http://www.researchgate.net/profile/Hai_En_Tsai/publications Hai-En Tsai University of Texas at Austin · Department of Physics Article: Compact tunable Compton x-ray source from laser-plasma accelerator and plasma mirror ABSTRACT: We present results of the first tunable Compton back- scattering (CBS) x-ray source that is based on the easily aligned combination of a laser-plasma accelerator (LPA) and a plasma mirror (PM). The LPA is driven in the blowout regime by 30 TW, 30 fs laser pulses, and produces high-quality, tunable, quasi-monoenergetic electron beams. A thin plastic film near the gas jet exit efficiently retro-reflects the LPA driving pulse with relativistic intensity into oncoming electrons to produce 2×107 CBS x-ray photons per shot with 10-20 mrad angular divergence and 50 % (FWHM) energy spread without detectable bremsstrahlung background. The x-ray central energy is tuned from 75 KeV to 200 KeV by tuning the LPA e-beam central energy. Particle-in-cell simulations of the LPA, the drive pulse/PM interaction and CBS agree well with measurements. arXiv. 11/2014; arXiv:1411.2134v2. ====== 有朝一日蔡海恩接到瑞典皇家学会的电话通知 浊水溪公社的人就要团结起来 --

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