| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Fast Electron Spatial Temperature Distribution Studied by X-Ray 2D Imaging |
| TIAN Ye1, WANG Wen-Tao1, XIA Chang-Quan2, WANG Cheng1, XU Yi1, LI Wen-Tao1, QI Rong1, ZHANG Zhi-Jun1, LIANG Hong1, YU Chang-Hai1, LENG Yu-Xin1, LIU Jian-Sheng1** |
1Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
2Yangzhou University, Yangzhou 225009
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| Cite this article: |
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TIAN Ye, WANG Wen-Tao, XIA Chang-Quan et al 2014 Chin. Phys. Lett. 31 055201 |
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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.
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Published: 24 April 2014
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| PACS: |
52.38.Ph
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(X-ray, γ-ray, and particle generation)
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52.70.La
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(X-ray and γ-ray measurements)
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52.65.Rr
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(Particle-in-cell method)
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