Fast Electron Spatial Temperature Distribution Studied by X-Ray 2D Imaging

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2014,（5）
• 页码范围: 89-92
• 页数: 4页
• 语种: 中文
• DOI: 10.1088/0256-307X/31/5/055201

摘要

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 100m J,50rs normal incident laser pulse.The full width at half maximum of the x-ray photon dose is 25μm,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 8μm-10μm in width,mainly contributes to the x-ray dose.