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13Complex Systems of Charged Particles and their Interactions with Electromagnetic Radiation 2016
PLASMA SCALE LENGTH IMPACT ONTO ELECTRON ACCELERATION AT
INTENSITIES ABOVE 1018 W/CM2
A.Savel'ev1, I.Tsymbalov1, S.Shyluapov1, K.Ivanov1, D.Krestovskih1, R.Volkov1
2 2 2 3 3 3
V.Bychenkov , A.Brantov , P.Ksenofontov , V.Nedorezov , A.Lapik , A.Rusakov international Laser Centre & Faculty of Physics Lomonosov Moscow State University, Moscow,
Russia, e-mail: abst@physics.msu.ru;
2Lebedev Physical Institute RAS, Moscow, Russia: 3Institute for Nuclear Research RAS, Moscow, Russia
We search for optimal target conditions for electron acceleration followed by gamma-ray production. We report on experimental and numerical data on relativistic laser plasma interaction with plasma having different density gradients and compositions. Experiments were made at intensities of 3000-5000 PW/cm2 with 50 fs high contrast laser pulses. Plasma scalelength control was achieved using artificial nanosecond pre-pulse. Prominent increase in gamma-yield was observed for optimally designed plasma plumes as compared to the flat surface case. The hugest increase was obtained with specially designed sandwich-like structures irradiated by optimized nanosecond pre-pulse. Numerical simulations with the PIC code Mandor revealed mechanisms responsible for the observed processes.
The authors acknowledge the support from RFBR, Grants Nos. 16-02-00263, 16-0200213.
