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Title: Unabsorbed light beamlets for diagnosing cross-beam energy transfer

Journal Article · · Review of Scientific Instruments
DOI: https://doi.org/10.1063/1.5036565 · OSTI ID:1460094
 [1];  [2]; ORCiD logo [2]; ORCiD logo [2]
  1. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics; Laboratory for Laser Energetics, University of Rochester
  2. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics

Here, a new diagnostic has been fielded on OMEGA to diagnose cross-beam energy transfer (CBET) during direct-drive implosions. Unabsorbed light from each OMEGA laser beam is imaged as a distinct “spot” onto a gated optical imager. Each spot is in essence the end point of a beamlet of light that originates from different regions of each beam profile and follows a path determined by refraction. The intensity of light in the beamlet varies along its path as a result of absorption and CBET with other beamlets. This diagnostic allows the investigation of the effects of CBET on laser energy from specific locations of the beam profile. The diagnostic records images in two 200-ps time windows and includes a Wollaston prism to split each beamlet into two orthogonal polarizations recorded on separate images, allowing the absolute polarization of each beamlet to be determined. This diagnostic has provided the first evidence of polarization rotation caused by CBET during direct-drive implosions.

Research Organization:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001944
OSTI ID:
1460094
Alternate ID(s):
OSTI ID: 1459476
Report Number(s):
2017-258, 2374; 2017-258, 2374, 1416
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 89; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (11)

Crossed-beam energy transfer in direct-drive implosions journal May 2012
Irradiation uniformity for high-compression laser-fusion experiments journal May 1999
Mitigation of cross-beam energy transfer: Implication of two-state focal zooming on OMEGA journal August 2013
Enhanced reflection of laser light from an expanding plasma journal November 1976
Laser-Beam Zooming to Mitigate Crossed-Beam Energy Losses in Direct-Drive Implosions journal April 2013
Mitigation of cross-beam energy transfer in symmetric implosions on OMEGA using wavelength detuning journal June 2017
Time-resolved absorption in cryogenic and room-temperature direct-drive implosions journal May 2008
Direct-drive inertial confinement fusion: A review journal November 2015
Energy transfer between crossing laser beams journal January 1996
Direct-drive laser fusion: Status and prospects journal May 1998
Laser Compression of Matter to Super-High Densities: Thermonuclear (CTR) Applications journal September 1972

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