PAC07 - List of Keywords (kicker)

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kicker

Paper	Title	Other Keywords	Page
MOZAKI03	PEP-II at 1.2·10³⁴/cm²/s Luminosity	luminosity, emittance, vacuum, lattice	37
	J. Seeman Y. Cai, M. K. Sullivan, U. Wienands SLAC, Menlo Park, California
	Funding: Work supported by US DOE contract DE-AC02-76SF00515. For the PEP-II Operation Staff: PEP-II is an asymmetric e⁺e^- collider operating at the Upsilon 4S and has recently set several performance records. The luminosity has reached 1.2x10³⁴/cm²/s and has delivered an integrated luminosity of 910/pb in one day. PEP-II operates in continuous injection mode for both beams boosting the integrated luminosity. The peak positron current has reached 3.0 A of positrons and 1.9 A of electrons in 1732 bunches. The total integrated luminosity since turn on in 1999 has reached over 410/fb. This paper reviews the present performance issues of PEP-II and also the planned increase of luminosity in the near future to over 2 x 10³⁴/cm²/s.
	Slides

MOPAN018	Performance of the New Coupled Bunch Feedback System at HERA-p	feedback, controls, diagnostics, luminosity	185
	M. G. Hoffmann S. Choroba, F. Eints, U. Hurdelbrink, P. Morozov, Y. Nechaev, J. Randhahn, S. Ruzin, S. Simrock, V. Soloviev DESY, Hamburg
	A longitudinal broadband damper system to control coupled bunch instabilities (LMBF) has been installed in the 920~GeV proton accelereator HERA-p at the Deutsches Elektronen-Synchrotron DESY in Q4/2005. The Feedback system was fully automated, in order to relieve the operator from manual control during system operation. During comissioning in Q1/2006 it turned out that the performance goals were reached and the noise is not as much a problem as expected. The proton bunch length is significantly reduced as is the stretching of the bunches over runtime. Without additional damping the bunch length is about 1.5~ns (FWHM) at the beginning of a typical luminosity run. With the new feedback system in operation the bunch length could be decreased to 1.0 ns at best. Although the bunches get longer during the luminosity run, the integrated luminosity gain is thus up to 5%. System optimization points were found in automatic gain adjustment during acceleration ramp, oscillation level triggering and timing of kicker pulse to bunch. We describe the commissioning of the multibunch feedback system and the adjustment procedures. A performace overview after one year of operation is given.

MOPAN036	Longitudinal Feedback System for the Photon Factory	feedback, synchrotron, factory, impedance	233
	T. Obina W. X. Cheng, T. Honda, M. Tobiyama KEK, Ibaraki
	In the KEK-PF, longitudinal coupled-bunch instabilities are suppressed by means of the RF phase-modulation technique during the users operation. This method is very effective not only to suppress the instabilities but also to enlarge the beam lifetime. Together with the feasibility study for top-up operation, bunch-by-bunch feedback system have been developed. A two-port longitudinal kicker based on dafne-type cavity were designed and installed in the storage ring in the summer of 2006. FPGA-based signal processing part is under development based on the KEKB design. As an preliminary test of the longitudinal kicker, a simple mode-feedback system which suppress a specific coupled-bunch mode were tested successfully.

MOPAN048	Design of Injection Pulsed Magnets for SESAME Ring	injection, septum, storage-ring, booster	266
	S. Varnasseri M. M. Shehab, G. Vignola SESAME, Amman
	In this paper the SESAME storage ring injection pulsed magnet system is described. The injection process in the SESAME storage ring requires septum and kicker magnets. In this paper we discuss the geometrical and magnetic field requirements for septum and kicker magnets and present the results obtained from magnetic field analysis and also the optimization of titanium coating for the injection kicker chambers. The final specification for thin septum and injection kickers are also presented.

MOPAN053	Development of Transverse Feedback System and Instabilities Suppress at HLS	feedback, single-bunch, storage-ring, impedance	269
	J. H. Wang J. Cao, L. Ma, J. Yue IHEP Beijing, Beijing Y. B. Chen, L. J. Huang, W. Li, L. Liu, B. Sun, L. Wang, Y. L. Yang, K. Zheng, Z. R. Zhou USTC/NSRL, Hefei, Anhui D. K. Liu, K. R. Ye SINAP, Shanghai
	In order to cure and damp coupled bunch (CB) instabilities, a transverse bunch-by-bunch feedback system is under commission at Hefei Light Source (HLS). In this paper, we introduce the HLS Bunch-by-Bunch measurement system and transverse feedback system. The experiment result in HLS ring is also presented in this paper.

MOPAN056	Development of Digital Transverse Bunch-by-Bunch Feedback System of HLS	feedback, single-bunch, pick-up, damping	278
	Z. R. Zhou Y. B. Chen, L. J. Huang, B. Sun, J. H. Wang, Y. L. Yang, K. Zheng USTC/NSRL, Hefei, Anhui K. Kobayashi, T. Nakamura JASRI/SPring-8, Hyogo-ken
	Funding: Supported by "National 211 Project" To promote the transverse feedback system of HLS, we develop the transverse digital feedback system. The scheme of HLS digital feedback system is presented in this paper, and the primitive digital feedback experiment we have done in HLS is also included in the paper.

MOPAN068	Performance with Lead Ions of the LHC Beam Dump System	ion, proton, extraction, instrumentation	308
	R. Bruce B. Goddard, L. K. Jensen, T. Lefevre, W. J.M. Weterings CERN, Geneva
	The LHC beam dump system must function safely with lead ions. The differences with respect to the LHC proton beams are briefly recalled, and the possible areas for performance concerns discussed, in particular the various beam intercepting devices and the beam instrumentation. Energy deposition simulation results for the most critical elements are presented, and the conclusions drawn for the lead ion operation. The expected performance of the beam instrumentation systems are reviewed in the context of the damage potential of the ion beam and the required functionality of the various safety and post-operational analysis requirements.

MOPAN090	Logging of Operation Data at TLS	injection, booster, feedback, linac	371
	C.-K. Chang H. C. Chen, M. J. Horng, J. A. Li, T. F. Lin, Y. K. Lin, Y.-C. Liu NSRRC, Hsinchu
	The Taiwan Light Source had been Top-Up operation in October 2005 and the beam current had increased to 300mA in early 2006. For normal operation, there are some important parameters of Top-up operation, such as beam stability, filling pattern and injection efficiency etc. These data have to be recorded and to be reference for the accelerator operating. Therefore, a LabVIEW-based data logging system had been developed. The system handles communication with other instruments via Ethernet and IEEE-488 interconnections. In this report, the design concept and the current status are described. The planned improvements are carried out in the future.

MOPAN094	Operation Experiences of the Bunch-by-Bunch Feedback System for TLS	feedback, injection, controls, damping	383
	K. T. Hsu J. Chen, P. C. Chiu, S. Y. Hsu, K. H. Hu, C. H. Kuo, D. Lee NSRRC, Hsinchu
	Severe multi-bunch instabilities are bothered the operation of Taiwan Light Source (TLS) during the operation during 2004 just after SRF system upgrade. FPGA-based bunch-by-bunch feedback system was commissioning during late 2005 and early 2006. Multi-bunch instability in both transverse plans and longitudinal are well control. Delivery up to 400 mA stored beam was demonstrated. Transverse feedback system make low chromaticity operation is possible; this is very helpful to improve injection efficiency which are essential for routine top-up operation. Operation experiences of the bunch-by-bunch feedback system will be summary in this report.

MOPAN108	The FONT4 ILC Intra-train Beam-based Digital Feedback System Prototype	feedback, linear-collider, electron, positron	416
	P. Burrows G. B. Christian, C. I. Clarke, B. Constance, A. F. Hartin, H. D. Khah, C. Perry, C. Swinson, G. R. White JAI, Oxford A. Kalinin STFC/DL/ASTeC, Daresbury, Warrington, Cheshire S. Molloy SLAC, Menlo Park, California
	We present the design of the FONT4 intra-train beam-based digital position feedback system prototype. The system incorporates a fast analogue beam position monitor front-end signal processor, a digital feedback board, and a fast kicker-driver amplifier. The system latency goal is less than 150ns. We report preliminary results of beam tests at the Accelerator Test Facility (ATF) at KEK using electron bunches separated by c. 150ns.

MOPAN109	Turnaround Feed-Forward Correction at the ILC	extraction, damping, septum, linear-collider	419
	A. Kalinin P. Burrows JAI, Oxford
	Funding: The Commission of European Communities under 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899, and by the UK Particle Physics & Astronomy Research Council. The RTML turnaround feed-forward correction scheme, as proposed in the ILC Baseline Configuration Document, is considered. Instabilities in the challenging Damping Ring extraction kicker system may give rise to betatron bunch-by-bunch jitter and position drift across the bunch train. A system is outlined in which the bunch trajectory is measured with an upstream pair of BPMs and corrected with a pair of downstream fast kickers. The beam turnaround time allows signal processing and calculation of the correction. A feed-forward algorithm is formulated and expressions are derived for the main system parameters and procedures: dynamic range, maximal kicker voltage, gain compression error, BPM resolution, system zero offset stability, BPM-to-kicker matrix measurement, feed-forward gain adjustment. This analysis will enable further consideration of system tolerances, and provides a basis for an engineering design.

MOPAN116	An FPGA-Based Bunch-to-Bunch Feedback System at the Advanced Photon Source	feedback, damping, storage-ring, simulation	440
	C. Yao N. P. Di Monte, W. E. Norum ANL, Argonne, Illinois
	Funding: Work supported by U. S. Department of Energy, Office of Basic Energy Sciences, under Contract No. W-31-10⁹-ENG-38. The Advanced Photon Source storage ring has several bunch fill patterns for user operation. The hybrids fill pattern consists of a single bunch with a charge of 16 mA and a bunch train of 56 bunches. Both horizontal and vertical instabilities are observed. Currently chromaticity correction is the only method available to overcome the instability. Beamlife time and injection efficiency suffer because of high sextupole currents. A bunch-to-bunch feedback system is designed to overcome beam instability and reduce the required chromaticity correction. The feedback system is based on an FPGA DSP processor. The signal filtering algorithm is based on the time-domain-least-square method developed at SPring-8. We have just completed the integration of the system. We report the system design and some test results.

MOPAS024	Fast Extraction Kicker for the Accelerator Test Facility	impedance, extraction, simulation, closed-orbit	485
	S. De Santis T. Naito, J. Urakawa KEK, Ibaraki
	Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC0-05CH11231. We present the final results of a study for the design of a fast extraction kicker to be installed in the Accelerator Test Facility ring at KEK. The purpose of this project is to test the technologies to be used in the design of the extraction kickers for the International Linear Collider damping rings. The kicker's rise and fall times are important parameters in the final configuration of the rings, since they constrain the minimum distance between bunches and ultimately define a lower limit for the rings length. We investigated a stripline kicker composed of several 65-cm long sections, grouped in two different locations in the ATF damping ring. An analytical study of the kicker's parameter and extensive computer simulations using Microwave Studio* point out the ambitious requirements on the pulsers, in order to be able to satisfy the design specifications. We also investigated the use of a single kicker module, together with a close orbit bump near the extraction septum. * http://www.cst.com

MOPAS037	New Generation Digital Longitudinal Feedback System for Duke FEL and HIGS Facilities	feedback, storage-ring, synchrotron, electron	518
	Y. Kim M. D. Busch, P. Wang, W. Wu, Y. K. Wu FEL/Duke University, Durham, North Carolina J. Choi, I. S. Ko, I. S. Park PAL, Pohang, Kyungbuk D. Teytelman Dimtel, Redwood City, California
	To increase intensity of the High Intensity Gamma-ray Source (HIGS) which is driven by the Duke storage ring FEL via Compton scattering, stored beam current should be increased. However, high-current multi-bunch operation in the Duke storage ring is limited by strong longitudinal coupled-bunch beam instabilities. To control those instabilities, we have been developing an active longitudinal feedback system which is based on the Integrated Gigasample Processor (iGP) through collaboration with Dimtel, Inc. and Pohang Accelerator Laboratory. In this paper, we report the present status of our longitudinal feedback system.

TUODKI03	Multi-batch Slip Stacking in the Main Injector at Fermilab	injection, simulation, beam-losses, booster	742
	K. Seiya T. Berenc, B. Chase, J. E. Dey, P. W. Joireman, I. Kourbanis, J. Reid Fermilab, Batavia, Illinois
	The Main Injector (MI) is going to use slip stacking scheme for the NuMI neutrino experiment for effectively increasing proton intensity to the NuMI target by about a factor two in a MI cycle. The MI is going to accept 11 pluses at injection energy from the Booster and accelerate them to 120 GeV. By using Slip stacking, two of them are merged into one and sent to Anti-proton production and 9 of them, one single and four doubled density pulses, are going to be sent to the Numi beam line. We have been doing low intensity beam studies with 11 pulses injection and accelerated them with the total intensity of 3·10¹² ppp to 120GeV. We discuss beam loss and technical issues on multi-batch slip stacking.
	Slides

TUXC01	Status of DARHT 2nd Axis Accelerator at the Los Alamos National Laboratory	target, electron, induction, beam-transport	831
	R. D. Scarpetti J. Barraza, C. Ekdahl, E. Jacquez, S. Nath, K. Nielsen, G. J. Seitz LANL, Los Alamos, New Mexico F. M. Bieniosek, B. G. Logan LBNL, Berkeley, California G. J. Caporaso, Y.-J. Chen LLNL, Livermore, California
	This presentation will provide a status report on the 2kA, 17MeV, 2-microsecond Dual-Axis Radiographic Hydrotest electron beam accelerator at Los Alamos National Laboratory, and will cover results from the cell refurbishment effort, commissioning experiments on beam transport and stability through the accelerator, and experiments exercising the beam chopper.
	Slides

TUOAC01	Design and Measurements of a Damping Ring Kicker for the ILC	impedance, damping, pulsed-power, optics	846
	M. J. Barnes G. D. Wait TRIUMF, Vancouver
	Funding: Work supported by a contribution from the National Research Council of Canada. The International Linear Collider (ILC) requires ultra fast kickers for the damping ring. One option requires kickers which must produce pulses of 5 kV magnitude, with 6 ns rise and 6 ns fall time into a 50 Ohm, terminated, matched stripline deflector. The pulse must rise and fall within 12 ns. The pulse magnitude must be repeatable to a high accuracy. This paper describes a novel design for a suitable pulse generator for the damping ring kicker, in which 2 stacks of 1kV FETS are combined to generate the fast pulses. The design concept uses 2 parallel 100 Ω drivers combined to provide a 50 Ω driver. The need for 3 MHz burst mode operation for 1 ms at 5 Hz (or 10 Hz) gives an average rep rate of 15 kHz (or 30 kHz). Measurements and calculations are presented on the present state of the TRIUMF prototype pulse generator.
	Slides

TUZAC03	LHC Machine Protection	extraction, injection, beam-losses, dumping	878
	R. Schmidt R. W. Assmann, E. Carlier, B. Dehning, R. Denz, B. Goddard, E. B. Holzer, V. Kain, B. Puccio, B. Todd, J. A. Uythoven, J. Wenninger, M. Zerlauth CERN, Geneva
	This paper addresses the imposing challenges of the LHC Machine Protection System.
	Slides

TUPMN015	First Commissioning Results of the Metrology Light Source	electron, storage-ring, injection, radiation	947
	J. Feikes M. Abo-Bakr, T. Birke, J. Borninkhof, P. Budz, K. B. Buerkmann-Gehrlein, R. Daum, O. Dressler, V. Duerr, F. Falkenstern, H. G. Glass, H. G. Hoberg, J. Kolbe, J. Kuszynski, R. Lange, I. Mueller, R. Muller, J. Rahn, G. Schindhelm, T. Schneegans, Th. Schroeter, D. Schueler, E. Weihreter, G. Wuestefeld BESSY GmbH, Berlin G. Brandt, R. Fliegauf, A. Hoehl, R. Klein, R. Muller, R. Thornagel, G. Ulm PTB, Berlin
	Funding: Physikalisch-Technische Bundesanstalt, Abbestr. 2 - 12, 10587 Berlin, Germany The Physikalisch-Technische Bundesanstalt (PTB), the German national metrology institute, has built an electron storage ring in close cooperation with BESSY for energies between 200 MeV and 600 MeV. This storage ring, named Metrology Light Source (MLS), will mainly be used for radiometry and can be operated as a primary source standard. The spectral range of the MLS is optimized for UV, EUV and also for Terahertz radiation. Commissioning is planed for May 2007. First MLS commissioning results will be reported.

TUPMN032	The New Elettra Booster Injector	controls, booster, dipole, quadrupole	983
	M. Svandrlik S. Bassanese, A. Carniel, K. Casarin, D. Castronovo, P. Craievich, G. D'Auria, R. De Monte, P. Delgiusto, S. Di Mitri, A. Fabris, R. Fabris, M. Ferianis, F. Giacuzzo, F. Iazzourene, G. L. Loda, M. Lonza, F. M. Mazzolini, D. M. Molaro, G. Pangon, C. Pasotti, G. Penco, L. Pivetta, L. Rumiz, C. Scafuri, G. Tromba, A. Vascotto, R. Visintini, D. Zangrando ELETTRA, Basovizza, Trieste L. Picardi, C. Ronsivalle ENEA C. R. Frascati, Frascati (Roma)
	The new full energy injector for Elettra is under construction. The complex is made of a 100 MeV linac and a 2.5 GeV synchrotron, at 3 Hz repetition rate. With the new injector top-up operation shall be feasible. In the first semester of 2007 the machine assembly has been performed. In Summer 2007 the commissioning is scheduled, while in Fall 2007 the connection to the Storage Ring is planned. The status of the project will be reported in this paper.

TUPMN061	An Upgrade Proposal of Injection Bump System for HLS	injection, simulation, emittance, storage-ring	1067
	L. Wang G. Feng, W. Li, L. Liu, H. Xu USTC/NSRL, Hefei, Anhui S. C. Zhang USTC, Hefei, Anhui
	The current injection bump system of Hefei Light Source was designed eight years ago, and operated five years ago. In this paper, the advantages and shortcomings of current bump system were analyzed, and reasonalbe design objective was summed up. According to new design goal, a new physical design of bump system for HLS ring was completed. The acceptance of injected beam and perturbation on stored beam were analyzed. At same time, the ELEGANT software was used to simulate the injection process under new designed bump system. The results showed that, with new designed bump system, the injection rate would be higher than 90%, and the perturbation on orbit of stored beam would be small enough.

TUPMN093	A Kilohertz Picosecond X-Ray Pulse Generation Scheme	synchrotron, storage-ring, photon, damping	1133
	W. Guo M. Borland, K. C. Harkay, C.-X. Wang, B. X. Yang ANL, Argonne, Illinois
	The duration of the x-ray pulse generated at a synchrotron light source is typically tens of picoseconds. Shorter pulses are highly desired by the users. In electron storage rings, the vertical beam size is usually orders of magnitude less than the bunch length due to radiation damping; therefore, a shorter pulse can be obtained by slitting the vertically tilted bunch. Zholents proposed tilting the bunch using rf deflection. We found that tilted bunches can also be generated by a dipole magnet kick. A vertical tilt is developed after the kick in the presence of non-zero chromaticity. The tilt was successfully observed and a 4.2-ps pulse was obtained fom a 27-ps electron bunch at the Advanced Photon Source. Based on this principle we propose a short-pulse generation scheme that produces picosecond x-ray pulses at a repetition rate of 1~2 kHz, which can be used for pump-probe experiments. The tilt phenomenon can also be utilized for machine parameter measurement.

TUPMN115	Creating a Pseudo Single Bunch at the ALS	closed-orbit, single-bunch, storage-ring, resonance	1182
	G. J. Portmann K. M. Baptiste, W. Barry, J. Julian, S. Kwiatkowski, L. Low, D. W. Plate, D. Robin LBNL, Berkeley, California
	Funding: This work was supported by U. S. Department of Energy under Contract No. DE-AC03-76SF00098. Typically storage ring light sources operate with the maximum number of bunches as possible with a gap for ion clearing. By evenly distributing the beam current the overall beam lifetime is maximized. The Advanced Light Source (ALS) has 2 nanoseconds between the bunches and typically operates with 276 bunches out of a possible 328. For experimenters doing timing experiment this bunch separation is too small and would prefer to see only one or two bunches in the ring. In order to provide more flexible operations and substantially increase the amount of operating time for time-of-flight experimenters, it is being proposed to kick one bunch on a different vertical closed orbit. By spatially separating the light from this bunch from the main bunch train in the beamline, one could potentially have single bunch operation all year round. By putting this bunch in the middle of the ion clearing gap the required bandwidth of the kicker magnets is reduced. Using one kicker magnet running at the ring repetition rate (1.5 MHz), this bunch could be permanently put on a different closed orbit. Using multiple kicker magnets, this bunch could be locally offset at an arbitrary frequency.

TUPAN004	Slow Kicker Magnet System with Energy Recover Pulse Power Supply with Extended Flat Top	power-supply, controls, proton, synchrotron	1395
	P. A. Elkiaer S. L. Birch, E. P. Quinn, S. P. Stoneham STFC/RAL/ISIS, Chilton, Didcot, Oxon C. E. Hansen, N. Hauge, C. Nielsen, E. Steinmann Danfysik A/S, Jyllinge A. Morris STFC/RAL/ASTeC, Chilton, Didcot, Oxon
	Danfysik has developed a novel Slow Kicker Magnet Power Supply ERMPPS with associated magnet achieving high stability, long flatness top and low energy consumption. Two Slow Kicker Magnet Systems has been built to RAL, one low and one high energy supply. The magnets are laminated window frame type. The RAL synchrotron produces high energy protons at 50 Hz rate. The Slow Kickers operate at 10 Hz, directing a portion of the extracted protons to a second beam line. The flat top width is 600 μs with a flat top and peak-peak stability better than 100 ppm. The rise and fall time is 12 msec. The power supply has been developed with following highlights: High accuracy with adjustable output current, wide range micro-step set able flattop and rise time width, energy recovery, digital flattop and rise time regulation loop in FPGA and variable repetition frequency down to one shoot operation. The flat top- and rise time width settings are bounded by the actual load and internal component values. The paper describes power supply topology, the digital regulation principia and the magnet construction. Performance measurements electrical as well as magnetic measurements are presented.

TUPAN015	Ion Optical Layout of the FAIR Synchrotron and Beam Line Systems	extraction, lattice, dipole, septum	1422
	J. Stadlmann K. Blasche, B. Franczak, F. Hagenbuck, C. Omet, N. Pyka, S. Ratschow, P. J. Spiller GSI, Darmstadt A. D. Kovalenko JINR, Dubna, Moscow Region
	The ion-optical layout of the two main synchrotrons and the high energy beam transport system of the FAIR project is summarized. SIS100 will be used to generate high intensity beams of all ion species from protons to uranium with a maximum rigidity of 100 Tm. The ion optical layout is optimized for the operation with heavy ions of medium charge states. For this purpose we developed a new ion optical design which provides a separation of the ionized beam particles from the circulating beam in each lattice cell. The chosen lattice structure provides a peaked loss distribution and enables the suppression of beam loss induced pressure bumps. Furthermore a compact layout of the extraction systems for slow and fast extraction at 100 Tm and 300 Tm has been developed. Since both synchrotrons are situated in the same tunnel, the SIS300 ion optical layout has to match the geometrical shape of the SIS100 precisely - although both rings use different lattice structures. The design of the beam transport system allows an effective parallel operation of the two synchrotrons, storage rings and experiments of the FAIR complex.

TUPAN036	DAPHNE Upgrade: A New Magnetic and Mechanical Layout	vacuum, quadrupole, dipole, interaction-region	1466
	S. Tomassini D. Alesini, A. Beatrici, A. Clozza, E. Di Pasquale, G. Fontana, F. Marcellini, G. Mazzitelli, M. Paris, P. Raimondi, C. Sanelli, G. Sensolini, F. Sgamma, M. Troiani, M. Zobov, A. Zolla INFN/LNF, Frascati (Roma) M. E. Esposito Rome University La Sapienza, Roma
	The DAPHNE Phi-Factory upgrade, foreseen for the Siddharta detector run in 2007, will require a new magnetic and mechanical layout to exploit the "large crossing angle" and "crabbed waist" concepts. New permanent quadrupole magnets and aluminium vacuum chamber with thin window have been designed for the new interaction region, with the aim to reuse at maximum the present magnetic and vacuum chamber components. A vacuum chamber of novel design will allow separating the beams at the second interaction region. Designs and results for the new layout will be presented. DAPHNE Upgrade Team, "DAPHNE Upgrade for Siddharta run", DAPHNE Tech. Note G-68, Dec. 2006.

TUPAN046	A Modification Plan of the KEK 500MeV Booster to an All-ion Accelerators (An Injector-free Synchrotron)	ion, acceleration, extraction, injection	1490
	E. Nakamura T. Adachi, Y. Arakida, T. Iwashita, M. Kawai, T. Kono, H. Sato, Y. Shimosaki, K. Takayama, M. Wake KEK, Ibaraki T. S. Dixit GUAS/AS, Ibaraki S. I. Inagaki Kyushu University T. Kikuchi Utsunomiya University, Utsunomiya K. Okazaki Nippon Advanced Technology Co. Ltd., Ibaraki-prefecture K. T. Torikai NIRS, Chiba-shi
	A medium-energy synchrotron capable of accelerating all ion species based on a novel technology of the induction synchrotron* has been proposed as an all-ion accelerator (AIA). The AIA without any specific injector employs a strong focusing lattice and induction acceleration, driven by novel switching power supplies. All ions, including cluster ions with any charge state, are accelerated in a single accelerator. A plan to modify the existing KEK 500 MeV Booster to the AIA is under consideration. Its key aspects, such as an ion-source, a low-field injection scheme and induction acceleration, are described. Deep implant of moderate-energy heavy ions provided from the AIA into various materials may create a new alloy in bulk size. Energy deposition caused by the electro-excitation associated with passing of swift ions through the material is known to largely modify its structure. The similar irradiation on metal in a small physical space of less than a mm in diameter and in a short time period less than 100 nsec is known to create a particularly interesting warm dense-matter state. The AIA capable is a quite interesting device as a driver to explore these new paradigms. K. Takayama, et al., "Experimental Demonstration of the Induction Synchrotron", PAC07. K. Takayama, et al., PCT/JP2006/308502 (2006).* T. Dixit, et al., PAC07.

TUPAN052	New Beam Optics Design of Injection/Fast Extraction/Abort Lines of J-PARC Main Ring	extraction, injection, quadrupole, beam-losses	1508
	M. Tomizawa A. Y. Molodozhentsev, E. Nakamura, I. Sakai, M. Uota KEK, Ibaraki
	J-PARC Main Ring has three straight sections for injection, slow extraction and fast extraction. Injection line has been redesigned so as to give a higher reliability for the thin septa. The magnetic field can be reduced by adding an extra kicker. New optics for the fast extraction with a larger acceptance has been proposed. In this design, the thin septa are replaced by kickers with a large aperture. Beam with an arbitrary energy can be aborted from opposite side from the fast extraction. An external abort line has been designed to deliver the beam aborted with an arbitrary energy to a dump just by using a static quadrupole doublet for the focus.

TUPAN086	An Improved Beam Screen for the LHC Injection Kickers	impedance, coupling, vacuum, injection	1574
	M. J. Barnes F. Caspers, L. Ducimetiere, N. Garrel, T. Kroyer CERN, Geneva
	The two LHC injection kicker magnet systems must produce a kick of 1.3 T.m with a flattop duration variable up to 7860 ns, and rise and fall times of less than 900 ns and 3000 ns, respectively. Each system is composed of two resonant charging power supplies and four 5 Ω transmission line kicker magnets with matched terminating resistors and pulse forming networks. A beam screen is placed in the aperture of the magnets: the screen consists of a ceramic tube with conductors on the inner wall. The conductors provide a path for the image current of the, high intensity, LHC beam and screen the ferrite against Wake fields. The conductors initially used gave adequately low beam impedance however inter-conductor discharges occurred during pulsing of the magnet: an alternative design was discharge free at the nominal operating voltage but the beam impedance was too high for the ultimate LHC beam. This paper presents the results of a new development undertaken to meet the often conflicting requirements for low beam impedance, shielding of the ferrite, fast field rise time and good electrical behaviour. High voltage test results and thermal measurements are also presented.

TUPAN094	PS2 Injection, Extraction and Beam Transfer Concepts	extraction, injection, septum, ion	1598
	B. Goddard W. Bartmann, M. Benedikt, A. Koschik, T. Kramer CERN, Geneva
	The replacement of CERN's existing 26 GeV Proton Synchrotron (PS) machine with a separated-function synchrotron PS2 has been identified as an important part of the possible future upgrade programme of the CERN accelerator complex. The PS2 will require a number of new beam transfer systems associated with injection, extraction, beam dumping and transfer. The different requirements are briefly presented, together with an overview of the conceptual design of these systems, based on the initial PS2 parameter set. The required equipment sub-system performance is derived and discussed. Possible limitations are analysed and the impact on the overall design and parameter set is discussed.

TUPAN096	High Intensity Commissioning of the SPS LSS4 Extraction for CNGS	extraction, beam-losses, radiation, proton	1604
	V. Kain E. Carlier, E. H.R. Gaxiola, B. Goddard, M. Gourber-Pace, E. Gschwendtner, M. Meddahi, H. Vincke, H. Vincke, J. Wenninger CERN, Geneva
	The fast extraction in SPS LSS4 serves both the anti-clockwise ring of the LHC and the CERN Gran Sasso Neutrino facility (CNGS). The latter requires 2 fast extractions of 10.5 microsecond long batches per cycle, 50 milliseconds apart. Each batch will consist of 2.4·10⁺¹³ protons at 400 GeV, a factor of 10 in energy density above the equipment damage limit in case of beam loss. Active and passive protection systems are in place to guarantee safe operation and to respect the radiation limits close to the extraction region. In summer 2006 CNGS was commissioned including extraction with high intensity. A thorough setting-up of the extraction was performed as part of the CNGS commissioning, including aperture and beam loss measurements, and defining and checking of interlock thresholds for the extraction trajectory, magnet currents, kicker voltage and beam loss monitors. The various systems and the associated risks are discussed, the commissioning results are summarised and a comparison is made with predictions from simulations.

TUPAN097	Studies of Beam Losses from Failures of SPS Beam Dump Kickers	simulation, extraction, target, beam-losses	1607
	T. Kramer G. Arduini, O. E. Berrig, E. Carlier, L. Ducimetiere, B. Goddard, A. Koschik, J. A. Uythoven CERN, Geneva
	The SPS beam dump extraction process was studied in detail to investigate the possibility of operation with reduced kicker voltage and to fully understand the trajectory and loss pattern of the mis-kicked beams. This paper briefly describes the SPS beam dump process, and presents the tracking studies carried out for failure cases. The simulation results are compared to the results of measurements made with low intensity beams.

TUPAN098	Beam Commissioning of the SPS LSS6 Extraction and TT60 for LHC	extraction, controls, septum, instrumentation	1610
	B. Goddard B. Balhan, E. H.R. Gaxiola, M. Gourber-Pace, L. K. Jensen, V. Kain, A. Koschik, T. Kramer, J. A. Uythoven, H. Vincke, J. Wenninger CERN, Geneva
	The new fast extraction system in LSS6 of the SPS and the first 100 m of transfer line TT60 was commissioned with low intensity beam in late 2006. The layout and functionality of the main elements are briefly explained, including the various hardware subsystems and the control system. The systems safety procedures, test objectives and measurements performed during the beam commissioning are described.

TUPAS038	The Concept Design of a New Transfer Line from Booster to Recycler for the Fermilab Proton Plan Phase 2 Campaign	injection, booster, emittance, lattice	1727
	D. E. Johnson M. Xiao Fermilab, Batavia, Illinois
	Funding: Work supported by URA under contract No. DEAC02-76CH03000 with the U. S.Dept. of Energy. Upon the termination of the Fermilab Collider program, the current Recycler anti-proton storage ring will be converted to a proton pre-injector for the Main Injector synchrotron. This is scheduled to increase the beam power for the 120 GeV Neutrino program to upwards of 700KW. A transport line that can provide direct injection from the Booster to the Recycler while preserving direct injection from the Booster into the Main Injector and the 8 GeV Booster Neutrino program will be discussed,and its concept design will be presented.

TUPAS039	The Concept Design of a Transfer Line from the Recycler to the Main Injector for the Fermilab Nova Project	extraction, proton, lattice, closed-orbit	1730
	M. Xiao D. E. Johnson Fermilab, Batavia, Illinois
	Funding: Work supported by URA under contract No. DEAC02-76CH03000 with the U. S.Dept. of Energy. Upon the termination of the Fermilab Collider program, the current Recycler anti-proton storage ring will be converted to a proton pre-injector for the Main Injector synchrotron. This is scheduled to increase the beam power for the 120 GeV Neutrino program to upwards of 700KW. Due to momentum aperture restriction, a new transport line that extracts the beam from the Recycler at a dispersion free region to the main injector will be discussed, and its concept design will be presented.

WEXAB02	Critical R&D Issues for the ILC Damping Rings and New Test Facilities	damping, emittance, electron, wiggler	1945
	A. Wolski
	The damping rings for the International Linear Collider will be required to accept large beams from the electron and positron sources, and produce highly stable, very low emittance beams for tuning and operation of downstream systems. While many of the parameters for the damping rings are within range of storage rings presently operating, beams meeting the full quality and stability specifications have not been demonstrated. In addition, the requirements for some of the subsystems (for example, the injection and extraction kickers) push the limits of available technology. We discuss the principal goals and challenges of the damping rings research and development program, and the role that could be played by some proposed future damping rings test facilities.
	Slides

WEXAB03	ATF Results and ATF-II Plans	damping, extraction, emittance, laser	1950
	J. Urakawa
	The ATF (Accelerator Test Facility at KEK) International collaboration has been launched formally under the MoU (Memorandum of Understanding) from August 1, 2005, so as to maximally contribute to the world design and development efforts in the areas of particle sources, damping rings, beam focusing and beam instrumentation towards the International Linear Collider (ILC) project. I will give a talk on the recent ATF results and future plans of ATF2 project. I am sure that ATF International collaboration group will give a right direction regarding the development of fast kicker for ILC damping ring and clear experimental results on fast ion instability with very flat beam. Several considerations for ATF-II beam commissioning strategy will be discussed with the explanation of the beam instrumentation.
	Slides

WEYC02	Stochastic Cooling of High-Energy Bunched Beams	simulation, pick-up, emittance, ion	2014
	M. Blaskiewicz J. M. Brennan, F. Severino BNL, Upton, Long Island, New York
	Funding: Work supported by U. S. DOE under contract No DE-AC02-98CH1-886 Stochastic cooling of 100 GeV/nucleon bunched beams has been achieved in the Relativistic Heavy Ion Collider (RHIC). The physics and technology of the longitudinal cooling system are discussed, and plans for a transverse cooling system are outlined.
	Slides

WEPMN068	Design of the Modulator for the CTF3 Tail Clipper Kicker	impedance, beam-losses, damping, cathode	2185
	M. J. Barnes T. Fowler, G. Ravida CERN, Geneva A. Ueda KEK, Ibaraki
	The goal of the present CLIC test facility (CTF3) is to demonstrate the technical feasibility of specific key issues in the CLIC scheme. The extracted beam from the combiner ring (CR), of 35 A in magnitude and 140 ns duration, is sent to the new CLic EXperimental area (CLEX) facility. A Tail Clipper (TC) is required, in the CR to CLEX transfer line, to allow the duration of the extracted beam pulse to be adjusted. It is proposed to use a stripline kicker for the tail clipper, with each of the deflector plates driven to equal but opposite potential. The tail clipper kick must have a fast rise-time, of not more than 5 ns, in order to minimize uncontrolled beam loss and operate at a rate of up to 50 Hz. Several different options are being investigated to meet the demanding specifications for the modulator of the tail clipper. This paper discusses options considered for the fast, high voltage, semiconductor switches and shows results of initial tests on the switches.

WEPMN069	Low Power Measurements on an AGS Injection Kicker Magnet	impedance, injection, proton, simulation	2188
	M. J. Barnes G. D. Wait TRIUMF, Vancouver
	Funding: Work supported by a contribution from the Canada Foundation for Innovation. The present AGS injection kickers at A5 location were designed for 1.5 GeV proton injection. Recent high intensity runs have pushed the transfer kinetic energy to 1.94 GeV, but with an imperfect matching in transverse phase space. Space charge forces result in both fast and slow beam size growth and beam loss as the size exceeds the AGS aperture. An increase in the AGS injection energy to 2 GeV with adequate kick strength would greatly reduce the beam losses making it possible to increase the intensity from 70 TP (70 * 10¹² protons/s) to 100 TP. R&D studies* have been undertaken by TRIUMF, in collaboration with BNL, to design two new kicker magnets for the AGS A10 location to provide an additional kick of 1.5 mrad to 2 GeV protons. TRIUMF has designed and built a prototype 12.5 Ω transmission line kicker magnet with rise and fall times of 100 ns, 3% to 97% and field uniformity of (±)1% over 85% of the aperture, powered by matched 12.5 Ω pulse-forming lines. This paper describes the results of detailed capacitance and inductance measurements, on the prototype magnet, and compares these with predictions from 2D and 3D electromagnetic simulations. *L. Ahrens, R. B. Armenta, M. J. Barnes, E. W Blackmore, C. J. Gardner, O. Hadary, G. D. Wait, W. Zhang, "Design Concept for AGS Injection Kicker Upgrade to 2 GeV", PAC 2005, Knoxville Tennessee.

WEPMS020	Commissioning the DARHT-II Scaled Accelerator	target, electron, emittance, simulation	2373
	C. Ekdahl E. O. Abeyta, P. Aragon, R. Archuleta, R. Bartsch, D. Dalmas, S. Eversole, R. J. Gallegos, J. Harrison, E. Jacquez, J. Johnson, B. T. McCuistian, N. Montoya, S. Nath, D. Oro, L. J. Rowton, M. Sanchez, R. D. Scarpetti, M. Schauer, G. J. Seitz LANL, Los Alamos, New Mexico H. Bender, W. Broste, C. Carlson, D. Frayer, D. Johnson, A. Tipton, C.-Y. Tom NSTec, Los Alamos, New Mexico M. E. Schulze SAIC, Los Alamos, New Mexico
	The DARHT-II accelerator will produce a 2-kA, 17-MeV beam in a 1600-ns pulse when completed this summer. After exiting the accelerator, the long pulse will be sliced into four short pulses by a kicker and quadrupole septum and then transported for several meters to a tantalum target for conversion to bremsstrahlung for radiography. In order to provide early tests of the kicker, septum, transport, and multi-pulse converter target we assembled a short accelerator from the first available refurbished cells, which are now capable of operating of operating at over 200 kV. This scaled accelerator was operated at ~ 8 Mev and ~1 kA, which provides a beam with approximately the same nu/gamma as the final 17-MeV, 2-kA beam, and therefore the same beam dynamics in the downstream transport. In this presentation we will show the results of beam measurements made during the commissioning of this scaled accelerator.

WEPMS024	Upgrades to the DAHRT Second Axix Induction Cells	vacuum, induction, target, cathode	2385
	K. Nielsen J. Barraza, M. Kang LANL, Los Alamos, New Mexico F. M. Bieniosek, K. Chow, W. M. Fawley, E. Henestroza, L. R. Reginato, W. L. Waldron LBNL, Berkeley, California R. J. Briggs, B. A. Prichard SAIC, Alamo, California T. E. Genoni, T. P. Hughes Voss Scientific, Albuquerque, New Mexico
	The Dual-Axis Radiographic Hydrodynamics Test (DARHT) facility will employ two perpendicular electron Linear Induction Accelerators to produce intense, bremsstrahlung x-ray pulses for flash radiography. The second axis, DARHT II, features a 3-MeV injector and a 15-MeV, 2-kA, 1.6-microsecond accelerator consisting of 74 induction cells and drivers. Major induction cell components include high flux swing magnetic material (Metglas 2605SC) and a MycalexTM insulator. The cell drivers are pulse forming networks (PFNs). The DARHT II accelerator cells have undergone a series of test and modeling efforts to fully understand their operational parameters. Physical changes in the cell oil region, the cell vacuum region, and the cell drivers, together with different operational and maintenance procedures, have been implemented in the prototype. A series of prototype acceptance tests have demonstrated that the required cell lifetime is met at the increased performance levels. Shortcomings of the original design are summarized and improvements to the design, their resultant enhancement in performance, and various test results are discussed.

WEPMS092	A Simplified Approach to Analyze and Model Inductive Voltage Adder	impedance, simulation, linac, pulsed-power	2553
	W. Zhang W. Eng, C. Pai, J. Sandberg, Y. Tan, Y. Tian BNL, Upton, Long Island, New York
	Funding: Work performed under auspices of U. S. Departemnt of Energy. We have recently developed a simplified model and a set of simple formulas for inductive voltage adder design. This model reveals the relationship of output waveform parameters and hardware designs. A computer simulation has demonstrated that parameter estimation based on this approach is accurate as compared to an actual circuit. This approach can be used in early stages of project development to assist feasibility study, geometry selection in engineering design, and parameter selection of critical components. In this paper, we give the deduction of a simplified model. Among the estimation formulas we present are those for pulse rise time, system impedance, and number of stages. Examples are used to illustrate the advantage of this approach. This approach is also applicable to induction LINAC design.

THOBAB02	Commissioning the DARHT-II Scaled Accelerator Downstream Transport	target, quadrupole, septum, dipole	2627
	M. E. Schulze E. O. Abeyta, P. Aragon, R. Archuleta, J. Barraza, D. Dalmas, C. Ekdahl, K. Esquibel, S. Eversole, R. J. Gallegos, J. Harrison, E. Jacquez, J. Johnson, P. S. Marroquin, B. T. McCuistian, N. Montoya, S. Nath, L. J. Rowton, R. D. Scarpetti, M. Schauer LANL, Los Alamos, New Mexico R. Anaya, G. J. Caporaso, F. W. Chambers, Y.-J. Chen, S. Falabella, G. Guethlein, J. F. McCarrick, B. A. Raymond, R. A. Richardson, J. A. Watson, J. T. Weir LLNL, Livermore, California H. Bender, W. Broste, C. Carlson, D. Frayer, D. Johnson, A. Tipton, C.-Y. Tom NSTec, Los Alamos, New Mexico T. C. Genoni, T. P. Hughes, C. H. Thoma Voss Scientific, Albuquerque, New Mexico
	The DARHT-II accelerator will produce a 2-kA, 17-MeV beam in a 1600-ns pulse when completed this summer. After exiting the accelerator, the long pulse is sliced into four short pulses by a kicker and quadrupole septum and then transported for several meters to a tantalum target for conversion to bremsstrahlung for radiography. We describe tests of the kicker, septum, transport, and multi-pulse converter target using a short accelerator assembled from the first available refurbished cells, which are now capable of operating of operating at over 200 kV. This scaled accelerator was operated at ~ 8 Mev and ~1 kA, which provides a beam with approximately the same nu/gamma as the final 17-MeV, 2-kA beam, and therefore the same beam dynamics in the downstream transport. The results of beam measurements made during the commissioning of this scaled accelerator downstream transport are described.
	Slides

THPMN028	Development of the Strip-line Kicker System for ILC Damping Ring	extraction, power-supply, damping, electromagnetic-fields	2772
	T. Naito H. Hayano, K. Kubo, M. Kuriki, N. Terunuma, J. Urakawa KEK, Ibaraki
	The performance of the kicker system for the International Linear collider(ILC) is the one of the key component to determine the damping ring(DR) circumference and the train structure. The parameters are discussing at the baseline configuration design for the ILC. The bunch trains in the linac are 2820(5640) bunches with 308(154) ns spacing and the repetition rate is 5Hz. The bunch spacing in the DR is 6(3) ns. The kicker has to have fast rise and fall times of 6(3) ns and the repetition rate of 3.25(6.5) MHz. The development work of the kicker system using multiple strip-lines is carried out at KEK-ATF. The beam test result of the single unit is described. Also Experimental results on new scheme to improve the rise and fall times will be presented.

THPMN082	Beam Injection Into EMMA Non-scaling FFAG	injection, septum, extraction, acceleration	2898
	T. Yokoi S. Machida STFC/RAL/ASTeC, Chilton, Didcot, Oxon
	FFAG accelerators have been getting attention as promising candidates for the muon accelerators of a neutrino factory due to their large transverse acceptance and the capability of fast particle acceleration. Non-scaling FFAGs, which are a variation of FFAGs, are nowadays being intensively studied for their simple structure and operational flexibility. To demonstrate the technical feasibility of non-scaling FFAGs and to investigate their beam dynamics, a project to construct a small electron non-scaling FFAG (EMMA) has been proposed in the UK. In EMMA the injection and extraction energies must be arbitrarily changed for a beam with emittance of 3 mm to study the beam dynamics in detail for the entire range of operating energy. In addition, in the planned machine the betatron tunes vary more than a factor of two during acceleration. The requirement of variable injection or extraction energy requires careful optimisation of the of injection elements and operational conditions. The details and design status of the scheme will be described in this paper.

THPMN111	A Kicker Driver for the International Linear Collider	damping, linear-collider, collider, positron	2972
	M. A. Kempkes F. O. Arntz, M. P.J. Gaudreau Diversified Technologies, Inc., Bedford, Massachusetts A. Kardo-Sysoev IOFFE, St. Petersburg A. Krasnykh SLAC, Menlo Park, California
	Diversified Technologies, Inc. (DTI), under a SBIR grant from the U. S. Department of Energy, is developing a driver for a kicker strip-line deflector which inserts and extracts charge bunches to and from the electron and positron damping rings of the International Linear Collider. The deflector requires a driver capable of 10 kV, 200 A pulses of 2 ns duration, after-pulse clamping of the deflector voltage to less than one volt within six nanoseconds, and must function at burst rates of 3 to 6 MHz. The driver must also effectively absorb high-order mode signals emerging from the deflector itself. In this paper, DTI will describe a promising approach to the design of the kicker driver involving high voltage DSRDs (Drift Step Recovery Diodes) and high voltage MOSFETs. In addition, our design approach to meeting the challenges posed by the ILC requirements will be discussed.

THPMN115	Injection and Extraction Lines for the ILC Damping Rings	quadrupole, damping, extraction, injection	2984
	I. Reichel
	Funding: This work was supported by the U. S. Department of Energy under Contract No. DE-AC02-05CH11231. The current design for the injection and extraction lines into and out of the ILC Damping Rings is presented as well as the design for the abort line. Due to changes of the geometric boundary conditions by other subsystems of the ILC a modular approach has been used to be able to respond to recurring layout changes while reusing previously designed parts. Available beam dynamics studies for those lines are discussed.

THPAN028	HESR Lattice with Non-similar Arcs for the Stochastic Cooling	lattice, quadrupole, pick-up, dynamic-aperture	3289
	Y. Senichev
	The advanced HESR lattice with two arcs having the identical layout and the different slip factors are developed. The conception of arcs with three families of quadrupole allows easy adjusting the imaginary transition energy in one arc and the real transition energy in another arc with the absolute value close to the beam energy in whole required region from 3.0 GeV to 14 GeV. The arcs have the special feature, when the high order non-linearities are fully compensated inside of each arc, and therefore the dynamic aperture of the whole machine is conserved. We consider and compare two lattices with the same absolute value of transition energy: the current lattice with the negative momentum compaction factor in both arcs and the lattice having the negative and positive momentum compaction factors in different arcs correspondingly. Simultaneously we analyzed the 4 and 6 fold symmetry arcs machine. It allows making the conclusion that the 4 fold symmetry lattice is more suitable to get the required slip factors. At the lowest energy 3 GeV, the absolute value of slip factor in the imaginary and the real arc is related as ~0.09/0.02 correspondingly. For the higher beam energy this ratio is much bigger.

THPAN048	Numerical Solver with CIP Method for Fokker Planck Equation of Stochastic Cooling	simulation, pick-up, feedback, impedance	3336
	T. Kikuchi T. Katayama CNS, Saitama S. Kawata Utsunomiya University, Utsunomiya
	A Fokker Planck equation for a Stochastic cooling* is solved by using the CIP method*. The Fokker Planck equation can be described in a convection-diffusion equation as a function of time and energy. The equation is a non linear form and the evolution of the distribution function should be numerically solved. The CIP method, which is an effective scheme to solve the convection term numerically, is applied to the Fokker Planck equation of the Stochastic cooling. By using the CIP method for the numerical solver, we can effectively calculate the time-dependent Fokker Planck equation in more few computational costs. The developed numerical solver can give us the energy spectrum of the particle distribution during the beam cooling. The simulation results show the good agreements compared with the experimental results. S. Van der Meer, CERN/PS/AA/78-22, 1978.** T. Yabe and T. Aoki, Comp. Phys. Commun. 66 (1991) 219.

THPAN059	Proposal for an Enhanced Optical Cooling System Test in an Electron Storage Ring	electron, undulator, pick-up, storage-ring	3363
	E. G. Bessonov M. V. Gorbunkov LPI, Moscow A. A. Mikhailichenko Cornell University, Department of Physics, Ithaca, New York
	We are proposing to check experimentally the new idea of Enhanced Optical Cooling (EOC) in an electron storage ring. The experiment will confirm new fundamental processes in beam physics and demonstrate new unique possibilities in cooling technique. It will open important applications of EOC in nuclear physics, elementary particle physics and in light sources (LS) based on high brightness electron, proton, and ion beams.

THPAN102	Tevatron Optics Measurements using an AC Dipole	dipole, betatron, optics, synchrotron	3465
	R. Miyamoto A. Jansson, M. J. Syphers Fermilab, Batavia, Illinois S. E. Kopp The University of Texas at Austin, Austin, Texas
	The AC dipole is a device that can be used to study beam optics of hadron synchrotrons. It can produce sustained large amplitude oscillations with virtually no emittance growth. A vertical AC dipole for the Tevatron was recently implemented and a maximum oscillation amplitude of 2 (4) σ beam size at 980 (150) GeV was achieved. If such large oscillations are combined with the Tevatron's BPM system (20 micron resolution), not only linear but even nonlinear optics can be measured not depending on machine models. This paper discusses how to make model independent measurements of ring-wide beta functions using the AC dipole and shows test results and comparisons to other methods. The emittance preserving nature of the AC dipole allows multiple measurements on the same beam. By repeating measurements with a small change to the optics every time, the accuracy of measurements using the AC dipole can be determined. Results of such tests are also presented.

THPAS039	Status Report on the NSCL RF Fragment Separator	collimation, cyclotron, ion, secondary-beams	3585
	M. Doleans V. Andreev, B. Arend, D. Bazin, A. Becerril Reyes, R. Fontus, P. Glennon, D. Gorelov, P. F. Mantica, J. Ottarson, H. Schatz, B. Sherrill, J. Stoker, O. Tarasov, J. Vincent, J. Wagner, X. Wu, A. Zeller NSCL, East Lansing, Michigan
	The RF Fragment Separator (RFFS) proposed in* is now under construction and should be operational by May 2007. The RFFS is an additional purification system for secondary beams at the National Superconducting Cyclotron Laboratory after the existing A1900 fragment separator and will primarily be used to purify beams of rare neutron deficient isotopes. The RFFS uses a transverse electric field of an rf kicker to separate unwanted particles from the desired ion beam, a pi/2 phase advance cell to rotate the beam in phase space before the beam reaches a collimating aperture for purification and a final pi phase advance cell to transport the desired beam to the experiment. The final design for the rf kicker and the focusing system is presented and a status report on the building and commissioning effort is given. * D. Gorelov, V. Andreev, D. Bazin, M. Doleans, T. Grimm, F. Marti, J. Vincent and X. Wu, "RF-Kicker System for Secondary Beams at NSCL/MSU" PAC2005, Knoxville, Tennessee, 16th-20th, May 2005

FRPMN014	3D Simulation of Coherent Instabilities in Long Bunches Induced by the Kicker Impedances in the FAIR Synchrotrons	impedance, space-charge, damping, simulation	3919
	O. Boine-Frankenheim V. Kornilov GSI, Darmstadt
	Funding: Work supported by the European Community under the FP6 programme: Structuring the European Research Area - Specific Support Action - DESIGN STUDY (contract 515873 - DIRACsecondary-Beams). 3D simulation studies of the transverse impedance budget for long bunches in the FAIR synchrotrons have been started. Important transverse instability driving sources are the thin resistive wall and the kicker impedances. Major concerns are the required low momentum spreads and the additional loss of Landau damping due to the space charge tune shift. The simulation code PATRIC has been extended in order to predict coherent instability thresholds with space charge and for broadband impedance sources. Examples of code benchmarking using the numerical Schottky noise, analytical stability boundaries and comparisons with other codes will be discussed. The improvement of transverse stability in long bunches relative to a coasting beam is analyzed for different rf wave forms. Conclusions for the impedance budget in the FAIR synchrotrons are drawn.

FRPMN021	Investigation of the Injection into the ANKA Storage Ring by a Turn by Turn BPM System	injection, booster, septum, storage-ring	3958
	E. Huttel I. Birkel, A.-S. Muller, P. Wesolowski FZK, Karlsruhe
	Modern BPM Electronics allow turn by turn acquisition of the position for both the injected and stored beam. This offers additional opportunities for diagnostics. In addition to the slow acquisition system installed at ANKA, two LIBERA ELECTRON units (www.i-tech.si) have been installed. I. E. the system was used to investigate and optimize the Injection. The stray field of the Septum causes a bump of the stored beam. The settings of the Kicker could be optimized for minimized the orbit distortion. By measuring the phase space of the injected beam the injection efficiency will be improved.

FRPMN022	Analysis of Multi-Turn Beam Position Measurements in the ANKA Storage Ring	damping, sextupole, storage-ring, electron	3964
	A.-S. Muller I. Birkel, E. Huttel, P. Wesolowski FZK, Karlsruhe
	The observation of betatron oscillations following a deflection by a kicker pulse offers the possibility to study various machine parameters. The damping of the centre-of-charge signal's amplitude for one bunch, for example, depends chromaticity, energy loss, momentum compaction factor and impedance. A new multi-turn acquisition system based on LIBERA ELECTRON units (http://www.i-tech.si) has been installed in the ANKA storage ring. First analyses of the thus acquired data for different machine conditions reveal systematic limitations in the current ANKA multi-turn setup. Measurements preformed under varying conditions are presented and discussed with respect to the influence on future analysis. * http://www.i-tech.si

FRPMN084	Beam Trip Event Diagnostic System for the TLS	diagnostics, controls, insertion, insertion-device	4264
	K. H. Hu J. Chen, K. T. Hsu, C. H. Kuo, C. Y. Wu NSRRC, Hsinchu
	The beam trip event diagnostic system includes several eight channels high-speed digitizer for data acquisition, PC base computer and optical fibre network applies to capture data. The PC are also to serve signal processing, beam trip event analysis and archive. This system can integrate beam trip, interlock signal of SRF, waveform of the injection kicker, quench and interlock signal of the superconducting insertion device, and instability of the stored beam. This diagnostic system can be routine monitor signal and record beam trip event. Design consideration and details of the implementation will be summarized in this report.

FRPMN109	200-mA Studies in the APS Storage Ring	impedance, storage-ring, vacuum, injection	4354
	K. C. Harkay Y.-C. Chae, L. Emery, L. H. Morrison, A. Nassiri, G. J. Waldschmidt ANL, Argonne, Illinois
	Funding: Work supported by U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Advanced Photon Source storage ring is normally operated with 100 mA of beam current. A number of high-current studies were carried out to determine the multibunch instability limits. The longitudinal multibunch instability is dominated by the rf cavity higher-order modes (HOMs), and the coupled-bunch instability (CBI) threshold is bunch-pattern dependent. We can stably store 200 mA with 324 bunches, and the CBI threshold is 245 mA. With 24 bunches, several components are approaching temperature limits above 160 mA, including the HOM dampers. We do not see any CBI at this current. The transverse multibunch instabilities are most likely driven by the resistive wall impedance; there is little evidence that the dipole HOMs contribute. Presently, we rely on the chromaticity to stabilize the transverse multibunch instabilities. When we stored beam up to 245 mA, we used high chromaticity, and the beam was transversely stable. The stabilizing chromaticity was studied as a function of current. We can use these experimental results to predict multibunch instability thresholds for various upgrade options, such as smaller-gap or longer ID chambers and the associated increased impedance.

FRPMS016	A BPM Calibration Procedure using TBT Data	lattice, closed-orbit, emittance, injection	3928
	M.-J. Yang J. L. Crisp, P. S. Prieto Fermilab, Batavia, Illinois
	Accurate BPM calibration is important in most lattice analysis. This paper describes a procedure developed as a logical extension of TBT data lattice analysis to extract relative calibration between BPMs in the machine. The method has been applied previously to the Recycler Ring and recently to Main Injector at Fermilab with amazing success. The results will be presented. The BPM position resolution is crucial to the procedure and will also be addressed.

FRPMS039	Growth Time of Longitudinal Coupled Bunch Mode Instability in the Duke FEL Facility	storage-ring, feedback, damping, electron	4036
	Y. Kim J. Li, Y. K. Wu FEL/Duke University, Durham, North Carolina
	To determine the required power of an RF amplifier for the longitudinal feedback system (LFS), the growth time of the longitudinal coupled bunch mode instability (CBMI) in the Duke storage ring should be known in advance. In 2005, we measured the longitudinal beam instability with four and eight symmetrically filled buckets in the Duke storage ring. By analyzing measured data, the growth time of the longitudinal CBMI can be estimated. At a beam energy of 274 MeV, the projected growth time is about 0.37 ms for a total stored current of 160 mA. To damp harmful longitudinal CBMI with a relative energy deviation of 0.1% (rms) within the growth time, a sufficient RF power of 135 W (rms) should be delivered to an LFS kicker at a central frequency of 758.8375 MHz. In this paper, we describe measurements of the growth time and the estimation of the RF power requirement for the LFS.

FRPMS052	H⁺ and H^- Beam Position and Current Jitter at LANSCE	isotope-production, linac, quadrupole, feedback	4105
	J. D. Gilpatrick B. Blind, M. S. Gulley, C. Pillai, J. F. Power LANL, Los Alamos, New Mexico
	*Funding: Work supported by the U. S. Department of Energy.** During the CY2005 and CY2006 Los Alamos Neutron Science Center (LANSCE) beam runs, six beam-development shifts were performed in order to acquire and analyze beam-current and beam-position jitter data for both the LANSCE H⁺ and H^- beams. These data were acquired using three beam position monitors (BPMs) from the 100-MeV Isotope Production Facility (IPF) beam line and three BPMs from the Switchyard transport line at the end of the LANSCE 800-MeV linac. The two types of data acquired, intermacropulse and intramacropulse, were analyzed for statistical and frequency characteristics as well as various other correlations including comparing their phase-space characteristics in a coordinate system of transverse angle versus transverse position. This paper will briefly describe the measurements required to acquire these data, the analysis of these jitter data, and some interesting implications to beam operation.