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Title: Time resolved detection of two-plasmon decay using three-halves harmonic emission on the National Ignition Facility

Abstract

Supra-thermal (>100 keV) electrons generated by laser plasma interactions can be detrimental to the performance of ignition experiments conducted on the National Ignition Facility (NIF). On a NIF shot, the amount of electrons is estimated by measuring the hard X-rays passing through the hohlraum wall. The primary sources of hot electrons in a hohlraum are Stimulated Raman Scattering (SRS) and two plasmon decay (TPD). While SRS is well diagnosed on the NIF, there has been no diagnosis of TPD. Here we have designed and implemented a new diagnostic to characterize the time history of TPD on the NIF. The instrument provides a time resolved measurement of the 3/2 ω harmonic emission which is indicative of the presence of TPD. We describe the diagnostic setup, calibration, and the preliminary results obtained on NIF hohlraum experiments. Finally, we find evidence of a correlation between measured hard X-rays generated from the hot electron bremsstrahlung and the TPD emission.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1482873
Alternate Identifier(s):
OSTI ID: 1464321
Report Number(s):
LLNL-JRNL-750292
Journal ID: ISSN 0034-6748; 935261
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 8; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; plasmons; plasma waves; laser fusion; plasma confinement; X-ray spectroscopy; hard X-rays; Raman scattering; phototubes; laser plasma interactions

Citation Formats

Goyon, C., Datte, P. S., Buscho, J. G., Butler, N. J., Hernandez, J. E., Hohenberger, M., Lechleiter, B. L., Michel, P., Ross, J. S., Bell, P. M., and Moody, J. D. Time resolved detection of two-plasmon decay using three-halves harmonic emission on the National Ignition Facility. United States: N. p., 2018. Web. doi:10.1063/1.5038094.
Goyon, C., Datte, P. S., Buscho, J. G., Butler, N. J., Hernandez, J. E., Hohenberger, M., Lechleiter, B. L., Michel, P., Ross, J. S., Bell, P. M., & Moody, J. D. Time resolved detection of two-plasmon decay using three-halves harmonic emission on the National Ignition Facility. United States. doi:10.1063/1.5038094.
Goyon, C., Datte, P. S., Buscho, J. G., Butler, N. J., Hernandez, J. E., Hohenberger, M., Lechleiter, B. L., Michel, P., Ross, J. S., Bell, P. M., and Moody, J. D. Mon . "Time resolved detection of two-plasmon decay using three-halves harmonic emission on the National Ignition Facility". United States. doi:10.1063/1.5038094. https://www.osti.gov/servlets/purl/1482873.
@article{osti_1482873,
title = {Time resolved detection of two-plasmon decay using three-halves harmonic emission on the National Ignition Facility},
author = {Goyon, C. and Datte, P. S. and Buscho, J. G. and Butler, N. J. and Hernandez, J. E. and Hohenberger, M. and Lechleiter, B. L. and Michel, P. and Ross, J. S. and Bell, P. M. and Moody, J. D.},
abstractNote = {Supra-thermal (>100 keV) electrons generated by laser plasma interactions can be detrimental to the performance of ignition experiments conducted on the National Ignition Facility (NIF). On a NIF shot, the amount of electrons is estimated by measuring the hard X-rays passing through the hohlraum wall. The primary sources of hot electrons in a hohlraum are Stimulated Raman Scattering (SRS) and two plasmon decay (TPD). While SRS is well diagnosed on the NIF, there has been no diagnosis of TPD. Here we have designed and implemented a new diagnostic to characterize the time history of TPD on the NIF. The instrument provides a time resolved measurement of the 3/2 ω harmonic emission which is indicative of the presence of TPD. We describe the diagnostic setup, calibration, and the preliminary results obtained on NIF hohlraum experiments. Finally, we find evidence of a correlation between measured hard X-rays generated from the hot electron bremsstrahlung and the TPD emission.},
doi = {10.1063/1.5038094},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 8,
volume = 89,
place = {United States},
year = {2018},
month = {8}
}

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Works referenced in this record:

Laser Compression of Matter to Super-High Densities: Thermonuclear (CTR) Applications
journal, September 1972

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