Speaker
Description
A 240 MeV microampere-level extracted beam is now available from the superconducting cyclotron CYCIAE230, which was designed by the China Institute of Atomic Energy (CIAE). To stabilize the beam current of the cyclotron, a non-intercept high-dose-rate ionization chamber (IC) system is designed and tested at the cyclotron exit, providing real-time proton beam current measurements for feedback control. The same design is used for the irradiation station downstream of the beamline, for proton FLASH studies, and the radioactive-effect studies of integrated circuits in aerospace applications. A laser-etched, ultra-thin, gold-plated PI film is selected for both the integral plane and the multi-strip cathode in this design to increase the IC's lifetime, aided by a dry nitrogen gas system. Environmental compensation circuits, integral circuits, and front-end 128-channel ADCs are integrated into the IC to improve the system's signal-to-noise ratio and accuracy. The multichannel charge readouts are acquired via an ultra-thin multichannel coaxial cable that provides high-speed digital communication between the ADCs and the readout SOCs. A bare-metal C++ program is developed to run on a ZYNQ processor and provide real-time current and charge readings. The IC and its readout electronics have been integrated and tested with a proton beamline of the CYCIAE230 cyclotron. The preliminary test results show that high accuracy and repeatability can be achieved after calibration using the Faraday cup downstream. The design of the IC, the integrated circuits, the readout electronics, and the software will be reported in this paper, along with preliminary test results from high-dose-rate measurements.
| Minioral | Yes |
|---|---|
| IEEE Member | No |
| Are you a student? | Yes |