准确测量气态靶区的有效靶原子密度能够提升离子与气体和离子与等离子体靶相互作用实验结果的精度和对物理过程的认识.实验中利用离子加速器引出的100 ke V质子束穿过一定长度的氢气靶,对质子的剩余能量进行了精确测量,获得了在气体靶内的质子能损数据,结合已有的能损研究结果,重新标定了气体靶区内的有效靶原子密度.分别比较了能损、电离型真空计IonIVac ITR 90和薄膜电容型真空计Varian CDG-500的实验测量结果,对比了修正后的电离型真空计有效气压曲线,结果发现质子束能损的测量方式具有原位、高准确性、在线监测等突出优势,为诊断气态靶有效原子密度提供了新的方法.
【英文摘要】
The investigations of interaction processes between ion beams and gas and between ion beams and plasma play important roles in atomic physics, astrophysics, high energy density physics, and inertial confinement fusion. The atomic density of target is one of the key experimental parameters which may determine the interaction mechanism and experimental results. How to precisely diagnose the atomic density of target in different matter states, like gas phase and plasma phase, is challenging work on the experim...
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