摘要
The SC200 proton therapy superconducting cyclotron was developed by ASIPP (Hefei, China) and JINR (Dubna, Russia). A measurement system was designed to assess the average radial component of the magnetic field (Brav) with 15 search coils in the median plane. The winding differences of the search coils affect the measurement accuracy of the Brav. Based on the electromagnetic induction principle, to measure the Brav accurately, this paper focuses on the design and commissioning of the Brav measurement system. The preliminary results confirm that the system design is reasonable and suitable. After testing the search coil at different speeds, the optimal speed was determined as 2.5 mm/s. The relative error was approximately 0.1% under the maximum radial component of the magnetic field Br of 7 G. The measurement precision was up to 1.0×10^-3, which can provide the required measurement tolerance of 3–7 G for Br in the median plane. The commissioning of the Brav measurement system is an important step for Br measurement. It can check and adjust the asymmetry of the superconducting coils (SCs).
The SC200 proton therapy superconducting cyclotron was developed by ASIPP（Hefei, China） and JINR（Dubna, Russia）. A measurement system was designed to assess the average radial component of the magnetic field(Brav) with 15 search coils in the median plane. The winding differences of the search coils affect the measurement accuracy of the Brav. Based on the electromagnetic induction principle, to measure the Brav accurately, this paper focuses on the design and commissioning of the Brav measurement system. The preliminary results confirm that the system design is reasonable and suitable.After testing the search coil at different speeds, the optimal speed was determined as 2.5 mm/s. The relative error was approximately 0.1% under the maximum radial component of the magnetic field Brof 7 G. The measurement precision was up to 1.0 × 10-3, which can provide the required measurement tolerance of 3–7 G for Brin the median plane. The commissioning of the Brav measurement system is an important step for Brmeasurement. It can check and adjust the asymmetry of the superconducting coils（SCs）.
基金
supported by the Natural Science Foundation of Anhui under Grant(No.1908085QA25)
the Research Initiation Foundation of Anhui Polytechnic University(No.2018YQQ001)
the PreResearch National Natural Science Foundation of China of Anhui Polytechnic University(No.2019yyzr13)
the National Natural Science Foundation of China(Nos.11575237 and 11775258)
the National Magnetic Confinement Fusion Science Program(No.2015GB101001)
the International Scientific and Technological Cooperation Project of Anhui(No.1704e1002207)
