Study of laser produced plasma in a longitudinal magnetic field
Study of laser produced plasma in a longitudinal magnetic field
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DOI：
10.1063/1.5091702
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发表时间：
2019-06-01
影响因子：
2.2
通讯作者：
Wong, N. L.
中科院分区：
文献类型：
--
作者：
Ivanov, V. V.;Maximov, A. V.;Wong, N. L.
利用1 MA脉冲功率发生器和50 TW激光器对纵向磁场中的激光等离子体进行了研究。内径为2.5-3.5mm的半匝线圈负载在负载附近产生50- 70 T的轴向磁场。用强度为10（18）-10（19）W/cm（2）的亚皮秒激光脉冲辐照线圈负载磁场中的薄Si箔靶。激光产生的等离子体羽流在纵向场内准直成直径为0.2-0.3mm、长度为3- 4 mm、电子等离子体密度在射流轴上为（0.2-1）× 10（20）cm（-3）的窄射流。喷流以160- 200 km/s的速度传播，与磁流体动力学模拟基本一致。X射线光谱测量表明，在等离子体中的电子密度的增加，导致从磁约束的射流。
Laser produced plasma embedded in a longitudinal magnetic field was studied using a 1 MA pulsed power generator coupled with a 50 TW laser. Half turn coil loads with an internal diameter of 2.5-3.5mm generate a 50-70T axial magnetic field near the load. A subpicosecond laser pulse with an intensity of 10(18)-10(19) W/cm(2) irradiates a thin Si foil target in the magnetic field of the coil load. A laser produced plasma plume collimates within the longitudinal field to a narrow jet 0.2-0.3mm in diameter with a length of 3-4mm and an electron plasma density of (0.2-1)x10(20) cm(-3) on the jet axis. The jet propagates with a velocity of 160-200km/s in general agreement with magnetohydrodynamic simulations. X-ray spectral measurements show an increase in the plasma electron density resulting from the magnetic confinement of the jet.