反场构型等离子体靶压缩过程中强磁场对α粒子能量的约束效应  

Compressed strong magnetic field confinement effect on alpha particle energy in field-reversed configuration plasma target

作　　者：赵小明[1] 孙承纬[1] 孙奇志[1] 贾月松[1] 秦卫东[1] Zhao Xiaoming;Sun Chengwei;Sun Qizhi;Jia Yuesong;Qin Weidong(Institute of Fluid Physics,CAEP,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院流体物理研究所

出　　处：《强激光与粒子束》2019年第12期70-77,共8页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11605183,11605182);中国工程物理研究院流体物理研究所规划发展项目(TCGH0119)

摘　　要：基于一维弹塑性磁流体力学程序(SSS-MHD),研究了反场构型(FRC)等离子体靶在磁驱动固体套筒压缩过程中强磁场对α粒子能量约束效应,分析了α粒子的非局域和局域自加热对FRC等离子靶压缩峰值温度的影响,以及α粒子能量在整个压缩过程中端部损失效应。等离子体部分采用多温单流体的模型,能量的计算中引入了DT离子、电子及α粒子多成分温度的能量方程,同时考虑了等离子体压缩过程热平衡下的核反应和非局域自加热问题。研究结果表明,磁化靶聚变等离子体在压缩过程中具有较好的稳定性,能够保持刚性转子的靶结构,压缩过程形成的强磁场能够将α粒子的能量约束在O点附近的区域,有利于等离子体靶的点火及燃烧;α粒子对等离子体的自加热效应主要集中在等离子体电流中心区,而非等离子体中心轴处;α粒子对DT等离子体局域和非局域自加热过程存在差异,局域自加热过程的功率大于非局域自加热过程的功率,FRC等离子靶压缩峰值状态温度相差0.5倍。在反场构型的刮离层区,α粒子的能量端部损失在FRC等离子体靶的压缩和膨胀过程中逐渐增大。Based on an one dimensional elastic-plastic reactive hydro-dynamic code SSS-MHD,confinement effect,by strong magnetic field during compression of field-reversed configuration(FRC)plasma target by solid liner,on the alpha particle energy transport is studied numerically.Also,investigations on the alpha particles self-heating(including local and non-local)and end loss effects are carried out.In the physical model,plasma energy is divided into three parts as that of DT ions,electrons,and alpha particles.In addition,fusion reaction in thermal equilibrium is taken into account.Numerical results imply that FRC target behaves like rigid rotor during solid liner compression.The compressed strong magnetic field can well define alpha particle energy in O-point area in target center rather than in the axis area,which is helpful for an FRC plasma burning.The non-local self-heating power peak value locates at O-point,but the local self-heating power maximum is beyond O-point.The plasma temperature peak value of local self-heating is about 0.5 times greater than that of non-local self-heating.In the script-off layer(SOL),end loss effect of alpha particle energy increases with the solid liner convergence.Especially in the SOL boundary,peak alpha particle energy loss rate appears.

关 键 词：固体套筒内爆 强磁场 Α粒子 端部效应 

分 类 号：O532[理学—等离子体物理]