Abstract：We present the experimental and numerical results of two-dimensional x-ray imaging due to fast electron transport in a solid target. A 40-μm-thick copper film target is irradiated by a 100 mJ, 50 fs normal incident laser pulse. The full width at half maximum of the x-ray photon dose is 25 μm, and the divergence angle of fast electrons is 25°–30°, which is detected by the pin-hole x-ray imaging technique. The target surface plasma layer is compressed by a ponderomotive force into a depth of 0.2λ. The plasma wave accompanied by fast electrons transporting into the target is studied by dividing the plasma into layers in a radial direction. A narrow fast electron channel, which is approximately 8 μm–10 μm in width, mainly contributes to the x-ray dose.
. [J]. 中国物理快报, 2014, 31(05): 55201-055201.
TIAN Ye, WANG Wen-Tao, XIA Chang-Quan, WANG Cheng, XU Yi, LI Wen-Tao, QI Rong, ZHANG Zhi-Jun, LIANG Hong, YU Chang-Hai, LENG Yu-Xin, LIU Jian-Sheng. Fast Electron Spatial Temperature Distribution Studied by X-Ray 2D Imaging. Chin. Phys. Lett., 2014, 31(05): 55201-055201.
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2014, Vol. 31 
