Z箍缩软X射线辐射能量薄膜量热计改进技术

摘要

The resistive bolometer is an accurate,robust,spectrally broadband technique for measuring total soft X-ray yield.By replacing the pulsed voltage driver with a pulsed current driver and removing the series-wound resistance,the change of resistance between the ends of Ni-film can be measured directly,thus the measurement precision can be promoted effectively.The applicability of this improved resistive bolometer is expanded to all typical Z-pinch loads on "Qiangguang-Ⅰ " facility.Data analysis shows that the uncertainty decreases from 49.0％ to 19.6％ in measuring X-ray yield generated by A1 wire array Z-pinches.Xray yield data from the resistive bolometer were compared with the ones from the X-ray power measure system.The ratios between them were between 0.87 and 1.04.%薄膜量热计是进行Z箍缩辐射总能量测量的主要手段之一,准确可信的总能量参数对Z箍缩研究具有重要意义.对薄膜量热计装置进行技术改进,采用脉冲恒流源代替脉冲恒压源驱动镍薄膜量热计,撤除了回路中的串接电阻,可直接测量薄膜探测器的电阻变化,从而有效提高了辐射总能量测量的精度,拓宽了该设备的适用范围,使其可对目前“强光一号”加速器Z箍缩实验中所有典型负载进行测量.改进后平面型铝丝阵负载实验中总能量测量的相对不确定度由49.0％降低为19.6％.与闪烁探测系统功率测量结果积分值进行了对比,二者比值在0.87～1.04之间.