激光加速电子束放射照相的模拟研究

摘要

Laser accelerated high-energy electron beam has the properties of small source size, quasi-monoenergetic, and short duration. In this paper the radiography by the electron beam is simulated using a Monte-Carlo code. Various radiographies are simulated, such as a step target and a thick iron block of inside cracks by a collimated 200-MeV beam, a modelled inertial-confinement-fusion target by a 11-MeV point-like beam, and the deflectometry of a 70-MeV electron beam by a laser plasma generated magnetic field. The obtained results indicate that the radiography by a laser-accelerated electron beam is of high spatial resolution and sensitivity in the detection of the inside defects of material, identification of the interface of thin material, and diagnosis of electromagnetic field.%激光加速产生高能量电子束具有源尺寸小、准单能、脉宽窄等特征．通过蒙特卡罗程序模拟研究了高能电子束的放射照相．模拟了200MeV准直电子束照射台阶靶、厚铁靶，11MeV点源电子束照射惯性约束聚变模型靶，以及70MeV点源电子束在激光等离子体磁场下的偏转．结果表明激光加速电子束在探伤厚材料内部、确认薄材料界面、测量电磁场等诊断中具有高时空分辨、灵敏等能力．