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Title: Mitigation of cross-beam energy transfer in symmetric implosions on OMEGA using wavelength detuning

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4985315· OSTI ID:1366441

The effects of frequency detuning laser beams in direct-drive symmetric implosions were investigated with a 3-D cross-beam energy transfer (CBET) model. Our model shows that interactions between beams with relative angles between 45° and 90° are most significant for CBET in OMEGA direct-drive implosions. There is no net exchange in power between beams but there is significant redistribution of power from the ingoing central portion of the beam profile to the outgoing edge as it is exiting the plasma, reducing the total absorbed power. Furthermore, redistribution of laser power because of CBET increases the root-mean-square (rms) absorption nonuniformity by an order of magnitude. CBET mitigation by shifting relative wavelengths of three groups of laser beams fed by each of the different beamlines was modeled. At an on-target wavelength shift of Δλ ~ 10 Å, the total laser absorption was maximized, and the rms absorption nonuniformity was near minimum. In order to completely decouple the three groups of beams from each other requires wavelength shifts Δλ > 30 Å.

Research Organization:
Univ. of Rochester, NY (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001944
OSTI ID:
1366441
Alternate ID(s):
OSTI ID: 1372508
Report Number(s):
2017-11, 1342; 2017-11, 1342, 2296
Journal Information:
Physics of Plasmas, Vol. 24, Issue 6; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (5)

Analysis of trends in experimental observables: Reconstruction of the implosion dynamics and implications for fusion yield extrapolation for direct-drive cryogenic targets on OMEGA journal June 2018
Unabsorbed light beamlets for diagnosing cross-beam energy transfer journal October 2018
Crossed beam energy transfer in the presence of laser speckle ponderomotive self-focusing and nonlinear sound waves journal February 2020
Crossed-beam energy transfer: polarization effects and evidence of saturation journal April 2018
High-energy parametric amplification of spectrally incoherent broadband pulses journal January 2020