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

Mangles, S. P. D.; Genoud, G.; Kneip, S.; Burza, M.; Cassou, K.; Cros, B.; Dover, N. P.; Kamperidis, C.; Najmudin, Z.; Persson, A.; Schreiber, J.; Wojda, F.; Wahlström, C.-G.
November 2009
Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p181106
Academic Journal
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 synchrotronlike 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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