Phys. Rev. ST Accel. Beams 14, 071301 (2011)

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KEK digital accelerator

T. Iwashita, T. Adachi, K. Takayama, K. W. Leo, T. Arai, Y. Arakida, M. Hashimoto, E. Kadokura, M. Kawai, T. Kawakubo, Tomio Kubo, K. Koyama, H. Nakanishi, K. Okazaki, K. Okamura, H. Someya, A. Takagi, A. Tokuchi, and M. Wake

Phys. Rev. ST Accel. Beams 14, 071301 – Published 20 July 2011

Abstract

The High Energy Accelerator Research Organization KEK digital accelerator (KEK-DA) is a renovation of the KEK 500 MeV booster proton synchrotron, which was shut down in 2006. The existing 40 MeV drift tube linac and rf cavities have been replaced by an electron cyclotron resonance (ECR) ion source embedded in a 200 kV high-voltage terminal and induction acceleration cells, respectively. A DA is, in principle, capable of accelerating any species of ion in all possible charge states. The KEK-DA is characterized by specific accelerator components such as a permanent magnet X-band ECR ion source, a low-energy transport line, an electrostatic injection kicker, an extraction septum magnet operated in air, combined-function main magnets, and an induction acceleration system. The induction acceleration method, integrating modern pulse power technology and state-of-art digital control, is crucial for the rapid-cycle KEK-DA. The key issues of beam dynamics associated with low-energy injection of heavy ions are beam loss caused by electron capture and stripping as results of the interaction with residual gas molecules and the closed orbit distortion resulting from relatively high remanent fields in the bending magnets. Attractive applications of this accelerator in materials and biological sciences are discussed.

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Received 5 December 2010

DOI:https://doi.org/10.1103/PhysRevSTAB.14.071301

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Authors & Affiliations

T. Iwashita¹, T. Adachi^1,2, K. Takayama^1,2,3, K. W. Leo², T. Arai¹, Y. Arakida^1,2, M. Hashimoto¹, E. Kadokura¹, M. Kawai¹, T. Kawakubo¹, Tomio Kubo¹, K. Koyama¹, H. Nakanishi¹, K. Okazaki⁴, K. Okamura^1,2, H. Someya¹, A. Takagi^1,2, A. Tokuchi⁵, and M. Wake^1,2

¹High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
²The Graduate University for Advanced Studies, Hayama, Miura, Kanagawa 240-0193, Japan
³Tokyo Institute of Technology, Nagatsuda, Kanagawa 152-8550, Japan
⁴Nippon Advanced Technology Co., Ltd., Tokaimura, Naka, Ibaraki 319-1112, Japan
⁵Pulse Power Laboratory, Kusatsu, Shiga 520-0806, Japan

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Vol. 14, Iss. 7 — July 2011

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Physical Review Accelerators and Beams

KEK digital accelerator

T. Iwashita, T. Adachi, K. Takayama, K. W. Leo, T. Arai, Y. Arakida, M. Hashimoto, E. Kadokura, M. Kawai, T. Kawakubo, Tomio Kubo, K. Koyama, H. Nakanishi, K. Okazaki, K. Okamura, H. Someya, A. Takagi, A. Tokuchi, and M. Wake

Phys. Rev. ST Accel. Beams 14, 071301 – Published 20 July 2011

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