Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (2): 23 doi: 10.1007/s41365-019-0545-y

• ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Beam position monitors as precise phase pickups for beam energy measurement at the Compact Pulsed Hadron Source

Min-Wen Wang1,2,3,4 • Qing-Zi Xing1,2,3 • Shu-Xin Zheng1,2,3 • Zhong-Ming Wang4 • Meng-Tong Qiu4 • Xia-Ling Guan1,2,3 • Xue-Wu Wang1,2,3 • Wen-Hui Huang1,2,3   

  1. 1 Laboratory of Particle and Radiation Imaging, Ministry of Education, Tsinghua University, Beijing 100084, China
    2 Laboratory for Advanced Radiation Sources and Application, Tsinghua University, Beijing 100084, China
    3 Department of Engineering Physics, Tsinghua University, Beijing 100084, China
    4 State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi’an 710024, China
  • Received:2018-05-30 Revised:2018-08-22 Accepted:2018-08-24
  • Contact: Shu-Xin Zheng E-mail:zhengsx@tsinghua.edu.cn
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Min-Wen Wang, Qing-Zi Xing, Shu-Xin Zheng, Zhong-Ming Wang, Meng-Tong Qiu, Xia-Ling Guan, Xue-Wu Wang, Wen-Hui Huang. Beam position monitors as precise phase pickups for beam energy measurement at the Compact Pulsed Hadron Source.Nuclear Science and Techniques, 2019, 30(2): 23     doi: 10.1007/s41365-019-0545-y
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Abstract: The 13-MeV proton linac of the Compact Pulsed Hadron Source (CPHS) at Tsinghua University, China, is composed of a 50-keV electron cyclotron resonance proton source, a 3-MeV four-vane-type radio-frequency quadrupole (RFQ) accelerator, and a drift tube linac (DTL). Precise measurement of the beam energies at the exit of the RFQ and the DTL is critical for DTL commissioning. Two button-type beam position monitors (BPMs) installed downstream of the RFQ are used to perform the measurement using a time-of-flight method. The effects of several factors on phase measurement accuracy are analyzed. The phase measurement accuracy of the BPMs at CPHS is better than 1:03 at 325 MHz after corrections, corresponding to an energy measurement error of ± 0.07%. The beam energy measured at the exit of the RFQ is 2:994  0:0022 MeV, which is consistent with the design value.

Key words: Beam energy, Time of flight, Beam position monitor, Phase pickup