Magnetic fields driven by a laser in coil targets were studied for laser energies of ∼25 J and two pulse durations of 2.8 ns and 70 ps. Axial magnetic fields in the coils were measured by continuous wave Faraday rotation diagnostics. The diagnostics indicated magnetic fields of 6–14 T in the coil and currents of 10–20 kA. Magnetic fields were compared for similar laser targets, focusing conditions, and laser energies. A 30-times increase in the intensity of the laser beam by reducing the pulse duration resulted in an increase in the magnetic field and current by a factor of 2. The relaxation time of the magnetic pulse was on the sub-microsecond scale.

中文翻译：

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具有连续波法拉第旋转诊断的激光驱动磁场研究

研究了线圈目标中激光驱动的磁场，激光能量约为 25 J，两个脉冲持续时间为 2.8 ns 和 70 ps。通过连续波法拉第旋转诊断测量线圈中的轴向磁场。诊断表明线圈中的磁场为 6-14 T，电流为 10-20 kA。对相似的激光目标、聚焦条件和激光能量的磁场进行了比较。通过减少脉冲持续时间，激光束强度增加 30 倍，导致磁场和电流增加 2 倍。磁脉冲的弛豫时间在亚微秒级。