“阳”加速器上喷气Z箍缩负载特性  

Experimental study on gas-puff Z-pinch load characteristics on Yang accelerator

作　　者：任晓东[1] 黄显宾[1] 杨礼兵[1] 但加坤 段书超[1] 张朝辉[1] 周少彤[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2010年第3期687-690,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10635050)

摘　　要：介绍了一种用于"阳"加速器的超音速单壳层喷气Z箍缩负载。利用快响应压力探针对喷气负载产生的超音速流场进行了测量,获得了流场中各个位置的冲击压力以及超音速喷嘴前端的驻室压力,结合流体力学公式,给出了流场中的压力和密度分布。气流的径向密度剖面显示,气体壳层的位置随轴向位置的变化而存在差异,并且随着到喷嘴距离的增加,轴心处的气流密度不断增加。对密度分布的径向积分结果表明,气流在靠近喷嘴处的线质量密度最大,距喷嘴越远,线质量密度越小。利用单壳层超音速喷气负载,在"阳"加速器上进行了喷气Z箍缩内爆实验,对内爆过程进行了初步分析,并利用雪耙模型计算了等离子体壳层的内爆轨迹,计算结果与实验测量较好地符合。A supersonic single-shell gas-puff load has been developed for Z-pinch experiments on ＂Yang＂ accelerator. Using a fast responding pressure probe to measure the supersonic gas flow, impact pressure at different position and plenum pressure were acquired, which were combined with gas dynamics formulas to determine gas pressures and densities. The radial density proflie displays that positions of gas shell varies with axial position, and the gas densities on axis increases as the distance from nozzle increases. Integral radial densities indicates that the linear mass density peaks at nozzle exit and decreases as increasing the distance from nozzle. Using single-shell supersonic gas-puff load, Z-pinch implosion experiments were performed on ＂Yang＂ accelerator. Primary analysis of implosion process was presented, and computational trajectories of imploding plasma shell using snowplow model are in agreement with the experimental results.

关 键 词：喷气Z箍缩 超音速喷嘴 压力传感器 内爆等离子体 

分 类 号：O532[理学—等离子体物理]