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Title: Simulations and measurements of hot-electron generation driven by the multibeam two-plasmon-decay instability

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4998934· OSTI ID:1416323

We report that multiple-beam experiments relevant to direct-drive inertial confinement fusion show the importance of nonlinear saturation mechanisms in the common-wave two-plasmon-decay (TPD) instability. Planar target experiments on the OMEGA laser used hard-x-ray measurements to study the influence of the linear common-wave growth rate on TPD driven hot-electron production in two drive beam configurations and over a range of overlapped laser intensities from 3.6 to 15.2 x 1014 W/cm2. The beam configuration with the larger linear common-wave growth rate had a lower intensity threshold for the onset of hot-electron production, but the linear growth rate did not have a significant impact on hot-electron production at high intensities. The experiments were modeled in 3-D using a hybrid code (LPSE) that combines a wave solver with a particle tracker to self-consistently calculate the electron velocity distribution and evolve electron Landau damping. Finally, good quantitative agreement was obtained between the simulated and measured hotel-electron distributions using a novel technique to account for macroscopic spatial and temporal variations that are present in the experiments.

Research Organization:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001944
OSTI ID:
1416323
Alternate ID(s):
OSTI ID: 1405548
Report Number(s):
2017-99; 1365; 2017-99, 2321, 1365; TRN: US1800922
Journal Information:
Physics of Plasmas, Vol. 24, Issue 10; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (5)

Resonance absorption of a broadband laser pulse journal December 2018
Studies of laser-plasma interaction physics with low-density targets for direct-drive inertial confinement schemes journal July 2019
Linear theory of multibeam parametric instabilities in homogeneous plasmas journal June 2019
Thresholds of absolute instabilities driven by a broadband laser journal June 2019
Comprehensive Zakharov-type model for parametric instabilities in the corona of direct-drive targets journal July 2019

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