Speaker
Description
It is inevitable to carry out beam diagnostics inside the superconducting cyclotron used for proton therapy at the application site. Radial probe plays an essential role in the field of beam diagnostics for SC cyclotrons. Years of efforts have been put forward by a group in the China Institute of Atomic Energy, focusing on advancing the beam diagnostics probe and readout electronics for the R-Probe system of the CYCIAE230 SC cyclotron. The EM interference inside the compact cyclotron poses a significant challenge for precise beam diagnostics. For example, when the R-Probe is moving along the radial path, the alternating high voltage from the RF system and the strong magnetic field generate greater noise than the signal itself. Care has been taken with the shielding and grounding design of the new radial probe used in the large radius. A replaceable scintillator-based probe head is also included for the beam diagnostics in the center region. The electronics design utilize a logarithmic amplifier, which yields a dynamic range of 140dBV, providing greater flexibility compared to the feedback IV ammeter. Fast ADC, as well as ZYNQ SOC, is used to reduce the noise to an acceptable level further. Besides, a magnetically friendly, lens group and a CMOS camera are developed and integrated for the scintillator-based probe head. The design of the new R-Probe for CYCIAE230 S.C. cyclotron will be reviewed in this paper, together with the preliminary test results.
Footnotes
*: Corresponding Author, Dr. Zhiguo Yin, Email: yinzhiguo@cnncmail.cn
