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TY - CONF AU - Guo, H.D. AU - Hu, Y.Y. AU - Li, X.Y. AU - Lin, Y.J. AU - Liu, X. AU - Tan, P. AU - Yu, Y. ED - Liu, Zhengzheng ED - Lidia, Steven ED - McCausey, Amy ED - Schaa, Volker RW TI - The Optimization Design and Output Characteristic Analysis of Ionization Chamber Dose Monitor in HUST-PTF J2 - Proc. of IBIC2017, Grand Rapids, MI, USA, 20-24 August 2017 C1 - Grand Rapids, MI, USA T2 - International Beam Instrumentation Conference T3 - 6 LA - english AB - An air parallel-plate ion chamber, which acts as a dose monitor for the beam delivery system in Huazhong University of Science and Technology Proton Therapy Facility(HUST-PTF), is designed as a redundant twin ionization chamber in order to meet the security requirements. In this paper, the characteristics of the designed ionization chamber are studied by using Boag theory and Monte Carlo simulation. Geant4 and SRIM are applied to simulate the energy loss and gain of 70-230MeV proton beam in parallel-plate ionization chamber. The influences of different sensitive regions and different gases on the performance of proton beam are discussed, moreover the structure of ionization chamber is optimized. According to the theory of Boag, the collection efficiencies of ionization chamber under different bias are calculated. The results show that the secondary particle collection efficiency of ionization chamber can reach above 99% when the air gap of ionization chamber is 5mm and bias voltage is above 100V. By the calculated gain of the ionization chamber, the output current of the detector can reach the order of 10nA when the proton beam intensity is 0.1nA. PB - JACoW CP - Geneva, Switzerland SP - 440 EP - 442 KW - ion KW - proton KW - electron KW - simulation KW - radiation DA - 2018/03 PY - 2018 SN - 978-3-95450-192-2 DO - 10.18429/JACoW-IBIC2017-WEPCF09 UR - http://jacow.org/ibic2017/papers/wepcf09.pdf ER -