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19 April 2024

» arxiv » 1411.2134

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Compact tunable Compton x-ray source from laser-plasma accelerator and plasma mirror
Hai-En Tsai ; Xiaoming Wang ; Joseph Shaw ; Zhengyan Li ; Alexey V. Arefiev ; Xi Zhang ; Rafal Zgadzaj ; Watson Henderson ; V. Khudik ; G. Shvets ; M. C. Downer ;
Date:	8 Nov 2014
Abstract:	We present results of the first tunable Compton backscattering (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 $2 imes10^{7}$ 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.
Source:	arXiv, 1411.2134
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