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Title: Bright tunable femtosecond x-ray emission from laser irradiated micro-droplets

It is demonstrated that bright femtosecond X-rays can be obtained by irradiating a moderate laser onto a helium micro-droplet. The laser ponderomotive force continuously sweeps electrons from the droplets and accelerates them forward. The electrons exposed in the outrunning laser field oscillate transversely and emit photons in the forward direction. The total flux of photons with energies above 1 keV is as high as 10{sup 9}/shot which is about 10-fold enhancement compared with betatron oscillation under similar laser conditions. The maximum achieved peak brightness is up to 10{sup 21} photons/s/mm{sup 2}/mrad{sup 2}/0.1%BW. By adjusting laser and droplet parameters, we can get tunable X-rays with required brightness and energy.
Authors:
; ; ; ; ; ;  [1] ;  [2] ;  [3]
  1. College of Science, National University of Defense Technology, Changsha 410073 (China)
  2. School of Nuclear Science and Technology, University of South China, Hengyang 421001 (China)
  3. Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf (Germany)
Publication Date:
OSTI Identifier:
22303547
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BETATRON OSCILLATIONS; BRIGHTNESS; DROPLETS; ELECTRONS; EMISSION; HELIUM; IRRADIATION; LASER RADIATION; PHOTONS; PONDEROMOTIVE FORCE; X RADIATION