genis Pouilly
	In particle accelerator facilities knowing the beam loss is crucial for the machine to be running at optimal efficiency. Beam loss can be monitored on different time scales. Time scale of seconds is used at normal operation to detect any irregularities such as changes in the beta function or vacuum drop. Time scale of 1 ms is used to optimize injection, and 1 μs timescale in case of severe problems when the beam does not live for more than a couple of turns. The presented beam loss system (microIOC-BLM) uses Bergoz BLM sensors, Beam loss Signal Conditioner (BSC) for data acquisition and microIOC-CosyIcon as the central processing unit. The system is cost effective, portable and can be expanded with additional measuring points. Selectable counting interval from 100 μs to 10 s covers a large part of the required time scales. The minimum and maximum count rates are limited by the sensor between 1/s to 10 M./s. Trigger and gate signals are supported as is summing over a number of measurements.

TUPC092	An Application for Beam Profile Reconstruction with Multi-wire Profile Monitors at J-PARC RCS	linac, controls, beam-transport, synchrotron	1272
	H. Sako, S. Hiroki, K. Yamamoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken H. Ikeda Visual Information Center, Inc., Ibaraki-ken H. Takahashi JAEA, Ibaraki-ken
	J-PARC RCS is commissioned since October 2007. In the early stage of RCS commissioning, Multi-Wire Profile Monitors (MWPM's) are most important beam monitors to measure positions and profiles of beam orbit in the injection line from LINAC. A MWPM consists of either a horizontal or a vertical wire plane. Each wire plane consists of several wires which has a tilt angle, and a wire scatters H^- or proton beams and induced current in the wire is detected. A wire plane moves at a small step in the perpendicular direction to the wires and scans a beam profile. A complex analysis procedure and geometrical description is developed to reconstruct a beam profile from a MWPM. Beam profiles have been measured at MWPM's in the injection line and the H0 beam dump line.

TUPC096	Development of Beam Loss Monitor for the SPring-8 Storage Ring	beam-losses, electron, target, background	1284
	Y. Shimosaki, K. Kobayashi, M. Oishi, M. Shoji, K. Soutome, Y. Taniuchi JASRI/SPring-8, Hyogo-ken
	A beam loss monitor using PIN photodiodes has been developed. To check its performance, we installed it at an in-vacuum insertion device and at the injection section in the SPring-8 storage ring. Information on the beam loss at these points will be useful for examining demagnetization of permanent magnets of insertion devices and for studying a mechanism of beam loss. A noise level at these points is however high due to stray synchrotron radiation, an induction voltage generated by pulsed injection magnets, etc. The beam loss signal is then picked up under a high noise condition. Experimental results with its countermeasure will be reported.

TUPC103	Digital Generation of Noise-signals with Arbitrary Constant or Time-varying Spectra	simulation, emittance, synchrotron, target	1299
	J. Tuckmantel CERN, Geneva
	Noise sources in the RF system of an accelerator produce longitudinal emittance increase or loss. This noise is inherent, from the beam-control system electronics, external sources or high power components, or can be purposely injected for a specific need such as bunch distribution modification or controlled emittance increase. Simulations to study these effects on the beam require precise reproduction either of the total noise measured on the hardware, or of the noise spectrum to be injected and optimized to produce the desired changes. In the latter case the 'optimized' noise source has also to be created in real-time to actually excite the beam via the RF system. This paper describes a new algorithm to create noise spectra of arbitrary spectral density varying with cycle time. It has very good statistical properties and effectively infinite period length, important for long simulation runs. It is spectrally clean and avoids undesired mirror spectra. Coded in C++, it is flexible and fast. Used extensively in simulations it has also successfully created controlled emittance increase in the SPS by the injection of artificial real-time RF noise.

TUPC129	LHC Access System: from Design to Operation	controls, radiation, monitoring, site	1371
	T. Pettersson, C. Delamare, S. Di Luca, S. Grau, T. Hakulinen, L. Hammouti, F. Havart, J.-F. Juget, T. Ladzinski, M. Munoz Codoceo, P. Ninin, R. Nunes CERN, Geneva
	The paper describes the LHC access control and safety system project, the system's architecture and the experience gathered of commissioning it. This system is made of two parts: the LHC Access Control System and the LHC Access Safety System. Using state of the art redundant, fail-safe PLC's and a supplementary, cabled control loop the LHC Access Safety System guarantees the safety of the personnel in all events. Using industrial components, the LHC Access Control System, regulates the access to the tunnels and experimental areas by identifying the users and checking their authorisations. It allows a remote or automatic operation of the access control equipment and restricts the number of users working simultaneously in the interlocked areas. A first implementation of the architecture is now in production and ensures that only authorized personnel can enter the controlled areas of the LHC complex and this only after permission has been given by the CERN Control Centre. The design, procurement and installation of the entire system took more than 4 years and the commissioning phase lasted about 12 months.

TUPC147	Analogue LLRF for the ALBA Booster	booster, controls, synchrotron, resonance	1416
	H. Hassanzadegan, F. Pérez ALBA, Bellaterra
	ALBA Booster will inject up to 2 mA of current, at 3 Hz, in the 3 GeV 3rd generation Synchrotron Light Source ALBA, that is in the construction phase in Cerdanyola, Spain. The Booster will ramp the beam energy from 100 MeV to 3 GeV, the RF voltage will be ramped as well from <100 kV to 1 MV to improve injection efficiency and maintain the beam stable. The Booster RF System will have to provide up to 1 MV of accelerating voltage and have a high dynamic range. An Analogue LLRF prototype has been developed for the Booster 5 cell RF Cavity. The prototype is based on the IQ modulation/demodulation technique and it has been designed completely in house. The prototype has been installed in the high power RF lab of CELLS and tested to control up to 80 kW on the real Booster Cavity. The test results of the control loops (amplitude, phase and tuning) will be presented, as well as the hardware structure and the system interface.

TUPD002	Development of an Eddy Current Septum for LINAC4	septum, simulation, linac, extraction	1434
	M. J. Barnes, B. Balhan, J. Borburgh, T. Fowler, B. Goddard, W. J.M. Weterings CERN, Geneva A. Ueda KEK, Ibaraki
	The bump for the new PS Booster injection from the future Linac4 will be made up of a set of four pulsed dipole magnets; the first of these (BS1) must act as a septum with a thin element dividing the high-field region of the circulating beam from the field-free region through which the injected H^- beam must pass. BS1 will provide a deflection of 66 mrad at 160 MeV; this will be achieved with a peak field of 630 mT and a length of 200 mm. The field must rise and fall in 40 microseconds and have a flattop of up to 120 microseconds. The ripple of the flattop should be below ±1%. This paper discusses the design of an eddy current septum for BS1.

TUPD006	The Injection and Extraction Kicker Circuits for the Elettra Booster	kicker, extraction, booster, storage-ring	1443
	R. Fabris, P. Tosolini ELETTRA, Basovizza, Trieste
	The design, realization and performance of the power circuits for the Booster injection and extraction Kicker magnets are presented. Both circuits have been designed and developed with the goal to achieve reliable working conditions, simple maintenance and fast recovery time in case of failures. The circuits are designed around the same switching unit already adopted in the Kicker system of the Storage Ring injection; this allows storing common spare parts for both circuits and for the Storage Ring Kicker system as well. Beside the analytical analysis, a parametric study of the circuit, with the Microsim PSPICE software package, allowed to optimize the performance of the circuit regarding the parameters which were considered critical for the Booster injection and extraction processes, i. e. the current pulse rise time and fall time.

TUPD007	The Design and Fabrication of the Kicker Power Supply for TPS Project	kicker, storage-ring, power-supply, photon	1446
	C.-S. Fann, K. T. Hsu, S. Y. Hsu, K.-K. Lin, K.-B. Liu, Y.-C. Liu, C. Y. Wu NSRRC, Hsinchu
	The preliminary test results of the kicker power supply for TPS (Taiwan Photon Source) project will be presented in this report. The achieved capability of this test unit demonstrates that it fulfills the design requirement of providing half-sine pulsed current of 2.5 kA (peak), 5.2 s (base-width), with jitter < 1 ns (peak-to-peak). Both units of using thyratron and IGBT switches are built with the same requirements. The technical considerations of both units for this particular application will be discussed.

TUPD034	Review of the Mechanical Engineering Challenges Associated with the SNS Power Ramp Up	vacuum, diagnostics, ion-source, ion	1500
	G. R. Murdoch, D. W. Crisp, M. Holding, P. Ladd, K. G. Potter, R. T. Roseberry ORNL, Oak Ridge, Tennessee
	Since commissioning of the SNS in April 2006 the beam power has been steadily increasing towards the design intensity of 1.4 MW. Several areas of the accelerator have been shown to require modifications, upgrades or new designs of mechanical equipment to support the power ramp schedule. This paper presents mechanical engineering design work implemented since initial commissioning along with a review of current projects and discussion of mechanical engineering issues being addressed that are a direct result of design decisions made early in the project.

TUPP009	Implementation and Operation of the Elettra Booster Control System	controls, booster, linac, power-supply	1544
	M. Lonza, F. Asnicar, L. Battistello, S. Fontanini, V. Forchi', G. Gaio, F. Giacuzzo, E. Mariotti, R. Marizza, R. Passuello, L. Pivetta, C. Scafuri, G. Scalamera, G. Strangolino, D. Vittor, L. Zambon ELETTRA, Basovizza, Trieste
	A new injector based on a 100 MeV linac and a 2.5 GeV booster synchrotron has been built and commissioned at Elettra to provide full energy and top up injection into the storage ring. The booster replaces the 1.2 GeV linac that will be used for the new 4th generation light source FERMI@Elettra currently under construction at Elettra. A new architecture has been adopted for the booster control system based on the Tango control system software. The implementation of the control system and the tools developed to meet an aggressive commissioning time schedule are presented. The experience gained during the operation of the booster is also discussed.

TUPP042	Status of the ORBIT Code: Recent Developments and Plans	scattering, acceleration, collimation, synchrotron	1637
	J. A. Holmes, S. M. Cousineau, A. P. Shishlo ORNL, Oak Ridge, Tennessee
	We report on recent enhancements to the physics modules of the ORBIT Code and on progress toward a new implementation of ORBIT using python. We have developed the capability to track particles through general three dimensional electromagnetic field configurations. This facility has proved essential in modeling beam transport through the complicated magnetic field regions of the SNS injection chicane and injection dump line, where beam losses are high. We have also enhanced the acceleration module to provide more flexibility for synchrotron calculations. Finally, progress continues on the migration of the ORBIT physics models to a python user environment, and we present the status of this work.

TUPP065	Experimental Study of the Electron Cloud Instability in the CERN-SPS	emittance, electron, simulation, proton	1688
	G. Rumolo, G. Arduini, E. Benedetto, E. Métral, G. Papotti, E. N. Shaposhnikova CERN, Geneva R. Calaga BNL, Upton, Long Island, New York B. Salvant EPFL, Lausanne
	The electron cloud instability limits the performance of many existing proton and positron rings. A simulation study carried out with the HEADTAIL code revealed that the threshold for its onset decreases with increasing beam energy, if the 6D emittance of the bunch is kept constant and the longitudinal matching to the bucket is preserved. Experiments have been carried out at the CERN-SPS to study the dependence of the vertical electron cloud instability on the energy and on the beam size. The reduction of the physical transverse emittance as a function of energy is considered in fact to be the main reason for the unusual dependence of this instability on energy.

TUPP067	Transverse Mode-coupling Instability in the CERN SPS: Comparing MOSES Analytical Calculations and HEADTAIL Simulations with Experiments in the SPS	simulation, impedance, kicker, coupling	1694
	B. Salvant EPFL, Lausanne G. Arduini, E. Métral, G. Papotti, G. Rumolo, R. J. Steinhagen, R. Tomas CERN, Geneva R. Calaga BNL, Upton, Long Island, New York
	Since 2003, single bunches of protons with high intensity (1.2·10¹¹ protons) and low longitudinal emittance (0.2 eVs) have been observed to suffer from heavy losses in less than one synchrotron period after injection at 26 GeV/c in the CERN Super Proton Synchrotron (SPS) when the vertical chromaticity is corrected. Understanding the mechanisms underlying this instability is crucial to assess the feasibility of an anticipated upgrade of the SPS, which requires bunches of 4·10¹¹ protons. Analytical calculations from MOSES and macroparticle tracking simulations using HEADTAIL with an SPS transverse impedance modelled as a broadband resonator had already qualitatively and quantitatively agreed in predicting the intensity threshold of a fast instability. A sensitive frequency analysis of the HEADTAIL simulations output was then done using SUSSIX, and brought to light the fine structure of the mode spectrum of the bunch coherent motion. A coupling between the azimuthal modes -2 and -3 was clearly observed to be the reason for this fast instability. The aim of the present paper is to compare the HEADTAIL simulations with dedicated measurements performed in the SPS in 2007.

TUPP081	Longitudinal Wakefields and Impedance in the CSNS/RCS	impedance, extraction, kicker, vacuum	1718
	N. Wang, Q. Qin IHEP Beijing, Beijing
	With the more general expressions developed for the wakefield generated by nonrelativistic beam, the impedances of some main vacuum parts of the Rapid Cycling Synchrotron (RCS) of the China Spallation Neutron Source (CSNS) are calculated and compared with the relativistic case. An impedance model is then proposed for the ring. With this impedance model, beam instabilities in the CSNS/RCS are investigated. N. Wang and Q. Qin, Phys. Rev. ST Accel. Beams 10, 111003 (2007)

TUPP091	WISE: a Simulation of the LHC Optics Including Magnet Geometrical Data	alignment, simulation, optics, lattice	1744
	P. Hagen, M. Giovannozzi, J.-P. Koutchouk, T. Risselada, F. Schmidt, E. Todesco, E. Y. Wildner CERN, Geneva
	The beam dynamics in LHC strongly depends on the field quality and geometry of the magnets. A model of the LHC optics has been built, based on the information available at the end of the production as well as on statistical evaluations for the missing information The pre-processor WISE generates instances of the LHC field errors for the MAD X program, with the possibility of selecting various sources. This paper describes the progress since WISE was presented in EPAC06. The slot allocation in LHC is completed since all magnets are installed and interconnected. Geometric measurements have been added for all magnets. Furthermore, some statistical data is available relative to the precision of magnet installation (alignment) and tunnel movements. In this paper the code and the data are used to update the beta-beating estimate at injection and collision energy. The relevance of misalignments of the different magnets and their impact on beta-beating is compared to the sources that have been previously considered, i.e. the spread in the gradient of the cell quadrupoles and the uncertainty associated to the knowledge of the transfer functions of the stand-alone quadrupoles.

TUPP115	Variable Energy Protontherapy FFAG Accelerator	extraction, septum, kicker, proton	1791
	J. Fourrier, J. Pasternak LPSC, Grenoble M. Conjat, J. Mandrillon, P. Mandrillon AIMA, Nice F. Meot CEA, Gif-sur-Yvette
	A hadrontherapy accelerator assembly based on an FFAG ring and a variable energy H^- cyclotron injector has been designed in the frame of the RACCAM project. The FFAG ring allows 2.1 Tm top rigidity, corresponding to 180 MeV proton top energy and 21.6 cm penetration depth and to 50 MeV per nucleon for carbon ions suitable for biological R&D). Variable energy extraction, bunch to pixel 3D scanning and multiport beam delivery are proposed in this installation. A prototype of a spiral sector scaling type of FFAG dipole is being built for proving the feasibility of the FFAG ring, subject to a second contribution in the conference. This paper will describe the accelerator assembly parameters and the beam properties.

TUPP126	Advanced Concepts for Particle-therapy Accelerators	ion, proton, linac, rfq	1821
	Th. Strodl ATI, Wien J. Murin, M. Pavlovic, R. Seemann STU, Bratislava
	Presently in Europe the first generation of particle-therapy accelerators is on the way from construction into operation. Each layout typically consists of two ion sources, a single injection line, a main synchrotron and beam transfer lines to several treatment rooms, one of them equipped with or foreseen for an ion gantry. The paper presents some possible enhancements for the next facility generation still based on existing layouts and design studies. The focus lies on an improved injection line and gantry concepts. A simplified injection line using a different configuration of ion sources and low-energy beam-transport line is described. It is based on combination of particle species with identical charge-to-mass ratio. Optimized gantry constructions are shown with mechanical designs driven by ion-optical demands, especially by the accuracy of the beam position at the isocentre. The enhancements presented in the paper may influence upgrades of existing centres or may be implemented in the design of newly developed next generation of particle- therapy accelerators.

TUPP150	The Radiatron: A High Average Current Betatron for Industrial and Security Applications	betatron, acceleration, focusing, electron	1860
	S. Boucher, R. B. Agustsson, P. Frigola, A. Y. Murokh, M. Ruelas RadiaBeam, Los Angeles F. H. O'Shea, J. B. Rosenzweig, G. Travish UCLA, Los Angeles, California
	The fixed-field alternating-gradient (FFAG) betatron has emerged as a viable alternative to RF linacs as a source of high-energy radiation for industrial and security applications. For industrial applications, high average currents at modest relativistic electron beam energies, typically in the 5 to 10 MeV range, are desired for medical product sterilization, food irradiation and materials processing. For security applications, high power x-rays in the 3 to 20 MeV range are needed for rapid screening of cargo containers and vehicles. In a FFAG betatron, high-power output is possible due to high duty factor and fast acceleration cycle: electrons are injected and accelerated in a quasi-CW mode while being confined and focused in the fixed-field alternating-gradient lattice. The beam is accelerated via magnetic induction from a betatron core made with modern low-loss magnetic materials. Here we present the design and status of a prototype FFAG betatron, called the RadiaTron, as well as future prospects for these machines.

WEXG02	Crabbed Waist Collisions in DAΦNE and Super-B Design	luminosity, collider, emittance, interaction-region	1898
	P. Raimondi, D. Alesini, M. E. Biagini, C. Biscari, R. Boni, M. Boscolo, F. Bossi, B. Buonomo, A. Clozza, G. O. Delle Monache, T. Demma, E. Di Pasquale, G. Di Pirro, A. Drago, A. Gallo, A. Ghigo, S. Guiducci, C. Ligi, F. Marcellini, G. Mazzitelli, C. Milardi, F. Murtas, L. Pellegrino, M. A. Preger, L. Quintieri, R. Ricci, U. Rotundo, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, S. Tomassini, C. Vaccarezza, M. Zobov INFN/LNF, Frascati (Roma) N. Arnaud, D. Breton, P. Roudeau, A. Stocchi, V. Variola, B. F. Viaud LAL, Orsay S. Bettoni CERN, Geneva P. Branchini roma3, Rome M. Esposito Rome University La Sapienza, Roma I. Koop, E. B. Levichev, P. A. Piminov, D. N. Shatilov, V. V. Smaluk BINP SB RAS, Novosibirsk K. Ohmi KEK, Ibaraki E. Paoloni University of Pisa and INFN, Pisa M. Schioppa INFN Gruppo di Cosenza, Arcavacata di Rende (Cosenza) D. Teytelman SLAC, Menlo Park, California P. Valente INFN-Roma, Roma
	The new idea of increasing the luminosity of a collider with crabbed waist collisions and first experimental results from DAΦNE using this concept are presented. Consequences for the design of future factories will be discussed. An outlook to the performance reach with crabbed waist collisions is given, with emphasis on future B Factories.
	Slides

WEZG01	Protection Controls for High Power Accelerators	controls, kicker, diagnostics, target	1921
	J. Wenninger CERN, Geneva
	The next generation hadron accelerators will operate with MW beams or store beams with an energy of many 100 MJ. Machine protection will constrain operation, but some operational flexibility is still required for commissioning and performance optimization. This is a substantial challenge for control systems and application programs. New tools are developed to face those challenges: critical settings management, software interlocks, role based access to equipment, automatic accelerator mode recognition etc. This talk presents some of the challenges and tools. Experience with novel approaches are discussed.
	Slides

WEOBM04	LHC: The World's Largest Vacuum Systems being Commissioned at CERN	vacuum, ion, cryogenics, cathode	1959
	J. M. Jimenez CERN, Geneva
	When it switches on in the spring of 2008, the 26.7 km Large Hadron Collider (LHC) at CERN, will have the world's largest vacuum system operating over a wide range of pressures and employing an impressive array of vacuum technologies. This system is composed by 54 km of UHV vacuum for the circulating beams and 24 km of insulation vacuum around the cryogenic magnets operated mainly at 1.9 K. Over the 54 km of UHV beam vacuum, 48 km of this must be at cryogenic temperature (1.9 K). The remaining 6 km of beam vacuum containing the insertions is at ambient temperature and uses non-evaporable getter (NEG) coatings – a vacuum technology that was born and industrialized at CERN. The pumping is completed using 600 ion pumps to remove noble gases and 1000 gauges are used to monitor the pressures. The cryogenic insulation vacuum, while technically less demanding, is impressive by its size - 24 km in length, 900 mm in diameter for a total volume of 640 m³. Once cooled at 1.9 K, the cryogenic pumping allows reaching pressure in the 10^-6 mbar range. This paper described the entire vacuum system and the challenges of the design, manufacturing, installation and commissioning phases.
	Slides

WEPC005	Design Considerations of the TPS Linac-to-booster Transfer Line	booster, linac, kicker, septum	1989
	H.-P. Chang, H. C. Chao, K. T. Hsu, S. Y. Hsu, D.-G. Huang, C.-C. Kuo, K.-K. Lin, W. T. Liu, Y.-C. Liu NSRRC, Hsinchu
	Design considerations of the linac to booster (LTB) transfer line for Taiwan Photon Source (TPS) project is described in this report. Electron beam from the linac with 150 MeV, 50 π-mm-mrad normalized emittance and 0.5% energy spread will be transferred to a booster synchrotron of 489.6 m. This LTB transfer line is designed with the flexible tuning capability and the diagnostics are included. Matching of transverse beam parameters from linac to booster is deliberated. The on-axis injection scheme with repetition rate around 2 or 3 Hz and efficiency with beta-mismatch for top-up operation is also studied.

WEPC012	Commissioning and Operation of the Metrology Light Source (MLS)	accumulation, ion, electron, storage-ring	2010
	J. Feikes, M. Abo-Bakr, K. B. Buerkmann-Gehrlein, M. V. Hartrott, J. Rahn, G. Wuestefeld BESSY GmbH, Berlin R. Klein, G. Ulm PTB, Berlin
	The Metrology Light Source (MLS) is dedicated to metrological and technological developments in the UV and EUV spectral range and in the IR and THz region. The new electron storage ring of the Physikalisch-Technische Bundesanstalt (PTB) is located next to the BESSY II storage ring in Berlin - Adlershof. The MLS with its 48 m circumference can be operated at any electron beam energy between 105 MeV and 630 MeV. The electron beam currents vary from 1 pA (one stored electron) up to 200 mA. These specific modes of operation were achieved during the initial one year phase of the commissioning of the storage ring until April 2008, when the regular MLS user operation started. The basis for this success was the previously commissioned microtron which is the main part of the injection system.

WEPC024	Low Beta Structure for the ANKA Storage Ring	optics, dynamic-aperture, emittance, vacuum	2034
	E. Huttel, I. Birkel, A.-S. Müller, P. Wesolowski FZK, Karlsruhe
	The ANKA storage ring has a fourfold symmetry with a double DBA structure. Four (~1.7 m) straight sections are used for the RF and the injection. Four sections (~ 4.5 m) are used for insertion devices (three installed). The beta functions in these sections are 14, respectively 7 m (horizontal/vertical). This is not ideal for small gap (7 mm) insertion devices. Reducing the vertical beta function to 2 m is possible with the present magnet configuration and is done for special user operation. Reducing both the horizontal and vertical beta function is favoured for one future beam line. This will afford a change of the present magnet configuration. Different options have been calculated and will be discussed.

WEPC028	Status of UVSOR-II and Light Source Developments	undulator, laser, electron, radiation	2046
	M. Katoh, M. Adachi, K. Hayashi, M. Shimada, J. Yamazaki UVSOR, Okazaki M. Hosaka, Y. Takashima, N. Yamamoto Nagoya University, Nagoya A. Mochihashi JASRI/SPring-8, Hyogo-ken
	UVSOR, a 750 MeV synchrotron light source of 53m circumference had been operated for more than 20 years. After a major upgrade in 2003, this machine was renamed to be UVSOR-II. The ring is now routinely operated with low emittance of 27 nm-rad and with four undulators. Top up injection is under preparation. The ring is equipped with a resonator type free electron laser. The shortest wave length has reached 200nm. Several user experiments in the deep UV region are in progress. Coherent terahertz synchrotron radiation and coherent harmonic generation are extensively studied by using an ultra-short laser system, under international collaborations. An upgrade plan of the ring is under consideration to improve the experimental setup of the light source developments.

WEPC030	Diamond Light Source: Moving from Commissioning to Full Machine Operation	storage-ring, feedback, single-bunch, controls	2052
	V. C. Kempson Diamond, Oxfordshire
	Diamond Light Source commenced routine operations in January 2007 providing light to beam lines for 3000 hours in 2007 with 4000 hours planned during 2008. During shut down periods Insertion Devices and photon Beam Lines, to utilise them, are being installed at a rate of four per year. The evolution of the performance of the machine during this period is described, including beam current, vacuum levels, beam lifetime etc. Machine operational statistics are also presented including a detailed fault analysis. Efforts that have been made to improve reliability are also discussed. On behalf of the Diamond machine staff.

WEPC034	Present Status of Siam Photon Source	storage-ring, undulator, photon, synchrotron	2061
	P. Klysubun, S. Cheedket, G. G. Hoyes, M. Oyamada, W. Pairsuwan, S. Rugmai, P. Sudmuang NSRC, Nakhon Ratchasima
	The Siam Photon Source (SPS) is a 1.2 GeV synchrotron light source situated in Nakhon Ratchasima, Thailand. It is currently in the fourth year of routine operation for synchrotron radiation users. In order to address the increasing user demand for increasing beamtime, better beam position stability, and improved machine reliability, several machine improvements and upgrades have been undertaken during the past year. This report first briefly gives the overview and important parameters of the light source, and then describes the current operation status and operation statistics in 2007. Recent machine improvements, for instance, modernization of injector components, improvement of vacuum system, recalibration of beam position monitors, and orbit correction, are presented together with the initial synopsis of the successful installation of the first insertion device, a permanent magnet planar undulator.

WEPC035	Present Status of PF-ring and PF-AR in KEK	undulator, insertion, insertion-device, photon	2064
	Y. Kobayashi, S. Asaoka, K. Ebihara, K. Haga, K. Harada, T. Honda, T. Ieiri, M. Izawa, T. Kageyama, T. Kasuga, M. Kikuchi, K. Kudo, H. Maezawa, K. Marutsuka, A. Mishina, T. Mitsuhashi, T. Miyajima, H. Miyauchi, S. Nagahashi, T. T. Nakamura, T. Nogami, T. Obina, K. Oide, M. Ono, T. Ozaki, C. O. Pak, H. Sakai, Y. Sakamoto, S. Sakanaka, H. Sasaki, Y. Sato, M. Shimada, T. Shioya, M. Tadano, T. Tahara, T. Takahashi, S. Takasaki, Y. Tanimoto, M. Tejima, K. Tsuchiya, T. Uchiyama, A. Ueda, K. Umemori, S. Yamamoto, Ma. Yoshida, M. Yoshimoto KEK, Ibaraki
	In KEK, we have two synchrotron light sources which were constructed in the early 1980s. One is the Photon Factory storage ring (PF-ring) and the other is the Photon Factory advanced ring (PF-AR). The PF-ring is usually operated at 2.5 GeV and sometimes ramped up to 3.0 GeV to provide photons with the energy from VUV to hard X-ray region. The PF-AR is mostly operated in a single-bunch mode of 6.5GeV to provide pulsed hard X-rays. Operational performances of them have been upgraded through several reinforcements. After the reconstruction of the straight section of the PF-ring in 2005, two short-period-gap undulators have been stably operated. They allow us to produce higher brilliant hard X-rays even at the energy of 2.5 GeV. In March 2008, the circular polarized undulator will be installed in the long straight section of 8.9 m. In the PF-AR, new tandem undulators have been operated since September 2006 to generate much stronger pulsed hard X-rays for the sub-ns resolved X-ray diffraction experiments. In this conference, we report present status of the PF-ring and the PF-AR.

WEPC037	Preparations of BESSY for Top Up Operation	synchrotron, kicker, storage-ring, septum	2067
	P. Kuske, M. Abo-Bakr, W. Anders, T. Birke, K. B. Buerkmann-Gehrlein, M. Dirsat, O. Dressler, V. Duerr, F. Falkenstern, W. Gericke, R. Goergen, F. Hoffmann, T. Kamps, J. Kuszynski, I. Mueller, R. Mueller, K. Ott, J. Rahn, T. Schneegans, D. Schueler, T. Westphal, G. Wuestefeld BESSY GmbH, Berlin D. Lipka DESY, Hamburg
	The synchrotron light source BESSY went into operation for users in 1998. BESSY was not designed initially to allow for Top Up operation, a mode where lost electrons are replaced after minutes while the beam shutters are open and users take data. Since 3 years the facility is improved in order to guarantee safe operation in this risky mode. The work culminated in a one week long Top Up test run at the beginning of this year. The efforts and achievements are described in detail: Improvements of the injector, the pulsed injection elements, the timing system, insertion devices, the additional safety interlocks, and the shielding of the ring.

WEPC041	The Injection System of the SSRF Storage Ring	kicker, storage-ring, septum, multipole	2076
	H. H. Li, B. C. Jiang, L. G. Liu, X. Y. Sun, Y. Xu, W. Zhang, X. M. Zhou SINAP, Shanghai
	A multi-turn injection scheme with four kickers and two septa is used for injection into SSRF storage ring. The 3.5GeV electron beam from the SSRF booster is injected with 6.3 degrees horizontally. All injection elements are set in one 12m long straight section for the requirement of the top-up operation. Simulation and commissioning results will be presented in this paper, such as the injection efficiency and the disturbance on stored beam.

WEPC043	Commissioning of 360 mA Top-up Operation at TLS	feedback, booster, insertion, insertion-device	2082
	Y.-C. Liu, H.-P. Chang, K.-K. Lin, Y. K. Lin, G.-H. Luo NSRRC, Hsinchu
	Taiwan light source started the 200 mA top-up operation in October, 2005, and subsequently, the stored top-up beam current was raised to 300 mA. Several machine issues were observed and solved during past two years. We study the possibility and ability of 360 mA top-up operation at Taiwan light source.

WEPC048	Experimental Characterization of the Insertion Device Effects on Beam Dynamics at SOLEIL	undulator, focusing, coupling, insertion	2097
	P. Brunelle, C. Benabderrahmane, F. Briquez, O. V. Chubar, O. Marcouillé, F. Marteau, A. Nadji, L. S. Nadolski SOLEIL, Gif-sur-Yvette
	SOLEIL, the French 2.75 GeV third generation light source, has been delivering photons to beam lines in routine operation since January 2007. The storage ring is presently equipped with eleven insertion devices: 3 in-vacuum 20mm period undulators (U20), 1 Apple-II type 52mm period undulator (HU52), 3 Apple-II type 80mm period undulators (HU80), 3 electromagnetic 256mm period undulators (HU256) and 1 electromagnetic 640mm period 10m long undulator (HU640). Commissioning of insertion devices consists of characterizing all the effects on beam dynamics in terms of focussing, injection efficiency, beam lifetime and sensitivity to working point, and also in optimizing feedforward tables in order to compensate for closed orbit distortions during field variations (this last point is detailed in other papers). We will focus here on the significant effects observed with some undulators. Measurements, using electron beam, of the transverse variation of field integrals, were helpful to understand bad effects impacting the daily operation. The introduction of real magnetic characteristics in the lattice model is in progress in order to further optimize the working point.

WEPC050	Future Plans for the Advanced Light Source	lattice, emittance, synchrotron, brightness	2103
	D. Robin, H. Nishimura, G. J. Portmann, F. Sannibale, C. Steier LBNL, Berkeley, California
	The Advanced Light Source is now in its 15th year of operation. The facility has managed to continue to improve through continual upgrades to both the capabilities and capacities. Studies have shown that there is still plenty of room for improvements. Here we present plans to provide sustantial relevant improvements with modest cost.

WEPC057	Preparation for Top-up Operation at Diamond	radiation, storage-ring, controls, dipole	2121
	R. P. Walker, P. T. Bonner, F. Burge, Y. S. Chernousko, C. Christou, J. A. Dobbing, M. T. Heron, V. C. Kempson, I. P.S. Martin, G. Rehm, R. J. Rushton, S. J. Singleton, M. C. Wilson Diamond, Oxfordshire R. Bartolini JAI, Oxford
	We report on progress towards top-up operation of Diamond. We describe the extensive safety assessment that has carried out, including the measurements and simulations to assess the potential radiation doses in the case of poor injection efficiency or a top-up "accident", and the various levels of safety measures - procedures, software limits and personnel safety system interlocks - that have been implemented. We describe the top-up control algorithm, the technique used to maintain a given arbitrary filling pattern and the performance in practise. The work carried out to reduce the effect of the injection kickers on the stored beam is described, and the effect of the residual disturbance on user operation is discussed. The modifications to the timing system to provide hardware and software gating signals, and experience with the use of these, are also described.

WEPC058	Operational Performance of the Taiwan Light Source	photon, feedback, synchrotron, synchrotron-radiation	2124
	Ch. Wang, H.-P. Chang, J.-C. Chang, J.-R. Chen, F.-T. Chung, F. Z. Hsiao, G.-Y. Hsiung, K. T. Hsu, C. K. Kuan, C.-C. Kuo, K. S. Liang, K.-K. Lin, Y.-H. Lin, K.-B. Liu, Y.-C. Liu, G.-H. Luo, R. J. Sheu, D.-J. Wang, M.-S. Yeh NSRRC, Hsinchu
	The Taiwan light source (TLS) is a 1.5 GeV third generation light source at the National Synchrotron Radiation Research Center (NSRRC) in Taiwan. It has been routinely operated since its opening in 1993. Several major machine upgrade projects have been undertaken and successfully completed in last 5 years, including implementing of digital bunch-by-bunch feedbacks, superconducting accelerating RF cavity, top-up mode injection, etc. The light source now moves forward to its era of mature operation. It delivers more than 5000 hours user time in 2007 with an up-time of more than 98% and a mean time between failures better than 80 hours. Here, we review its annual operational performance with detailed statistics and discuss the possible improvement directions of machine performance.

WEPC059	Lattice Design of PEP-X as a Light Source Machineat SLAC	wiggler, emittance, dynamic-aperture, sextupole	2127
	M.-H. Wang, Y. Cai, R. O. Hettel, Y. Nosochkov SLAC, Menlo Park, California
	The lattice study for converting the High Energy Ring (HER) of PEP-II into a light source machine with minimal modifications is reported. In this design, a higher phase advance is used in the HER FODO lattice which reduces the emittance to 5 nm at 4.5 GeV without a damping wiggler, and to 0.4 nm with 116 m damping wiggler included in two straight sections out of six. We also study the possibility of replacing one of the six FODO arcs with eight DBA cells to provide additional dispersion free straight sections for the experimental beam lines. The DBA cells will reuse the existing HER and LER (Low Energy Ring) magnets for a minimal cost of the modification. The main parameters and beam dynamics properties of these lattices are presented.

WEPC066	The Transport Line Upgrade Proposal of Hefei Light Source	quadrupole, storage-ring, dipole, coupling	2145
	L. Wang, G. Feng, W.-W. Gao, W. Li, L. Liu, H. Xu, S. C. Zhang USTC/NSRL, Hefei, Anhui
	The injector of Hefei Light Source is a 200 MeV linac. A 55m transport line transfer beam to injection point of storage ring. At current stage, the mismatch of phase space is a potential source limiting the injection efficiency and stable operation of light source. A new focusing configuration of transport line was put forward, where the Twiss parameters matching was implemented. A skew quadrupole was introduced to make horizontal dispersion function matching. This matching between transport line and storage ring would be helpful to improve injection efficiency of HLS storage ring.

WEPC068	Injection into the ALBA Storage Ring	septum, kicker, storage-ring, booster	2151
	G. Benedetti, D. Einfeld, M. Munoz, M. Pont ALBA, Bellaterra E. Huttel FZK, Karlsruhe
	Injection into the ALBA Storage Ring is performed at an energy of 3 GeV in a 7 m long straight section. The injection bump is performed with four kickers. Pulsed magnets are described, in particular the active septum magnet. Tracking of particles has been simulated over a large number of turns, taking into account the magnet errors, the sextupole fields and the physical apertures all along the machine. Specific requirements for top-up injection have been examined, such as a perfect closure of the injection bump, the residual vertical field and the leakage fields from the septum.

WEPC070	Further Optimisation of the Diamond Light Source Injector	booster, linac, klystron, storage-ring	2157
	C. Christou, J. A. Dobbing, V. C. Kempson, A. F.D. Morgan, B. Singh, S. J. Singleton Diamond, Oxfordshire
	The Diamond Light Source injector consists of a 100MeV linac and a 3GeV full-energy booster, and has been providing beam to the storage ring since September 2006. System optimisation has continued throughout the first year of user operation at Diamond. Beam losses on injection into both the booster and storage ring have been minimised by optimisation of operating parameters and the stabilisation of injection elements, particularly the elimination of a linac energy beat. High level software has been developed to monitor turn-by-turn BPM data, allowing booster chromaticity to be measured. The same software generates an automatic log of storage ring frequency spectra on injection, enabling the parasitic measurement of storage ring tune, and can be used to provide information on storage ring impedance and chromaticity. Further optimisation of single bunch injection has been carried out in preparation for top-up operation, and top-up capability has been extended to provide a single bunch filling mode for the storage ring. Injection into the booster at low energy has been demonstrated, providing a mode of operation for the injection system in the event of a linac klystron failure.

WEPC074	The Injection and Extraction Kicker Magnets of the Elettra Booster	extraction, kicker, vacuum, booster	2166
	R. Fabris, G. Pangon ELETTRA, Basovizza, Trieste
	The design, realization and performance of the injection and extraction Kicker magnets of the Booster of Elettra are presented. A window-frame geometry has been chosen due to its transverse symmetry in order to obtain a good field symmetry. A suitable layout for in vacuum operation has been developed. The magnetic core is made by CMD 5005 ferrite blocks, assembled in a stainless steel case, obtaining a single module; one module has been used for the injection Kicker and two such modules, connected in parallel, have been used for the extraction Kicker. In both cases the magnet modules have been installed in stainless steel vacuum chambers. The design of the magnetic core has been checked using the well known 2D POISSON code, thanks to the fact that the magnet’s gap is narrow compared to its length.

WEPC076	Remote Tilt-control System of Injection Bump Magnet in the SPring-8 Storage Ring	synchrotron, synchrotron-radiation, coupling, radiation	2172
	K. Fukami, C. Mitsuda, M. Oishi, M. Shoji, K. Soutome, H. Yonehara, C. Zhang JASRI/SPring-8, Hyogo-ken M. Hasegawa, T. Nakanishi SES, Hyogo-pref. T. Ohshima RIKEN/SPring-8, Hyogo
	The SPring-8 storage ring has four pulse-bump magnets to generate bump orbit for beam injection. Rotational error of the bump magnets around a beam-axis (tilt) induces the stored-beam oscillation in vertical direction due to horizontal error field. In the top-up operation, vertical perturbation of the stored-beam during beam injection is mainly produced by the tilt. We evaluated the tilt angle by measuring of the perturbation turn-by-turn using a single-pass BPM system and realigned bump magnets manually inside the accelerator tunnel. It was required to repeat the measurement and realignment processes two or three times for convergence. To correct the tilts smoothly, we developed a remote tilt-control system. The system consists of two fixed and one movable supports in vertical direction under each bump magnets. The movable support is driven by a stepper motor through 1/30 worm gear in the range of ±4 mrad with the accuracy of less than 0.1 mrad. By using this system, we succeeded complete on-beam reduction of the perturbation.

WEPC077	Pulsed Magnet Systems for the SSRF Injection and Extraction	kicker, extraction, septum, storage-ring	2175
	M. G. Gu, Z. H. Chen, B. Liu, L. Ouyang, R. Wang, Y. Wu, Q. Yuan SINAP, Shanghai
	The injector and the storage ring of the Shanghai Synchrotron Radiation Facility (SSRF) have been built and the commissioning procedure and results are satisfactory. Total of fourteen pulsed magnets are used for the SSRF injection and extraction. In-vacuum ferrite kicker magnets, eddy current septa and 200ms bump magnets are offered for booster injection and extraction. A symmetric bump of stored beam is performed in one of the long straight section of the SSRF storage ring. Four identical kickers with ceramic vacuum chamber and two septa with a sheet of magnetic screening material around the stored beam are equipped for the storage ring injection. The septa can reach maximum 900 Tm field at 8600A with less than 0.01% leakage field for stored beam. And the identical 3.8 us half-sine pulse waveform is excited on the kicker magnets with 3.6kA current and exacted timing. The stability of ±0.05% (rms), low leakage field and identical bump are emphasized so that the residual closed orbit disturbance can be minimized for top-up injection.

WEPC078	Eddy Current Septum Magnets for Booster Injection and Extraction and Storage Ring Injection at SSRF	septum, storage-ring, booster, vacuum	2177
	M. G. Gu, R. Chen, Z. H. Chen, B. Liu, L. Ouyang SINAP, Shanghai
	There are 6 in-vacuum eddy current septum magnets used for injection and extraction in the SSRF booster and storage ring. The booster extraction thick septum magnets generate magnetic field over 1 Tesla, special attentions were paid to coils and their support design because of the shock force and the high heat which is hard to be dissipated in vacuum environment. The good transverse homogeneity in the gap has been achieved by careful design, precise machining and accurate assembly. An extremely low leakage field on the stored beam is another key feature of these magnets thanks to the high permeability Mu metal. Magnetic field measurement was conducted with both point coil and long integral coil, and the results agreed well with the OPERA-2d/3d simulations. An inner tube with RF finger flanges at each end is added to keep the continuity of impedance for the circulating beam. There is no vacuum separation between the inner tube and magnet chamber.

WEPC079	Elettra Booster Commissioning and Operation	booster, storage-ring, optics, emittance	2180
	F. Iazzourene ELETTRA, Basovizza, Trieste
	The new injector, consisting of a 100MeV linac and a 2.5GeV booster synchrotron, replaced the old limited energy 1.2GeV linac by the end of 2007. The paper reports on its commissioning phases and results together with its present status of operation. "Overview of the Status of the Elettra Booster Project", WEPC090, these proceedings.

WEPC081	Improvement on Pulsed Magnetic Systems at SOLEIL	kicker, vacuum, storage-ring, pulsed-power	2183
	P. Lebasque, R. Ben El Fekih, M. Bol, J.-P. Lavieville, A. Loulergue, D. Muller SOLEIL, Gif-sur-Yvette
	Two "machine study" kicker systems have been designed, built and installed on the storage ring of SOLEIL to kick the stored beam in the horizontal and the vertical planes, in order to investigate the non-linear dynamic of the ring with different insertion devices configurations. This article will describe the different aspects of the design of the two magnets and vacuum chambers, and of their fast high current pulsed power supplies, working with high voltage switches based on MOS transistors. The electrical and magnetic measurements will be presented. The second part of the paper will describe the modifications brought to the thick septum magnet system of the ring injection, in view to reduce the stray field seen by the stored beam. It also presents the different tunings performed on the four injection kickers, in order to reduce the amplitude of the residual bump along the ring down to a very low level. Theses adjustements are aimed to minimize the disturbances on the stored beam when operating the Synchrotron in "Top Up" injection mode.

WEPC083	Status of the SSRF Booster	booster, dipole, extraction, power-supply	2189
	D. M. Li, H. W. Du, H. H. Li, Z. T. Zhao SINAP, Shanghai
	The SSRF booster is a 2Hz electron synchrotron. It accelerates electrons, coming from a 150 MeV linac, to a final energy of 3.5 GeV in 250ms and extracts them into the storage ring. The booster lattice is based on a FODO structure with missing dipoles, forming 28 cells with 8 straight sections of a 2-folder symmetry and 180m circumference. The SSRF injector (Include 150 MeV linac, booster and two transport lines) was designed for Top-Up injection, which has single-bunch and multi-bunch beam modes. After 9 months installation and pre-commissioning, the SSRF booster commissioning started on September 30, 2007. The first 3.5GeV beam was obtained On Oct.5, and the first extracted beam was obtained on Oct.29, 2007. The booster serves as a injector for storage ring from Dec. 21, 2007. In this paper, the design, installation and commissioning of the SSRF booster and transport lines are described.

WEPC089	Status of the NSLS-II Injection System Design	booster, storage-ring, linac, lattice	2198
	T. V. Shaftan, A. Blednykh, G. Ganetis, W. Guo, R. Heese, H.-C. Hseuh, E. D. Johnson, S. Krinsky, Y. J. Li, R. Meier, S. Ozaki, I. Pinayev, M. Rehak, J. Rose, S. Sharma, O. Singh, J. Skaritka, N. Tsoupas, F. J. Willeke, L.-H. Yu BNL, Upton, New York
	NSLS-II is a new ultra-bright 3rd generation 3GeV light source planned to be built at Brookhaven National Laboratory. The design of this facility is well under way. The requirement for the compact injector complex which has to continuously provide 3GeV electrons for top off injection into the storage ring is very demanding: high reliability, low loss, relatively high charge (10nC). The injector consists of linear accelerator, a full-energy booster, as well as transport lines and injection straight section. A large three dimensional dynamic aperture through the entire acceleration cycle in the booster synchrotron is required. Tolerances on pulsed magnets for the beam transfer are very tight in order to minimize injection losses and disturbance of the stored beam in the main ring. The components of the injector are optimized for high reliability and availability. In this paper we give an overview of the NSLS-II injector, discuss status, specifications and design challenges.

WEPC090	Overview of the Status of the Elettra Booster Project	booster, linac, storage-ring, extraction	2201
	M. Svandrlik ELETTRA, Basovizza, Trieste
	The Elettra Booster Project is in its final phase. The 100 MeV linac pre-injector and the 2.5 GeV booster were constructed and installed on schedule and within the foreseen budget. Elettra was shut down during the last autumn to switch from the old linac injector to the new booster. The new 2.5 GeV transfer line was successfully connected to the storage ring by December 2007. During the same period the booster commissioning was started. Operation for users of the light source, with the booster as injector, is scheduled in March 2008. An overview of the booster systems and of the current status of its commissioning and operation is presented and discussed here.

WEPC091	Beam Injection by Use of a Pulsed Sextupole Magnet at the Photon Factory Storage Ring	sextupole, storage-ring, pulsed-power, power-supply	2204
	H. Takaki, N. Nakamura ISSP/SRL, Chiba K. Harada, T. Honda, Y. Kobayashi, T. Miyajima, S. Nagahashi, T. Obina, A. Ueda KEK, Ibaraki
	We will install a pulsed sextupole magnet (PSM) in order to test a new injection system for the top-up injection at the Photon Factory storage ring (PF ring) in the spring of 2008. A parabolic magnetic field of the PSM can give an effective kick to the injected beam that passes a distant region from the field center. And there is little modulation of the orbit of the stored beam because it passes around the center of the PSM. To achieve the beam injection at the PF ring, the PSM has a length of 0.3m, a magnetic field of 400 Gauss at a peak current of 3000A and a pulse width of 2.4μsec in a half-sine form. We already made the PSM and measured the magnetic field. We will report the result of the PSM beam injection at the PF ring.

WEPC092	A Pulsed Quadrupole Magnet Injection at the PF-AR Storage Ring	beam-losses, dipole, quadrupole, factory	2207
	H. Takaki, N. Nakamura ISSP/SRL, Chiba K. Harada, Y. Kobayashi, T. Miyajima, S. Nagahashi, T. Obina, A. Ueda, K. Umemori KEK, Ibaraki
	We have examined a beam injection system that used a pulsed quadruple magnet (PQM) at the PF-AR storage ring since the spring of 2004. The system is operating well and the accumulation of the beam up to 60mA in the single bunch operation is possible by the current state. The beam injection system that uses the PQM does not require a conventional injection bump orbit, and has the feature that only one PQM in the injection part is needed. An injected beam is kicked to be proportional to the distance from the center and captured afterwards. On the other hand, the pulse kick hardly influences the stored beam at the magnetic field center of the PQM. We report on the result of collecting the basic data of the influence on the PQM beam injection at the PF-AR storage ring.

WEPC093	Finalized Design of the Pulsed Magnets and their PS for SESAME Ring Injection	kicker, septum, vacuum, power-supply	2210
	S. Varnasseri, A. Nadji SESAME, Amman J.-P. Lavieville, P. Lebasque SOLEIL, Gif-sur-Yvette
	The design of the SESAME storage ring injection pulsed magnet systems have been improved in order to take benefit of the most recent realizations in Synchrotrons. These pulsed systems are optimised for the injection into the 2.5GeV storage ring of the 800 MeV electrons beam prepared by the Booster. The septum magnet is based on a direct driven septum technology, out of vacuum, with a thin vacuum chamber of rectangular cross section permitting to get a good field transverse homogeneity. The four kicker magnets will be of the window frame geometry, around a racetrack alumina vacuum chamber, integrating a forced air cooling in order to avoid significant thermal heating due to the stored beam. These magnets can be opened for backup and will be completely CEM shielded. Their pulsed power supplies will be built based on solid-state HV switches, even for short half-sine pulses generation.

WEPC094	Thermo-Cathode RF Gun for BINP Race-Track Microtron-Recuperator	emittance, cathode, gun, bunching	2213
	V. Volkov, E. Kendjebulatov, S. A. Krutikhin, G. Y. Kurkin, V. M. Petrov, I. K. Sedlyarov, N. Vinokurov BINP SB RAS, Novosibirsk
	In 2007 the thermo-cathode RF gun for the Budker INP energy recovery linac (ERL) was designed. The RF gun is capable to emit the electron bunches with the energy of 300 keV, average current of 100 mA, and repetition frequency of 90 MHz. The new injector is adapted to the existing RF system for beam bunching, accelerating and injecting to the linac of the microtron. Its advantage is the absence of high potential of 300 kV at the control circuits of the cathode; therefore the maintenance is simplified. Also due to the absence of the cathode back bombardment by residual gas ions in the RF cavity, the lifetime of the cathode is increased and the obtaining of the repetition frequency up to 90 MHz becomes feasible. In the paper the main characteristics of the injector, its design and results of beam dynamics calculations with optimised regimes are presented.

WEPC095	Progress in Raising the Energy of the CAMD Linac to 300 MeV	linac, klystron, simulation, controls	2216
	Y. Wang, K. J. Morris, V. P. Suller, S. Wang LSU/CAMD, Baton Rouge, Louisiana
	The possibilities and methods for higher energy injection at CAMD have been discussed previously. All components of the former HELIOS 1 linac have now been transferred to CAMD from Jefferson Laboratory. It is planned to reconfigure the CAMD injector linac by installing one of the HELIOS accelerating sections in addition to the two existing CAMD sections, thereby increasing the energy to 300MeV. The optimum arrangement for installing the 300 MeV linac in the existing tunnel has been established. Meanwhile, the arrangements and upgrades of sub-systems are being prepared, simulations of the electron beam trajectory by MATLAB based linear accelerator program are being made, and recommissioning the major HELIOS linac components is underway. In the paper, the detailed technical design of the 300 MeV linac is proposed, the key parameters of the linac are presented, and the benefits of 300 MeV injection to the CAMD synchrotron radiation light source are mentioned.

WEPC097	Active Shimming of the Dynamic Multipoles of the BESSY UE112 APPLE Undulator	multipole, undulator, electron, dynamic-aperture	2222
	J. Bahrdt, W. Frentrup, A. Gaupp, M. Scheer, G. Wuestefeld BESSY GmbH, Berlin
	APPLE undulators produce strong dynamic multipoles in the elliptical and inclined mode which can significantly reduce the electron beam dynamic aperture. The multipole strength scales with the square of the period length and the inverse of the electron energy. A large horizontal dynamic aperture is essential for top up operation. For the BESSY devices the dynamic multipoles generated in the elliptical mode have efficiently been compensated with iron shims. For the inclined mode no passive compensation scheme is available. In case of the strong BESSY 112mm APPLE device flat current wires have been glued onto the undulator chamber, which permit the cancellation of arbitrary multipoles. The full horizontal dynamic aperture has been recovered in the inclined mode. Tracking simulations and measurements of the electron beam performance for uncompensated and compensated dynamic multipoles will be presented.

WEPC119	First Year's Experience of Diamond Insertion Devices	undulator, photon, wiggler, insertion	2285
	E. C. Longhi, R. T. Fielder, I. P.S. Martin, J. C. Schouten, B. Singh Diamond, Oxfordshire R. Bartolini JAI, Oxford
	Diamond was commissioned at 3GeV with seven insertion devices (IDs) already installed. The phase 1 IDs include five in-vacuum permanent magnet undulators, an APPLE–2 variable polarization device, and a superconducting wiggler. Since initial commissioning of the ring, three more in-vacuum undulators have been installed, and another three devices will be installed in the coming year. In this paper, we describe commissioning, characterizing, and operating with these IDs.

WEPC130	Shimming Correction of Dynamic Multipole Effects on Apple-II Type EPUs at the ALS	multipole, polarization, undulator, simulation	2311
	C. Steier, A. Madur, S. Marks, S. Prestemon, T. Scarvie, D. Schlueter, W. Wan LBNL, Berkeley, California
	Elliptically Polarizing Undulators that provide full photon polarization control also have fast, intrinsic transverse roll-off of the magnetic field. The roll-off is particularly fast for vertical polarization settings, and can have big detrimental effects on the nonlinear single particle dynamics. Particularly low and medium energy light sources and long period EPUs are prone to those effects. The three existing 50mm period EPUs at the ALS have been retrofitted with shims to correct for these dynamic multipole effects and a new 90mm period device which otherwise would have caused a huge reduction in dynamic aperture has been shimmed before installation. Simulations and beam measurements will be presented, including frequency map measurements.

WEPC141	Septa and Distributor Developments for H^- Injection into the Booster from Linac4	vacuum, linac, septum, booster	2338
	J. Borburgh, B. Balhan, T. Fowler, M. Hourican, W. J.M. Weterings CERN, Geneva
	The construction of Linac4 requires the modification of the existing injection system of the CERN PS Booster. A new transfer line will transport 160 MeV H^- ions to this machine. A system of 5 pulsed magnets (BIDIS) and 3 vertical septa (BISMV) will distribute and inject the Linac pulses into the four-vertically separated Booster rings. Subsequently the beam will be injected horizontally, using a local bump created with bumpers (BS magnets) to bring the injected H^- beam together with the orbiting proton beam onto the stripper foil. To accommodate the injected H^- beam, the first of the BS magnets will have to be a septum like device, deflecting only the orbiting beam. This paper highlights the requirements and technical issues and describes the solutions to be adopted for both the BIDIS and BISMV. The results of initial prototype testing of the BIDIS magnet will also be presented.

WEPC142	Design of Pulsed Magnets for the Taiwan Photon Source	septum, kicker, vacuum, storage-ring	2341
	C.-H. Chang, C. K. Chan, J.-R. Chen, C.-S. Fann, M.-H. Huang, C.-S. Hwang, F.-Y. Lin, Y.-H. Liu, C.-S. Yang NSRRC, Hsinchu
	A new Taiwan Photon source requires a high stability pulsed magnets for the top-up mode injection operation. We present a preliminary design of the pulsed magnets used for injection into the 3 GeV storage ring. A 0.6 m long kicker magnet prototype is fabricated for testing the field performance. The field testing results are described in this work. The septum magnet with a 0.4 mm thickness stainless steel vacuum chamber is real tested at 3 Hz operation. The field performance, the stray fields and the eddy current effect are presented in this paper.

WEPC163	Modification of a Spare Septum Magnet for SNS Ring Injection Dump Beam Line	septum, simulation, vacuum, proton	2389
	J. G. Wang ORNL, Oak Ridge, Tennessee
	The SNS ring injection dump septum magnet has been suffering the heaviest beam losses since the ring commissioning. These beam losses are caused by a number of design and operation problems such as incorrect location of one chicane dipole, incorrect chicane dipole setting, and inadequate aperture of the injection dump septum. We have modified a spare septum by increasing its vertical and horizontal aperture and by adding specially designed z-bumps for one of the waste beams. This paper reports the detailed modification results, including 3D particle trajectory calculations and experimental measurements.

WEPD006	Conceptual Design of Superferric Magnets for PS2	cryogenics, dipole, quadrupole, magnet-design	2410
	L. Bottura, G. De Rijk, M. Karppinen, G. Kirby, R. Maccaferri, C. Maglioni, V. Parma, L. Rossi, W. Scandale, L. Serio, D. Tommasini CERN, Geneva
	We analyze feasibility and cost of a superferric magnet design for the PS2, the novel 50 GeV ring that should replace the PS in the CERN injector chain. Specifically, we provide the conceptual design of dipole and quadrupoles, including considerations on cryogenics and powering. The magnets have warm iron yoke, and cryostated superconducting coils embedded in the magnet, which reduces AC loss at cryogenic temperature. The superconductor has large operating margin to endure beam loss and operating loads over a long period of time. Although conservative, and without any critical dependence on novel technology developments, this superconducting option appears to be attractive as a low-power alternative to the normal-conducting magnets that are the present baseline for the PS2 design. In addition it provides flexibility in the selection of flat-top duration at no additional cost.

WEPD021	Magnetic Field Characteristics of a SIS 100 Full Size Dipole	vacuum, multipole, dipole, synchrotron	2452
	P. Schnizer, E. S. Fischer GSI, Darmstadt P. G. Akishin JINR, Dubna, Moscow Region R. V. Kurnyshov Electroplant, Moscow B. Schnizer TUG/ITP, Graz P. A. Shcherbakov IHEP Protvino, Protvino, Moscow Region G. Sikler, W. Walter BNG, Würzburg
	FAIR will feature two superconducting fast ramped synchrotrons. The dipole magnets for one of them, SIS 100, have been designed and prototypes were built. The properties of the magnetic field were analysed using OPERA (for DC operation) and ANSYS for dynamic calculations. Elliptic multipoles fulfilling the Laplace Equation in plane elliptic coordinates describe the field within the whole aperture consistently within a single expansion. Further circular multipoles, valid within the ellipse, can be calculated analytically from the elliptic multipoles. The advantage of this data representation is illustrated on the FEM calculation performed for SIS 100 dipoles and quadrupoles currently foreseen for the machine. The magnetic field of one of these prototypes was measured using a mole. We compare the results of the calculation to the measurement for the static as well as the dynamic mode.

WEPD031	Dependence of the Static and Dynamic Field Quality of the LHC Superconducting Dipole Magnets on the Pre-cycle Ramp Rate	dipole, sextupole, multipole, acceleration	2479
	N. J. Sammut, L. Bottura, G. Deferne, W. Venturini Delsolaro, R. Wolf CERN, Geneva N. J. Sammut University of Malta, Faculty of Engineering, Msida
	The allowed multipoles in the Large Hadron Collider (LHC) superconducting dipole magnets decay whilst on a constant current plateau. It is known that the decay amplitude is largely affected by the powering history of the magnet, and particularly by the pre-cycle flat top current and duration and the pre-injection preparation duration. Recently, it was observed that the decay amplitude is also highly dependent on the pre-cycle ramp rate, which has an indirect effect also on the sample of data taken at constant field along the magnet loadlines. This is an important consideration to be included in the Field Description for the LHC (FiDeL), to cope with the difference between the test procedure followed for series tests and the expected cycles during the machine operation. This paper presents the results of the measurements performed to investigate this phenomenon and describes the method included in FiDeL to represent this dependence.

WEPD034	Main Field Tracking Measurement in the LHC Superconducting Dipole and Quadrupole Magnets	dipole, controls, quadrupole, instrumentation	2485
	P. Xydi, R. Alemany-Fernandez, L. Bottura, G. Deferne, M. Lamont, J. Miles, R. Mompo, M. Strzelczyk, W. Venturini Delsolaro CERN, Geneva N. J. Sammut University of Malta, Faculty of Engineering, Msida
	One of the most stringent requirements during the energy ramp of the Large Hadron Collider (LHC) is to have a constant ratio between dipole-quadrupole and dipole-dipole field so as to control the variation of the betatron tune and of the beam orbit throughout the acceleration phase, hence avoiding particle loss. To achieve the nominal performance of the LHC, a maximum variation of ±0.003 tune units can be tolerated. For the commissioning with low intensity beams, acceptable bounds are up to 30 times higher. For the quadrupole-dipole integrated field ratio, the above requirements translate in the tight windows of 6 ppm and 180 ppm, while for dipole differences between sectors the acceptable error is of the order of 10^-4. Measurement and control at this level are challenging. For this reason we have launched a dedicated measurement R&D to demonstrate that these ratios can be measured and controlled within the limits for machine operation. In this paper we present the techniques developed to power the magnets during the current ramps, the instrumentation and data acquisition setup used to perform the tracking experiments, the calibration procedure and the data reduction employed.

WEPP003	Optics Flexibility in the LHC at Top Energy	optics, quadrupole, betatron, luminosity	2524
	M. Aiba, H. Burkhardt, S. D. Fartoukh, M. Giovannozzi, S. M. White CERN, Geneva
	We report on studies of optics flexibility which allow for tune changes of the order of half a unit at top energy in the LHC. We describe how this could be done using one or several of the insertions IR2, IR4, IR8 or the main quadrupoles and discuss and compare the implications. This flexibility could be used to compensate for the loss in tune for high beta optics and may make it feasible to use the standard injection and ramp for these configurations. Potential further applications are also highlighted.

WEPP004	Overall Optics Solutions for Very High Beta in Atlas	optics, insertion, emittance, luminosity	2527
	S. M. White, H. Burkhardt, P. M. Puzo CERN, Geneva S. Cavalier, M. Heller LAL, Orsay
	An insertion optics with a beta-star of at least 2600 m has been requested by the ATLAS experiment at the LHC. This is very far from the standard LHC physics optics and implies a significant reduction in the phase advance from this insertion corresponding to about half a unit in tune. We describe several alternatives how this could be integrated in overall LHC optics solutions with the possibility to inject, ramp and un-squeeze to the required very high beta.

WEPP011	Setup and Performance of RHIC for the 2008 Run with Deuteron and Gold Collisions	luminosity, ion, lattice, feedback	2548
	C. J. Gardner, N. P. Abreu, L. Ahrens, J. G. Alessi, M. Bai, D. S. Barton, J. Beebe-Wang, M. Blaskiewicz, J. M. Brennan, K. A. Brown, D. Bruno, J. J. Butler, P. Cameron, C. Carlson, R. Connolly, T. D'Ottavio, A. J. Della Penna, K. A. Drees, W. Fischer, W. Fu, G. Ganetis, J. W. Glenn, M. Harvey, T. Hayes, H. Huang, P. F. Ingrassia, J. Kewisch, R. C. Lee, V. Litvinenko, Y. Luo, W. W. MacKay, M. Mapes, G. J. Marr, A. Marusic, R. J. Michnoff, C. Montag, J. Morris, B. Oerter, F. C. Pilat, E. Pozdeyev, V. Ptitsyn, G. Robert-Demolaize, T. Roser, T. Russo, P. Sampson, J. Sandberg, T. Satogata, C. Schultheiss, F. Severino, K. Smith, D. Steski, S. Tepikian, R. Than, P. Thieberger, D. Trbojevic, N. Tsoupas, J. E. Tuozzolo, A. Zaltsman, K. Zeno, S. Y. Zhang BNL, Upton, Long Island, New York
	This year deuterons and gold ions were collided in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) for the first time since 2003. The setup and performance of the collider for this run is reviewed with a focus on improvements that have led to an order of magnitude increase in luminosity since the 2003 run.

WEPP026	Reliable Operation of the AC Dipole in the LHC	dipole, resonance, emittance, simulation	2575
	R. Tomas, S. D. Fartoukh, J. Serrano CERN, Geneva
	The AC dipole in the LHC will not only provide transverse oscillations without emittance growth but also with a safety guarantee. These two features are due to the adiabaticity of the excitation. However chromaticity and non-linear fields spoil this adiabaticity. This paper assesses the margins of the relevant parameters for a reliable and safe operation of AC dipoles in the LHC.

WEPP036	DAΦNE Setup and Operation with the Crab-Waist Collision Scheme	luminosity, sextupole, collider, vacuum	2599
	C. Milardi, D. Alesini, M. E. Biagini, C. Biscari, R. Boni, M. Boscolo, F. Bossi, B. Buonomo, A. Clozza, G. O. Delle Monache, T. Demma, E. Di Pasquale, G. Di Pirro, A. Drago, A. Gallo, A. Ghigo, S. Guiducci, C. Ligi, F. Marcellini, G. Mazzitelli, F. Murtas, L. Pellegrino, M. A. Preger, L. Quintieri, P. Raimondi, R. Ricci, U. Rotundo, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, S. Tomassini, C. Vaccarezza, M. Zobov INFN/LNF, Frascati (Roma) N. Arnaud, D. Breton, P. Roudeau, A. Stocchi, V. Variola, B. F. Viaud LAL, Orsay S. Bettoni CERN, Geneva P. Branchini roma3, Rome M. Esposito Rome University La Sapienza, Roma I. Koop, E. B. Levichev, P. A. Piminov, D. N. Shatilov BINP SB RAS, Novosibirsk K. Ohmi KEK, Ibaraki E. Paoloni University of Pisa and INFN, Pisa M. Schioppa INFN Gruppo di Cosenza, Arcavacata di Rende (Cosenza) V. V. Smaluk BINP, Novosibirsk P. Valente INFN-Roma, Roma
	In the second half of 2007 a major upgrade has been implemented on the Frascati DAΦNE collider in order to test the novel idea of Crab Waist collisions. New vacuum chambers and permanent quadrupole magnets have been designed, fabricated and installed to realize the new configuration. At the same time the performances of relevant hardware components, such as fast injection kickers and shielded bellows have been improved relying on new design concepts. The collider has been successfully commissioned in this new configuration. The paper describes the new layout as well as several experimental results about linear and non-linear optics setup and optimization, damping of beam instabilities and discusses the obtained luminosity performances.

WEPP039	Design of a 10³⁶ cm^-2 s^-1 Super-B Factory	interaction-region, collider, luminosity, emittance	2605
	J. Seeman, K. J. Bertsche, A. Novokhatski, M. K. Sullivan, U. Wienands, W. Wittmer SLAC, Menlo Park, California S. Bettoni CERN, Geneva M. E. Biagini, R. Boni, M. Boscolo, T. Demma, A. Drago, S. Guiducci, P. Raimondi, S. Tomassini, M. Zobov INFN/LNF, Frascati (Roma) A. Bogomyagkov, I. Koop, E. B. Levichev, S. A. Nikitin, P. A. Piminov, D. N. Shatilov BINP SB RAS, Novosibirsk G. Marchiori INFN-Pisa, Pisa E. Paoloni University of Pisa and INFN, Pisa
	Submitted for the High Luminosity Study Group for an Asymmetric Super-B-Factory: Parameters are being studied for a high luminosity e⁺e^- collider operating at the Upsilon 4S that would deliver a luminosity of 1 to 2 x 10³⁶/cm²/s. This collider would use a novel combination of linear collider and storage ring techniques. In this scheme an electron beam and a positron beam are stored in low-emittance damping rings similar to those designed for a Linear Collider (LC) or the next generation light source. A LC style interaction region is included in the ring to produce sub-millimeter vertical beta functions at the collision point. A large crossing angle (±25 mrad) is used at the collision point to allow beam separation. A crab-waist scheme is used to reduce the hourglass effect and restore peak luminosity. Beam currents of about 1.8 A in 1400 bunches can produce a luminosity of 10³⁶/cm²/s with upgrade possibilities. Design parameters and beam dynamics effects are discussed.

WEPP053	Beam Transport in Toroidal Magnetic field	beam-transport, simulation, proton, ion	2641
	N. S. Joshi, M. Droba, O. Meusel, U. Ratzinger IAP, Frankfurt am Main
	The concept of a storage ring with toroidal magnetic field was presented in the two previous EPAC conferences. Here we report the first results of experiments performed with beam transport in toroidal magnetic fields and details of the injection system. The beam transport experiments were carried out with 30 degree toroidal segments with an axial magnetic field of 0.6T. The space charge force and dynamics of a proton beam near the brillouin flow limit are presented here. The multiturn injection system relies on a specified injection coil together with an electric kicker system. The scaling law for the complete storage ring is discussed. The advantages and disadvantages for such a stellarator type storage ring on the 5T level will be reviewed.

WEPP057	Fitting Algorithms for Optical and Beam Parameters in Transfer Lines with Application to the LHC Injection Line TI2	emittance, optics, extraction, quadrupole	2647
	E. Benedetto, I. V. Agapov, F. Follin, V. Kain CERN, Geneva
	As part of the commissioning with beam of the transfer line TI2 from the SPS to the LHC, a series of optics measurements has been conducted. The paper presents the results in terms of Twiss parameters (including the dispersion), emittance and momentum spread obtained from the combination of trajectory and beam profile measurements. Profiting from the redundancy of monitors, there is a possibility of applying different fitting algorithms to retrieve beam parameters and to extract information on the optics of the line. The results from the different fit methods applied to the data will be compared with the expected values and cross-checked with independent measurements with a particular emphasis on the error analysis.

WEPP058	Optics Measurements and Matching of TT2-TT10 Line for Injection of the LHC Beam in the SPS	optics, scattering, emittance, betatron	2650
	E. Benedetto, G. Arduini, A. Guerrero, D. Jacquet CERN, Geneva
	A well matched injection in the SPS is very important for preserving the emittance of the LHC beam. The paper presents the algorithms used for the analysis and the results of the optics measurements done in the transfer line TT2-TT10 and in the SPS. The dispersion is computed by varying the beam momentum and recording the offsets at the BPMs, while the Twiss parameters and emittance measurements in TT2-TT10 are performed with beam profile monitors equipped with OTR screens. These results are completed by those obtained with a matching monitor installed in the SPS as a prototype for the LHC. This device makes use of an OTR screen and a fast acquisition system, to get the turn by turn beam profiles right at injection in the ring, from which the beam mismatch is computed and compared with the results obtained in the line. Finally, on the basis of such measurments, a betatron and dispersion matching of TT2-TT10 for injection in the SPS has been performed and successfully put in operation.

WEPP066	Results from the LHC Beam Dump Reliability Run	dumping, kicker, vacuum, extraction	2671
	J. A. Uythoven, A. Antoine, E. Carlier, F. Castronuovo, L. Ducimetière, E. Gallet, B. Goddard, N. Magnin, H. Verhagen CERN, Geneva
	The LHC Beam Dumping System is one of the vital elements of the LHC Machine Protection System and has to operate reliably every time a beam dump request is made. Detailed dependability calculations have been made, resulting in expected rates for the different system failure modes. A 'reliability run' of the system, installed in its final configuration in the LHC, has been made to discover infant mortality problems and to compare the occurrence of the measured failure modes with their calculations.

WEPP068	Impact Distribution of the Beam Losses at the LHC Collimators in Case of Magnet Failures	quadrupole, dipole, simulation, collimation	2674
	A. Gomez Alonso CERN, Geneva
	During LHC operation, magnet failures may affect the beam optics leading to proton losses in the collimators. These losses, with about 360MJ of stored energy per beam at nominal collision operation, are potentially dangerous for the accelerator equipment. The LHC Machine Protection Systems ensure that the beam is extracted safely before these losses can produce any damage. As a magnet failure develops, so does the distribution of the lost particles, longitudinally along the ring as well as transversally at each collimator. The transversal impact distributions of lost particles at the most affected collimators and their evolution with time have been studied for representative magnet failures in the LHC. It has been found that the impact distribution at a given collimator can be approximated by an exponential function with time-dependent parameters. The average impact parameter ranges from about 7 to 620 μm for the cases studied.

WEPP082	Recirculator SALO Project in NSC KIPT	electron, target, extraction, laser	2710
	I. S. Guk, A. N. Dovbnya, S. G. Kononenko, F. A. Peev, A. S. Tarasenko NSC/KIPT, Kharkov J. I.M. Botman TUE, Eindhoven
	In NSC KIPT the electron recirculator project on energy up to 730 MeV is developing. The accelerator is designed first of all as a facility for basic research in the field of a nuclear physics. Superconducting accelerating structure TESLA on frequency of 1.3 GHz, developed in DESY, is used for a speed-up of electrons. Isochronous and achromatic system of injection and magneto-optical system recirculator arcs allow to gain good beam parameters on an exit of the accelerator. Channels of an extraction of particles on experimental stations are presented. Opportunities for use of recirculator beams for applied research are considered.

WEPP110	Design and Operational Experience of the MICE Target	target, insertion, beam-losses, acceleration	2764
	C. N. Booth, P. Hodgson, L. C. Howlett, M. T. Mohammad, R. Nicholson, P. J. Smith Sheffield University, Sheffield N. Schofield University of Manchester, School of Electrical and Electronic Engineering, Manchester
	The MICE experiment requires a beam of low energy muons to test muon cooling. This beam will be derived parasitically from the ISIS synchrotron. A novel target mechanism has been developed which allows the insertion of a small titanium target into the proton beam halo on demand. The target must remain outside of the beam envelope during acceleration, and then overtake the beam during the last 2ms before extraction. The technical specifications are demanding, and require large accelerations and precise and reproducible location of the target in each cycle. The mechanism must also operate in a high radiation environment, and the moving parts and materials must be compatible with the stringent requirements of operating in a working accelerator. The design, and the commissioning and operational experience using this system during the first operating periods in 2008 is described.

WEPP169	The MERIT High-power Target Experiment at the CERN PS	proton, target, diagnostics, factory	2886
	H. G. Kirk, H. Park, T. Tsang BNL, Upton, Long Island, New York J. R.J. Bennett STFC/RAL/ISIS, Chilton, Didcot, Oxon O. Caretta, P. Loveridge STFC/RAL, Chilton, Didcot, Oxon A. J. Carroll, V. B. Graves, P. T. Spampinato ORNL, Oak Ridge, Tennessee I. Efthymiopoulos, A. Fabich, F. Haug, J. Lettry, M. Palm, H. Pereira CERN, Geneva K. T. McDonald PU, Princeton, New Jersey N. V. Mokhov, S. I. Striganov Fermilab, Batavia, Illinois
	The MERIT experiment was designed as a proof-of-principle test of a target system based on a free mercury jet inside a 15-T solenoid that is capable of sustaining proton beam powers of up to 4MW. The experiment was run at CERN in the fall of 2007. We describe the results of the tests and their implications.

THXG01	SNS Progress, Challenges and Upgrade Options	linac, target, beam-losses, beam-transport	2892
	S. Henderson ORNL, Oak Ridge, Tennessee
	The talk describes the progress of SNS towards 1 MW, includes discussion of the challenges of successfully running high power superconducting pulsed proton linacs, and also looks forward to upgrade programmes.
	Slides

THXG02	J-PARC Progress and Challenges of Proton Synchrotrons	linac, proton, beam-losses, acceleration	2897
	M. Kinsho JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
	After briefly outlining the status of the J-PARC linac, the talk should concentrate on describing the outcome of the 3 GeV J-PARC synchrotron commissioning programme, and also include discussion of the challenges of successfully running high power proton synchrotrons.
	Slides

THPC004	Chromatic and Wakefield Effects in PSI-XFEL Linac	linac, emittance, quadrupole, electron	2978
	B. Grigoryan, G. A. Amatuni, V. M. Tsakanov CANDLE, Yerevan R. J. Bakker, Y. Kim, M. Pedrozzi, J.-Y. Raguin PSI, Villigen
	Detailed knowledge about the wakefield and chromatic effects on electron beam emittance is an important issue to preserve the natural emittance of the beam in linear accelerators for FEL. The study of these two effects for beam and accelerator components imperfections in PSI-XFEL S-Band linear accelerator is presented. Emittance dilution caused by the beam coherent oscillations, accelerating section and quadrupole misalignments is analysed. The residual chromatic emittance dilution of the corrected trajectory is evaluated.

THPC006	Applications of a BPM-based Technique for Measuring Real Space Distributions in the Spallation Neutron Source Ring and Transport Lines	target, simulation, coupling, diagnostics	2984
	S. M. Cousineau, T. A. Pelaia, M. A. Plum ORNL, Oak Ridge, Tennessee
	The SNS accumulator ring and associated transport lines are designed to accumulate and transport up to 1.5·10¹⁴ ppp to a liquid mercury target for neutron spallation. Since commissioning, a dedicated effort has been put forth to characterize the lattice and beam dynamics at low intensity. Toward this goal, a BPM-based technique for measuring real space beam distributions at low beam intensities was developed. Recently, this technique has been used to diagnose and localize a strong source of coupling in the lattice, to verify and troubleshoot complementary diagnostics devices, and to provide data for code benchmarking. Other potential applications of this technique include investigations of single particle dynamics and resonances, studies of injection painting techniques, and possibly measurement of quadrupole power supply errors in the ring. In this paper we present the results of applying this technique to various situations in the SNS ring and transport lines, including the first ORBIT benchmarks of the SNS ring and RTBT. T. Pelaia et al, Nucl. Instr. And Methods, in progress.

THPC011	The CR-RESR Storage Ring Complex of the FAIR Project	dynamic-aperture, extraction, antiproton, quadrupole	2996
	A. Dolinskii, O. E. Gorda, S. A. Litvinov, F. Nolden, C. Peschke, I. Schurig, M. Steck GSI, Darmstadt D. Obradors-Campos MICINN, Madrid
	In frame of the FAIR project (at GSI, Germany) the CR-RESR storage ring complex has been designed for efficient cooling, accumulation and deceleration of antiproton and rare isotopes beams. The complex consists of the Collector Ring (CR) and the accumulator / decelerator ring RESR. The large acceptance CR will be operated at three different optical modes, two of them providing fast pre-cooling of antiprotons and rare isotopes. This ring will be also used as an instrument for mass measurements of very short-lived nuclei when tuned to an isochronous mode. The RESR will be used as accumulator of the antiprotons by means of the stochastic cooling technique and as a decelerator of rare isotopes. The structure of the CR and RESR lattices and its ion optical properties are described in this contribution. The beam dynamics of these rings at different operation scenario are discussed.

THPC015	Computational Beam Dynamics Studies for Improving the Ring Injection and Extraction Systems in SNS	scattering, quadrupole, septum, coupling	3008
	J. A. Holmes, S. M. Cousineau, M. A. Plum, J. G. Wang ORNL, Oak Ridge, Tennessee
	The ring injection and extraction systems must function as designed in order for the Spallation Neutron Source (SNS) to achieve its specified performance. In commissioning and early operations we have encountered problems that have been traced to these systems. We experienced high beam losses in and around the injection dump, the rectification of which has necessitated significant study and development by a multidisciplinary team. The results include a number of enhancements of existing features and the addition of new elements and diagnostics. The problem in the extraction region stems from tilted beam distributions observed in the ring-to-target beam transport line (RTBT) and on the target, thus complicating the control of the beam-on-target distribution. This indicates the inadvertant introdution of x-y beam coupling somewhere upstream of the RTBT. The present paper describes computational studies, using the ORBIT Code, addressed at the detailed understanding and solution of these problems.

THPC018	Beam Dynamics Issues in the CLIC Long Transfer Line	ion, electron, emittance, positron	3017
	J. B. Jeanneret, E. Adli, A. Latina, G. Rumolo, D. Schulte, R. Tomas CERN, Geneva
	Both the main beam and the drive beam of the CLIC project must be transported from the central production site to the head of the main linacs over more than twenty kilometres. Over such distances chromatic aberrations are substantial. With long distances and large beam currents, detuning and instabilities associated to ion production and multi-bunch resistive wall effects must also be considered. These effects are quantified and simulated. Based on these results, we propose a baseline design for these two lines.

THPC052	Beam Losses and Collimation Considerations for PS2	collimation, beam-losses, extraction, lattice	3098
	J. Barranco, W. Bartmann, M. Benedikt, Y. Papaphilippou CERN, Geneva
	The high intensity beams with different emittances foreseen to be delivered by the PS2, an upgraded version of the actual CERN Proton Synchrotron, require strict control of beam losses in order to protect the machine components and enable their hands-on maintenance. Beam loss simulations based on dedicated numerical tools are undertaken for a variety of PS2 beams and for different loss mechanisms, along the whole accelerating cycle. In this respect, the design of a collimation system is presented and its performance is compared within different lattice options.

THPC063	First Frequency Maps for Probing the Non-linear Dynamics of SOLEIL	lattice, multipole, quadrupole, insertion	3128
	L. S. Nadolski, P. Brunelle, J.-P. Lavieville, P. Lebasque, A. Nadji, M.-A. Tordeux SOLEIL, Gif-sur-Yvette
	SOLEIL is a 2.75 GeV third generation synchrotron light source delivering photons to beam-lines since January 2007. With a 3.7 nm.rad horizontal emittance, its optics is based on a strong focusing lattice. Large on- and off-momentum apertures are required in order to provide good injection efficiency and as large as possible beam lifetime. It is then fundamental to be able to understand the limitations of these key figures. In order to probe the transverse non linear dynamics two pinger magnets have been installed into the injection straight section during last summer shutdown period. In this paper, their calibration will be described. Then first comparisons between modeled and real machine will be given for betatron tune shifts with amplitudes, and frequency maps. To end the non linear impact of insertion devices on beam dynamics will be discussed.

THPC065	Orbit Stability Status and Improvement at SOLEIL	feedback, power-supply, booster, target	3134
	L. S. Nadolski, J. C. Besson, F. Bouvet, P. Brunelle, L. Cassinari, J.-C. Denard, J.-M. Filhol, N. Hubert, J.-F. Lamarre, A. Loulergue, A. Nadji, D. Pedeau, M.-A. Tordeux SOLEIL, Gif-sur-Yvette
	SOLEIL is a 2.75 GeV third generation synchrotron light source delivering photons to beam-lines since January 2007. Stability of the beam-line source points is crucial for the user experiments. Typically this stability has to be below one tenth of the transverse beam sizes. This is challenging especially in the vertical plane leading to sub-micrometer values. This paper will describe the position stability achieved today without and with the slow orbit feedback. Impact of different noise sources and present limitations will be described. To end an improvement strategy will be given for short and medium terms.

THPC078	Injection Scheme of X-rays Source NESTOR	electron, storage-ring, quadrupole, simulation	3167
	A. Y. Zelinsky, I. M. Karnaukhov, A. Mytsykov, V. L. Skirda NSC/KIPT, Kharkov
	In the paper the injection scheme of the X-ray source NESTOR based on the compact storage ring and Compton scattering is described. It is supposed to inject electron beam through fringe fields of a bending magnet. For final beam deflection electrical inflector on the running wave will be used. The layout of the injection scheme and elements characteristics are presented. The results of simulations of electron beam motion through 3-d fields of electro-magnetic devices of the injection channel are presented.

THPC107	Beam Dynamical Issues of the KEK All-ion Accelerator	ion, vacuum, electron, acceleration	3227
	K. Takayama, T. Adachi, E. Nakamura, H. Someya KEK, Ibaraki
	R&D works to realize an all-ion accelerator (AIA)* capable of accelerating all species of ions with any possible charge state, based on the induction synchrotron concept, which was demonstrated using the KEK 12 GeV-PS in 2006*, are going on at KEK. The KEK AIA, which is a modification of the existing KEK 500 MeV Booster Ring of a rapid cycle synchrotron, may be an injector-free accelerator. An ion beam from the high-voltage terminal of 200 kV is directly injected into the accelerator ring. Several key issues associated with the low energy injection must be addressed. Space-charge limited current due to a small relativistic b and a short life-time due to scattering with the residual molecules and eddy-current induced magnetic fields associated with guide-fields ramping from a low field level are among them. Careful considerations on them suggest that there are significant constrains on the operational performance and gives achievable beam parameters assuming the present parameters of the KEK AIA. K. Takayama, Y. Arakida, T. Iwashita, Y. S himosaki, T. Dixit, K. Torikai, J. of Appl. Phys. 101, 063304 (2007). **K. Takayama et al., Phys. Rev. Lett. 98, 054801 (2007).

THPC121	LHC Transverse Feedback System and its Hardware Commissioning	kicker, feedback, vacuum, damping	3266
	W. Höfle, P. Baudrenghien, F. Killing, Y. A. Kojevnikov, G. Kotzian, R. Louwerse, E. Montesinos, V. Rossi, M. Schokker, E. Thepenier, D. Valuch CERN, Geneva E. V. Gorbachev, N. I. Lebedev, A. A. Makarov, S. Rubtsun, V. Zhabitsky JINR, Dubna, Moscow Region
	A powerful transverse feedback system ('damper') has been installed in LHC. It will stabilise coupled bunch instabilities in a frequency range from 3 kHz to 20 MHz and at the same time damp injection oscillations originating from steering errors and injection kicker ripple. The transverse damper can also be used as an exciter for purposes of abort gap cleaning or tune measurement. The power and low-level systems layout are described along with results from the hardware commissioning. The achieved performance is compared with earlier predictions and requirements for injection damping and instability control. Requirements and first measurements of the performance of the low-level system are summarized. The chosen approach for the low-level system using advanced FPGA technology is very flexible allowing implementation of future upgrades of the signal processing without changing the hardware.

THPC127	Filling of High Current Singlet and Train of Low Bunch Current in SPring-8 Storage Ring	feedback, kicker, betatron, damping	3284
	T. Nakamura, T. Fujita, K. Fukami, K. Kobayashi, C. Mitsuda, M. Oishi, S. Sasaki, M. Shoji, K. Soutome, M. Takao, Y. Taniuchi JASRI/SPring-8, Hyogo-ken T. Ohshima RIKEN/SPring-8, Hyogo Z. R. Zhou USTC/NSRL, Hefei, Anhui
	We performed the storage of high current singlet of 10mA/bunch and a train of bunches of 0.3mA/bunch under the bunch by bunch feedback systems with newly developed bunch current sensitive automatic attenuators with FPGA. The automatic attenuator reduces the signal level of the high current bunch by factor three to five to avoid the saturation of the feedback systems. With this system, the feedback systems suppress horizontal and vertical mode-coupling instabilities and raise the bunch current limit from 3.5mA/bunch to 12mA/bunch, and simultaneously the systems suppress the multi-bunch instabilities by resistive-wall and cavity higher order mode impedances. The improvement of the automatic attenuation system to fit to the final target of the bunch current in the train, 0.06mA/bunch, are being performed. The other problems which limit the filling patterns, such as saturation of the readout electronics of the beam position monitor system and the heating of vacuum components by high current bunches, will be briefly presented.

THPC138	Bunch-by-Bunch Online Diagnostics at HLS	feedback, diagnostics, kicker, storage-ring	3309
	J. H. Wang, Y. B. Chen, L. J. Huang, W. Li, L. Liu, M. Meng, B. Sun, L. Wang, Y. L. Yang, Z. R. Zhou USTC/NSRL, Hefei, Anhui
	The design goal for the bunch-by-bunch analogue transverse feedback system at the Hefei Light Source (HLS) is to cure the transverse coupled bunch instabilities. The prototype implemented bunch-by-bunch feedback in 2006. Then we changed the circuit and replaced some components by ones of higher performance in order to get better effect. Diagnostic techniques are important tools to determine instabilities and to confirm the performance of the feedback systems. In addition to transverse feedback this system can provide online beam diagnostics and analysis in transverse and longitudinal directions. The diagnostic functions can record the response of every bunch while the feedback system manipulates the beam. The experimental results are presented.

THPC144	A Beam Quality Monitor for LHC Beams in the SPS	extraction, dipole, luminosity, pick-up	3324
	G. Papotti CERN, Geneva
	The SPS Beam Quality Monitor (BQM) system monitors the longitudinal parameters of the beam before extraction to the LHC to prevent losses and degradation of the LHC luminosity by the injection of low quality beams. It is implemented in two priority levels. The highest level is related to machine protection, e.g. verifying SPS-LHC synchronization and global beam structure. If the specifications are not met, the beam is dumped in the SPS before extraction. On the second level, individual bunch position, length and stability are checked for beam quality assessment. Tolerances are adapted to the mode of operation and extraction to the LHC can also be inhibited. Beam parameters are accessed by acquiring bunch profiles with a longitudinal pick up and fast digital oscilloscope. The beam is monitored for instabilities during the acceleration cycle and thoroughly checked a few ms before extraction for a final decision on extraction interlock. Dedicated hardware and software components implementing fast algorithms are required. In this paper the fast algorithms and their possible implementations are presented.

THPC145	Reliability Analysis of the LHC Machine Protection System: Terminology and Methodology	simulation, beam-losses, hadron, diagnostics	3327
	S. Wagner Swiss Federal Institute of Technology Zurich (ETH), Laboratory for Safety Analysis, Zurich R. Schmidt, J. Wenninger CERN, Geneva
	The trade-off between LHC machine safety and beam availability is one of the main issues related to the LHC MPS. Several studies have addressed it for different subsystems. They are followed by a project aiming at the development of a methodology which combines agent-based modeling and fault-tree analysis thus allowing a global analysis of the entire MPS. During this project, the need for a clarification and specification of the terminology has become apparent. Besides involving basic terms like safety, reliability and availability, the analysis must take into account the implementation of common design principles such as redundancy, fault tolerance, 'fail-safe' and self-monitoring. These terms and in particular their interrelations easily cause confusion. Since the traceability of the analysis depends on a consistent understanding of the underlying terminology, a terminology frame is being compiled. The paper specifies the most relevant terms and their interrelations. General standard definitions are taken as basis for a specification related to the MPS and its analysis respectively. The developed analysis methodology building on this terminology frame is introduced.

THPC149	Beam Scraping to Detect and Remove Halo in LHC Injection	simulation, proton, beam-losses, controls	3339
	P. A. Letnes, S. Bart Pedersen, A. Brielmann, H. Burkhardt, D. K. Kramer CERN, Geneva
	Fast scrapers are installed in the SPS to detect and remove beam halo before extraction of beams to the LHC, to minimize the probability for quenching of super-conducting magnets in the LHC. We shortly describe the current system and then focus on our recent work, which aims at providing a system which can be used as operational tool for standard LHC injection. A new control application was written and tested with the beam. We describe the current status and results and compare these with detailed simulations.

THPC153	Timing System of the New Elettra Injector	booster, extraction, storage-ring, gun	3351
	S. Bassanese, A. Carniel, R. De Monte, M. Ferianis, G. Gaio ELETTRA, Basovizza, Trieste
	A new timing system has been developed to operate the new injector for the Elettra storage ring. It implements a versatile injection system to support standard and exotic fillings as well as the top-up mode of operation. Based on an in-house developed programmable counter VME board, the system provides all the needed triggers by the pre-injector LINAC, the booster injection, the booster ramping system, the booster extraction, and the SR injection. An overview of the system architecture and functionality is described and the performance of the board is reported. All the trigger signals are distributed to the timing clients by means of optical links.

THPC162	The SSRF Timing System	booster, linac, controls, storage-ring	3369
	L. Y. Zhao, D. K. Liu, C. X. Yin SINAP, Shanghai
	In the Shanghai Synchrotron Radiation Facility (SSRF), various equipment in the 150MeV linac, the full energy booster and the 3.5GeV storage ring need to be triggered and synchronized by a low jitter timing system. An event system based on distribution network is implemented in the SSRF timing system. In this paper, the software and hardware structure of the SSRF timing system are described and the system performance is presented.

THPP004	EMMA - the World's First Non-scaling FFAG	extraction, acceleration, kicker, diagnostics	3380
	T. R. Edgecock STFC/RAL, Chilton, Didcot, Oxon C. D. Beard, J. A. Clarke, C. Hill, S. P. Jamison, A. Kalinin, K. B. Marinov, N. Marks, P. A. McIntosh, B. D. Muratori, H. L. Owen, Y. M. Saveliev, B. J.A. Shepherd, R. J. Smith, S. L. Smith, S. I. Tzenov, E. Wooldridge STFC/DL/ASTeC, Daresbury, Warrington, Cheshire J. S. Berg, D. Trbojevic BNL, Upton, Long Island, New York N. Bliss, C. J. White STFC/DL, Daresbury, Warrington, Cheshire M. K. Craddock UBC & TRIUMF, Vancouver, British Columbia J. L. Crisp, C. Johnstone Fermilab, Batavia, Illinois Y. Giboudot Brunel University, Middlesex E. Keil CERN, Geneva D. J. Kelliher, S. Machida STFC/RAL/ASTeC, Chilton, Didcot, Oxon S. R. Koscielniak TRIUMF, Vancouver F. Meot CEA, Gif-sur-Yvette T. Yokoi OXFORDphysics, Oxford, Oxon
	EMMA - the Electron Model of Many Applications - is to be built at the STFC Daresbury Laboratory in the UK and will be the first non-scaling FFAG ever constructed. EMMA will be used to demonstrate the principle of this type of accelerator and study their features in detail. The design of the machine and its hardware components are now far advanced and construction is due for completion in summer 2009.

THPP005	Orbit Distortion and its Correction in a Non-scaling FFAG	acceleration, quadrupole, closed-orbit, lattice	3383
	D. J. Kelliher, S. Machida STFC/RAL/ASTeC, Chilton, Didcot, Oxon
	The wide variation in betatron tune over a rapid acceleration time presents particular difficulties in orbit correction in a non-scaling FFAG. Due to the fact that the phase advance between an error source and the corrector magnets varies during acceleration, and assuming that the corrector magnets' strengths must be constant during the short acceleration period, it is clear that conventional harmonic correction is ineffective. We propose a method to determine the magnet and BPM misalignments in a non-scaling FFAG. By running the beam at fixed energy over many turns, and assuming no other error sources exist, the BPM measurements allow the misalignments to be calculated (assuming that there are as many BPMs as error sources). We show that it is also possible to calculate the BPM misalignment error if the beam is run at two fixed energies. This is due to a characteristic property of non-scaling FFAGs - the variation of the phase shift, and hence the response of the BPM measurements to magnet misalignments, with momentum. Having estimated the magnet misalignments, a local correction is made and a tracking study carried out to calculate the reduction in orbit distortion that results.

THPP006	Injection and Extraction for the EMMA NS-FFAG	extraction, quadrupole, dipole, diagnostics	3386
	B. D. Muratori, S. L. Smith, S. I. Tzenov STFC/DL/ASTeC, Daresbury, Warrington, Cheshire C. Johnstone Fermilab, Batavia, Illinois
	EMMA (Electron Machine with Many Applications) is a prototype non-scaling electron FFAG to be hosted at Daresbury Laboratory. NS-FFAGs related to EMMA have an unprecedented potential for medical accelerators for carbon and proton hadron therapy. It also represents a possible active element for an ADSR (Accelerator Driven Sub-critical Reactor). This paper will summarize the design of the extraction and injection transfer lines of the NS-FFAG. In order to operate EMMA, the Energy Recovery Linac Prototype (ERLP) shall be used as injector and the energy will range from 10 to 20 MeV. Because this would be the first non-scaling FFAG, it is important that as many of the bunch properties are studied as feasible, both at injection and at extraction. To do this, a complex injection line was designed consisting of a dogleg to extract the beam from ERLP, a matching section, a tomography section and some additional dipoles and quadrupoles to transport the beam to the entrance of EMMA. Further, an equivalent tomography module was placed in the extraction line together with several other diagnostic devices including the possibility of using a transverse deflecting cavity.

THPP007	Six-sector FFAG Ring to Demonstrate Bunch Rotation for PRISM	simulation, closed-orbit, target, vacuum	3389
	A. Sato, M. Aoki, S. Araki, Y. Arimoto, Y. Eguchi, K. Hirota, I. Itahashi, Y. Kuno, Y. Kuriyama, Y. Nakanishi, M. Y. Yoshida Osaka University, Osaka Y. Iwashita Kyoto ICR, Uji, Kyoto A. Kurup Imperial College of Science and Technology, Department of Physics, London Y. Mori KURRI, Osaka C. Ohmori KEK, Ibaraki
	A monochromatic muon beam is one of the most important requirements to improve a sensitivity of mu-e conversion experiments. In the PRISM project, which searches for mu-e conversion at a sensitivity of BR~10^-18, makes such muon beams by using a bunch rotation technique in an FFAG ring. To demonstrate the bunch rotation, a FFAG ring has been constructed in RCNP, Osaka. The ring has six FFAG magnets and one RF cavity. Alpha particles from a radioactive isotope ²⁴¹Am will circulate in the ring for the demonstration of bunch rotation.

THPP009	Injection and Extraction Orbits and Twiss Parameters for the EMMA Ring	extraction, kicker, betatron, focusing	3395
	B. D. Muratori, S. L. Smith, S. I. Tzenov STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
	Using the FFEMMAG code, the injection and extraction orbits for the EMMA ring at a variety of injection and extraction energies together with the Twiss parameters to be used for matching have been calculated. The orbits include two kickers together with a septum at both injection and extraction. The FFEMMAG code has been used in conjunction with several scripts so as to be able to scan the parameter space of the two kicker strengths for a section of the EMMA ring. The results confirm the choice of magnet and vacuum pipe apertures as being adequate to operate EMMA from 10 to 20 MeV.

THPP012	Beam Injection Issues of FFAG for Particle Therapy	proton, controls, target, synchrotron	3401
	T. Yokoi, J. H. Cobb, G. Morgan OXFORDphysics, Oxford, Oxon M. J. Easton, J. K. Pozimski Imperial College of Science and Technology, Department of Physics, London K. J. Peach JAI, Oxford
	Spot scanning irradiation is a next generation treatment scheme of particle therapy. The pulsed beam of FFAG accelerator is well fitted to the treatment. In order to form a uniform dose distribution in the target volume, intensity modulation is a requirement in spot scanning and it requires special consideration in injection in order to realize short time treatment using the pulsed beam of the FFAG. In this paper, injection related issues of NS-FFAG are discussed from the point of particle therapy, especially for spot scanning.

THPP015	Design of a Versatile Injector for a Low-energy Experimental Platform at KACST	ion, ion-source, storage-ring, extraction	3404
	M. O.A. El Ghazaly, A. A. Alzeanidi KACST, Riyadh V. Aleksandrov JINR, Dubna, Moscow Region A. I. Papash MPI-K, Heidelberg C. P. Welsch GSI, Darmstadt
	At the National Centre for Mathematics and Physics (NCMP), at the King Abdulaziz City for Science and Technology (KACST), Saudi Arabia, a multi-purpose low-energy experimental platform is presently being developed in collaboration with the University of Heidelberg, Germany. The aim of this project is to enable a multitude of low-energy experiments with most different kinds of ions both in single pass setups, but also with ions stored in a low-energy electrostatic storage ring. In this contribution, the injector of this complex is presented. It was designed to provide beams with energies up to 30 kV/q and will allow for switching between different ion sources from e.g. duoplasmatron to electrospray ion sources and to thus provide the users with a wide range of different beams. We present the overall layout of the injector with a focus on the optical design and the foreseen diagnostic elements.

THPP048	Experimental Demonstration of Longitudinal Ion Beam Accumulation with Electron Cooling	electron, kicker, ion, bunching	3470
	C. Dimopoulou, B. Franzke, T. Katayama, F. Nolden, G. Schreiber, M. Steck GSI, Darmstadt D. Möhl CERN, Geneva
	Recently, two longitudinal beam compression schemes have been successfully tested in the Experimental Storage Ring (ESR) at GSI with a beam of bare Ar ions at 65 MeV/u injected from the ion synchrotron SIS18. The first employs Barrier Bucket pulses, the second makes use of multiple injections around the unstable fixed point of a sinusoidal RF bucket at h=1. In both cases continuous electron cooling maintains the stack and merges it with the freshly injected bunch . Using the beam diagnostic devices in the ring both stacking processes were demonstrated under the same conditions. The dependence of the accumulation performance on the available rf potential, the electron cooling strength as well as on the synchronization conditions between injection kicker pulse and rf wave was investigated. These experimental results provide the proof of principle for the planned fast stacking of Rare Isotope Beams aiming at high luminosities in the New Experimental Storage Ring * of the FAIR project **. C. Dimopoulou et al., JACoW Proceedings of COOL07, Bad Kreuznach,2007. C. Dimopoulou et al., PRST-AB 10 (2007) 020101. * FAIR Baseline Technical Report,www.gsi.de/fair/.

THPP056	Simulations of Incoherent Vertical Ion Losses and Cooling Stacking Injection	ion, emittance, proton, electron	3494
	E. Syresin JINR, Dubna, Moscow Region
	The cooling stacking injection at a synchrotron is applied to obtain a high intensity of the stored coasting ion beam. The efficiency of cooling-stacking injection is defined mainly by two parameters: the cooling-accumulation efficiency and the ion life time. The life time of new injected ions usually is essentially smaller than the stack life time for high intensive ion beams. The incoherent loses of new injected ions are related to a multi scattering on residual gas atoms and a vertical heating caused by ion stack noise. The short life time of new injected ions restricts the efficiency of the cooling stacking injection The life time of new injected C⁶⁺ ions is shorter by 2 times than stack life time at HIMAC cooling stacking injection. The life time of new injected protons in S-LSR is smaller by 2-3 orders of magnitudes than the stack life time. The analytical estimations and BETACOL simulations of vertical incoherent ion losses and cooling stacking injection are presented.

THPP057	Electron Cooling Experiments at LEIR	electron, ion, controls, gun	3497
	G. Tranquille CERN, Geneva
	The LEIR electron cooler is the first of a new generation of coolers utilising high-perveance variable-density electron beams for the cooling and accumulation of heavy ion beams. It was commissioned at the end of 2005 and has since been routinely used to provide high brightness Pb ion beams required for future LHC ion runs. High perveance, or intensity, is required to rapidly reduce the phase-space dimensions of a newly injected “hot” beam whilst the variable density helps to efficiently cool particles with large betatron oscillations and at the same time improve the lifetime of the cooled stack. In this report we present the results of recent measurements made to check and to better understand the influence of the electron beam size, intensity and density profile on the cooling performance.

THPP065	3D Simulation of the Axial Injection Beam Line of DC350 Cyclotron	cyclotron, simulation, ion, focusing	3509
	N. Yu. Kazarinov, V. Aleksandrov, V. Shevtsov, A. Tuzikov JINR, Dubna, Moscow Region
	DC-350 is the novel cyclotron designed in Flerov Laboratory of Nuclear Reaction of Joint Institute for Nuclear Research. It is intended for the nuclear and applied physics experiments. The axial injection channel of the DC-350 cyclotron gives possibility for transportation of the high intensity ion beam from Li to Bi obtained in the superconducting ECR-ion source (SECR). The beam focusing in the beam line after the analyzing bending magnet is provided by solenoidal lenses. The linear and sinusoidal bunchers installed in the vertical part of the channel are used for increasing of the accelerating efficiency. The 3D simulation results of the focusing and bunching systems of the axial injection beam line are presented.

THPP068	Acceleration in spiral FFAG using field map data	acceleration, extraction, proton, resonance	3515
	J. Pasternak, J. Fourrier LPSC, Grenoble F. Meot CEA, Gif-sur-Yvette
	This paper presents beam dynamics studies regarding the variable energy operation of a spiral scaling FFAG (Fixed Field Alternating Gradient) accelerator designed for producing 70 to 180 MeV protons and acceleration simulations for different operation modes, corresponding to different extraction energies.

THPP071	Construction of Six-sector FFAG Ring for Muon Phase Rotation	power-supply, multipole, alignment, vacuum	3524
	Y. Arimoto, M. Aoki, S. Araki, Y. Eguchi, K. Hirota, I. Hossain, I. Itahashi, Y. Kuno, Y. Kuriyama, Y. Nakanishi, A. Sato, M. Y. Yoshida Osaka University, Osaka Y. Iwashita Kyoto ICR, Uji, Kyoto A. Kurup Imperial College of Science and Technology, Department of Physics, London Y. Mori KURRI, Osaka C. Ohmori KEK, Ibaraki T. Oki Tsukuba University, Ibaraki
	PRISM is a next-generation of muon source which provides high purity, high intense and high brightness beam. In PRISM, a PRISM-FFAG is one of key section which make a muon beam narrow energy width by using phase rotation technique. To demonstrate the phase rotation, a six-cell FFAG ring has been constructed; the ring consists of full size of scaling-FFAG magnets and a high gradient rf cavity. The experiment is achieved by injecting alpha particles from a radioisotope source as a beam. Construction of the ring has been started from September, 2007; beam duct has been designed and installed, the six FFAG magnets has been aligned, etc. In this paper, we will present the design of the ring and the construction (alignment, etc) from engineering point of view.

THPP083	Megawatt Upgrades for the ISIS Facility	linac, synchrotron, target, space-charge	3554
	J. W.G. Thomason, D. J. Adams, D. J.S. Findlay, I. S.K. Gardner, B. Jones, A. P. Letchford, S. J. Payne, B. G. Pine, A. Seville, C. M. Warsop, R. E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon D. C. Plostinar, C. R. Prior, G. H. Rees STFC/RAL/ASTeC, Chilton, Didcot, Oxon
	ISIS is the spallation neutron source at the Rutherford Appleton Laboratory in the UK. Presently, it runs at beam powers of 0.2 MW, with upgrades in place to supply increased powers for the new Second Target Station due to start operation in autumn 2008. This paper outlines schemes for major upgrades to the facility in the megawatt regime, with options for 1, 2 and 5 MW. The ideas centre around new 3.2 GeV RCS designs that can be employed to increase the energy of the existing ISIS beam to provide powers of ~1 MW or, possibly as a second upgrade stage, accumulate and accelerate beam from a new 0.8 GeV linac for 2-5 MW beams. Summaries of ring designs are presented, along with studies and simulations to assess the key loss mechanisms that will impose intensity limitations. Important factors include injection, RF systems, instabilities, longitudinal and transverse space charge.

THPP084	Discussion on RCS versus AR on the Basis of J-PARC Beam Commissioning for Pulsed Spallation Neutron Source	beam-losses, linac, proton, space-charge	3557
	Y. Yamazaki KEK/JAEA, Ibaraki-Ken M. Kinsho JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
	Over a decade it is one of the most controversial issues regarding the accelerator scheme choice whether RCS or AR should be chosen for the pulsed spallation neutron source. In order to simplify the discussion, we compare 3-GeV RCS with 1-GeV AR. The former is J-PARC scheme while the latter is SNS scheme. To summarize the discussion, RCS technology is much more difficult than AR technology, although RCS has many advantages over AR arising from its low beam current for the same beam power. Now, the J-PARC 3-GeV RCS was actually commissioned. On the basis of its experience, the discussion will be resumed.

THPP085	Status of the SNS Ring Power Ramp Up	target, beam-losses, extraction, linac	3560
	M. A. Plum, A. V. Aleksandrov, C. K. Allen, S. M. Cousineau, V. V. Danilov, J. Galambos, J. A. Holmes, D.-O. Jeon, T. A. Pelaia, A. P. Shishlo, Y. Zhang ORNL, Oak Ridge, Tennessee
	Beam was first circulated in the SNS ring in January 2006. Since that time we have been working to raise the beam power to the design value of 1.4 MW. In general the power ramp up has been proceeding very well, but several issues have been uncovered. Examples include poor transmission of the waste beams in the injection dump beam line, cross-plane coupling in the ring to target beam transport line, and higher-than-expected peak densities in the ring to target transport. In this paper we will discuss these issues and present an overall status of the ring and the transport beam lines.

THPP086	Diamond Stripper Foil Experience at SNS and PSR	target, beam-losses, plasma, electron	3563
	R. W. Shaw, Y.-J. Chen, R. L. Coleman, D. M. Gardner, C. Luck, A. G. McDermott, M. A. Plum, L. L. Wilson ORNL, Oak Ridge, Tennessee M. J. Borden, T. Spickermann LANL, Los Alamos, New Mexico C. S. Feigerle University of Tennessee, Knoxville, Tennessee
	The SNS is currently operating at about 15% of the 1.4 MW design power, and the diamond stripper foils developed at ORNL continue to perform well. Several corrugated, nanocrystalline diamond stripping foils have been tested at SNS. Beyond about 300 C of injected charge, significant distortion and darkening of the foils is observed. These foils are currently limited in freestanding area to about 17x25 mm due to stress-induced tears in larger foils; this limit positions the residual silicon wafer mounting handle close enough to the circulating beam that additional losses have been observed. The PSR experience with these diamond foils has been promising, with the interesting observation that both the foil current due to secondary emission of electrons and the thermionic foil current are reduced for diamond foils relative to LANL/KEK foils. For comparable thickness foils, losses due to the Ho yield also appear to be higher for diamond. A recent development in our foil preparation has been a change to nano-seeded nucleation from the earlier microcrystal slurry ultrasonic abrasion technique. This has led to a more reproducible and uniform foil morphology with smaller crystallites.

THPP087	4 GeV H^- Charge Exchange Injection into the PS2	septum, emittance, kicker, proton	3566
	B. Goddard, W. Bartmann, M. Benedikt, A. Koschik, T. Kramer CERN, Geneva
	The proposed PS2 will accelerate protons from 4 to 50 GeV. The required beam intensity and brightness can only be achieved with a multi-turn H^- charge exchange injection system, where the small emittance injected beam is used to paint the transverse phase space of the PS2 machine. This paper describes the constraints and conceptual design of the H^- injection system and its incorporation into the present PS2 lattice. The requirements for the special injection system elements are described, in particular the injection chicane and painting magnet systems and the charge exchange foil. Some key performance aspects are investigated, including the stripping efficiency, expected emittance growth and beam loss arising from the simulated number of multiple foil traversals, together with estimates of foil heating.

THPP088	Design Considerations for the PS2 Beam Dumps	extraction, simulation, kicker, shielding	3569
	T. Kramer, M. Benedikt, B. Goddard, H. Vincke CERN, Geneva
	Studies have been made to evaluate and differentiate necessary beam disposal functions for the proposed PS2 accelerator. The paper describes briefly the different beam dump functionalities required for the PS2 machine and its transfer lines, and makes some first estimates about the expected beam loads. This data has been taken as input for comparing the different technical options for the dump systems, in particular to simulate the radiological impact of different internal or external beam dump concepts. The numbers derived have been used to help in evaluating the feasibility of the technical alternatives.

THPP090	Beam Injection and Extraction of SCENT300, A Superconducting Cyclotron for Hadrontherapy	proton, cyclotron, extraction, emittance	3575
	D. Campo, L. Calabretta, M. M. Maggiore, L. A.C. Piazza INFN/LNS, Catania
	SCENT300 is a superconducting cyclotron able to deliver proton and carbon beam at 260 and 300 AMeV respectively. The simulations of the beam injection through the central region, the beam extraction through the electrostatic deflector for Carbon beam and by stripper foil for the proton beam are here presented.

THPP096	Injection Optimisation on the ISIS Synchrotron	synchrotron, closed-orbit, betatron, simulation	3587
	B. Jones, D. J. Adams, C. M. Warsop STFC/RAL/ISIS, Chilton, Didcot, Oxon
	The ISIS Facility at the Rutherford Appleton Laboratory in the UK produces intense neutron and muon beams for condensed matter research. At its core is a 50 Hz proton synchrotron which, as the commissioning of a new dual harmonic RF system concludes, can accelerate 3.75·10¹³ protons per pulse from 70 to 800 MeV, delivering a mean beam power of 0.24 MW. The multi-turn charge-exchange injection process strongly affects transverse beam distributions, space charge forces and beam loss, which ultimately limits operational intensity. The evolution of longitudinal distributions and subsequent trapping efficiency is also intimately linked with injection. Optimising injection is therefore a key consideration for present and future upgrades. This paper summarises injection studies including 2D space-charge simulations of the ISIS injection process using the ORBIT code. Comparisons of simulation results with measurements for a range of beam intensities are presented and an assessment is made of a correlated painting scheme in contrast to the usual anti-correlated configuration.

THPP105	Beam Commissioning Results of the RCS Injection and Extraction at J-PARC	extraction, emittance, kicker, septum	3611
	P. K. Saha, N. Hayashi, H. Hotchi, F. Noda, Y. Shobuda JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken H. Harada Hiroshima University, Graduate School of Science, Higashi-Hiroshima Y. Irie KEK, Ibaraki
	The beam commissioning of J-PARC (Japan Proton Accelerator Research Complex) 3 GeV RCS (Rapid Cycling Synchrotron) has been started from the end of year 2007. As injection is in the very first stage, an accurate and well controlled beam at the injection strongly related to the other part of the RCS commissioning, including extraction where, an well extracted beam directly reflects the overall commissioning result. In this paper, the beam commissioning results of the RCS injection and extraction will be reported.

THPP112	Leakage Field of Septum Magnets of 3 GeV RCS at J-PARC	septum, extraction, vacuum, proton	3626
	M. Yoshimoto, H. Hotchi, J. Kamiya, M. Kinsho, M. Kuramochi, P. K. Saha, T. Takayanagi, T. Togashi, T. Ueno, M. Watanabe JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken H. Harada Hiroshima University, Graduate School of Science, Higashi-Hiroshima
	Septum magnets are installed in RCS (Rapid cycling Synchrotron) at J-PARC for the beam injection and extraction. In order to realize MW beam in the RCS ring and reduce the beam loss during the beam injection and extraction, the septum magnets have large physical aperture and are operated in DC. Thus there are high magnetic fields in the gaps during the acceleration, but the leakage fields are nevertheless suppressed down to a few Gauss to suppress the closed orbit distortion. In order to reduce the magnetic leakage field from the septa at beam orbit in the RCS ring, the silicon steel sheets are set for magnetic shield. In addition a few ring vacuum chambers are made by the magnetic stainless steel. Up to now, the development and field measurement of the septum magnets has been finished, and the beam commissioning of the RCS are carried out. In this presentation, the field measurements of the septum magnets are summarized and the influences of the leakage field upon the beam orbit are reported.

THPP113	Emittance Growth at LHC Injection from SPS and LHC Kicker Ripple	kicker, emittance, damping, feedback	3629
	B. Goddard, M. J. Barnes, L. Ducimetière, W. Höfle, G. Kotzian CERN, Geneva
	Fast pulsed kicker magnets are used to extract beams from the SPS and inject them into the LHC. The kickers exhibit time-varying structure in the pulse shape which translates into small offsets with respect to the closed orbit at LHC injection. The LHC damper systems will be used to damp out the resulting betatron oscillations, to keep the growth in the transverse emittance within specification. This paper describes the results of the measurements of the kicker ripple for the two systems, both in the laboratory and with beam, and presents the simulated performance of the transverse damper in terms of beam emittance growth. The implications for LHC operation are discussed.

THPP114	LHC Transverse Feedback Damping Efficiency	feedback, damping, simulation, octupole	3632
	G. Kotzian, W. Höfle CERN, Geneva E. Vogel DESY, Hamburg
	A simulation model has been developed to predict the damping efficiency of the LHC transverse feedback system in the presence of coupled bunch instabilities and under realistic assumptions for the injection error. The model tracks both the centre of gravity of a bunch and the r.m.s beam size during and after injection. It includes the frequency characteristic of the transverse feedback system. Nonlinearities in the beam optics will cause the bunches to filament and lead to an increase of the transverse emittance after injection. The resistive wall instability reduces the effectiveness of the transverse feedback by slowing down the damping process. Possibilities for enhancing the performance of the feedback system by signal processing schemes are outlined.

THPP134	Injection and Extraction DC Magnets Power Supplies for 3GeV Rapid Cycling Synchrotron of J-PARC	power-supply, extraction, septum, feedback	3676
	M. Watanabe, J. Kamiya, M. Kinsho, T. Takayanagi, Y. Yamazaki, M. Yoshimoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken K. Hirano JAEA/LINAC, Ibaraki-ken Y. Irie KEK, Ibaraki
	Proton beams have been successfully accelerated to the design energy of 3 GeV in the RCS at the J-PARC. In the injection, dump and extraction sections of the RCS, septum magnets, a quadrupole magnet, dc kicker magnets and steering magnets have been installed and operated at DC. For the septum magnets, there is little space area available for the septum coil and a magnetic shield. Therefore the power supplies are required high excitation current. Maximum currents of the injection and dump septum magnets are less than 7 kA. The extraction septum magnets need the maximum current of 12 kA*. For saving the cost and the installation space of the extraction septum magnets power supplies, a main power supply, which excites three extraction septum magnets in series, and three auxiliary power supplies for adjusting the current to the each magnet are employed. Long-term stability and the current ripples are required to be less than the order of 100 ppm for those power supplies in order to provide the required acceptance for the beams. This presentation shows design and measurements of the the injection and extraction DC power supplies. JAERI Technical Report 2003-044 and KEK Report 2002-13. M. Yoshimoto et al. Proc. of EPAC'06. *M. Watanabe et al. IEEE Transactions on applied superconductivity, Vol.16, No.2, 2006.

FRYAGM01	Upgrade Issues for the CERN Accelerator Complex	luminosity, proton, linac, synchrotron	3734
	R. Garoby CERN, Geneva
	The Large Hadron Collider at CERN is at a very advanced stage of construction and the first beam collisions in the experiments are expected during the year 2008. Work has now started for maximizing its physics reach and for preparing for other foreseeable needs. Beyond upgrades in the LHC itself, mainly in the optics of the insertions, the injector complex has to be renewed to deliver beam with upgraded characteristics with a high reliability. In a first phase, a new 160 MeV H^- linac (“Linac4”) will be built to replace the present 50 MeV proton linac (Linac2) and extensive consolidation will be made. In a second phase, the present 26 GeV PS and its set of injectors (Linac2 + PSB) are planned to be replaced with a ~50 GeV synchrotron (“PS2”) using a 4 GeV superconducting proton linac (“SPL”) as injector. The SPS itself will also be the subject of major improvements, to be able to cope with a 50 GeV injection energy and with beams of much higher brightness. These proposals are described as well as their potential to evolve and fit the needs of future facilities for radioactive ions and/or neutrinos.
	Slides