Cross-Beam Energy Transfer Saturation by Ion Heating

We measure cross-beam energy transfer (CBET) saturation by ion heating in a gas-jet plasma characterized using Thomson scattering. A wavelength-tunable ultraviolet (UV) probe laser beam interacts with four intense UV pump beams to drive large-amplitude ion-acoustic waves. For the highest-intensity i...

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Bibliographic Details
Published inPhysical review letters Vol. 126; no. 7; p. 075002
Main Authors Hansen, A M, Nguyen, K L, Turnbull, D, Albright, B J, Follett, R K, Huff, R, Katz, J, Mastrosimone, D, Milder, A L, Yin, L, Palastro, J P, Froula, D H
Format Journal Article
LanguageEnglish
Published United States 19.02.2021
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Summary:We measure cross-beam energy transfer (CBET) saturation by ion heating in a gas-jet plasma characterized using Thomson scattering. A wavelength-tunable ultraviolet (UV) probe laser beam interacts with four intense UV pump beams to drive large-amplitude ion-acoustic waves. For the highest-intensity interactions, the power transfer to the probe laser drops, demonstrating ion-acoustic wave saturation. Over this time, the ion temperature is measured to increase by a factor of 7 during the 500-ps interaction. Particle-in-cell simulations show ion trapping and a subsequent ion heating consistent with measurements. Linear kinetic CBET models are found to agree well with the observed energy transfer when the measured plasma conditions are used.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.126.075002