IBIC2017 - List of Authors (Liu, X.)

Paper	Title	Page
WEPCF09	The Optimization Design and Output Characteristic Analysis of Ionization Chamber Dose Monitor in HUST-PTF	440
	H.D. Guo, Y.Y. Hu, X.Y. Li, Y.J. Lin, P. Tan, Y. Yu HUST, Wuhan, People's Republic of China X. Liu Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
	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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-WEPCF09
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MOPCF03	Preliminary Design of Beam Diagnostic System in the HUST-PTF Beamline	81
	X. Liu, Q.S. Chen, B. Qin, K. Tang HUST, Wuhan, People's Republic of China W. Chen Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
	Funding: Work supported by The National Key Research and Development Program of China, with grant No. 2016YFC0105305, and by National Natural Science Foundation of China (11375068). Proton therapy is now recognized as one of the most effective radiation therapy methods for cancers. A proton therapy facility with multiple gantry treatment rooms is under development in HUST (Huazhong University of Science and Technology), which is based on isochronous superconducting cyclotron scheme. The 250MeV/500nA proton beam will be extracted from a superconducting cyclotron and injected into the beam-line. Many beam diagnostic instruments are distributed throughout the beam line to measure the beam profile, position, current, loss, energy and energy spread. Some of them will send the beam information to the treatment control system (TCS) and serve as the safety interlock. This paper presents the considerations for the distribution of beam diagnostic instruments and shows the layout of beam diagnostics monitors in the beamline.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-MOPCF03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

The Optimization Design and Output Characteristic Analysis of Ionization Chamber Dose Monitor in HUST-PTF

440

H.D. Guo, Y.Y. Hu, X.Y. Li, Y.J. Lin, P. Tan, Y. Yu
HUST, Wuhan, People's Republic of China
X. Liu
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China

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.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-WEPCF09

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPCF03

Preliminary Design of Beam Diagnostic System in the HUST-PTF Beamline

81

X. Liu, Q.S. Chen, B. Qin, K. Tang
HUST, Wuhan, People's Republic of China
W. Chen
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China

Funding: Work supported by The National Key Research and Development Program of China, with grant No. 2016YFC0105305, and by National Natural Science Foundation of China (11375068).
Proton therapy is now recognized as one of the most effective radiation therapy methods for cancers. A proton therapy facility with multiple gantry treatment rooms is under development in HUST (Huazhong University of Science and Technology), which is based on isochronous superconducting cyclotron scheme. The 250MeV/500nA proton beam will be extracted from a superconducting cyclotron and injected into the beam-line. Many beam diagnostic instruments are distributed throughout the beam line to measure the beam profile, position, current, loss, energy and energy spread. Some of them will send the beam information to the treatment control system (TCS) and serve as the safety interlock. This paper presents the considerations for the distribution of beam diagnostic instruments and shows the layout of beam diagnostics monitors in the beamline.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-MOPCF03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)