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StarDriver: an estimate of the bandwidth required to suppress the 2ωpe instability

David Eimerl, Andrew J Schmitt2016年Plasma Physics and Controlled FusionIF 2.2出版社

We report the first calculations of the 2ωpe instability in an IFE-scale corona of a direct drive target being driven by a StarDriver-class laser. Using realistic plasma profiles (density, temperature, flow velocity and Z) taken from full hydrodynamic simulations of the capsule implosion, we propagate the StarDriver beamlets to the ¼ critical surface using ray-tracing. We then use that 'k-space' of laser modes in a model of the absolute 2ωpe instability in the inhomogeneous plasma at ¼ critical density. Our calculations indicate that 15–20 THz of bandwidth at 351 nm wavelength (about 2% bandwidth) significantly reduces or suppresses the absolute instability at most times in the drive pulse. A bandwidth of 35 THz suppresses it at all times in the drive pulse. We note that 2% bandwidth ~20 THz is achievable using laser gain media available today.

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