Suprathermal electrons generated by the two-plasmon-decay instability in gas-filled Hohlraums

Regan, S. P.; Meezan, N. B.; Suter, L. J.; Strozzi, D. J.; Kruer, W. L.; Meeker, D.; Glenzer, S. H.; Seka, W.; Stoeckl, C.; Glebov, V. Yu.; Sangster, T. C.; Meyerhofer, D. D.; McCrory, R. L.; Williams, E. A.; Jones, O. S.; Callahan, D. A.; Rosen, M. D.; Landen, O. L.; Sorce, C.; MacGowan, B. J.
February 2010
Physics of Plasmas;Feb2010, Vol. 17 Issue 2, p020703
Academic Journal
For the first time a burst of suprathermal electrons is observed from the exploding laser-entrance-hole window of gas-filled Hohlraums driven with 13.5 kJ of 351 nm laser light. The two-plasmon-decay instability appears to produce up to 20 J of hot electrons with Thot∼75 keV at early times and has a sharp laser-intensity threshold between 0.3 and 0.5×1015 W/cm2. The observed threshold can be exploited to mitigate preheat by window hot electrons in ignition Hohlraums for the National Ignition Facility and achieve high-density, high-pressure conditions in indirect drive implosions.


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