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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.

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