高能电子撞击不同靶所致辐射场的分析

Analysis of radiation fields induced by high energy electron bombardment of various targets

为了研究永磁体的辐射退磁效应,对高能电子撞击铜靶和钽靶的物理过程进行了理论分析。利用FLUKA程序对辐射退磁效应实验进行了Monte-Carlo模拟。模拟了靶内的电磁簇射过程和永磁体附近的辐射场,包括光子、中子、质子和电子等粒子的能谱以及各种靶的靶内和永磁体内的空间通量分布,还比较了永磁体中的吸收剂量率和中子注量率。计算结果为永磁体的辐射退磁效应的分析提供了有用的数据。

The radiation-induced demagnetization of permanent magnets was studied by theoretically analyzing the physical processes when high-energy electrons hit copper and tantalum targets. Monte-Carlo simulations using FLUKA were also used to model the radiation-induced demagnetization experiments. The simulations predict the electromagnetic shower on the target and the radiation field near the permanent magnet, including the various particle spectra, including photon, neutron, proton, and electron particles, and the spatial distribution of the flux in the target and at the permanent magnet for the various targets. The absorbed dose rate and neutron fluence in the permanent magnet were also compared. The computed results provide useful data for the analysis of radiatlon-lnduced demagnetization of permanent magnets.