Simulation Study Of A Neutron Beam Monitor Based On Boron-coated GEM

Neutron is used to investigate the structure and dynamics of material because of its special nature, which have magnetic but haven't charge. The developments of neutron scattering techniques rely on a high flux neutron source, but this source's beam intensity is changing at any time due to many factors, that will affect the experimental results. If there is a neutron beam monitor which has a higher count rate to monitor the neutron beam intensity at real time, such systematic errors can be eliminated, but the traditional beam monitor isn't suitable for the requirements of the high count rate. The GEM (Gas Electron Multiplier) detector with high count rate (1MHz) and good position resolution becomes a generation beam monitor candidate which is developed in recent years.In order to develop the GEM monitor that is based on boron-coated, using the M.C. theory to research the physical process of neutron response. According to the neutron beam monitor requirements, such as low neutron conversion rate, high gain, high count rate and good position resolution etc, to simulate the relationship between the thickness of 10B and neutron conversion rate, the electric field of drift region, transfer region and induction region impact on the monitor gain and the signal of neutron. Proved the GEM monitor's digital readout by 5mm*5mm pad is feasibly with the simulation theory.This thesis is mainly to research the GEM monitor with boron-coated inside physical processes for neutron detection, to provide reference date for the beam monitor's experimental results, the simulation results are very important in the process of the development of this neutron beam monitor.