Abstract
Ion acceleration in electrostatic collisionless shocks is driven by the interaction of the high-power laser with specially tailored near-relativistic critical density plasma. 2D EPOCH particle-in-cell simulations show that the ion acceleration is dependent on the target material used. In materials with low charge-to-mass ratio.
Highlights
The development of high-intensity laser systems has opened a new era for laser-driven ions acceleration and there are several promising mechanisms for laser-driven ion acceleration
Ion acceleration in electrostatic collisionless shocks is driven by the interaction of the high-power laser with specially tailored near-relativistic critical density plasma. 2D EPOCH particle-in-cell simulations show that the ion acceleration is dependent on the target material used
The velocity distribution of the upstream expanding protons is further broadened toward the higher velocity by the electrostatic ion two-stream instability between reflected protons, which results in large number of protons being accelerated by the shock
Summary
The development of high-intensity laser systems has opened a new era for laser-driven ions acceleration and there are several promising mechanisms for laser-driven ion acceleration. The most widely understood mechanism is Target Normal Sheath Acceleration (TNSA) This mechanism [6] and a related radiation-pressure hybrid-scheme [7] can drive protons to energies approaching 100 MeV. Collisionless shock acceleration (CSA) has been proposed separately by Denavit [11] and Silva [12], with a detailed theoretical investigation complemented by Fiuza [13] These studies suggest that a special near-critical density profile, Ncr, is important in order to control the sheath electric field, ETNSA, at the plasma-vacuum interface. This in turn affects the ion spectrum in CSA. This paper is the first investigation on the material (or hZ=Ai) dependence of EITI on CSA
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