Controlling the spectrum of x-rays generated in a laser-plasma accelerator by tailoring the laser wavefront

Details Controlling the spectrum of x-rays generated in a laser-plasma accelerator by tailoring the laser wavefront Controlling the spectrum of x-rays generated in a laser-plasma accelerator by tailoring the laser wavefront

2009-09-18

arxiv.org/abs/0909.3440v1

Physics

Plasma Physics

7 pages, 2 figures, submitted to Appl. Phys. Lett

Scientific paper

By tailoring the wavefront of the laser pulse used in a laser-wakefield accelerator, we show that the properties of the x-rays produced due to the electron beam's betatron oscillations in the plasma can be controlled. By creating a wavefront with coma, we find that the critical energy of the synchrotron-like x-ray spectrum can be significantly increased. The coma does not substantially change the energy of the electron beam, but does increase its divergence and produces an energy-dependent exit angle, indicating that changes in the x-ray spectrum are due to an increase in the electron beam's oscillation amplitude within the wakefield.

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