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Title: Performance of direct-drive cryogenic targets on OMEGA

Abstract

The success of direct-drive-ignition target designs depends on two issues: the ability to maintain the main fuel adiabat at a low level and the control of the nonuniformity growth during the implosion. A series of experiments was performed on the OMEGA Laser System [T. R. Boehly, D. L. Brown, R. S. Craxton et al., Opt. Commun. 133, 495 (1997)] to study the physics of low-adiabat, high-compression cryogenic fuel assembly. Modeling these experiments requires an accurate account for all sources of shell heating, including shock heating and suprathermal electron preheat. To increase calculation accuracy, a nonlocal heat-transport model was implemented in the 1D hydrocode. High-areal-density cryogenic fuel assembly with {rho}R>200 mg/cm{sup 2} [T. C. Sangster, V. N. Goncharov, P. B. Radha et al., 'High-areal-density fuel assembly in direct-drive cryogenic implosions', Phys. Rev. Lett. (submitted)] has been achieved on OMEGA in designs where the shock timing was optimized using the nonlocal treatment of the heat conduction and the suprathermal-electron preheat generated by the two-plasmon-decay instability was mitigated.

Authors:
 [1]; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [2]
  1. Laboratory for Laser Energetics and Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623 (United States)
  2. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)
Publication Date:
OSTI Identifier:
21120387
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 15; Journal Issue: 5; Other Information: DOI: 10.1063/1.2856551; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCURACY; COMPRESSION; CONTROL; DECAY INSTABILITY; DENSITY; DESIGN; ELECTRONS; FUEL ASSEMBLIES; IMPLOSIONS; LASERS; PERFORMANCE; SHOCK HEATING; THERMAL CONDUCTION; THERMONUCLEAR REACTORS

Citation Formats

Goncharov, V N, Sangster, T C, Radha, P B, Boehly, T R, Collins, T J. B., Craxton, R S, Delettrez, J A, Epstein, R, Glebov, V Yu, Hu, S X, Igumenshchev, I V, Knauer, J P, Loucks, S J, Marozas, J A, Marshall, F J, McKenty, P W, Regan, S P, Seka, W, Skupsky, S, and Smalyuk, V A. Performance of direct-drive cryogenic targets on OMEGA. United States: N. p., 2008. Web. doi:10.1063/1.2856551.
Goncharov, V N, Sangster, T C, Radha, P B, Boehly, T R, Collins, T J. B., Craxton, R S, Delettrez, J A, Epstein, R, Glebov, V Yu, Hu, S X, Igumenshchev, I V, Knauer, J P, Loucks, S J, Marozas, J A, Marshall, F J, McKenty, P W, Regan, S P, Seka, W, Skupsky, S, & Smalyuk, V A. Performance of direct-drive cryogenic targets on OMEGA. United States. https://doi.org/10.1063/1.2856551
Goncharov, V N, Sangster, T C, Radha, P B, Boehly, T R, Collins, T J. B., Craxton, R S, Delettrez, J A, Epstein, R, Glebov, V Yu, Hu, S X, Igumenshchev, I V, Knauer, J P, Loucks, S J, Marozas, J A, Marshall, F J, McKenty, P W, Regan, S P, Seka, W, Skupsky, S, and Smalyuk, V A. 2008. "Performance of direct-drive cryogenic targets on OMEGA". United States. https://doi.org/10.1063/1.2856551.
@article{osti_21120387,
title = {Performance of direct-drive cryogenic targets on OMEGA},
author = {Goncharov, V N and Sangster, T C and Radha, P B and Boehly, T R and Collins, T J. B. and Craxton, R S and Delettrez, J A and Epstein, R and Glebov, V Yu and Hu, S X and Igumenshchev, I V and Knauer, J P and Loucks, S J and Marozas, J A and Marshall, F J and McKenty, P W and Regan, S P and Seka, W and Skupsky, S and Smalyuk, V A},
abstractNote = {The success of direct-drive-ignition target designs depends on two issues: the ability to maintain the main fuel adiabat at a low level and the control of the nonuniformity growth during the implosion. A series of experiments was performed on the OMEGA Laser System [T. R. Boehly, D. L. Brown, R. S. Craxton et al., Opt. Commun. 133, 495 (1997)] to study the physics of low-adiabat, high-compression cryogenic fuel assembly. Modeling these experiments requires an accurate account for all sources of shell heating, including shock heating and suprathermal electron preheat. To increase calculation accuracy, a nonlocal heat-transport model was implemented in the 1D hydrocode. High-areal-density cryogenic fuel assembly with {rho}R>200 mg/cm{sup 2} [T. C. Sangster, V. N. Goncharov, P. B. Radha et al., 'High-areal-density fuel assembly in direct-drive cryogenic implosions', Phys. Rev. Lett. (submitted)] has been achieved on OMEGA in designs where the shock timing was optimized using the nonlocal treatment of the heat conduction and the suprathermal-electron preheat generated by the two-plasmon-decay instability was mitigated.},
doi = {10.1063/1.2856551},
url = {https://www.osti.gov/biblio/21120387}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 15,
place = {United States},
year = {Thu May 15 00:00:00 EDT 2008},
month = {Thu May 15 00:00:00 EDT 2008}
}