A Fast, Electromagnetically Driven Supersonic Gas Jet Target For Laser Wakefield Acceleration*
A Fast, Electromagnetically Driven Supersonic Gas Jet Target For Laser Wakefield Acceleration*
复制标题
用于激光尾场加速的快速电磁驱动超音速气体射流目标*
DOI：
10.1063/1.3080916
复制
发表时间：
2009
影响因子：
2.2
通讯作者：
T. Ma
中科院分区：
文献类型：
--
作者：
M. Krishnan;J. D. Wright;T. Ma
激光尾迹加速(LWFA)承诺电子加速器具有前所未有的电场梯度。气体射流和充气毛细管放电波导是LWFA的两个主要选择目标。目前的气体射流在密度为1-4×10~(19) /cm~3时，长度只有2-4毫米，足以自捕获并加速到能量高达∼150 MeV的能量。虽然3厘米的毛细结构被用来将束流加速到1GeV，但气体射流需要一束准直良好的束流，其长度为⩾10 mm，宽度为<；500 μm，具有可调的气体密度分布，以优化LWFA工艺。本文介绍了一种电磁驱动的快速超音速气体阀门的设计，该阀门在<；100 μS内开启，在<；500 μS内关闭，并且可以在1000PSIA以上的压力下工作。利用激光测头测量了气门座(飞板)的运动，并与模型的预测结果进行了比较。该阀的设计是基于多个参数的优化：飞板质量和耐用性、驱动器组速度和储能。
Laser‐Wakefield acceleration (LWFA) promises electron accelerators with unprecedented electric field gradients. Gas jets and gas‐filled capillary discharge waveguides are two primary targets of choice for LWFA. Present gas jets have lengths of only 2–4 mm at densities of 1–4×1019 /cm3, sufficient for self‐trapping and acceleration to energies up to ∼150 MeV. While 3 cm capillary structures have been used to accelerate beams up to 1 GeV, gas jets require a well‐collimated beam that is ⩾10 mm in length and <500 μm in width, with a tunable gas density profile to optimize the LWFA process. This paper describes the design of an electromagnetically driven, fast supersonic gas valve that opens in <100 μs, closes in <500 μs and can operate at pressures beyond 1000 psia. The motion of the valve seat (flyer plate) is measured using a laser probe and compared with predictions of a model. The valve design is based on an optimization of many parameters: flyer plate mass and durability, driver bank speed and stored ene...