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

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.
Authors:
 [1] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Report Number(s):
2017-258, 2374
Journal ID: ISSN 0034-6748; 2017-258, 2374, 1416
Grant/Contract Number:
NA0001944
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Conference: 22nd Topical Conference on High Temperature Plasma Diagnostics, San Diego, CA (United States), 16-19 Apr 2018; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION
OSTI Identifier:
1460094
Alternate Identifier(s):
OSTI ID: 1459476

Edgell, D. H., Katz, J., Turnbull, D. P., and Froula, D. H.. Unabsorbed light beamlets for diagnosing cross-beam energy transfer. United States: N. p., Web. doi:10.1063/1.5036565.
Edgell, D. H., Katz, J., Turnbull, D. P., & Froula, D. H.. Unabsorbed light beamlets for diagnosing cross-beam energy transfer. United States. doi:10.1063/1.5036565.
Edgell, D. H., Katz, J., Turnbull, D. P., and Froula, D. H.. 2018. "Unabsorbed light beamlets for diagnosing cross-beam energy transfer". United States. doi:10.1063/1.5036565.
@article{osti_1460094,
title = {Unabsorbed light beamlets for diagnosing cross-beam energy transfer},
author = {Edgell, D. H. and Katz, J. and Turnbull, D. P. and Froula, D. H.},
abstractNote = {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.},
doi = {10.1063/1.5036565},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {7}
}

Works referenced in this record:

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journal, May 2012
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Direct-drive laser fusion: Status and prospects
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