Operation status of the electron cyclotron resonance ion source at Gunma University
- Gunma University Heavy Ion Medical Center, Maebashi, Gunma 371-0044 (Japan)
- Kanagawa Cancer Center, Yokohama 241-8515 (Japan)
- National Institute of Radiological Sciences, Chiba 263-8555 (Japan)
- SAGA Heavy Ion Medical Accelerator in Tosu, Tosu, Saga 841-0071 (Japan)
- Accelerator Engineering Corporation, Chiba 263-0043 (Japan)
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.
- OSTI ID:
- 22253825
- Journal Information:
- Review of Scientific Instruments, Vol. 85, 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); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development of Compact Electron Cyclotron Resonance Ion Source with Permanent Magnets for High-Energy Carbon-Ion Therapy
The compact electron cyclotron resonance ion source KeiGM for the carbon ion therapy facility at Gunma University