研究了能量在100到300 keV区间的低能宽幅电子束从真空引出到空气中的特性.利用EGS5程序模拟了电子束穿过不同厚度钛箔后,在空气中距离钛箔5～10 cm距离处的能量损失、束流损失和束流分布均匀性等.模拟结果显示,对于低能电子,钛箔厚度应该在10μm左右为宜,其透射率与能量直接相关,在距离钛箔5 cm的位置,电子束的分布不均匀度低于士2％,优于工业应用士10％的标准(特殊情况下要求为士5％),完全满足工业辐照要求.
In order to investigate the characteristics of extracting low-energy electron beam from vacuum into air,EGS5 is used to simulate the energy loss,beam loss and spatial distribution uniformity at the irradiation position,which is 5 ～ 10 cm to titanium foil with different thickness.The simulation results show that the transmittance is directly related to the incent energy of low-energy electron.When the titanium foil thickness is 10 μm,the inhomogeneity about the energy beam spatial distribution is below 5％ on the treatment plane 5 cm away from the titanium foil.And totally meet the industrial needs.
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