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Mitigation of two-plasmon decay in direct-drive inertial confinement fusion through the manipulation of ion-acoustic and Langmuir wave damping

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4807036· OSTI ID:1087577
 [1];  [2];  [3];  [3];  [4];  [5];  [5]
  1. Laboratory for Laser Energetics, University of Rochester 1 , 250 East River Road, Rochester, New York 14623-1299, USA; Laboratory for Laser Energetics, University of Rochester, Rochester, NY
  2. Electrical and Computer Engineering Department, University of California 2 , San Diego, 9500 Gilman Drive, La Jolla, California 92093-0407, USA
  3. Lodestar Research Corporation 3 , 2400 Central Avenue, P-5, Boulder, Colorado 80301, USA
  4. Laboratory for Laser Energetics, University of Rochester 1 , 250 East River Road, Rochester, New York 14623-1299, USA; Department of Mechanical Engineering, University of Rochester 4 , Rochester, New York 14627, USA
  5. Laboratory for Laser Energetics, University of Rochester 1 , 250 East River Road, Rochester, New York 14623-1299, USA
The extended Zakharov model of the two-plasmon decay instability in an inhomogeneous plasma [D. F. DuBois et al., Phys. Rev. Lett. 74, 3983 (1995); D. A. Russell and D. F. DuBois, Phys. Rev. Lett. 86, 428 (2001)] is further generalized to include the evolution of the electron distribution function in the quasi-linear approximation [cf., e.g., K. Y. Sanbonmatsu et al. Phys. Plasmas 7, 2824 (2000); D. A. Russell et al., paper presented at the Workshop on SRS/SBS Saturation, Wente Vineyards, Livermore, CA, 2–5 April 2002]. This makes it possible to investigate anomalous absorption of laser light and hot electron production due to the two-plasmon decay instability of multiple overlapping electromagnetic waves. Scalings of hot-electron production in the (stationary) nonlinearly saturated regime relevant to recent experiments [B. Yaakobi et al., Phys. Plasmas 19, 012704 (2012); D. H. Froula et al., Phys. Rev. Lett. 108, 165003 (2012)] have been obtained. They indicate a sensitivity to ion-acoustic wave (IAW) damping and to the collisional absorption of Langmuir waves. Such a sensitivity might be exploited in inertial confinement fusion target design by the use of mid-Z ablators.
Research Organization:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Organization:
USDOE
DOE Contract Number:
FC52-08NA28302
OSTI ID:
1087577
Report Number(s):
DOE/NA/28302-1121; 2013-3; 2093
Journal Information:
Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 20; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English

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