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Title: Shock wave acceleration of protons in inhomogeneous plasma interacting with ultrashort intense laser pulses

The acceleration of protons, triggered by solitary waves in expanded solid targets is investigated using particle-in-cell simulations. The near-critical density plasma is irradiated by ultrashort high power laser pulses, which generate the solitary wave. The transformation of this soliton into a shock wave during propagation in plasma with exponentially decreasing density profile is described analytically, which allows to obtain a scaling law for the proton energy. The high quality proton bunch with small energy spread is produced by reflection from the shock-front. According to the 2D simulations, the mechanism is stable only if the laser pulse duration is shorter than the characteristic development time of the parasitic Weibel instability.
Authors:
 [1] ;  [1] ;  [2]
  1. ELI-ALPS, ELI-HU Nkft., Szeged (Hungary)
  2. (Germany)
Publication Date:
OSTI Identifier:
22408340
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; COMPUTERIZED SIMULATION; INHOMOGENEOUS PLASMA; LASER TARGETS; LASERS; PLASMA DENSITY; PLASMA INSTABILITY; PROTONS; PULSES; REFLECTION; SCALING LAWS; SHOCK WAVES; SOLITONS; TWO-DIMENSIONAL CALCULATIONS; WAVE PROPAGATION