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Title: On the small divergence of laser-driven ion beams from nanometer thick foils

We report on experimental studies of divergence of proton beams from nanometer thick diamond-like carbon foils irradiated by a linearly polarized intense laser with high contrast. Proton beams with extremely small divergence (half angle) of 2° are observed in addition with a remarkably well-collimated feature over the whole energy range, showing one order of magnitude reduction of the divergence angle in comparison to the results from μm thick targets. Similar features are reproduced in two-dimensional particle-in-cell simulations with parameters representing our experiments, indicating a strong influence from the electron density distribution on the divergence of protons. Our comprehensive experimental study reveals grand opportunities for using nm foils in experiments that require high ion flux and small divergence.
Authors:
; ; ; ; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4] ; ; ;  [1] ;  [5]
  1. Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching (Germany)
  2. (Germany)
  3. Max-Planck-Institut für Quantenoptik, D-85748 Garching (Germany)
  4. (China)
  5. State Key Laboratory of Nuclear Physics and Technology, and Key Lab of High Energy Density Physics Simulation, CAPT, Peking University, Beijing 100871 (China)
Publication Date:
OSTI Identifier:
22227976
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 7; 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; 43 PARTICLE ACCELERATORS; BEAM-PLASMA SYSTEMS; COMPARATIVE EVALUATIONS; DIAMONDS; ELECTRON DENSITY; ION BEAMS; IRRADIATION; LASER TARGETS; LASER-PRODUCED PLASMA; PLASMA DENSITY; PLASMA PRODUCTION; PLASMA SIMULATION; PROTON BEAMS; PROTONS; TWO-DIMENSIONAL CALCULATIONS