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Arakida, Y.

Paper Title Page
MOPAN042 Switching Power Supply for Induction Accelerators 251
 
  • M. Wake, Y. Arakida, K. Koseki, Y. Shimosaki, K. Takayama, K. T. Torikai
    KEK, Ibaraki
  • W. Jiang, K. Nakahiro
    Nagaoka University of Technology, Nagaoka, Niigata
  • A. Sugiyama
    Shindengen Co., Ltd., Tokyo
  • A. Tokuchi
    Nichicon (Kusatsu) Corporation, Shiga
 
  A new particle acceleration method using pulsed induction cavities was introduced in the super-bunch project at KEK. Unlike conventional RF acceleration, this acceleration method separates functions of acceleration and confinement As a result, this acceleration method can be applied for accelerating a wide mass range of particles. However, it is necessary to give a very fast pulsed-excitation to the cavity to perform the induction acceleration. Switching power supplies of high voltage output with very fast pulse-operation is one of the most important key technologies for this new acceleration method. We have developed 20ns rise time pulse at continuous repetition rate of 1MHz using MOS-FET's. Induction cavities were modulated through the 200m long transmission lines. Further development using SI- thyristor achieved 1MHz and 2kV switching in a burst mode operation. SiC devices are also studied for the application and some promising results were obtained. Faster operation will make this new acceleration technology available for small accelerator projects.  
TUPAN044 Acceleration Scheme in the AIA and its Control System 1484
 
  • T. Iwashita, Y. Arakida, T. Kono, Y. Shimosaki, K. Takayama
    KEK, Ibaraki
  • T. S. Dixit
    GUAS/AS, Ibaraki
  • K. Okazaki
    Nippon Advanced Technology Co. Ltd., Ibaraki-prefecture
 
  An All Ion Accelerator (AIA), an injector-free induction synchrotron (IS) is proposed as a modification of the KEK booster*. The Booster is a rapid cycle synchrotron operating at a repetition rate of 20Hz. The AIA based on the booster requires more flexible trigger generation for the acceleration or confinement system than the one used for the IS POP experiment**. Assuming Ar+18 injection from a 200 kV ion source, the revolution period changes from 9.08usec to 333nsec at the end, and the required acceleration voltage changes from few tens of volts to 6.4kV at the middle of acceleration. Since a number of available acceleration cells is finite and their maximum pulse width and output voltage are limited to 500 nsec and 2 kV/cell, respectively, the dynamic allocation of acceleration cells in real time is indispensable, where a trade-off between the voltage amplitude and integrated pulse-length is realized. The acceleration scheme employing fast DSPs and a trigger control system is designed so as to meet the above requirement. Its whole story will be presented, including beam simulation results in the proposed AIA.

* E. Nakamura et al., in PAC07** K. Takayama et al., "Experimental Demonstration of the Induction Synchrotron" appeared in Phys. Rev. Lett. soon and in PAC07

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

* K. Takayama, et al., "Experimental Demonstration of the Induction Synchrotron", PAC07.** K. Takayama, et al., PCT/JP2006/308502 (2006).*** T. Dixit, et al., PAC07.

 
TUPAN050 Status of the Induction Acceleration System 1502
 
  • Y. Shimosaki, Y. Arakida, T. Iwashita, T. Kono, E. Nakamura, K. Takayama, M. Wake
    KEK, Ibaraki
  • T. S. Dixit
    GUAS/AS, Ibaraki
  • N. Nagura, K. Okazaki, K. Otsuka
    Nippon Advanced Technology Co. Ltd., Ibaraki-prefecture
  • K. T. Torikai
    NIRS, Chiba-shi
 
  Single proton bunch confined by the barrier voltage was accelerated by the induction step-voltage from 500 MeV to 6 GeV at the KEK-PS on March 2006*. We will present the status with the information about troubles and counter-measures for the induction acceleration system.

* K. Takayama, presented in PAC07.