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TY - CONF AU - Muramatsu, M. AU - Inaniwa, T. AU - Iwata, Y. AU - Kitagawa, A. AU - Mizushima, K. AU - Ouchi, F. AU - Sasano, T. AU - Shiraishi, T. AU - Suzuki, T. AU - Takahashi, K. ED - Schaa, Volker RW ED - Pisciotta, Pietro TI - Production of Various Ion Species by Gas Pulsing Technique for Multi Ion Irradiation at NIRS-HEC Ion Source J2 - Proc. of ECRIS2018, Catania, Italy, 10-14 September 2018 C1 - Catania, Italy T2 - International Workshop on ECR Ion Sources T3 - 23 LA - english AB - High-energy carbon-ion radiotherapy is being carried out at Heavy Ion Medical Accelerator in Chiba (HIMAC). Over 11000 cancer patients have been treated with carbon beams having energies of between 56-430 MeV/u since 1994. At present, multi ion irradiation method by various ion species is being studied for optimization of LET and dose distribution. An ion source has to produce the helium, carbon, oxygen and neon at pulse by pulse for this method. Requirement currents for He²+, C²+, O³+ and Ne⁴+ are 500, 150, 230 and 300 eµA, respectively. We obtained beam current of 482, 151, and 270 eµA for He²⁺, C²⁺ and O³⁺ with mixed helium and CO² gases under the extraction voltage of 27 kV. Beam current of 27 and 15 eµA for C⁵+ and O⁷+ ions were also obtained in this time. He²⁺ beam include full striped ion such as C⁶+, N⁷+ and O⁸+. We have to increase the purity of He²+ beam. The gas feed system was modified for making pulsed gas by using a solenoid valve for switching different gas. Some experimental results of various ion productions will be described. PB - JACoW Publishing CP - Geneva, Switzerland SP - 79 EP - 81 KW - experiment KW - solenoid KW - ion-source KW - radiation KW - controls DA - 2019/01 PY - 2019 SN - 978-3-95450-196-0 DO - 10.18429/JACoW-ECRIS2018-TUP03 UR - http://jacow.org/ecris2018/papers/tup03.pdf ER -