【摘 要】
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北京大学超小型激光离子加速器(CLAPA)于2016年7月开始运行.该系统包括200 TW飞秒激光器,加速真空腔体,离子传输线和辐照终端.目前,CLAPA第一阶段离子加速实验已经顺利完
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北京大学超小型激光离子加速器(CLAPA)于2016年7月开始运行.该系统包括200 TW飞秒激光器,加速真空腔体,离子传输线和辐照终端.目前,CLAPA第一阶段离子加速实验已经顺利完成.实验中的靶体为微米厚度的金属靶体和纳米厚度类金刚石自支撑碳膜(DLC).我们对激光参数(能量、聚焦强度、脉宽等)和靶体参数(密度,厚度等)进行了详细的扫描和优化；在40 TW激光功率下,得到了截止能量在5 MeV以上的稳定质子束；并同时运行多种诊断手段,对离子加速过程中激光参数和等离子体密度时空演化进行了探测,以深入理解激光加速物理过程.在后续的实验中,激光器将进行满功率运行,聚焦峰值功率将会达到1020 W/cm2.计划2017年,CLAPA将加速产生能量5～15 MeV可调的,稳定高品质质子束.我们将同时开展激光加速离子束在癌症治疗,质子成像,快点火,磁约束聚变和空间辐射模拟等方面的应用实验.
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