Betatron x-ray production in mixed gases

F. Albert; B. B. Pollock; J. Shaw; K. A. Marsh; Y.-H. Chen; D. Alessi; J. E. Ralph; P. A. Michel; A. Pak; C. E. Clayton; S. H. Glenzer; C. Joshi

doi:10.1117/12.2017187

9 May 2013 Betatron x-ray production in mixed gases

F. Albert, B. B. Pollock, J. Shaw, K. A. Marsh, Y.-H. Chen, D. Alessi, J. E. Ralph, P. A. Michel, A. Pak, C. E. Clayton, S. H. Glenzer, C. Joshi

Author Affiliations +

Proceedings Volume 8779, Laser Acceleration of Electrons, Protons, and Ions II; and Medical Applications of Laser-Generated Beams of Particles II; and Harnessing Relativistic Plasma Waves III; 87791Q (2013) https://doi.org/10.1117/12.2017187
Event: SPIE Optics + Optoelectronics, 2013, Prague, Czech Republic

Abstract

Betatron x-rays with multi-keV photon energies have been observed from a GeV-class laser-plasma accelerator. The experiment was performed using the 200 TW Callisto laser system at LLNL to produce and simultaneously observe GeV-class electron beams and keV Betatron x-rays. The laser was focused with two different optics (f/8 and f/20), and into various gas cells with sizes ranging from 3 to 10 mm, and containing mixed gases (He, N, CO2, Ar, Ne) to accelerate large amounts of charge in the ionization induced trapping regime. KeV betatron x-rays were observed for various concentrations of gases. Electron spectra were measured on large image plates with the two-screen method after being deflected by a large 0.42 Tesla magnet spectrometer. Betatron oscillations observed on the electron spectra can be benchmarked against a simple analytical model (Runge-Kutta algorithm solving the equation of motion of an electron in the wakefield), in order to retrieve the electron injection conditions into the wake.

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F. Albert, B. B. Pollock, J. Shaw, K. A. Marsh, Y.-H. Chen, D. Alessi, J. E. Ralph, P. A. Michel, A. Pak, C. E. Clayton, S. H. Glenzer, and C. Joshi "Betatron x-ray production in mixed gases", Proc. SPIE 8779, Laser Acceleration of Electrons, Protons, and Ions II; and Medical Applications of Laser-Generated Beams of Particles II; and Harnessing Relativistic Plasma Waves III, 87791Q (9 May 2013); https://doi.org/10.1117/12.2017187

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