A   B   C   D   E   F   G   H   I   K   L   M   O   P   Q   R   S   T   U   V   W   X    

septum

Paper Title Other Keywords Page
TUPLS012 Dynamic Stresses in the LHC TCDS Diluter from 7 TeV Beam Loading simulation, LHC, extraction, LEFT 1511
 
  • B. Goddard, A. Presland, W.J.M. Weterings
    CERN, Geneva
  • L. Massidda
    CRS4, PULA
  In the event of an unsynchronised beam abort, the MSD extraction septum of the LHC beam dumping system is protected from damage by the TCDS diluter. The simultaneous constraints of obtaining sufficient beam dilution while ensuring the survival of the TCDS make the design difficult, with high thermally induced dynamic stresses occurring in the material needed to attenuate the particle showers induced by the primary beam impact. In this paper, full 3D simulations are described where the worst-case beam loading has been used to generate the local temperature rise and to follow the resulting time evolution of the mechanical stresses. The results and the accompanying design changes for the TCDS, to provide an adequate performance margin, are detailed.  
 
TUPLS076 Beam Extraction of 150 MeV FFAG extraction, kicker, power-supply, KEK 1672
 
  • M. Aiba, Y. Mori, H. Nakayama, K. Okabe, Y. Sakamoto, A. Takagi
    KEK, Ibaraki
  • R. Taki
    GUAS/AS, Ibaraki
  • Y. Yonemura
    Kyushu University, Fukuoka
  A beam extraction from FFAG accelerator was performed for the first time at KEK 150MeV proton FFAG synchrotron. The purpose of 150MeV FFAG project is to establish a working prototype for various applications. The beam extraction is thus one of important goals. The extraction is based on fast extraction methode using kicker and pulse septum working at 100Hz. A rapid cycling is also our focus to take advantages of FFAG accelerator. Beam extraction experiment was successful under 100Hz operating. The details of experiment will be presented in this paper.  
 
TUPLS107 Operation of the Opposite-Field Septum Magnet for the J-PARC Main-Ring Injection injection, vacuum, power-supply, dipole 1750
 
  • I. Sakai, Y. Arakaki, K. Fan, Y. Saito, M. Tomizawa, M. Uota
    KEK, Ibaraki
  • A.K. Kawasaki, H. Mori, A. Tokuchi
    NICHICON, Shiga
  • Y. Morigaki, A. Nishikawa
    IHI/Yokohama, Kanagawa
  The opposite field septum magnet system has been applied to the injection system of the J-PARC 50-GeV proton synchrotron. The features of the system are a force-free structure, easy pulse excitation and the possibility of a large-aperture, thin-septum structure. The septum magnet has the structure of an inside-vacuum to eliminate the thickness of the vacuum-chamber walls and electric-insulation layer to make the septum thickness as thin as possible. However the magnet cores and return coils are outside of the vacuum to reduce the out-gassing rate of the vacuum system. Finally, the larger beam aperture than the full acceptance of the ring and larger separation angle can be obtained at the septum magnet for low-loss injection. In this paper we will introduce the methods to eliminate the error fields caused by fabrication errors and eddy current with pulse excitation and stability of high current power supply of 50 kA.  
 
TUPLS113 Designs of Septum Magnet at 3 GeV RCS in J-PARC vacuum, injection, shielding, extraction 1768
 
  • M. Yoshimoto, Y. Irie, J. Kamiya, M. Kinsho, T. Takayanagi, O. Takeda, M. Watanabe
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • H. Fujimori, S. Igarashi, H. Nakayama
    KEK, Ibaraki
  3 GeV RCS (Rapid Cycling Synchrotron) at J-PARC (Japan Proton Accelerator Research Complex) consists in many kinds of septum magnets. There are two septum magnets to inject the beam into the ring, three septum magnets to extract the beam for the users, and two septum magnets to dump the beam which can not be exchanged its charge at the first foil. In order to reduce the magnetic leakage field from the septum magnets at the beam orbit in the ring, the silicon steel sheets are set at the outside of the septum magnets for the magnetic shields. However sufficient spaces to set the thick magnetic shields are not securable at the divergent duct areas. Therefore the vacuum chambers are made by the magnetic stainless steel and the leakage fields in the chambers can be reduced. As results of the 3D field calculations by TOSCA, the magnetic leakage field can be suppressed to a few Gauss or less.  
 
TUPLS116 Extraction System Design for the CSNS/RCS kicker, extraction, shielding, lattice 1777
 
  • J. Tang, Y. Chen, Y.L. Chi, Y.L. Jiang, W. Kang, J.B. Pang, Q. Qin, S. Wang, W. Wang
    IHEP Beijing, Beijing
  • J. Wei
    BNL, Upton, Long Island, New York
  The CSNS extraction system takes use one of the four dispersion-free straight sections. Five vertical kickers and one Lambertson septum magnet are used for the one-turn extraction. The rise time of less 250 ns and the total kicking angle of 20 mrad are required for the kickers that are grouped into two tanks. The design for the kicker magnets and the PFN is also given. To reduce the low beam loss in the extraction channels due to large halo emittance, large apertures are used for both the kickers and septum. Stray magnetic field inside and at the two ends of the circulating path of the Lambertson magnet and its effect to the beam has been studied.  
 
TUPLS122 Implementation of the Proposed Multiturn Extraction at the CERN Proton Synchrotron extraction, kicker, beam-losses, SPS 1789
 
  • M. Giovannozzi
    CERN, Geneva
  Following the positive results of the three-year measurement campaign at the CERN Proton Synchrotron concerning beam splitting with stable islands in the transverse phase space, the study of a possible implementation of the proposed multi-turn extraction was undertaken. The novel approach would allow a substantial reduction of beam losses, with respect to the present scheme, when delivering the high-intensity proton beams required for the planned CERN Neutrino to Gran Sasso Project. Major modifications to the ring layout are foreseen, such as a new design of the extraction bumps including also the installation of three additional kickers to create a closed-bump over the five turns used to extract the split beam. The ring aperture was reviewed and improvements are proposed to reduce possible beam losses between beam splitting and extraction. The goal consists of implementing the proposed changes by the end of the 2007/2008 PS shutdown and to commission the novel extraction during the 2008 physics run.  
 
WEPCH160 A Novel Proton and Light Ion Synchrotron for Particle Therapy synchrotron, extraction, dipole, injection 2305
 
  • S.P. Møller, F.S. Albrechtsen, T. Andersen, A. Elkjaer, N. Hauge, T. Holst, I. Jensen, S.M. Madsen
    Danfysik A/S, Jyllinge
  • K. Blasche, B. Franczak
    GSI, Darmstadt
  A compact and simple synchrotron for a cancer particle therapy system has been designed and is presently under construction. A lattice with six regular superperiods, twelve dipole and twelve quadrupole magnets, is used. The optimized lattice configuration, including the design of injection and extraction systems, provides large transverse phase space acceptance with minimum magnet apertures. The result is a synchrotron for PT with light magnets (5t dipoles), low values of peak power for pulsed operation and minimum dc power consumption. In addition, industrial production principles are used, keeping ease of construction, installation, and operation in mind. The beam, injected at 7 MeV/amu, can be accelerated to the maximum magnetic rigidity of 6.6 Tm in less than 1 s. A beam of 48-250 MeV protons and 88-430 MeV/u carbon ions can be slowly extracted during up to 10s. The intensity for protons and carbon ions will be well beyond the needs of scanning beam applications. The design and performance specifications of the synchrotron will be described in detail.  
 
WEPLS071 Design Method for a Large Aperture Opposite-field Septum Magnet injection, magnet-design, vacuum, proton 2544
 
  • K. Fan, Y. Arakaki, I. Sugai
    KEK, Ibaraki
  A novel design septum for Japan Proton Accelerator Research Center (J-PARC) delivers high intensity 3GeV proton beam to the 50GeV main ring is presented. The project requires the construction of the large aperture septum to accommodate the large size and high intensity injection beam. As there limitations due to the lattice size and restricted installation space, the septum must provide a large kick angle to the injection beam. Sufficient clearance between the circulating beam and the injection beam is also needed to reduce the beam loss to an acceptable level to avoid the serious radiation problem. To meet these challenging requirements, a large aperture, thin septum, opposite-field septum magnet has been developed. In this paper, we present the detail studies done for the optimization of the magnet, including DC and pulse magnet.  
 
WEPLS081 Modifications to the SPS LSS6 Septa for LHC and the SPS Septa Diluters extraction, LHC, SPS, proton 2565
 
  • J. Borburgh, B. Balhan, B. Goddard, Y. Kadi
    CERN, Geneva
  The Large Hadron Collider required the modification of the existing extraction channel in the long straight section (LSS) 6 of the CERN Super Proton Synchrotron (SPS), including the suppression of the electrostatic wire septa. The newly set up fast extraction will be used to transfer protons at 450 GeV/c as well as ions via the 2.9 km long transfer line TI 2 to Ring 1 of the LHC. The girder of the existing SPS DC septa was modified to accommodate a new septum protection element. Changes were also applied to the septum diluter in the fast extraction channel in SPS LSS4, leading to the other LHC ring and the CNGS facility. The requirements and the layout of the new LSS6 extraction channel will be described including a discussion of the design and performance of the installed septum diluters.  
 
WEPLS082 The Septa for LEIR Extraction and PS Injection vacuum, extraction, ion, injection 2568
 
  • J. Borburgh, M. Hourican, T. Masson, A. Prost
    CERN, Geneva
  The Low Energy Ion Ring (LEIR) is part of the CERN LHC injector chain for ions. The LEIR extraction uses a pulsed magnetic septum, clamped around a metallic vacuum chamber. Apart from separating the ultra high vacuum in the LEIR ring from the less good vacuum in the transfer line to the PS this chamber also serves as magnetic screen and retains the septum conductor in place. The PS ion injection septum consists of a pulsed laminated magnet under vacuum, featuring a single-turn water cooled coil and a remote positioning system. The design, the construction and the commissioning of both septa are described.  
 
WEPLS119 Power Converters for the ISIS Second Target Station Project (TS-2) controls, proton, pulsed-power, power-supply 2655
 
  • S.L. Birch, A. Morris, S.P. Stoneham
    CCLRC/RAL/ISIS, Chilton, Didcot, Oxon
  The Extract Proton Beamline to the ISIS second target station will require magnets to be powered by ac/dc power converters. A total of 50 magnets, quadrupole and dipole, require high stability dc current converters over a large dynamic range from several kW to 600kW. There is also a requirement for two 10Hz pulsed magnets to extract the proton beam from the present 50Hz target beamline, and hence specially designed power supplies are necessary. This paper describes the selection process, types of topology considerations and final selections.  
 
WEPLS136 Pulsed Magnet Power Supplies for Improved Beam Trajectory Stability at the APS booster, injection, power-supply, extraction 2697
 
  • B. Deriy, L. Emery, A.L. Hillman, G.S. Sprau, J. Wang
    ANL, Argonne, Illinois
  New power circuit and control electronics have been implemented in the septum power supplies at the Advanced Photon Source (APS). The goal was to meet a low pulse-to-pulse relative amplitude jitter of about ± 5·10-4 for trajectory stability in the booster-to-storage ring transport line. The original power supply design produced a jitter of ± 15e-4, which made injection tuning difficult. The jitter for the two new booster pulsed magnet supplies is now 1.1e-4, as inferred by a beam-based statistical analysis. A common design was made for all of the septum magnet power supplies at the APS. The system, regulation algorithms, the results achieved, and the current regulation stability issues will be discussed.  
 
THPCH144 The Upgrading of the TLS Injector Bumper and Septum Power Supplies for Top-up Operation power-supply, extraction, booster, controls 3128
 
  • C.-S. Fann, K.-T. Hsu, S.Y. Hsu, J.-Y. Hwang, K.-K. Lin, K.-B. Liu, Y.-C. Liu
    NSRRC, Hsinchu
  Due to the inevitable requirement of routine top-up mode operation at TLS (Taiwan Light Source), the reliability of all components in TLS injector has been reevaluated in the past several months. Among all possible subsystems to be reinforced, the bumper and septum power supplies revealed urgent need of upgrading while operated continuously in the user shifts. In this report, the modification of the charging mechanism of the pulsed power supplies is described. The modular feature of the newly built units provides fast replacement capability in case of components failure. The unified specifications for all components have greatly reduced the effort in preparing spare parts. The test results of these units are presented in this report.  
 
THPLS028 Pulsed Magnets and Pulser Units for the Booster and Storage Ring of the Diamond Light Source booster, storage-ring, kicker, injection 3341
 
  • V.C. Kempson, J.A. Dobbing
    Diamond, Oxfordshire
  • C.E. Hansen, N. Hauge, G. Hilleke
    Danfysik A/S, Jyllinge
  The Diamond booster and storage ring complex require ten pulsed magnet systems, five for the booster (injection and extraction) and five for the storage ring injection. Each has its own specific design criteria, although commonality of approach has been applied wherever possible. This paper describes the design principles and construction method for the various systems and presents the results of power supply tests and magnetic measurements. Finally, initial experience during the Diamond beam commissioning is discussed.  
 
THPLS101 Eddy Current Septum Magnets for Booster Injection and Extraction and Storage Ring Injection at Synchrotron SOLEIL injection, booster, vacuum, storage-ring 3511
 
  • P. Lebasque, J. Da Silva, P. Gros, J.-P. Lavieville, A. Mary, D. Muller
    SOLEIL, Gif-sur-Yvette
  Eddy current thin septum magnets are used to inject or extract the electron beam to/from the Booster and to the Storage Ring of SOLEIL. Good transverse homogeneity in the gap for injected beam, and low leakage field on circulating beam is needed, as well as pulse stability. The Top Up injection mode of the Storage Ring needs a very low level of leakage field on the stored beam path. Operating currents are from 2000 A and 3000 A for Booster injection and extraction, to 5100 A for SR injection. This contribution will describe the magnets and the pulsed power supplies design. The electrical and magnetic measurement results will be presented, with a specific emphasis on the improvements needed to reduce the level of leakage field of the SR septum magnet.  
 
THPLS110 Injection Scheme for TPS Storage Ring injection, storage-ring, kicker, lattice 3535
 
  • M.-H. Wang, H.-P. Chang, C.-C. Kuo, G.-H. Luo
    NSRRC, Hsinchu
  Taiwan Photon Source(TPS), a 3~3.3 GeV synchrotron light source with full energy injection is proposed to be built at NSRRC in Taiwan. In this paper we report the design of injection scheme for TPS. The space allocation of the injection components, the bumper design, the aperture consideration and the injection dynamics of injected and stored beam will all be discussed. The particle tracking of first few turns of injection is performed to evaluate the injection efficiency with the errors caused by the time jitter and amplitude stability of injection kickers. The issue of constant current operation will be also addressed.