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Full aperture backscatter station imager (FABSI) diagnostics system for far-field imaging of laser plasma instabilities on Nova

Conference ·
OSTI ID:244634
; ; ; ; ; ;  [1];  [2]
  1. Los Alamos National Lab., NM (United States)
  2. SAIC, Albuquerque, NM (United States)
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In ICF, the understanding of laser plasma scattering processes is essential for laser target coupling and in controlling the symmetry of indirect drive implosions. The existing Nova Full Aperture Backscatter Station (FABS) has been useful in understanding laser plasma instabilities occurring in hohlraums by measuring the quantity, spectral distribution and near-field spatial distributions of Brillouin and more recently Raman backscatter. Equally important is an understanding of the farfield spatial intensity distribution which provides information on density, temperature and velocity gradient distributions, and which affect capsule implosion symmetry in hohlraums. Such information could potentially help in understanding processes such as filamentation and saturation mechanism. This paper describes a broad-band, color-corrected far-field imager and associated diagnostics capable of imaging the source of scattered light to better than 25 {micro}m resolution. The imager can either image Brillouin or Raman backscatter through the Nova beam 7 focusing lens or be used like a microscope to image side scatter from other beams.
Research Organization:
Los Alamos National Lab., NM (United States)
Sponsoring Organization:
USDOE, Washington, DC (United States)
DOE Contract Number:
W-7405-ENG-36
OSTI ID:
244634
Report Number(s):
LA-UR--96-1653; CONF-9606208--8; ON: DE96011273
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BACKSCATTERING
BRILLOUIN EFFECT
DECAY INSTABILITY
INDIRECT DRIVE LASER IMPLOSION
INERTIAL CONFINEMENT
LASER TARGETS
NOVA FACILITY
OPTICAL SYSTEMS
PARAMETRIC INSTABILITIES
PLASMA DIAGNOSTICS
RAMAN EFFECT