Train probe for beam diagnostics of the SC200 superconducting cyclotron
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Train probe for beam diagnostics of the SC200 superconducting cyclotron Le-Xing Hu1,2 Kai Yao3
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Kai-Zhong Ding1 • Yun-Tao Song1 • Yu-Cheng Wu3
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Received: 10 June 2020 / Revised: 7 September 2020 / Accepted: 9 September 2020 / Published online: 12 October 2020 Ó China Science Publishing & Media Ltd. (Science Press), Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Chinese Nuclear Society and Springer Nature Singapore Pte Ltd. 2020
Abstract The SC200 proton therapy system commissioned by the Hefei CAS Ion Medical and Technical Devices Co., Ltd. (HFCIM; Hefei, China) and the Joint Institute for Nuclear Research (JINR; Dubna, Russia) has made significant progress. A main radial beam diagnostic system (MRBDS) equipped with a new type of train probe was developed to satisfy the requirements of beam diagnosis. In this paper, the detailed design of the mechanical structure and electronics system of the MRBDS is presented. The electronics system, which includes hardware and software components, was tested and calibrated. The results show that measurement errors can be significantly reduced by the designed calibration procedures. The repeatability of the mechanical structure was also verified, and the experimental results indicate that the unidirectional repeatability of the positioning is better than 0.3 mm. Finally, the MRBDS was used to measure the phase lag of the particles in the beam, and the results showed a high degree of agreement with theoretical calculations, which proved the applicability and high efficiency of the MRBDS.
This work was supported by the funding of the CN-RU cooperation cyclotron design (No. 1604b0602005). & Kai-Zhong Ding [email protected] 1
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
2
University of Science and Technology of China, Hefei 230026, China
3
Hefei CAS Ion Medical and Technical Devices Co., Ltd, Hefei 230088, China
Keywords Train probe Beam diagnostic Cyclotron Measurement and calibration Commissioning
1 Introduction Malignant tumors are one of the major diseases threatening human health and life [1–3]. Proton therapy has become an important and widely employed cancer treatment technology owing to its remarkable efficiency and minor side effects. The SC200 superconducting cyclotron, installed at the Hefei CAS Ion Medical and Technical Devices Co., Ltd. (HFCIM), can provide proton acceleration up to 200 MeV with a maximum beam current of * 1 lA [4–7]. It is designed for tumor therapy with adjustable beam intensity, strong magnetic field, and high radio frequency (RF) interference. As an important part of the accelerator, the beam diagnostic system can provide critical information for beam diagnosis, which is crucial in beam tuning, key parameter optimization, and operation monitoring [8, 9]. The radial probe is the main diagnostic instrument for beam tuning and beam commissioning inside the cyclotron [10–12]. Roy et al. [13] developed a radial probe by chaining several carts end-to-end using hinged joints, wh
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