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Title: The beat in laser-accelerated ion beams

Regular modulation in the ion velocity distribution becomes detectable if intense femtosecond laser pulses with very high temporal contrast are used for target normal sheath acceleration of ions. Analytical and numerical analysis of the experimental observation associates the modulation with the half-cycle of the driving laser field period. In processes like ion acceleration, the collective and laser-frequency determined electron dynamics creates strong fields in plasma to accelerate the ions. Even the oscillatory motion of electrons and its influence on the acceleration field can dominate over smoothing effects in plasma if a high temporal contrast of the driving laser pulse is given. Acceleration parameters can be directly concluded out of the experimentally observed modulation period in ion velocity spectra. The appearance of the phenomenon at a temporal contrast of ten orders between the intensity of the pulse peak and the spontaneous amplified emission background as well as remaining intensity wings at picosecond time-scale might trigger further parameter studies with even higher contrast.
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5]
  1. Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin (Germany)
  2. (Russian Federation)
  3. Vavilov State Optical Institut, Birzhevaya line 12, 199064 St. Petersburg (Russian Federation)
  4. XFEL GmbH, Notkestr. 85, 22607 Hamburg (Germany)
  5. (Germany)
Publication Date:
OSTI Identifier:
22218547
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 10; 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; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCELERATION; BEAM-PLASMA SYSTEMS; ELECTRONS; ION BEAMS; LASER RADIATION; LASERS; LIGHT TRANSMISSION; MODULATION; NUMERICAL ANALYSIS; PLASMA GUNS; PLASMA SHEATH; PULSES; SUPERRADIANCE