Mitigation of cross-beam energy transfer in inertial-confinement-fusion plasmas with enhanced laser bandwidth

Bates, Jason W.; Myatt, J. F.; Shaw, J. G.; Follett, R. K.; Weaver, James L.; Lehmberg, R. H.; Obenschain, S. P.

doi:10.1103/physreve.97.061202

Cited by 50 publications

(18 citation statements)

References 61 publications

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“…Multi-THz bandwidth could further reduce growth of TPD. [12]. CBET has been shown to be a major loss (30%) of drive power in OMEGA direct-drive implosions [13].…”

Section: Laser Target Interaction With An Argon Fluoride Drivermentioning

confidence: 99%

“…However, simulations and theory indicate multi-THz bandwidths may be effective at suppressing certain types of LPI. For example, laser plasma interaction simulations indicate that 2 THz bandwidth begins to suppress cross beam energy transfer (CBET), and 5 THz almost completely suppresses it [12]. CBET has been shown to be a major loss (30%) of drive power in OMEGA direct-drive implosions [13].…”

Section: Laser Target Interaction With An Argon Fluoride Drivermentioning

confidence: 99%

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Direct drive with the argon fluoride laser as a path to high fusion gain with sub-megajoule laser energy

Obenschain

Schmitt

Bates

et al. 2020

Phil. Trans. R. Soc. A.

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Argon fluoride (ArF) is currently the shortest wavelength laser that can credibly scale to the energy and power required for high gain inertial fusion. ArF's deep ultraviolet light and capability to provide much wider bandwidth than other contemporary inertial confinement fusion (ICF) laser drivers would drastically improve the laser target coupling efficiency and enable substantially higher pressures to drive an implosion. Our radiation hydrodynamics simulations indicate gains greater than 100 are feasible with a sub-megajoule ArF driver. Our laser kinetics simulations indicate that the electron beam-pumped ArF laser can have intrinsic efficiencies of more than 16%, versus about 12% for the next most efficient krypton fluoride excimer laser. We expect at least 10% ‘wall plug' efficiency for delivering ArF light to target should be achievable using solid-state pulsed power and efficient electron beam transport to the laser gas that was demonstrated with the U.S. Naval Research Laboratory's Electra facility. These advantages could enable the development of modest size and lower cost fusion power plant modules. This would drastically change the present view on inertial fusion energy as being too expensive and the power plant size too large. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 1)'.

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“…Multi-THz bandwidth could further reduce growth of TPD. [12]. CBET has been shown to be a major loss (30%) of drive power in OMEGA direct-drive implosions [13].…”

Section: Laser Target Interaction With An Argon Fluoride Drivermentioning

confidence: 99%

Section: Laser Target Interaction With An Argon Fluoride Drivermentioning

confidence: 99%

Direct drive with the argon fluoride laser as a path to high fusion gain with sub-megajoule laser energy

Obenschain

Schmitt

Bates

et al. 2020

Phil. Trans. R. Soc. A.

Self Cite

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“…Given nominal experimental parameters bandwidths of the order of 10 THz are required. Figure 17 a shows LPSE results for suppressing CBET and increasing target absorption [49] as a function of fractional bandwidth. Figure 17 b also shows the significant improvement in laser smoothing that would also drastically reduce laser imprint.…”

Section: Laser–plasma Interaction Researchmentioning

confidence: 99%

Direct-drive laser fusion: status, plans and future

Campbell

Sangster

Goncharov

et al. 2020

Phil. Trans. R. Soc. A.

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Laser-direct drive (LDD), along with laser indirect (X-ray) drive (LID) and magnetic drive with pulsed power, is one of the three viable inertial confinement fusion approaches to achieving fusion ignition and gain in the laboratory. The LDD programme is primarily being executed at both the Omega Laser Facility at the Laboratory for Laser Energetics and at the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory. LDD research at Omega includes cryogenic implosions, fundamental physics including material properties, hydrodynamics and laser–plasma interaction physics. LDD research on the NIF is focused on energy coupling and laser–plasma interactions physics at ignition-scale plasmas. Limited implosions on the NIF in the ‘polar-drive’ configuration, where the irradiation geometry is configured for LID, are also a feature of LDD research. The ability to conduct research over a large range of energy, power and scale size using both Omega and the NIF is a major positive aspect of LDD research that reduces the risk in scaling from OMEGA to megajoule-class lasers. The paper will summarize the present status of LDD research and plans for the future with the goal of ultimately achieving a burning plasma in the laboratory. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 2)’.

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“…Mitigation of laser-plasma instabilities through increasing the bandwidth of the driving laser beam(s) has been investigated by several groups [43,[52][53][54][55][56][57]. For a parametric instability with "coherent" growth rate γ 0 and an incoherent pump laser with ∆ω 0 γ 0 , Pesme et al [43] use an "incoherent" growth rate γ inc = 4γ 2 0 /∆ω 0 .…”

Section: Introductionmentioning

confidence: 99%

Bandwidth effects in stimulated Brillouin scattering driven by partially incoherent light

Brandão,

Santos,

Trines

et al. 2021

Preprint

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A generalized Wigner-Moyal statistical theory of radiation is used to obtain a general dispersion relation for Stimulated Brillouin Scattering (SBS) driven by a broadband radiation field with arbitrary statistics. The monochromatic limit is recovered from our general result, reproducing the classic monochromatic dispersion relation. The behavior of the growth rate of the instability as a simultaneous function of the bandwidth of the pump wave, the intensity of the incident field and the wave number of the scattered wave is further explored by numerically solving the dispersion relation. Our results show that the growth rate of SBS can be reduced by 1/3 for a bandwidth of 0.3 nm, for typical experimental parameters.

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Mitigation of cross-beam energy transfer in inertial-confinement-fusion plasmas with enhanced laser bandwidth

Cited by 50 publications

References 61 publications

Direct drive with the argon fluoride laser as a path to high fusion gain with sub-megajoule laser energy

Direct drive with the argon fluoride laser as a path to high fusion gain with sub-megajoule laser energy

Direct-drive laser fusion: status, plans and future

Bandwidth effects in stimulated Brillouin scattering driven by partially incoherent light

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