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Title: Nonlinear Laser-Plasma Interaction in Magnetized Liner Inertial Fusion

Sandia National Laboratories is pursuing a variation of Magneto-Inertial Fusion called Magnetized Liner Inertial Fusion, or MagLIF. The MagLIF approach requires magnetization of the deuterium fuel, which is accomplished by an initial external B-Field and laser-driven pre-heat. Although magnetization is crucial to the concept, it is challenging to couple sufficient energy to the fuel, since laser-plasma instabilities exist, and a compromise between laser spot size, laser entrance window thickness, and fuel density must be found. Ultimately, nonlinear processes in laser plasma interaction, or laser-plasma instabilities (LPI), complicate the deposition of laser energy by enhanced absorption, backscatter, filamentation and beam-spray. We determine and discuss key LPI processes and mitigation methods. Results with and without improvement measures are presented.
Authors:
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  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  3. Univ. of Texas at Austin (United States)
Publication Date:
OSTI Identifier:
1249071
Report Number(s):
SAND--2016-1681J
Journal ID: ISSN 0277-786X; 619902
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Proceedings of SPIE - The International Society for Optical Engineering
Additional Journal Information:
Journal Volume: 9731; Conference: Nonclinear Frequency Generation and Conversion: Materials, Devices and Applications XV, San Francisco, CA (United States), 4 Mar 2016; Journal ID: ISSN 0277-786X
Publisher:
SPIE
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY Lasers; Plasmas; Nonlinear dynamics; Absorption; Backscatter; MagLIF; LPI; SBS; high energy lasers