聚龙一号装置应用于材料超高压物性实验波形调节技术

来源 :第六届全国高能量密度物理会议 | 被引量 : 0次 | 上传用户:billcde
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  磁驱动准等熵加载作为介于准静态和冲击加载的材料动力学特性研究的新型实验技术,熵增小、温度低.其压力加载路径主要由电流波形决定,我们可以通过调节电流波形控制样品加载路径.这些实验技术最先于1999年在美国圣地亚国家实验室的Z装置上开展,结合脉冲调节技术,已成功测量到钽440 GPa压力的off-Hugoniot状态方程数据.聚龙一号装置是中国的一个太瓦级脉冲功率装置,包括24个支路平行分布在两层,每个模块包含6MV的Marx发生器、中间储能器、5-MV触发激光开关、脉冲形成线、水介质自击穿开关和三纤板传输线等.所有24路由12路激光分别触发,每路激光触发2个开关.ICE负载被应用于全电路模拟程序,得到的负载电流和实验结果在上升沿吻合非常好.结合负载电流设计技术,更厚的样品被准等熵压缩到兆巴压力,同时发射铝飞片达到21 km/s.实验结果验证了聚龙一号装置的波形调节技术提升,将有更多的材料物性实验会在这个平台上开展.
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  近期在神光Ⅱ高功率激光装置上开展了一系列动压缩材料物性研究实验。采用激光直接驱动二级飞片进行了金属材料高压状态方程绝对测量探索,获得了铝材料50 GPa到200 GPa的