Speaker
Description
The study of radiation effects and radiation-hardening technology has become increasingly demanding for modern proton cyclotrons in the middle energy range. To meet this requirement, the China Institute of Atomic Energy (CIAE) has designed and constructed a dedicated irradiation terminal downstream of the beamline, following the telescope section, for the CYCIAE-230 superconducting cyclotron complex. The irradiation station uses the double scattering technique to generate a uniformly distributed dose field. The setup incorporates a primary scattering target made of Lexan material and a secondary scattering target composed of lead/Lexan material, functioning as a double scattering beam expansion and uniformization device to form a 3cm × 3cm irradiation field. The Siebers profile is adopted for the secondary scatter. Energy calibration has been studied, yielding a beam energy of 223 MeV at the terminal position when the first scatter is set to a minimal length. The proton particle distribution reveals a dose distribution uniformity of better than 85%. The fluence of the desired field with a measured fluence in the range of 1 × 108 P × sec-1 × cm-2 to 5 × 1011 P × sec-1 × cm-2. The typical irradiation period is adjusted to be in the range of 10 to 1000 seconds, accordingly to facilitate beam gating. The design, geometry, and test results of the beamline and irradiation terminal will be reported in this paper, along with the calibration and online beam diagnostics results.
Footnotes
Corresponding author Dr. Zhiguo Yin, email: zhiguoyin@cnncmail.cn
