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Title: Operation status of the electron cyclotron resonance ion source at Gunma University

An ECR ion source of Gunma University Heavy Ion Medical Center, so-called KeiGM [M. Muramatsu, A. Kitagawa, Y. Sakamoto, S. Sato, Y. Sato, H. Ogawa, S. Yamada, H. Ogawa, Y. Yoshida, and A. G. Drentje, Rev. Sci. Instrum. 76, 113304 (2005)], has been operated for cancer therapy and physical/biological experiment since 2010. KeiGM produces typically 230 μA of 10 keV/u C{sup 4+} ions from CH{sub 4} gases. The vacuum pressure is kept between 1.2 × 10{sup −4} and 1.7 × 10{sup −4} Pa so as to suppress the pulse-to-pulse current fluctuation within ±10%. The extraction electrode is cleaned every 6–8 months in order to remove deposited carbon, which increases the leak current and discharge. In order to investigate the possibility of long-term operation without such maintenances, oxygen aging for the cleaning of the extraction electrode has been tested in the test bench. The same-designed ion sources at National Institute of Radiological Sciences and SAGA Heavy Ion Medical Accelerator in Tosu (SAGA-HIMAT) are also operated with stable C{sup 4+} current, which are suitable for the continuous operation for cancer therapy.
Authors:
; ;  [1] ;  [2] ; ;  [3] ;  [4] ; ;  [5]
  1. Gunma University Heavy Ion Medical Center, Maebashi, Gunma 371-0044 (Japan)
  2. Kanagawa Cancer Center, Yokohama 241-8515 (Japan)
  3. National Institute of Radiological Sciences, Chiba 263-8555 (Japan)
  4. SAGA Heavy Ion Medical Accelerator in Tosu, Tosu, Saga 841-0071 (Japan)
  5. Accelerator Engineering Corporation, Chiba 263-0043 (Japan)
Publication Date:
OSTI Identifier:
22253825
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 60 APPLIED LIFE SCIENCES; ACCELERATORS; CARBON IONS; ECR ION SOURCES; ELECTRODES; HEAVY IONS; MEDICAL ESTABLISHMENTS; METHANE; NEOPLASMS; RADIOTHERAPY