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Description
A superconducting cyclotron-based proton therapy system has been developed at the Chengdu Cyclotron Science and Technology Co., Ltd. (CCST). For a cyclotron-based proton therapy system, the ion chamber at the nozzle is crucial for both the therapy system and the adaptation of the planning system. In practice, to achieve low noise measurement, the existing system is equipped with 256 triaxial cables from the ion chambers to the readout electronics, which brings an extremely high cost and is space-consuming. Distributed multi-channel readout electronics are designed and partially integrated into the ion chamber of the nozzle, thereby increasing the signal-to-noise ratio in detecting the scanning beam spot position. For this purpose, multiple 128-channel Current-to-Digital ADCs are integrated into the ion chamber to digitize the charge and enhance electronic electromagnetic compatibility. The digital readout electronics are based on the ZYNQ 7020 and transmit data via the AXI GPIO bus and the UDP protocol, which meet real-time requirements. Besides that, a low-overhead beam center localization algorithm is designed, which is suitable for embedded electronics. This paper reviews the design of the multichannel readout electronics for compact ion chambers, along with preliminary test results.
Footnotes
*: Corresponding Author, Dr. Zhiguo Yin, Email: yinzhiguo@cnncmail.cn
