Abuazoum S, Wiggins S M, Issac R C, Welsh G H, Vieux G, Ganciu M, Jaroszynski D A
Department of Physics, Scottish Universities Physics Alliance, University of Strathclyde, Glasgow G4 0NG, United Kingdom.
Rev Sci Instrum. 2011 Jun;82(6):063505. doi: 10.1063/1.3600900.
We present an all solid-state, high voltage pulsed power supply for inducing stable plasma formation (density ∼10(18) cm(-3)) in gas-filled capillary discharge waveguides. The pulser (pulse duration of 1 μs) is based on transistor switching and wound transmission line transformer technology. For a capillary of length 40 mm and diameter 265 μm and gas backing pressure of 100 mbar, a fast voltage pulse risetime of 95 ns initiates breakdown at 13 kV along the capillary. A peak current of ∼280 A indicates near complete ionization, and the r.m.s. temporal jitter in the current pulse is only 4 ns. Temporally stable plasma formation is crucial for deploying capillary waveguides as plasma channels in laser-plasma interaction experiments, such as the laser wakefield accelerator.
我们展示了一种全固态高压脉冲电源，用于在充气毛细管放电波导中诱导形成稳定的等离子体（密度约为10¹⁸ cm⁻³）。该脉冲发生器（脉冲持续时间为1 μs）基于晶体管开关和绕线传输线变压器技术。对于长度为40 mm、直径为265 μm的毛细管以及100 mbar的气体背压，95 ns的快速电压脉冲上升时间在13 kV时沿毛细管引发击穿。约280 A的峰值电流表明几乎完全电离，并且电流脉冲中的均方根时间抖动仅为4 ns。对于在诸如激光尾场加速器等激光 - 等离子体相互作用实验中，将毛细管波导用作等离子体通道而言，时间上稳定的等离子体形成至关重要。
