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Title: Effect of resistivity gradient on laser-driven electron transport and ion acceleration

The effect of resistivity gradient on laser-driven electron transport and ion acceleration is investigated using collisional particle-in-cell simulation. The study is motivated by recent proton acceleration experiments [Gizzi et al., Phys. Rev. ST Accel. Beams 14, 011301 (2011)], which showed significant effect of the resistivity gradient in layered targets on the proton angular spread. This effect is reproduced in the present simulations. It is found that resistivity-gradient generation of magnetic fields and inhibition of electron transport is significantly enhanced when the feedback interaction between the magnetic field and the fast-electron current is included. Filamentation of the laser-generated hot electron jets inside the target, considered as the origin of the nonuniform proton patterns observed in the experiments, is clearly suppressed by the resistive magnetic field. As a result, the electrostatic sheath field at the target back surface acquires a relatively smooth profile, which contributes to the superior quality of the proton beams accelerated off layered targets in the experiments.
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. College of Science, National University of Defense Technology, Changsha 410073 (China)
  2. (China)
  3. Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027 (China)
  4. (Germany)
Publication Date:
OSTI Identifier:
22220623
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 9; Other Information: (c) 2013 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; CURRENTS; ELECTRONS; FEEDBACK; INTERACTIONS; LASERS; MAGNETIC FIELDS; PLASMA GUNS; PLASMA JETS; PLASMA SIMULATION; PROTON BEAMS; PROTONS