Energy scaling of quasi-monoenergetic electron beams from laser wakefields driven by 40-TW ultra-short pulses
- First Online:
- 82 Downloads
By focusing 40-TW, 30-fs laser pulses to the peak intensity of 1019 W/cm2 onto a supersonic He gas jet, we generate quasi-monoenergetic electron beams for plasma density in the specific range 1.5×1019 cm-3≤ne≤3.5×1019 cm-3. We show that the energy, charge, divergence and pointing stability of the beam can be controlled by changing ne, and that higher electron energies and more stable beams are produced for lower densities. The observed variations are explained physically by the interplay among pump depletion and dephasing between accelerated electrons and plasma wave. Two-dimensional particle-in-cell simulations support the explanation by showing the evolution of the laser pulse in plasma and the specifics of electron injection and acceleration. An optimized quasi-monoenergetic beam of over 300 MeV and 10 mrad angular divergence is demonstrated at a plasma density of ne≃1.5×1019 cm-3.
Unable to display preview. Download preview PDF.
- 15.S. Bulanov, T. Tajima, J. Part. Accel. Soc. Japan. 2, 35 (2005)Google Scholar
- 21.S.A. Reed, C.R. Vane, V. Yanovsky, V. Chvykov, G. Kalintchenko, T. Matsuoka, D. Stracener, J.R. Beene, D.R. Schultz, A. Maksimchuk, J. Appl. Phys. 102, 073103 (2007)Google Scholar
- 23.A. Maksimchuk, S. Reed, N. Naumova, V. Chvykov, B. Hou, G. Kalintchenko, T. Matsuoka, J. Nees, P. Rousseau, G. Mourou, V. Yanovsky, in Proceedings of Inertial Fusion Sciences and Applications Conference 2005, ed. by J.-C. Gauthier [J. Phys. IV Fr. 133, 1123 (2006)]Google Scholar
- 27.S.V. Bulanov, I.N. Inovenkov, V.I. Kirsanov, N.M. Naumova, A.S. Sakharov, Phys. Fluids B 4, 1935 (1992)Google Scholar