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Title: Preplasma effects on the generation of high-energy protons in ultraintense laser interaction with foil targets

It is shown that the intense quasistatic electric and magnetic fields self-generated near the axis of the laser-driven channel in an appropriately profiled preplasma during ultraintense laser interaction with a thin target can create dense relativistic electron bunches. The latter easily penetrate through the target and can greatly enhance the sheath field at the rear, resulting in significant increase in the laser-to-ion energy conversion efficiency and the maximum energy of the target normal sheath accelerated ions. Particle-in-cell simulations show that with a hydrogen targets a proton beam of peak energy ∼38 MeV and energy conversion efficiency ≥6.5% can be produced by a linearly polarized 5 × 10{sup 19} W/cm{sup 2} laser. An analytical model is also proposed and its results agree well with those of the simulations.
Authors:
;  [1] ; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [2] ;  [2]
  1. Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871 (China)
  2. (China)
  3. Institute of Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027 (China)
  4. (Germany)
Publication Date:
OSTI Identifier:
22218360
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 12; 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; ELECTRONS; ENERGY CONVERSION; FOILS; HYDROGEN; IONS; LASER TARGETS; LASER-PRODUCED PLASMA; LASERS; MAGNETIC FIELDS; MEV RANGE; PLASMA PRODUCTION; PLASMA SHEATH; PLASMA SIMULATION; PROTON BEAMS; PROTONS; RELATIVISTIC PLASMA