Real-time beam intensity measurement system for extraction section of cyclotron in Heavy Ion Medical Machine

You Yaoyao; Li Min; Mao Ruishi; Li Weilong; Feng Yongchun; Zhao Tiecheng; Yang Yaoxiong; Wang Wentao

doi:10.11884/HPLPB202234.220064

Volume 34 Issue 11

Sep. 2022

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You Yaoyao, Li Min, Mao Ruishi, et al. Real-time beam intensity measurement system for extraction section of cyclotron in Heavy Ion Medical Machine[J]. High Power Laser and Particle Beams, 2022, 34: 114001. doi: 10.11884/HPLPB202234.220064

Citation:

You Yaoyao, Li Min, Mao Ruishi, et al. Real-time beam intensity measurement system for extraction section of cyclotron in Heavy Ion Medical Machine[J]. High Power Laser and Particle Beams, 2022, 34: 114001. doi: 10.11884/HPLPB202234.220064

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Real-time beam intensity measurement system for extraction section of cyclotron in Heavy Ion Medical Machine

doi: 10.11884/HPLPB202234.220064

You Yaoyao^{1, 2
,},
Li Min^{1, 2
,
,},
Mao Ruishi^{1, 2},
Li Weilong¹,
Feng Yongchun¹,
Zhao Tiecheng¹,
Yang Yaoxiong¹,
Wang Wentao¹

1.
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2022-03-09
Rev Recd Date: 2022-08-23

Available Online: 2022-08-30

Publish Date: 2022-09-20

Abstract

Abstract

To meet the beam intensity measurement requirements at the extraction section of the cyclotron in Heavy Ion Medical Machine (HIMM), the integral current transformer (ICT) and lock-in amplifier scheme was adopted to implement non-destructive and real-time beam intensity measurement on the medium energy beam transport line (MEBT). ICT acquires the relative beam intensity which can’t be monitored directly, as a result, the Faraday cup which is a kind of destructive detector was used to achieve calibration of ICT with beam. In this paper, the requirements and design scheme of beam intensity measurement at MEBT are firstly analyzed, and based on the design scheme, tests with this beam intensity measurement system are carried out in the laboratory and with beam. According to the test results, the beam intensity stability is about 90 nA, while the corresponding relative error is about 8%. Furthermore, the response time of ICT and Faraday cup system is less than 1 ms and 100 ms respectively, which meet the physical measurement requirements. Further study on the relationship between frequency-variation of cyclotron radio-frequency system and beam current measured by ICT will be carried on in the next step.
- Heavy Ion Medical Machine,
- beam intensity measurement,
- integral current transformer,
- lock-in amplifier,
- response time

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References(17)

References

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