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Title: Measurements of the energy spectrum of electrons emanating from solid materials irradiated by a picosecond laser

Here, we present the results of experiments observing the properties of the electron stream generated laterally when a laser irradiates a metal. We also found that the directionality of the electrons is dependent upon their energies, with the higher-energy tail of the spectrum ( 1MeV and higher) being more narrowly focused. This behavior is likely due to the coupling of the electrons to the electric field of the laser. We performed these experiments by using the Titan laser to irradiate a metal wire, creating the electron stream of interest. These electrons propagate to nearby spectator wires of differing metals, causing them to fluoresce at their characteristic K-shell energies. This fluorescence is recorded by a crystal spectrometer. By varying the distances between the wires, we are able to probe the divergence of the electron stream, while by varying the medium through which the electrons propagate (and hence the energy-dependence of electron attenuation), we are able to probe the energy spectrum of the stream.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3] ;  [3] ;  [3] ;  [4] ;  [1] ;  [1] ;  [5] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [6] ;  [7] more »;  [6] ;  [6] « less
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Artep, Inc., Ellicott City, Mary land 21042, USA
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of Michigan, Ann Arbor, MI (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Ecopulse, Inc., Springfield, VA (United States)
  6. Univ. of California, San Diego, CA (United States). Energy Research Center
  7. Univ. of Michigan, Ann Arbor, MI (United States); Univ. of California, San Diego, CA (United States). Energy Research Center
Publication Date:
OSTI Identifier:
1335896
Grant/Contract Number:
NA0001840; AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 4; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY