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MOZDM01 LHC Hardware Commissioning Summary dipole, controls, cryogenics, instrumentation 56
 
  • R. I. Saban
    CERN, Geneva
  The presentation summarizes the main phases of the LHC hardware commissioning and discusses especially the powering of one completer sector to the nominal current.  
slides icon Slides  
 
MOPC089 About Carbides-made Nanoceramics Fission Target for RIB Production target, electron, ion, ion-source 268
 
  • V. Gubin, M. Golkovsky
    BINP SB RAS, Novosibirsk
  • O. Alyakrinsky
    INFN/LNL, Legnaro, Padova
  • S. P. Bardakhanov
    SB RAS Khristianovich Institute of Theoretical and Applied Mechanics, Novosibirsk
  Intensities of RIBs can be increased with improvement of release efficiency of fission targets. One of factor, which limits release efficiency of targets, is efficiency of release of isotopes from target material. This paper presents investigation of dependence of release efficiency from ceramics target on its grain size and inter-grains pores, as well shows some efficiency limits and ways to improve it. Simulations were performed for uniform target material made from powder of uranium carbide. Inter-grain spaces are taken relative to grain sizes, as another parameter to optimize is high density of target material. Results show that optimal grain size is in the range of hundreds - thousands nanometers, while recent target materials utilize one order more sizes of grains. In addition, key points of production of such ceramics are discussed. The beam technologies allow producing the nanopowders from carbides of different metals with controlled grain size. Exact methods also give to us possibilities to obtain ceramics with optimal ratio between grain and pores sizes. Possible problems and preliminary program of experiments and tests are discussed.  
 
MOPC100 Design Status of the FAIR Synchrotrons SIS100 and SIS300 and the High Energy Beam Transport System synchrotron, acceleration, beam-losses, dipole 298
 
  • P. J. Spiller, U. B. Blell, O. Boine-Frankenheim, E. S. Fischer, G. Franchetti, F. Hagenbuck, I. Hofmann, J. E. Kaugerts, M. Kauschke, M. Kirk, H. Klingbeil, A. Kraemer, D. Krämer, G. Moritz, C. Omet, N. Pyka, H. Ramakers, S. Ratschow, A. Saa-Hernandez, M. Schwickert, J. Stadlmann, H. Welker
    GSI, Darmstadt
  • A. D. Kovalenko
    JINR, Dubna, Moscow Region
  The present status of system- and technical design and R&D for the new heavy ion synchrotrons SIS100 and SIS300 and the HEBT system is summarized. The overall machine planning and the general layout has been completed and the detailed technical machine design has been started. Device and component specifications, technical parameter lists and technical design reports are in preparation with the goal to enable international partners or industry to finalize the component design to achieve production readiness. In the frame of international working groups the distribution and sharing of the work packages, especially of the cryomagnetic system is under discussion.  
 
MOPC103 Short Circuit Tests: First Step of LHC Hardware Commissioning Completion controls, dipole, quadrupole, monitoring 304
 
  • B. Bellesia, E. Barbero-Soto, F. Bordry, M. P. Casas Lino, G.-J. Coelingh, G. Cumer, K. Dahlerup-Petersen, J.-C. Guillaume, J. Inigo-Golfin, V. Montabonnet, D. Nisbet, M. Pojer, R. Principe, F. Rodriguez-Mateos, R. I. Saban, R. Schmidt, H. Thiesen, A. Vergara-Fernández, M. Zerlauth
    CERN, Geneva
  • A. Castaneda, I. Romera Ramirez
    CIEMAT, Madrid
  The Large Hadron Collider operation relies on 1232 superconducting dipoles with a field of 8.33T and 400 superconducting quadrupoles with a strength of 220 T/m powered at 12kA, operating in superfluid He at 1.9K. For dipoles and quadrupoles as well as for many other magnets more than 1700 power converters are necessary to feed the superconducting circuits. Between October 2005 and September 2007 the so-called short circuit tests were carried-out in the 15 underground areas where the power converters of the superconducting circuits are located. The tests were aimed at the qualification of the normal conducting components of the circuits: the power converters, the normal conducting DC cables between the power converters and the LHC cryostat, the interlocks and energy extraction systems. In addition, the correct functioning of the infrastructure systems (AC distribution, water and air cooling, control system) were validated. The final validation test for each underground area was the powering of all converters at ultimate current during 24h. This approach highlighted a few problems that were solved long before the beginning of magnet commissioning and beam operation.  
 
MOPC108 AGS Polarized Proton Operation in Run 8 resonance, polarization, injection, emittance 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.  
 
MOPC123 Lattice Study for the Carbon Ion Synchrotron forTherapy with Electron Cooling ion, electron, synchrotron, septum 355
 
  • S. V. Sinyatkin, V. A. Kiselev, E. B. Levichev, V. V. Parkhomchuk, V. B. Reva, V. A. Vostrikov
    BINP SB RAS, Novosibirsk
  In this paper the preliminary design of magnet lattice of the Carbon Ion Therapy Facility with electron cooling is described. The influence of misalignments of magnetic elements on ring parameters and the layout of orbit correction are estimated. The different methods of ion extractions from the synchrotron are considered, i.e., the pellet extraction, recombination extraction and the extraction on the sextupole resonance.  
 
MOPC124 Ion Optical Design of SIS100 and SIS300 ion, lattice, quadrupole, dipole 358
 
  • J. Stadlmann, G. Franchetti, B. J. Franczak, M. Kirk, N. Pyka, A. Saa-Hernandez, P. J. Spiller
    GSI, Darmstadt
  The ion optical layout of the two synchrotrons SIS100/300 of the FAIR project is presented. SIS100 will provide high intensity ion beams of all species from H to U up to a magnetic rigidity of 100 Tm. To minimize the space charge effects and to reach the necessary ion intensities for the FAIR project SIS100 will be operated with intermediate charge state heavy ions (U28+). The ion optical layout of SIS100 has been optimized for this purpose. The layout assures the separation of beam particles which are ionized by collisions with residual gas molecules from the circulating beam. Since SIS100 and SIS300 will be installed in the same tunnel, the lattice layout of SIS300 has to follow precisely the geometry of SIS100. SIS300 will provide beams of highly charged heavy ions with a maximum rigidity of 300 Tm. In addition, it will function as a stretcher ring for SIS100. The beam transfer system from SIS100 to SIS300 is designed to fit in a single straight section of the two machines. The effect of dynamic field errors in SIS300 has been considered and the maximum tolerable error levels for the operation of SIS100, such as tracking errors and power supply ripples have been investigated.  
 
MOPC128 J-PARC Accelerator Scheme for Muon to Electron Conversion Search proton, emittance, background, kicker 367
 
  • M. Tomizawa
    KEK, Ibaraki
  • M. Aoki, I. Itahashi
    Osaka University, Osaka
  The searching for coherent neutrino-less conversion of a muon to an electron (COMET) at sensitivity of 10?16 has been proposed as an experiment using the J-PARC Nuclear and Particle Experimental (NP) Hall. The experiment is planned to utilize a 56 kW, 8 GeV-bunched proton beam slowly extracted from the J-PARC main ring. The 1 MHz beam pulsing with an extremely low bunch to bunch gap background is needed to eliminate beam-related background events and keep an experimental sensitivity as high as possible. The 8 GeV extraction energy is rather lower than an ordinary energy. The beam size must be less than apertures of the extracted orbit in the ring and the transport line to the NP Hall. Accelerator scheme to satisfy above requirements will be reported in this paper.  
 
MOPC136 Beam Bunch Leakage and Control in the SNS Ring beam-losses, simulation, accumulation, linac 391
 
  • Y. Zhang, J. Galambos
    ORNL, Oak Ridge, Tennessee
  In recent neutron production operations at SNS, beams contaminated the longitudinal extraction gap of the accumulator ring due to the limitation of the beam choppers. It caused significant beam loss and activation in the ring and in the extraction beam line. From simulations with computer models and in experimental measurements, properly utilizing the ring RF systems with additional storage turns after the beam accumulations in the ring effectively reduced beam loss in the SNS accelerator systems. Simulations and beam measurement results will be discussed  
 
MOPC140 Status of the Multipurpose Fully Superconducting ECR Ion Source plasma, ion, injection, diagnostics 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.  
 
MOPC141 Design of a Novel Tubular Electron String Ion Source (TESIS) ion, electron, ion-source, gun 403
 
  • E. Syresin, D. E. Donets, E. D. Donets, E. E. Donets, V. B. Shutov
    JINR, Dubna, Moscow Region
  • V. M. Drobin, A. V. Shabunov, Yu. A. Shishov
    JINR/LHE, Moscow
  • A. E. Dubinov, R. M. Garipov, I. V. Makarov
    VNIIEF, Sarov (Nizhnii Gorod)
  • L. Liljeby
    MSL, Stockholm
  The project, started in 2007 is directed to creation of Tubular Electron String Ion Source (TESIS) and to basic studies of electron strings in tubular geometry. The collaboration consists of JINR (Dubna) and Russian Federal Nuclear Center (Sarov, Russia), Manne Siegbahn Laboratory (Stockholm, Sweden), TRIUMF and Atomic Energy of Canada Ltd. (Canada). Tubular concept of ion source has been proposed few years ago*. Preliminary theoretical estimations and numerical simulations have been done**,*** that allowed to start experimental realization of this project. New tubular source with a superconducting solenoid up to 5 Tesla should be constructed in 2009. It is expected that this new TESIS (“Krion-T1”) will meet all rigid conceptual and technological requirements and should provide ion output on a level, approaching to 10 mA of Ar16+ ions in the pulse mode and about 10 mA of Ar16+ ions in the average current mode. Having these output parameters, “Krion-T1” TESIS should be an operational prototype of further TESIS sources for all kinds of the possible applications. Simulation results and a basic scetch of the TESIS construction will be presented.

*Donets E. D. et al. Rev. Sci. Instrum. 73, 696 (2002).
**Donets E. D., Donets E. E., Becker R. et al. Rev. Sci. Instrum.75, 1566 (2004).
***Donets E. E. J. of Phys.: Conf. Series 2, 97 (2004).

 
 
MOPC142 Study of the Post Extraction Acceleration Gap in the ISIS H- Penning Ion Source acceleration, ion, emittance, ion-source 406
 
  • D. C. Faircloth, M. Whitehead, T. Wood
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • C. Gabor
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
  • J. K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon
  The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). The injection energy into the RFQ will be in the range of 50 to 70 keV whereas the standard ISIS H- Penning ion source operates at 35 keV, therefore the post extraction acceleration voltage must be increased. In order to finalise the design of the FETS post extraction system, a study is conducted on the Ion Source Development Rig (ISDR) at ISIS. This study shows how beam transport is affected by different post extraction acceleration voltages and gap lengths. Beam, current, profile and emittance measurements are presented along with theoretical calculations.  
 
MOPC143 Multi-beamlet Study of Beam Transport in the ISIS H- Ion Source Analysing Magnet ion-source, ion, acceleration, plasma 409
 
  • D. C. Faircloth, S. R. Lawrie, A. P. Letchford, M. E. Westall, M. Whitehead, T. Wood
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). The existing 90° analysing magnet on the ISIS H- Penning ion source does not perfectly transport the beam after extraction. The present ion source has a 10 mm x 0.6 mm slit extraction aperture. To understand how the beam is transported in the analysing magnet, new ion source aperture plates are manufactured with 5 individual holes instead of a slit. These holes produce separate beamlets that are used to study transport in the sector magnet. This paper details the experiments with the modified aperture plates on the Ion Source Development Rig (ISDR) at ISIS.  
 
MOPC144 Installation of the Front End Test Stand High Performance H- Ion Source at RAL ion, ion-source, acceleration, power-supply 412
 
  • D. C. Faircloth, M. H. Bates, S. R. Lawrie, A. P. Letchford, M. Perkins, M. E. Westall, M. Whitehead, P. Wise, T. Wood
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • C. Gabor
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
  • J. K. Pozimski, P. Savage
    Imperial College of Science and Technology, Department of Physics, London
  The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). This paper details the first stage of construction- the installation of the ion source.  
 
MOPC145 Commissioning of the ECR Ion Sources at CNAO Facility ion, ion-source, emittance, plasma 415
 
  • G. Ciavola, L. Celona, S. Gammino, F. Maimone
    INFN/LNS, Catania
  • C. Bieth, W. Bougy, G. Gaubert, O. Tasset, A. C.C. Villari
    PANTECHNIK, BAYEUX
  • A. Galatà
    INFN/LNL, Legnaro, Padova
  • R. Monferrato, 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. At CNAO two ECR sources of the Supernanogan type (built by the Pantechnik company according to specifications set by INFN) are installed and run continuously and in parallel, to allow the fast change of the particle species. The two sources are identical and can provide both particle species after a simple switch from one gas to the other, which allows as well to run the facility, in emergency, with only one source. Each source is equipped with a dedicated beam line including a spectrometer and beam diagnostics. Optimisation of beam emittance and intensity is of primary importance to obtain the necessary current at the RFQ-LINAC and then at injection. The preliminary tests have shown the complete fulfillment of the specifications in terms of beam current and emittance and the final tests are ongoing. A description of the source design and performance will be presented.  
 
MOPC146 Development of Piezoelectric Pulse Gas Valve for Small ECR Ion Source ion, plasma, ion-source, vacuum 418
 
  • M. Ichikawa, H. Fujisawa, Y. Iwashita, Y. Tajima, H. Tongu, M. Yamada
    Kyoto ICR, Uji, Kyoto
  In a conventional ion source, the source gas is continuously fed even in its pulse operation. This requires a high load to a vacuum pumping system. The situation is prominent when the gas load is relatively higher in such a high current ion source. In order to improve this situation, we try to supply gas only when it is needed by synchronizing the gas feed with the extraction of the ion beam. We have developed a small pulse-gas-valve using a commercially available disc-shape piezoelectric element. This valve is small enough to be mounted in our ECR ion source and is capable of very fast open-and-close operation of an order of kHz repetition. A small ECR ion source with this valve will be presented.  
 
MOPC150 Modifications to the Analysing Magnet in the ISIS Penning Ion Source ion-source, ion, beam-transport, emittance 427
 
  • S. R. Lawrie, D. C. Faircloth, A. P. Letchford, M. E. Westall, M. Whitehead, T. Wood
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • J. K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon
  A full 3D electromagnetic finite element analysis and particle tracking study is undertaken of the ISIS Penning surface plasma ion source using CST Particle Studio 2008. The existing 90° analysing magnet is found to have a magnetic field index of 1.3, causing beam divergence and contributing to beam loss. Different magnet pole piece geometries are modelled and the effect of space charge investigated. Based on this modelling, three new sets of poles are manufactured and tested on the Ion Source Development Rig. The results are presented herein.  
 
MOPC151 Status of the Versatile Ion Source VIS plasma, ion, proton, controls 430
 
  • F. Maimone, L. Celona, F. Chines, G. Ciavola, G. Gallo, N. Gambino, S. Gammino, D. Mascali, R. Miracoli, S. Passarello, E. Zappalà
    INFN/LNS, Catania
  The characteristics of the ideal injector for high power proton accelerators has been studied in the past with the TRIPS ion source built at INFN-LNS, Catania and now in operation at INFN-LNL, Legnaro. The beam production must obey to the request of high brightness, stability and reliability. The new Versatile Ion Source (VIS) is a permanent magnet version of the TRIPS source with a simplified and robust extraction system. It operates up to 80 kV without a bulky high voltage platform, producing multi-mA beams of protons and H2+. The description of the source design and the preliminary performance will be presented. An outline of the forthcoming developments is given, with particular care to the use of a low loss dc break and to the use of a travelling wave tube amplifier to get an optimum matching between the microwave generator and the plasma.  
 
MOPC156 ECR Ion Source for the KEK All-ion Accelerator ion, vacuum, simulation, plasma 442
 
  • H. Suzuki, Y. Arakida, T. Iwashita, M. Kawai, T. Kono, K. Takayama
    KEK, Ibaraki
  • S. I. Inagaki
    Kyushu University
  • K. Okazaki
    Nippon Advanced Technology Co. Ltd., Ibaraki-prefecture
  R&D works to realize an all-ion accelerator (AIA)* -capable of accelerating all ions of any possible charge state, based on the induction synchrotron concept, which was demonstrated using the KEK 12 GeV-PS**, are going on. As an ion source for the KEK-AIA, an electron cyclotron resonance (ECR) ion source has been developed. Permanent magnets made of NdFeB to generate a cusp field and 9.4 GHz microwave to energize plasma electrons have been employed. The microwave power of 750 W generated in a traveling wave tube is focused into the interaction region with a horn antenna. Regarding the cut off density for 9.4 GHz, the vacuum and the gas feeding system has been designed. The base pressure of 1·10-5 Pa is reached with a single turbo molecular pump of 300 l/min, and the gas flow rate less than 1 cc/min is maintained with a mass flow controller. The plasma chamber is water-cooled against Joule heating. The geometry of the extraction electrodes and the downstream transport line have been optimized by IGUN simulations. The whole system will be embedded in the high voltage terminal box of 200 kV. Details of the design and the preliminary test will be described at this conference.

*K. Takayama, Y. Arakida, T. Iwashita, Y. Shimosaki, T. Dixit, and K. Torikai, J. of Appl. Phys. 101, 063304 (2007).
**K. Takayama et al., Phys. Rev. Lett. 98, 054801 (2007).

 
 
MOPD034 Status of the High Power, Solid-State RF Amplifier Development at Laboratori Nazionali di Legnaro controls, power-supply, synchrotron, coupling 526
 
  • F. Scarpa, A. Facco, D. Zenere
    INFN/LNL, Legnaro, Padova
  The development of high power, unconditionally stable solid-state amplifiers for superconducting low-beta cavities, performed at Laboratori Nazionali di Legnaro in the framework of the EURISOL Design Study, has led to the construction and testing of two, newly designed 10 kW units that can be used both individually or coupled together to obtain a 20 kW source. Characteristic of this family of amplifiers, based on parallel assemblies of 300W modules equipped with mosfets and individual circulators, is their possibility of operating in any matching conditions and also, at a reduced power, in case of failure of one mosfet. Characteristics of the amplifiers and of the high power combiner will be described, and their performance and test results will be reported.  
 
MOPD037 Safety Testing for LHC Access System controls, site, simulation, monitoring 532
 
  • F. Valentini, T. Ladzinski, P. Ninin, L. Scibile
    CERN, Geneva
  This paper presents the validation and verification activities carried out for the LHC Access Control and Safety System. It also presents a new strategy for the future that includes the application of formal methods based on model checking techniques, commonly used to prove the correctness of software algorithms or system functional specifications through automatic exploration of the system state space. We will show how to apply these techniques in order to automate the testing process. The paper also presents the results of the performances and the applicability of a series of tools that have been tested in order to carry out a formal correctness proof for the LHC Access System.  
 
MOPP003 Study of Abnormal Vertical Emittance Growth in ATF Extraction Line emittance, simulation, multipole, quadrupole 553
 
  • M. Alabau, A. Faus-Golfe
    IFIC (CSIC-UV), Valencia
  • M. Alabau, P. Bambade, J. Brossard, G. Le Meur, C. Rimbault, F. Touze
    LAL, Orsay
  • D. Angal-Kalinin, J. K. Jones
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • R. Appleby, A. Scarfe
    UMAN, Manchester
  • S. Kuroda
    KEK, Ibaraki
  • G. R. White, M. Woodley
    SLAC, Menlo Park, California
  • F. Zimmermann
    CERN, Geneva
  Since several years, the vertical emittance measured in the Extraction Line (EXT) of the Accelerator Test Facility (ATF) at KEK, that will transport the electron beam from the ATF Damping Ring (DR) to the future ATF2 Final Focus beam line, is significantly larger than the emittance measured in the DR itself, and there are indications that it grows rapidly with increasing beam intensity. This long-standing problem has motivated studies of possible sources of this anomalous emittance growth. One possible contribution is non-linear magnetic fields in the extraction region experienced by the beam while passing off-axis through magnets of the DR during the extraction process. In this paper, simulations of the emittance growth are presented and compared to observations. These simulations include the effects of predicted non-linear field errors in the shared DR magnets and orbit displacements from the reference orbit in the extraction region. Results of recent measurements using closed orbit bumps to probe the relation between the extraction trajectory and the anomalous emittance growth are also presented.  
 
MOPP005 The 2 mrad Crossing Angle Scheme for the International Linear Collider quadrupole, optics, multipole, linear-collider 556
 
  • R. Appleby
    UMAN, Manchester
  • D. Angal-Kalinin
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • P. Bambade, S. Cavalier, G. Le Meur, F. Touze
    LAL, Orsay
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto
  The present baseline configuration of the ILC has a 14 mrad crossing angle between the beams at the interaction point. This allows easier extraction of the beams after collisions, but imposes on the other hand more constraints on the control of the beams prior to colliding them. Moreover, some limitations to physics capabilities arise, in particular because of the degraded very forward electromagnetic detector hermeticity and because calibration procedures for (gaseous) tracking detectors become more complex. To mitigate these problems, alternative configurations with very small crossing angles are studied. A new version of the 2 mrad layout was designed last year, based on simpler concepts and assumptions. The emphasis of this new scheme was to satisfy specifications with as few and feasible magnets as possible, in order to reduce costs. Recent progress designing several of the magnets involved and the particular vacuum chamber needed in the shared part of the beam line is reported.  
 
MOPP010 Experimental Studies on Drive Beam Generation in CTF3 linac, injection, 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.  
 
MOPP016 Collimation Aperture for the Beam Delivery System of the International Linear Collider collimation, quadrupole, linear-collider, emittance 586
 
  • F. Jackson
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  The beam delivery sytem (BDS) of the international linear collider (ILC) must provide efficient removal of beam halo particles which would cause unacceptable detector background. The collimation aperture or 'collimation depth' is designed such that synchrotron radiation from the halo emitted in the final doublet passes cleanly through the detector interaction region. The ILC BDS collimation depth for several different detector scenarios is evaluated using a semi-analytical technique.  
 
MOPP025 Design of the Beam Extraction by Using Strip-line Kicker at KEK-ATF kicker, septum, injection, 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.

 
 
MOPP047 Simulation Studies on the Vertical Emittance Growth at the Existing ATF Extraction Beamline emittance, multipole, damping, coupling 652
 
  • F. Zhou, J. W. Amann, S. Seletskiy, A. Seryi, C. M. Spencer, M. Woodley
    SLAC, Menlo Park, California
  Significant dependence of the vertical emittance growth on the beam intensity was experimentally observed at the Accelerator Test Facility (ATF) at KEK extraction beamline. This technical note describes the simulations of possible vertical emittance growth sources, particularly in the extraction channel, where the magnets are shared by both the ATF extraction beamline and its damping ring. The vertical emittance growth is observed in the simulations by changing the beam orbit in the extraction channel, even with all optics corrections. The possible reasons for the experimentally observed dependence of the vertical emittance growth on the beam intensity are discussed. An experiment to measure the emittance versus beam orbit at the existing ATF extraction beamline is underway*.

*M. Alabau et al. Study of Abnormal Vertical Emittance Growth in ATF Extraction Line, this proceeding.

 
 
MOPP051 Effect of Fill Patterns on Extraction Jitter in Damping Rings damping, simulation, injection, 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.  
 
MOPP087 RF System for the SSRF Booster Synchrotron booster, synchrotron, injection, 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, vacuum, injection 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.  
 
TUOCG01 The Heidelberg Ion Therapy (HIT) Accelerator Coming into Operation synchrotron, ion, proton, linac 979
 
  • D. Ondreka, U. Weinrich
    GSI, Darmstadt
  The Heidelberg Ion Therapy Facility (HIT) is the first dedicated proton and carbon therapy facility in Europe. It uses full three dimensional intensity-controlled raster scanning as basic treatment technique. The commissioning of the accelerator with beam was successfully finished for two fixed-beam treatment places in December 2007. Therefore a library of 40000 combinations of beam properties (ion type, treatment place, energy, intensity, beam size) is now offered to the treatment technique teams preparing the treatment systems for the clinical use. The HIT facility also comprises a gantry with full scanning properties constituting the only carbon ion gantry worldwide. The gantry can be rotated by 360 degree, so that the beam may be aimed at the patient from arbitrary directions. Commissioning with beam of the gantry was started in January 2008 when the first beams were transported successfully into the treatment room. The talk will report on experiences and results of the commissioning of the accelerator sections. It puts special emphasis on the subject of preparing the enormous variety of beam properties in an efficient and reliable way.  
slides icon Slides  
 
TUOCG02 Status Report on the Centro Nazionale di Adroterapia Oncologica (CNAO) synchrotron, ion, injection, emittance 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 icon Slides  
 
TUPC033 IP BPM Position Error at CLIC due to Secondary Emission from Beam-beam Backgrounds simulation, background, feedback, luminosity 1122
 
  • A. F. Hartin, R. Apsimon, P. Burrows, C. I. Clarke, C. Perry, C. Swinson
    OXFORDphysics, Oxford, Oxon
  • G. B. Christian
    ATOMKI, Debrecen
  • B. Constance, H. Dabiri Khah
    JAI, Oxford
  • A. Kalinin
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  Beam-beam background impacts on the IP BPM are studied for the CLIC machine. The large number of coherent pairs ( 1.8×108 charges per BPM strip per bunch crossing) for the CLIC-G default parameter set, potentially leads to a large secondary emission in the BPM strips. Detailed GuineaPig++ and Geant studies reveal, however, that the coherent pairs travel down the extraction line without significant secondary showering. Geant studies of the CLIC incoherent pairs show a flux of secondary emission two orders of magnitude less than that expected for the ILC 1 TeV high luminosity scheme. Since previous studies showed that FONT IP BPM signal distortion for the ILC was of no concern, then it can also be neglected at CLIC.  
 
TUPC056 A Novel Beam Profile Monitor Based on a Supersonic Gas Jet target, ion, storage-ring, antiproton 1182
 
  • K.-U. Kuehnel, M. Putignano, C. D. Schroeter, J. Ullrich, C. P. Welsch
    MPI-K, Heidelberg
  At very low residual gas pressure below 10-12 mbar, as foreseen in future low-energy storage rings currently under development at the MPI-K and FAIR, conventional residual gas beam profile monitors cease to work with reasonable count rates. One possible way to overcome this restriction is the use of a supersonic gas jet as a profile monitor. Such a jet could be shaped as a thin curtain, thus providing a uniform target with a variable target density extended over the whole beam. A possible setup of such a device taking into account vacuum considerations, expected count rates and an envisioned detection scheme are presented in this contribution.  
 
TUPC060 A Counting Module for an Advanced Ionization Profile Monitor photon, controls, background, synchrotron 1194
 
  • D. A. Liakin, S. V. Barabin, A. Y. Orlov
    ITEP, Moscow
  • P. Forck, T. Giacomini
    GSI, Darmstadt
  A new multi-channel counting module has been developed for advanced Ionization Profile Monitor applications. The module's maximal performance concerning time resolution is about 10 beam profile measurements per microsecond at the cost of a slightly reduced spatial resolution with 80% accuracy (or better). Module architecture, basic modes of operation and the user interface are discussed. The results of the first test in laboratory and first beam profile measurements are also presented.  
 
TUPC071 Computer-assisted Electron Beam Centroid Characterization at AIRIX Facility diagnostics, electron, beam-transport, target 1212
 
  • O. Mouton, M. Caron, D. Collignon, H. Dzitko, B. Gouin, G. Grandpierre, D. Guilhem, L. Hourdin, C. Noel, O. Pierret
    CEA, Bruyères-le-Châtel
  AIRIX is a high current accelerator designed for flash X-ray radiography. The electron beam produced into a vacuum diode (2 kA, 3.5 to 3.8 MV, 60 ns) is extracted from a velvet cold cathode. For a beam characterisation we have seen* how to calculate the mean beam divergence (X'(0),Y'(0)), the RMS beam size (XRMS(0), YRMS(0)) as well as the 2D transverse beam emittance (ex(0),ey(0)). To have a complete initial characterization of the beam, we have to further calculate the centroid initial position (xc, yc) and its initial divergence (xc', yc'). In this aim, we use experimental results at BPM's located downstream the initial position of the cathode, and we also use the TRAJENV code coupled with the MINUIT minimization library. In this paper, we propose to describe both experimental and theoretical approaches leading to the full beam characterization (beam size, centroid position and divergence) at the diode output.

*O. Mouton & al. "Computer assisted Electron Beam Characterization at AIRIX Facility," PAC'07, Albuquerque (USA).

 
 
TUPC087 4D Emittance Measurements Using Multiple Wire and Waist Scan Methods in the ATF Extraction Line emittance, coupling, quadrupole, simulation 1257
 
  • C. Rimbault, P. Bambade, J. Brossard
    LAL, Orsay
  • M. Alabau
    IFIC, Valencia
  • S. Kuroda
    KEK, Ibaraki
  • A. Scarfe
    UMAN, Manchester
  • M. Woodley
    SLAC, Menlo Park, California
  Emittance measurements performed in the diagnostic section of the ATF extraction line since 1998 lead to vertical emittances three times larger than the expected ones, with a strong dependence on intensity. An experimental program is pursued to investigate potential sources of emittance growth and find possible remedies. This requires efficient and reliable emittance measurement techniques. In the past, several phase-space reconstruction methods developed at SLAC and KEK have been used to estimate the vertical emittance, based on multiple location beam-size measurements and dedicated quadrupole scans. These methods have been shown to be very sensitive to measurement errors and other fluctuations in beam conditions. In this context new emittance measurements have been performed revisiting these methods and newly developed ones with a systematic approach to compare and characterise their performance in the ATF EXT line.  
 
TUPC095 Beam Diagnostics for Commissioning the HEBT and Gantry Sections of the HIT Medical Accelerator diagnostics, ion, medical-accelerators, controls 1281
 
  • M. Schwickert, A. Reiter
    GSI, Darmstadt
  The HIT medical accelerator at Heidelberg, Germany, is the first dedicated heavy-ion cancer therapy facility in Europe, consisting of a two-stage injector Linac followed by a compact synchrotron. It features three treatment places: two horizontal beam lines, where treatment will be carried out from 2008 using proton and carbon beams, and the first 360° rotating heavy-ion Gantry structure. The accelerator sections of this facility were designed and constructed by GSI, which thereafter was in charge of the commissioning. By now, the required medical beam quality has been achieved in both horizontal beam lines, and beam commissioning of the Gantry structure has started. In this contribution we describe the technical layout of beam diagnostic devices and present measurement data taken in high-energy beam transport lines and patient treatment places.  
 
TUPC134 Results from Commissioning of the Energy Extraction Facilities of the LHC Machine dipole, superconducting-magnet, quadrupole, simulation 1383
 
  • K. H. Mess, G.-J. Coelingh, K. Dahlerup-Petersen
    CERN, Geneva
  The risk of damage to the superconducting magnets, busbars and current leads of the LHC machine in case of a resistive transition (quench) is being minimized by adequate protection. The protection is based on early quench detection, bypassing the quenching magnets by cold diodes, energy density dilution in the quenching magnets using heaters and, eventually, energy extraction. For two hundred and twenty-six LHC circuits (600 A and 13 kA) extraction of the stored magnetic energy to external dump resistors was required. All these systems are now installed in the machine and the final hardware commissioning has been undertaken. After a short description of the topology and definitive features, layouts and parameters of these systems the paper will focus on the results from their successful commissioning and an analysis of the system performance.  
 
TUPC154 CERN PSB Beam Tests of CNAO Synchrotron's Digital LLRF synchrotron, controls, proton, acceleration 1431
 
  • M.-E. Angoletta, A. Findlay
    CERN, Geneva
  • O. Bourrion, R. Foglio, D. Tourres, C. Vescovi
    LPSC, Grenoble
  • C. De Martinis
    INFN-Milano, Milano
  • L. Falbo, S. Hunt
    CNAO Foundation, Milan
  The Italian National Centre for Oncological hAdrontherapy (CNAO), in its final construction phase, uses proton and carbon ion beams to treat patients affected by solid tumours. At the heart of CNAO is a 78-meter circumference synchrotron that accelerates particles to up to 400 MeV/u. The synchrotron relies on a digital LLRF system based upon Digital Signal Processors (DSPs) and Field Programmable Gate Array (FPGA). This system implements cavity servoing and beam control capabilities, such as phase and radial loops. Beam tests of the CNAO synchrotron LLRF system were carried out at CERN’s Proton Synchrotron Booster (PSB) in autumn 2007, to verify the combined DSP/FPGA architecture and the beam control capabilities. For this, a prototype version of CNAO’s LLRF system was adapted to the PSB requirements. This paper outlines the prototype system layout and describes the tests carried out and their results. In particular, system architecture and beam control capabilities were successfully proven by comparison with the PSB operational beam control system and with the help of several existing beam diagnostic systems.  
 
TUPD002 Development of an Eddy Current Septum for LINAC4 septum, simulation, linac, injection 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.  
 
TUPD003 Upgrading the Fast Extraction Kicker System in SPS LSS6 kicker, impedance, proton, pick-up 1437
 
  • M. J. Barnes, L. Ducimetière, B. Goddard, J. A. Uythoven
    CERN, Geneva
  A fast extraction system, located in the LSS6 region of the CERN SPS accelerator, transfers 450 GeV/c protons, as well as ions, via the transfer line TI 2 towards the LHC. The system includes three travelling wave kicker magnets, all powered in series, energised by a single Pulse Forming Network (PFN) and terminated by a short circuit. The specification for the system requires a kick flattop of 7800 ns duration with a ripple of not more than ±0.5%. Recent measurements with beam show that the ±0.5% kick specification is achieved over the initial 7100 ns of the kick flattop; however the ripple over 7800 ns is ±0.7%. Electrical measurements have been carried out on each of the three magnets: these have been compared with the beam measurements and the contribution of each magnet to the detailed shape of the flattop kick has been determined. This paper reports the results of measurements and describes the plans to upgrade the system to fully meet the kick specification.  
 
TUPD006 The Injection and Extraction Kicker Circuits for the Elettra Booster kicker, injection, 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.  
 
TUPD014 Detailed Design, Manufacturing and Testing of a Strip-line Extraction Kicker for CTF3 Combiner Ring kicker, simulation, vacuum, impedance 1458
 
  • I. Rodriguez, L. García-Tabarés, E. Rodríguez García, F. Toral
    CIEMAT, Madrid
  • D. Alesini, A. Ghigo, F. Marcellini, M. Zobov
    INFN/LNF, Frascati (Roma)
  • T. Fowler, I. Syratchev
    CERN, Geneva
  The first calculations to design the CTF3 Combiner Ring extraction kicker are reported elsewhere. The last computing step before fabrication is the wakefield analysis, to determine if the bunch disturbance is acceptable. Two different codes have been used for cross-checking: CST Particle Studio and GDFidl. The computation is challenging because of the long structure (2.4 m) with a short bunch (3 mm). Besides, both transitions are not equal, because of different straight sections of the input and output beam pipe, and then the solution method is more complex. On the other hand, the main challenges for manufacturing are the long electrodes support via ceramic stand-offs and the flexible electrical connections to allow for electrodes thermal differential displacement. Special tooling has also been developed for assembly within the required tolerances. The device has been successfully leak tested. High frequency transmission coefficients and high voltage dielectric strength were also measured.  
 
TUPP049 Experimental Electron Cloud Studies in the CERN Proton Synchrotron electron, pick-up, vacuum, proton 1655
 
  • E. Mahner, F. Caspers, T. Kroyer
    CERN, Geneva
  Indications for a beam-induced electron cloud build-up are observed since 2000 for the nominal LHC beam in the PS to SPS transfer line and during the last turns before ejection from the PS. A new electron cloud setup was designed, built, and installed in the PS. It contains shielded button-type pickups, a dipole magnet, a vacuum gauge, and a dedicated stripline electrode to experimentally verify the beneficial effect of electron cloud clearing electrodes. During the 2007 run, the electron cloud effect was also clearly observed in the PS and efficient electron cloud suppression has been obtained for negative and positive bias voltages on the clearing electrode. Here, we present electron cloud measurements with different filling patterns and bunch spacings in the PS.  
 
TUPP050 Electron Cloud Mitigation by Fast Bunch Compression in the CERN PS electron, synchrotron, pick-up, proton 1658
 
  • H. Damerau, S. Hancock, T. Kroyer, E. Mahner, M. Schokker
    CERN, Geneva
  A fast transverse instability has been observed with nominal LHC beams in the CERN Proton Synchrotron (PS) in 2006. The instability develops within less than 1 ms, starting when the bunch length decreases below a threshold of 11.5 ns during the RF procedure to shorten the bunches immediately prior to extraction. An alternative longitudinal beam manipulation, double bunch rotation, has been proposed to compress the bunches from 14 ns to the 4 ns required at extraction within 0.9 ms, saving some 4.5 ms with respect to the present compression scheme. The resultant bunch length is found to be equivalent for both schemes. In addition, electron cloud and vacuum measurements confirm that the development of an electron cloud and the onset of an associated fast pressure rise are delayed with the new compression scheme. Beam dynamics simulations and measurements of the double bunch rotation are presented as well as evidence for its beneficial effect from the electron cloud standpoint.  
 
TUPP081 Longitudinal Wakefields and Impedance in the CSNS/RCS impedance, injection, 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)

 
 
TUPP085 Beam Dynamics Using Graphical Processing Units (GPUs) lattice, simulation, collimation, beam-transport 1727
 
  • R. Appleby, D. Bailey, M. D. Salt
    UMAN, Manchester
  Simulation of particle beam dynamics in accelerators is computationally expensive, and requires very high particle statistics and accuracy. Conventional beam tracking tools operate sequentially on particle phase space to compute the trajectories of particles through many turns of circular, and linear, machines. Graphical Processing Units (GPUs) utilise stream processing techniques to dramatically speed up parallel computational tasks, and offer considerable performance benefits to particle beam dynamics processing. In this paper, the stream processing beam dynamics code GPMAD is presented, which exploits the NVidia GPU processor, and demonstrates the considerable performance benefits to particle tracking calculations. The accuracy and speed of GPMAD is benchmarked using the Diamond Light Source BTS lattice, and the collimation system is evaluated.  
 
TUPP097 New Formalism in the Spin Tracking Code Spink synchrotron, quadrupole, resonance, radio-frequency 1756
 
  • A. U. Luccio, F. Lin
    BNL, Upton, Long Island, New York
  The code Spink*, in use for more than 10 years to track polarized hadrons in a synchrotron, was overhauled with the introduction of a new system of coordinates based on a generalized Frenet-Serret system in all dimensions in space, which allows a better treatment of the curvature of the reference orbit. Two more improvements are (a) treatment of tensor polarization for particles like polarized deuterons, and (b) inclusion of space charge and beam-beam effects, so the code can be used to track spin in synchrotrons with high luminosity like new generation colliders.

*A. U. Luccio. Proc. Adriatico Research Conf. on Trends in Colliders
Spin Physics. Trieste, Italy, 12/5-8, 1995.

 
 
TUPP115 Variable Energy Protontherapy FFAG Accelerator injection, 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.  
 
TUPP118 Update of an Accelerator Control System for the New Treatment Facility at HIMAC synchrotron, controls, ion, target 1800
 
  • Y. Iwata, T. Furukawa, K. Noda, T. Shirai, E. Takada
    NIRS, Chiba-shi
  • T. Kadowaki, Y. Sano, H. Uchiyama
    AEC, Chiba
  Tumor therapy using energetic carbon ions, as provided by the HIMAC, has been performed since June 1994, and more than 3200 patients were treated until now. With the successful clinical results over more than ten years, we started to construct a new treatment facility. The new facility would have three treatment rooms; two of them have both horizontal and vertical fixed-irradiation-ports, and the other has a rotating-gantry-port. For all the ports, a scanning irradiation method is applied. The new facility will be constructed in conjunction with the HIMAC, and heavy-ion beams will be provided by the HIMAC accelerators. To fulfill requirements for the scanning irradiation, we are planning to update the accelerator control system. The proposed control system would enable us to provide heavy ions having variable energies within a single synchrotron-pulse; the beam energy would be changed a few tenth of times within a pulse by an energy step corresponding to a water range of 2 mm. Since the beam range would be adjusted without using range compensators, an excellent irradiation field could be obtained. We will present our project on updating the accelerator control system.  
 
TUPP119 Lattice Design of a Carbon Ion Synchrotron for Cancer Therapy resonance, lattice, betatron, synchrotron 1803
 
  • H.-S. Kang, H. S. Suh
    PAL, Pohang, Kyungbuk
  A synchrotron accelerator for carbon ion cancer therapy was designed to be compact for a hospital based therapy facility. The circumference of the synchrotron is only 60 meter and the lattice is the FODO structure of 6 cells. Each cell has two dipole magnets with a angle of 30 degree. The lattice satisfies the requirement of Hardt condition for slow beam extraction which is to align the separatrices of different momenta of the particles.  
 
TUPP120 Current Status of the IBA C400 Cyclotron Project for Hadron Therapy cyclotron, proton, simulation, ion 1806
 
  • Y. Jongen, M. Abs, A. Blondin, W. J.G. M. Kleeven, D. Vandeplassche, S. Zaremba
    IBA, Louvain-la-Neuve
  • V. Aleksandrov, S. Gurskiy, G. A. Karamysheva, N. Yu. Kazarinov, S. A. Kostromin, N. A. Morozov, E. Samsonov, V. Shevtsov, G. Shirkov, E. Syresin, A. Tuzikov
    JINR, Dubna, Moscow Region
  Compact superconducting isochronous cyclotron C400 has been designed at IBA (Belgium) in collaboration with the JINR (Dubna). This cyclotron will be used for radiotherapy with proton, helium or carbon ions. 12C6+ and 4He2+ ions will be accelerated to 400 MeV/u energy and extracted by electrostatic deflector, H2+ ions will be accelerated to the energy 250MeV/u and extracted by stripping. We describe the parameters of the cyclotron, the current status of development work on the cyclotron systems. Reports on the status of the C400 project have been given regularly. Therefore, we will focus on the progress which has been achieved since recent reports in Cyclotron 2007 and EPAC 2006 conferences. The project will be ready to begin construction in the nearest future.  
 
TUPP123 SCENT300, A Superconducting Cyclotron For Hadrontherapy cyclotron, resonance, emittance, ion 1812
 
  • M. M. Maggiore, L. Calabretta, D. Campo, D. Garufi, L. A.C. Piazza, M. Re
    INFN/LNS, Catania
  • E. Samsonov
    JINR, Dubna, Moscow Region
  SCENT300 is a superconducting cyclotron able to deliver proton and C beam at 260 and 300 AMeV respectively. The study of the machine is near to be completed. The mechanical and magnetic design will be presented. The mechanical drawing and size of the cyclotron will be presented. The characteristics of the main coil and magnetic field will be presented. The method to change the magnetic setting for H2 and Carbon acceleration will be described. The acceleration system consisting of 4 RF cavities will be also described.  
 
TUPP125 New Heavy-ion Cancer Treatment Facility at HIMAC target, synchrotron, controls, ion 1818
 
  • K. Noda, T. Furukawa, T. Inaniwa, Y. Iwata, T. Kanai, M. Kanazawa, S. Minohara, S. Mori, T. Murakami, S. Sato, T. Shirai, E. Takada, Y. Takei, M. Torikoshi
    NIRS, Chiba-shi
  The first clinical trial of cancer treatment with carbon beams generated from the HIMAC was conducted in June 1994. Based on more than ten years of experience with HIMAC, we have proposed a new treatment facility for the purpose of further development of the heavy-ion cancer therapy with HIMAC. This facility, which is connected with the HIMAC synchrotron, consists of three treatment rooms: two rooms equipped with horizontal and vertical beam-delivery systems and one room with a rotating gantry. In both the fixed beam-delivery and rotating gantry systems, a 3D beam-scanning method is employed with gated irradiation with patient’s respiration in order to increase the treatment accuracy. Since the beam control for the size, the position and the time structure plays an essential role in the 3D beam scanning with the irradiation gated with respiration, the R&D study has been carried out with the HIMAC synchrotron since 2006. At December 2007, the Japanese government approved this project. We will report the design and R&D studies toward the construction of the new treatment facility.  
 
TUPP129 Accelerator Development for Advanced Particle Beam Therapy synchrotron, acceleration, proton, linac 1827
 
  • K. Saito, K. Moriyama, H. Nihongi, H. Nishiuchi, H. Sakurabata, S. Totake, M. Umezawa
    Hitachi, Ltd., Power & Industrial Systems R&D Laboratory, Ibaraki-ken
  Particle beam therapy has become one of the most effective modalities of cancer treatment. High reliability, high throughput and high precision irradiation are strongly demanded for the therapy system. In order to meet the requirements, we have developed several key technologies of synchrotron-based accelerator system, such as multi-harmonic RF acceleration, extracted beam intensity feedback, respiration-synchronized operation and beam tuning for spot scanning irradiation. Almost all these technologies have already been applied to the proton beam therapy system at M. D. Anderson Cancer Center. Beam specifications required for the spot scanning irradiation have successfully been achieved. In this paper, present status of the accelerator development will be described.  
 
WEPC052 Achieving Stability Requirements for Nanoprobe and Long Beam Lines at NSLS II. A Comprehensive Study site, ground-motion, acceleration, brightness 2109
 
  • N. Simos, L. Berman, A. J. Broadbent, K. Evans-Lutterodt, M. Fallier, J. Hill
    BNL, Upton, Long Island, New York
  Driven by beam stability requirements at the NSLS II synchrotron a comprehensive study has been launched seeking to provide assurances that nanometer level stability at critical x-ray beam-lines is achievable, given the vibration environment at the selected site. Through this effort which represents the integration of an array of field measurements and a state-of-the-art model of wave propagation, the stability of special NSLS II beam-lines that push the envelope of beam size is quantified. In particular, the effects of ground vibration at the NSLS II site are studied both deterministically and stochastically to account for the stochastic nature of the disturbances arriving at the site and interact with the ring and the experimental lines. Validated numerical models are utilized in an effort to guide the design of sensitive lines. The objective is to both minimize vibration amplification as well establish a relative stability envelope between the beam extraction and imaging locations of the sensitive NSLS II beam-lines.  
 
WEPC074 The Injection and Extraction Kicker Magnets of the Elettra Booster kicker, vacuum, injection, 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.  
 
WEPC077 Pulsed Magnet Systems for the SSRF Injection and Extraction kicker, injection, 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.  
 
WEPC083 Status of the SSRF Booster booster, injection, dipole, 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.  
 
WEPC090 Overview of the Status of the Elettra Booster Project booster, linac, injection, storage-ring 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.  
 
WEPC145 A Fast-sampling, Planar Array for Measuring the AC Field of Fermilab Pulsed Extraction Magnets linac, pick-up, dipole, booster 2350
 
  • J. DiMarco, C. Johnstone, O. Kiemschies, S. Kotelnikov, M. J. Lamm, A. Makulski, R. Nehring, D. F. Orris, A. D. Russell, M. Tartaglia, G. Velev, D. G.C. Walbridge, A. Yuan
    Fermilab, Batavia, Illinois
  A system employing a planar array of inductive pick-up coils has been developed for measurements of the rapidly changing dipole field in pulsed extraction magnets of the Fermilab MuCool project. The magnets are of C-type design, and have a peak field of 0.65 T during 8.33 millisecond half-sine pulse with 15 Hz repetition rate. The coils of the measurement system are fabricated on a single, 97.5 mm wide, 2-layer circuit board. The top layer of the circuit board has 15 unbucked coils distributed over its width. The bottom layer has a similar arrangement of coils, except each is bucked against the central winding to suppress the main dipole field and allow for more sensitive measurements of higher-order harmonics across the magnet mid-plane. The array of coils is simultaneously sampled at data rates of up to 100kHz with 10kHz bandwidth using 24-bit ADC’s. A detailed overview of the system and data analysis is presented, along with a characterization of results and system performance.  
 
WEPD010 Electronic Systems for the Protection of Superconducting Devices in the LHC dipole, insertion, quadrupole, power-supply 2422
 
  • R. Denz, K. Dahlerup-Petersen, K. H. Mess
    CERN, Geneva
  The Large Hadron Collider LHC incorporates an unprecedented amount of superconducting components: magnets, bus-bars, and current leads. Most of them require active protection in case of a transition from the superconducting to the resistive state, the so-called quench. The electronic systems ensuring the reliable quench detection and further protection of these devices have been developed and produced over the last years and are currently being put into operation. The paper will describe the various protection devices and hereby focus on the final test and commissioning phase of the system. First results from operation will be presented as well as an analysis of the system performance.  
 
WEPD028 Performance of the Superconducting Corrector Magnet Circuits during the Commissioning of the LHC acceleration, target, cryogenics, sextupole 2470
 
  • W. Venturini Delsolaro, V. Baggiolini, A. Ballarino, B. Bellesia, F. Bordry, A. Cantone, M. P. Casas Lino, C. CastilloTrello, N. Catalan-Lasheras, Z. Charifoulline, C. Charrondiere, G. D'Angelo, K. Dahlerup-Petersen, G. De Rijk, R. Denz, M. Gruwe, V. Kain, M. Karppinen, B. Khomenko, G. Kirby, S. L.N. Le Naour, A. Macpherson, A. Marqueta Barbero, K. H. Mess, M. Modena, R. Mompo, V. Montabonnet, D. Nisbet, V. Parma, M. Pojer, L. Ponce, A. Raimondo, S. Redaelli, V. Remondino, H. Reymond, A. Rijllart, R. I. Saban, S. Sanfilippo, K. M. Schirm, R. Schmidt, A. P. Siemko, M. Solfaroli Camillocci, H. Thiesen, Y. Thurel, A. Vergara-Fernández, A. P. Verweij, R. Wolf, M. Zerlauth
    CERN, Geneva
  • A. Castaneda, I. Romera Ramirez
    CIEMAT, Madrid
  • SF. Feher, R. H. Flora
    Fermilab, Batavia, Illinois
  The LHC is a complex machine requiring more than 7400 superconducting corrector magnets distributed along a circumference of 26.7 km. These magnets are powered in 1380 different electrical circuits with currents ranging from 60 A up to 600 A. Among the corrector circuits the 600 A corrector magnets form the most diverse and differentiated magnet circuits. About 60000 high current connections had to be made. A minor fault in a circuit or one of the superconducting connections would have severe consequences for the accelerator operation. All magnets are wound from various types of Nb-Ti superconducting strands, and many contain resistors to by-pass the current in case of the transition to the normal conducting state in case of a quench, and hence reduce the hot spot temperature. In this paper the performance of these magnet circuits is presented, focussing on the quench current and quench behaviour of the magnets. Quench detection and the performance of the electrical interconnects will be dealt with. The results as measured on the entire circuits will be compared to the test results obtained during the reception tests of the individual magnets.  
 
WEPD029 Performance of the Main Dipole Magnet Circuits of the LHC during Commissioning dipole, cryogenics, target, instrumentation 2473
 
  • A. P. Verweij, V. Baggiolini, A. Ballarino, B. Bellesia, F. Bordry, A. Cantone, M. P. Casas Lino, A. Castaneda, C. CastilloTrello, N. Catalan-Lasheras, Z. Charifoulline, G.-J. Coelingh, G. D'Angelo, K. Dahlerup-Petersen, G. De Rijk, R. Denz, M. Gruwe, V. Kain, B. Khomenko, G. Kirby, S. L.N. Le Naour, A. Macpherson, A. Marqueta Barbero, K. H. Mess, M. Modena, R. Mompo, V. Montabonnet, D. Nisbet, V. Parma, M. Pojer, L. Ponce, A. Raimondo, S. Redaelli, H. Reymond, D. Richter, A. Rijllart, I. Romera, R. I. Saban, S. Sanfilippo, R. Schmidt, A. P. Siemko, M. Solfaroli Camillocci, H. Thiesen, Y. Thurel, W. Venturini Delsolaro, A. Vergara-Fernández, R. Wolf, M. Zerlauth
    CERN, Geneva
  • SF. Feher, R. H. Flora
    Fermilab, Batavia, Illinois
  During hardware commissioning of the Large Hadron Collider, 8 main dipole circuits and 16 main quadrupole circuits are tested at 1.9 K and up to their nominal current. Each dipole circuit contains 154 magnets of 15 m length, and has a total stored energy of up to 1.1 GJ. Each quadrupole circuit contains 47 or 51 magnets of 5.4 m length, and has a total stored energy of up to 20 MJ. All magnets are wound from Nb-Ti superconducting Rutherford cables, and contain heaters to quickly force the transition to the normal conducting state in case of a quench, and hence reduce the hot spot temperature. In this paper the performance of these circuits is presented, focusing on the quench current and quench behaviour of the magnets. Quench detection, heater performance, operation of the cold bypass diodes, cryogenic recovery time, electrical joints, and possible magnet-to-magnet quench propagation will be dealt with. The results as measured on the entire circuits will be compared to the test results obtained during the reception tests of the individual magnets.  
 
WEPD036 Radiation and Thermal Analysis of Superconducting Quadrupoles in the Interaction Region of Linear Collider quadrupole, radiation, shielding, linear-collider 2488
 
  • A. V. Zlobin, A. I. Drozhdin, V. Kashikhin, V. S. Kashikhin, M. L. Lopes, N. V. Mokhov
    Fermilab, Batavia, Illinois
  • A. Seryi
    SLAC, Menlo Park, California
  The upcoming and disrupted electron and positron beams in the baseline design of ILC interaction region are focused by compact FD doublets each consisting of two small-aperture superconducting quadrupoles and multipole correctors. These magnets will work in a severe radiation environment generated primarily by incoherent pairs and radiative Bhabhas. This paper analyzes the radial, azimuthal and longitudinal distributions of radiation heat deposition in incoming and disrupted beam doublets. Operation margins of baseline quadrupoles based on NbTi superconductor and direct wind technology as well as alternative designs based on NbTi or Nb3Sn Rutherford cables are calculated and compared. The possibilities of reducing the heat deposition in magnet coils using internal absorbers are discussed.  
 
WEPP010 Scheduling the Powering Tests cryogenics, superconducting-magnet, instrumentation, simulation 2545
 
  • K. Foraz, E. Barbero-Soto, B. Bellesia, M. P. Casas Lino, C. Fernandez-Robles, M. Pojer, R. I. Saban, R. Schmidt, M. Solfaroli Camillocci, A. Vergara-Fernández
    CERN, Geneva
  The Large Hadron Collider is now entering in its final phase before receiving beam, and the activities at CERN between 2007 and 2008 have shifted from installation work to the commissioning of the technical systems (“hardware commissioning”). Due to the unprecedented complexity of this machine, all the systems are or will be tested as far as possible before the cool-down starts. Systems are firstly tested individually before being globally tested together. The architecture of LHC, which is partitioned into eight cryogenically and electrically independent sectors, allows the commissioning on a sector by sector basis. When a sector reaches nominal cryogenic conditions, commissioning of the magnet powering system to nominal current for all magnets can be performed. This paper briefly describes the different activities to be performed during the powering tests of the superconducting magnet system and presents the scheduling issues raised by co-activities as well as the management of resources.  
 
WEPP037 Independent Component Analysis of Tevatron Turn-by-turn BPM Measurements betatron, synchrotron, collider, optics 2602
 
  • A. V. Petrenko
    BINP SB RAS, Novosibirsk
  • V. A. Lebedev, A. Valishev
    Fermilab, Batavia, Illinois
  Transverse dipole coherent beam oscillations in the Tevatron were analyzed with different independent component analysis algorithms. This allowed to obtain the model-independent values of coupled beta-functions as well as betatron phase advance and dispersion along the ring from a single kick measurement. Using a 1-turn shift of turn-by-turn BPM readings for virtual doubling of the number of BPMs it is also possible to measure the fractional part of betatron tunes with high accuracy. Good agreement with the linear optical model of the Tevatron was observed.  
 
WEPP057 Fitting Algorithms for Optical and Beam Parameters in Transfer Lines with Application to the LHC Injection Line TI2 emittance, optics, quadrupole, injection 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.  
 
WEPP059 Automatic Post-operational Checks for the LHC Beam Dump System kicker, dumping, diagnostics, controls 2653
 
  • E. Gallet, J. Axensalva, V. Baggiolini, E. Carlier, B. Goddard, V. Kain, M. Lamont, N. Magnin, J. A. Uythoven, H. Verhagen
    CERN, Geneva
  In order to ensure the required level of reliability of the LHC beam dump system a series of internal post-operational checks after each dump action must be performed. Several data handling and data analysis systems are required internally and at different levels of the LHC control system. This paper describes the data acquisition and analysis systems deployed for post-operational checks, and describes the experience from the commissioning of the equipment where these systems were used to analyse the dump kicker performance.  
 
WEPP063 R-matrices of the Fast Beam Extraction Section of AGS kicker, quadrupole, synchrotron, optics 2662
 
  • N. Tsoupas, L. Ahrens, J. W. Glenn, W. W. MacKay, T. Satogata
    BNL, Upton, Long Island, New York
  The Fast Beam Extraction (FEB) system of the Alternating Gradient synchrotron (AGS) extracts the beam bunches from AGS into the AGS-to-RHIC (AtR) beam transfer line, and the extracted bunches are injected into the Relativistic Heavy Ion Collider (RHIC) synchrotron. In a particular section of the beam extraction line the beam bunches are transported through the fringe field region of three main AGS magnets. Optical characteristics of this section change with trajectory and momentum. Therefore the calculation of the R-matrices in this part of the extraction line requires special attention. To describe accurately the R-matrices, the magnetic field of the AGS main magnets was measured on the median plane of the AGS magnet in both, the circulating beam region and the fringe field region, where the extracted beam is transported. Using these magnetic field maps we describe the procedure we use to calculate the R-matrices at the beam extraction region. These R-matrices are used to calculate the beam parameters at the starting point of the AtR beam transfer line and the required quadrupole settings to match to RHIC’s acceptance.  
 
WEPP064 Apertures in the LHC Beam Dump System and Beam Losses during Beam Abort kicker, simulation, vacuum, dumping 2665
 
  • T. Kramer, B. Goddard, M. Gyr, A. Koschik, J. A. Uythoven, Th. Weiler
    CERN, Geneva
  The LHC beam dump system is used to dispose accelerated protons and ions in a wide energy range from 450 GeV up to 7 TeV. An abort gap of 3 microseconds is foreseen to avoid sweeping particles through the ring aperture. This paper gives a brief overview of the critical apertures in the extraction region and the two beam dump lines, and presents MAD-X tracking studies made to investigate the impact of particles swept through the aperture due to extraction kicker failures or spurious particles within the abort gap.  
 
WEPP065 Beam Commissioning of the SPS-to-LHC Transfer Line TI 2 radiation, optics, proton, controls 2668
 
  • J. A. Uythoven, G. Arduini, R. W. Assmann, N. Gilbert, B. Goddard, V. Kain, A. Koschik, T. Kramer, M. Lamont, V. Mertens, S. Redaelli, J. Wenninger
    CERN, Geneva
  The transfer line for the LHC Ring 1 was successfully commissioned with beam in the autumn of 2007. After extraction from the SPS accelerator and about 2.7 km of new transfer line, the beam arrived at the temporarily installed beam dump, about 50 m before the start of the LHC tunnel, without the need of any beam threading. This paper gives an overview of the hardware commissioning period and the actual beam tests carried out. It summarises the results of the beam test optics measurements and the performance of the installed hardware.  
 
WEPP066 Results from the LHC Beam Dump Reliability Run dumping, kicker, vacuum, injection 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.  
 
WEPP082 Recirculator SALO Project in NSC KIPT electron, injection, target, 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.  
 
WEPP102 Design of the ILC RTML Extraction Lines kicker, collimation, damping, focusing 2752
 
  • S. Seletskiy, P. Tenenbaum, D. R. Walz
    SLAC, Menlo Park, California
  • N. Solyak
    Fermilab, Batavia, Illinois
  The Damping Ring to the Main Linac beamline (RTML) is equipped with three extraction lines (EL). Each EL can be used both for an emergency abort dumping of the beam and the tune-up continual train-by-train extraction. Two of the extraction lines are located downstream of the first and second stages of the RTML bunch compressor, and must accept both compressed and uncompressed beam with energy spread of 2.5 % and 0.15 % respectively. In this paper we report optical design that allowed us to minimize the length of the extraction lines while offsetting the beam dumps from the main line by the distance required for acceptable radiation level in the service tunnel. Proposed extraction lines can accommodate beams with different energy spreads at the same time providing the beam size suitable for the aluminum dump window.  
 
WEPP131 RF-breakdown Experiments at the CTF3 Two-beam Test-stand ion, electron, dipole, vacuum 2800
 
  • M. Johnson, T. J.C. Ekelöf, R. J.M. Y. Ruber, V. G. Ziemann
    UU/ISV, Uppsala
  • H.-H. Braun
    CERN, Geneva
  The Two-beam Test-stand (TBTS) in the CLIC Test Facility CTF3 offers unique possibilities to conduct RF-breakdown related experiments on the accelerating structures and the power extraction and transfer structures with beam. We report on the set-up of two such experiments, one for the measurement of the transverse kick and the other for the measurement of positive ion currents. The purpose of the transverse kick measurements is to determine the effects of a RF-breakdown event on the beam. Five BPMs in the TBTS will be used to study the trajectory of a pulse train after a RF-breakdown event, with important implications for the operation of CLIC. Ion currents ejected from accelerating structures during RF-breakdown events have already been observed at the 30 GHz test stand at the present test facility. Results and their implications for RF-breakdown physics are presented, as well as plans for similar measurements at the TBTS.  
 
WEPP132 Efficiency Enhancement of Active High-Power Pulse Compressors coupling, controls, plasma 2803
 
  • S. V. Kuzikov, Yu. Danilov, A. A. Vikharev
    IAP/RAS, Nizhny Novgorod
  High power microwaves needed to accelerate particles in multi-TeV colliders can be produced using active pulse compressors. An active compressor has a storage cavity whose Q-factor is modulated by means of RF switch. An efficiency of such compressor is limited due to diffraction losses at power accumulation regime and in conventional case does not exceed 81.4%. A new microwave pulse compressor operated with a superposition of quasi-degenerated modes is suggested. A proper choice of eigen frequencies and Q-factors of these modes allows essential enhancement of efficiency (asymptotically up to 100%). A 30 GHz project of multi-megawatt compressor based on dual-mode circular cross-section cavity is considered.  
 
THXG03 Upgrades to ISIS for the New Second Target Station target, proton, synchrotron, septum 2902
 
  • J. W.G. Thomason
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  The new ISIS Second Target Station (TS-2) represents a major enhancement of the capabilities of the successful ISIS spallation neutron source, and correspondingly major enhancements have had to be made to the accelerator systems. As well as providing an outline of the new target station itself, the talk will describe the new dual harmonic RF system for the ISIS synchrotron which significantly increases the accelerated beam current to meet the needs of TS-2, and also the new proton beam transport line which diverts one out of every five pulses from the synchrotron to TS-2. In addition, the talk will summarise the substantial upgrades that have had to be made elsewhere on the ISIS accelerator system to underpin operation for at least another fifteen years, and will address possible future upgrades.  
slides icon Slides  
 
THYG01 The ILC Beam Delivery System Design and R&D Programme collimation, collider, linear-collider, instrumentation 2907
 
  • T. Tauchi
    KEK, Ibaraki
  The presentation will describe recent developments for the ILC beam delivery system. Special emphasis will be given to the R&D programme at existing and planned test facilities.  
slides icon Slides  
 
THPC011 The CR-RESR Storage Ring Complex of the FAIR Project dynamic-aperture, antiproton, injection, 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.  
 
THPC047 Studies of Losses During Continuous Transfer Extraction at the CERN proton Synchrotron simulation, septum, proton, quadrupole 3083
 
  • S. S. Gilardoni, J. Barranco
    CERN, Geneva
  Proton beams can be extracted from the CERN-PS at 14 GeV/c on five turns, using a technique called Continuous Transfer (CT). In this case, large losses due to particles scattered by an electrostatic septum used to slice the beam on five turns are observed in straight sections where the machine aperture is large enough to accommodate the circulating beam without any loss. These losses limit the maximum intensity deliverable to the SPS, like for the CERN to Gran Sasso (CNGS) neutrino program, because of the large irradiation of the site outside the PS tunnel and at the CERN fence. New simulation tools for a parametric study have been developed to improve the understanding of the observed loss pattern. A proposed solution to displace the losses in less critical section of the machine has been simulated and implemented in the CERN-PS. Simulations and experimental results of the loss study and reduction are presented.  
 
THPC049 Progress in the Beam Preparation for the Multi-turn Extraction at the CERN Proton Synchrotron octupole, sextupole, proton, resonance 3089
 
  • S. S. Gilardoni, F. Franchi, M. Giovannozzi
    CERN, Geneva
  A new type of extraction based on beam trapping inside stable islands in the horizontal phase space will become operational during 2008 at the CERN Proton Synchrotron. A series of beam experiments was carried out to prove loss-less capture with high intensity and multi-bunched beams, up to 1500·1010 protons per pulse, in preparation of the extraction commissioning. These fundamental steps for the new Multi-turn Extraction are presented and discussed in details.  
 
THPC052 Beam Losses and Collimation Considerations for PS2 collimation, injection, beam-losses, 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.  
 
THPC056 Stability Change of Fourth-order Resonance with Application to Multi-turn Extraction Schemes resonance, simulation, emittance, synchrotron 3110
 
  • M. Giovannozzi, D. Quatraro
    CERN, Geneva
  • G. Turchetti
    Bologna University, Bologna
  Recently, a novel multi-turn extraction scheme was proposed, based on particle trapping inside stable resonances. Numerical simulations and experimental tests confirmed the feasibility of such a scheme for low order resonances. While the 3rd order resonance is generically unstable and those higher than 4th order are generically stable, the 4th order resonance can be either stable or unstable depending on the details of the system under consideration. By means of the normal form approach a general formula to control the stability of the 4th order resonance is derived. Numerical simulations confirm the analytical results and show that by crossing the unstable 4th order resonance the region around the centre of phase space is depleted and particles are trapped only in the four stable islands. This indicates that a four-turn extraction could be envisaged based on this technique.  
 
THPC114 Design and Performance of a Prototype Digital Feedback System for the International Linear Collider Interaction Point feedback, kicker, linear-collider, collider 3245
 
  • P. Burrows, B. Constance, H. Dabiri Khah, J. Resta-López
    JAI, Oxford
  • R. Apsimon, P. Burrows, C. I. Clarke, A. F. Hartin, C. Perry, C. Swinson
    OXFORDphysics, Oxford, Oxon
  • G. B. Christian
    ATOMKI, Debrecen
  • A. Kalinin
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  We present the design and preliminary results of a prototype beam-based digital feedback system for the Interaction Point of the International Linear Collider. A custom analogue front-end processor, FPGA-based digital signal processing board, and kicker drive amplifier have been designed, built, and tested on the extraction line of the KEK Accelerator Test Facility (ATF). The system was measured to have a base latency of approximately 140 ns, increasing to approximately 148 ns with the inclusion of real-time charge normalisation.  
 
THPC133 Layout and Simulations of the FONT System at ATF2 kicker, simulation, feedback, pick-up 3300
 
  • J. Resta-López, P. Burrows
    JAI, Oxford
  We describe the adaptation of a Feedback On Nano-second Timescales (FONT) system for the final focus test beam line ATF2 at KEK. This system is located in the ATF2 extraction line, and is mainly conceived for cancellation of transverse jitter positions originated in the damping ring and by the extraction kickers. This jitter correction is performed by means of a combination of feed-forward (FF) and fast-feedback (FB) beam stabilisation. We define optimal positions for the kicker and BPM pairs of the FONT FF/FB system, and estimate the required kicker performance and BPM resolutions. Moreover simulation results are presented.  
 
THPC144 A Beam Quality Monitor for LHC Beams in the SPS dipole, luminosity, injection, 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.  
 
THPC151 The Post-Mortem Analysis Software Used for the Electrical Circuit Commissioning of the LHC controls, superconducting-magnet, quadrupole, instrumentation 3345
 
  • H. Reymond, O. O. Andreassen, C. Charrondiere, D. Kudryavtsev, P. R. Malacarne, E. Michel, A. Raimondo, A. Rijllart, R. Schmidt, N. Trofimov
    CERN, Geneva
  The hardware commissioning of the LHC has started in the first quarter of 2007, with the sector 7-8. A suite of software tools has been developed to help the experts with the access, visualization and analysis of the result of the tests. Using the experience obtained during this phase and the needs to improve the parallelism and the automation of the electrical circuits commissioning, a new user interface has been defined to have an overview of all pending tests and centralise the access to the different analysis tools. This new structure has been intensely used on sector 4-5 and during this time the test procedures for different types of electrical circuits have been verified, which has also allowed the implementation of new rules and features in the associated software. The hardware commissioning of the electrical circuits enters in a more critical phase in 2008, were the number of the tests executed increases rapidly as test will be performed in parallel on different sectors. This paper presents an overview on the post mortem analysis software, from its beginning as a simple graphical interface to the actual suite of integrated analysis tools.  
 
THPC153 Timing System of the New Elettra Injector booster, injection, 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.  
 
THPP001 Development of FFAG Electron Accelerator septum, electron, acceleration, induction 3372
 
  • T. Baba, M. Takahashi, Y. Yuasa
    NHVC, Kyoto
  • Y. Mori
    KURRI, Osaka
  Electron Beam (EB) Accelerators have been used in the many industrial fields to improve physical properties of the material. Examples are wire and cable industries, rubber tire industries, foam industries, etc. EB is also widely used for medical device sterilization as a popular tool. High power, high reliability, compactness and low cost are key requirements to get popularity of the technology and to open up its application fields. The paper will present FFAG electron accelerator to meet these requirements that NHV Corporation recently developed and some of the interesting performance such as beam extraction efficiency will be discussed in the paper.  
 
THPP004 EMMA - the World's First Non-scaling FFAG acceleration, injection, 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.  
 
THPP006 Injection and Extraction for the EMMA NS-FFAG injection, 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.  
 
THPP009 Injection and Extraction Orbits and Twiss Parameters for the EMMA Ring injection, 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.  
 
THPP015 Design of a Versatile Injector for a Low-energy Experimental Platform at KACST ion, ion-source, storage-ring, injection 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.  
 
THPP016 Preliminary Design of a Highly-flexible Extraction Scheme for the USR lattice, septum, antiproton, storage-ring 3407
 
  • Ph. Schmid, K.-U. Kuehnel, C. P. Welsch
    MPI-K, Heidelberg
  • A. I. Papash
    JINR, Dubna, Moscow Region
  In the future Facility for Low-energy Antiproton and Ion Research (FLAIR) at GSI, the Ultra-low energy electrostatic Storage Ring (USR) will provide cooled beams of antiprotons and possibly also highly charged ions down to energies of only 20 keV/q. Beams with small momentum spread and low emittance will enable a wide range of hitherto impossible experiments. The large variety of planned experiments requires a highly flexible longitudinal time structure of the extracted bunches, ranging from ultra-short pulses in the nanosecond regime to quasi DC beams. In this contribution, a preliminary design of the extraction scheme is presented. Furthermore, possible solutions for the compensation of effects from the extraction region on the very-low energy beam are shown, including results from beam transport calculations.  
 
THPP021 Status of the Unilac-upgrade Programme for the Heavy Element Research at GSI-Ship rfq, ion, ion-source, heavy-ion 3416
 
  • P. Gerhard, W. Barth, L. A. Dahl, K. Tinschert
    GSI, Darmstadt
  • A. Schempp
    IAP, Frankfurt am Main
  For more than 30 years the heavy-element research using the velocity separator SHIP is one of the major experiments at GSIs heavy ion linear accelerator UNILAC. On of the major contributions which led to the discovery of six new elements since 1981 is the perpetual effort to increase the beam intensity. Since the early 1990's the beam current available was raised significantly by a number of improvements concerning the source, the LEBT and the accelerator. The next steps are scheduled for 2009 and include an upgrade of the Radio Frequency Quadrupole-accelerator (RFQ) and a new superconducting 28 GHz-ECR ion source. The new RFQ will allow higher duty factors up to 100% and improve the longitudinal beam quality as well as the beam transmission. The new ion source will provide an increase in beam intensity and simultaneously higher charge states. The new source will be installed in addition to the existing one, therefore a second LEBT-system has to be designed and integrated into the High Charge State Injector. This paper presents the status quo of both the RFQ and the ion source upgrade and will provide technical data.  
 
THPP060 Simultaneous Extraction of Two Stable Beams for ISAC cyclotron, target, feedback, resonance 3503
 
  • G. Dutto, R. A. Baartman, P. G. Bricault, I. V. Bylinskii, A. Hurst, R. E. Laxdal, Y.-N. Rao, L. W. Root, P. Schmor, G. M. Stinson
    TRIUMF, Vancouver
  • J. M. Schippers
    PSI, Villigen
  The TRIUMF cyclotron was originally conceived for several proton beams extracted simultaneously at different energies. Recent operation includes a 500 MeV beam up to150 μA for meson users, a 500 MeV beam up to 80 μA for rare isotope production, and a 100 MeV beam up to 70μA for medical isotopes. The extraction of an additional high intensity proton beam, at an energy between 450 and 500 MeV for ISAC has now been given priority. With the rare ions produced from the existing and future primary beam lines, we will be able to operate two of the existing experimental areas simultaneously. Upgrading the cyclotron for higher intensity is in progress. A necessary goal for ISAC is the extraction of both primary proton beams with stability better than 1% to allow the highest possible temperatures to be reliably maintained at the ion production targets. A successful solution implemented for the existing primary ISAC beam has been simulated to be adaptable for both primary beams, given the particular angular separation between the two strippers in the cyclotron. Progress on intensity and stability studies and the layout of the extraction system will be presented.  
 
THPP063 Possible Particle Distributions at the Entrance of the Cyclotron Spiral Inflector emittance, cyclotron, ion, simulation 3506
 
  • N. Yu. Kazarinov, I. A. Ivanenko
    JINR, Dubna, Moscow Region
  The transverse particle distribution of the ion beam produced in the Electron Cyclotron Resonance Ion Source (ECRIS) is considered. It is shown that the beam emittance at the entrance of the cyclotron spiral inflector is strongly dependent on directions of both the ECRIS and cyclotron magnetic fields. The changing of the beam rms emittance and bunch lengthening in the spiral inflector for every considered distribution are obtained in the computer simulation.  
 
THPP068 Acceleration in spiral FFAG using field map data acceleration, injection, 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.  
 
THPP069 Status of the Superconducting Ring Cyclotron at RIKEN RI Beam Factory cyclotron, ion, acceleration, heavy-ion 3518
 
  • K. Yamada, M. K. Fujimaki, N. Fukunishi, A. Goto, H. Hasebe, K. Ikegami, O. Kamigaito, M. Kase, K. Kumagai, T. Maie, M. Nagase, J. Ohnishi, N. S. Sakamoto, Y. Yano, S. Yokouchi
    RIKEN, Wako, Saitama
  • H. Okuno
    RIKEN/RARF/CC, Saitama
  A superconducting ring cyclotron (SRC) was successfully commissioned to work as the final energy booster of the RI beam factory (RIBF) in RIKEN. SRC is the world's first ring cyclotron that uses superconducting magnets, and has the strongest beam bending force among the cyclotrons. It can boost the ion beam energy up to 440 MeV/nucleon for light ions and 350 MeV/nucleon for very heavy ions such as uranium nuclei to produce intense radioactive beams. The ring cyclotron consists of 6 major superconducting sector magnets with a maximum field of 3.8T. The total stored energy is 240MJ, and its overall sizes are 19 m diameter, 8 m height and 8,100 tons. The magnet system assembly was completed in August 2005, and successfully reached the maximum field in November 2005. After magnetic field measurements for two months, the other hardware than the superconducting magnets was installed. The first beam was extracted from SRC on 12/28/2006. From May 2007 we started to supply uranium beams to nuclear scientist to produce RI beams. This talk will describe the milestones that were achieved during the commissioning as well as some of the issues that still need to be resolved.  
 
THPP070 Status of Center for Accelerator and Beam Applied Science of Kyushu University kicker, proton, cyclotron, septum 3521
 
  • Y. Yonemura, H. Arima, N. Ikeda, K. Ishibashi, H. Ishikawa, K. Maehata, T. Okai, N. Shigyo, Y. Uozumi, G. Wakabayashi
    Kyushu University, Department of Applied Quantum Physics and Nuclear Engineering, Fukuoka
  • S. Fukumoto, Y. Kimura, H. Nakayama, A. Takagi
    KEK, Ibaraki
  • Y. Mori
    KURRI, Osaka
  • T. Noro, K. Sagara
    Kyushu University, Fukuoka
  • T. Tomimasu
    SAGA, Tosu
  A new accelerator facility of Center for Accelerator and Beam Applied Science is under construction on Ito Campus to promote research and education activities at Kyushu University. The facility consists mainly of a 10 MeV proton cyclotron as an injector and a 150 MeV Fixed Field Alternating Gradient (FFAG) accelerator, which was developed at KEK as a prototype of proton FFAG for various applications. In this paper, the status of the development of devices and the facility is described.  
 
THPP085 Status of the SNS Ring Power Ramp Up target, beam-losses, injection, 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.  
 
THPP088 Design Considerations for the PS2 Beam Dumps injection, 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, emittance, injection 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.  
 
THPP097 Commissioning Results of the Kicker Magnet in J-PARC RCS kicker, power-supply, proton, impedance 3590
 
  • J. Kamiya, M. Kinsho, M. Kuramochi, T. Takayanagi, T. Togashi, T. Ueno, M. Watanabe, M. Yoshimoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  Installation of the kickers in the extraction section of the RCS in J-PARC facility was completed. And they succeeded to extract the 3GeV proton beams in the first beam test. The operation parameters of the kickers agreed well with the parameters which were estimated from the magnetic field measurement and the current test of the power supplys. In this report, we summarized the results of the excitation test and the commissioning of the kicker magnet. The results of the magnetic field measurement showed the good uniformity in the wide range of the aperture. The characteristic feature of each kicker power supply was also measured precisely. Although the rise time and jitter of the output pulse have some minor variation due to the different characteristics of the thyratrons, the degree of variation was acceptably small. Combining the results of the magnetic field measurements, the relation between the charging voltage and the magnetic field was obtained for each kicker. The accelerated beam was successfully extracted at the operation parameters which were obtained from the relationship. The measurements result which was obtained by using the beam is also reported.  
 
THPP101 Investigation of Lifetime of the Electronics and the Fiber Optics inside the Niche and the Tunnel in the Slow Extraction Area of SIS100 ion, simulation, antiproton, optics 3599
 
  • A. B. Plotnikov, E. Mustafin, N. Pyka, P. J. Spiller
    GSI, Darmstadt
  The loss of ions in the slow extraction area of the SIS100 accelerator project at FAIR can be dangerous for the electronic equipment and fiber optics situated inside the tunnel and niches around. During the slow extraction lost ions irradiate the yoke of the quadrupole magnets and collimator and produce a neutrons flux, which can damage or make single event upset at the electronic devices. Also fiber optic cores fade under the action of irradiation. In the current work the investigation of the dose distribution and neutron fluxes, as well as the calculation of the lifetime of the electronics and fiber optics in different places of the tunnel have been done. By using these results the design of the niches and shielding is planned.  
 
THPP102 Radiation Damage Studies for the Slow Extraction from SIS100 quadrupole, septum, ion, beam-losses 3602
 
  • A. Smolyakov
    ITEP, Moscow
  • E. Mustafin, N. Pyka, P. J. Spiller
    GSI, Darmstadt
  During the slow extraction from SIS100 synchrotron 5% of the beam will hit the wires of the electrostatic septum and will be lost. These losses produce very high radiation damage to the superconducting quadrupole doublet situated downstream of the extraction point. These beam losses were simulated with the help of Fluka code for U28+ and Ne5+ beams. Non-zero cross-section and non-zero angular divergence were assumed for the lost beam, allowing distributed modeling of the slow extraction losses. The radiation damage to different layers of the superconducting quadrupole cables was calculated. The lifetime of the s.c. cables of the quadrupoles was found to be too short. Thus, alternative quadrupole designs with higher radiation tolerances were investigated: with stainless steel shielding of the s.c. cables and with a gap in the mid-plane between the s.c. cables.  
 
THPP103 Design of the Beam Extraction System of the New Heavy Ion Synchrotrons SIS100 and SIS300 at FAIR septum, kicker, quadrupole, sextupole 3605
 
  • N. Pyka, U. B. Blell, P. J. Spiller, J. Stadlmann
    GSI, Darmstadt
  The proton and heavy ion synchrotrons SIS100 and SIS300 are the heart of the new FAIR facility which is under construction on the site of the present GSI. All ions from protons to uranium will be accelerated up to a magnetic rigidity of 100 Tm and 300 Tm, respectively. The design of the beam extraction system of both synchrotrons is completed and will be presented in this paper. The extraction devices of both synchrotrons are situated in one common straight section and deflect the beam vertically. SIS100 has been optimized for fast extraction by means of a distributed fast bipolar kicker system. However, slow extraction over a few seconds is also foreseen. SIS300 has been optimized for slow extraction and may generate spills of up to 100s. The slow extraction channel combines horizontal deflection by an electrostatic septum in the first stage with vertical deflection by a Lambertson septum magnet and subsequent magnetic extraction septa in the second stage. An emergency beam dumping system could be integrated in the extraction system of both machines.  
 
THPP104 The High Energy Beam Transport System for FAIR beam-transport, diagnostics, dipole, ion 3608
 
  • S. Ratschow, F. Hagenbuck, P. J. Spiller
    GSI, Darmstadt
  The High Energy Beam Transport System of FAIR, with a total length of more than 2350 m, forms a complex system connecting seven accelerator- and storage-rings, the experimental caves, beam dumps, stripping stations, the antiproton target and the Super-FRS. The variety of beams to be transported is considerable, ranging from slow extracted beams with long spills of up to 100 s to short intense bunches with lengths of a few nanoseconds and a momentum spread of up to ±1%. The range of beam intensity covers more than six orders of magnitude. The SIS100/300 rings are located 13.5 m under ground while the rest of the facility is essentially on ground level necessitating a 3-dimensional layout of the beam line system. Most of the beam transport system consists of normal conducting magnets. However, the SIS300 beam line system has to be built with superconducting magnets. Due to the large variety of beam parameters, a careful planning of the beam diagnostics system is important. The paper summarizes the design fundamentals and the current status of the system design.  
 
THPP105 Beam Commissioning Results of the RCS Injection and Extraction at J-PARC injection, 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, vacuum, proton, injection 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.  
 
THPP134 Injection and Extraction DC Magnets Power Supplies for 3GeV Rapid Cycling Synchrotron of J-PARC power-supply, septum, injection, 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.