Mathematic Model of Neutron Dose Rates in the EAST Hall

摘要

Radiation particles and rays will be produced during each nuclear fusion plasma discharge, especially neutrons which will be largely emitted out with high intensity and energy under the neutral beam injection (NBI) discharge mode. To well obtain the neutron dose rates during the nuclear fusion plasma discharge, He-3-based neutron detector is adopted in this paper, and to fully obtain the neutron dose rates in the Experimental Advanced Superconducting Tokamak (EAST) hall, three neutron detectors have been set at three selected monitoring sites with a long distance to the monitoring personal computer (PC), and the monitoring system, based on the RS-485 differential communication mode, was designed and setup. Along with each nuclear fusion plasma discharge, the neutron radiation field should appear as a pulsed radiation field. Based on the neutron dose rates, saved by the monitoring system, the neutron radiation dose rates were studied during one NBI-based nuclear fusion plasma discharge. Finally, the Gaussian function model of neutron dose rates during one nuclear fusion plasma discharge was obtained and presented.