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We report a laser-driven neutron source with high yield ($>10^8$/J) and highpeak flux ($>10^{25}$/cm$^2$/s) derived from high-temperature deuteron-deuteronfusion reactions. The neutron yield and the fusion temperature ($\sim 200$ keV)in our experiment are respectively two orders of magnitude and one order ofmagnitude higher than any previous laser-induced D-D fusion reaction. Thehigh-temperature plasma is generated from thin ($\sim 2\,\mu$m), solid-densitydeuterium targets, produced by a cryogenic jet, irradiated by a 140 fs, 130 Jpetawatt laser with an F/3 off-axis parabola and a plasma mirror achieving fastvolumetric heating of the target. The fusion temperature and neutron fluxesachieved here suggest future laser experiments can take advantage of neutronsto diagnose the plasma conditions and come closer to laboratory study ofastrophysically-relevant nuclear physics.

Laser-driven neutron source from high temperature D-D fusion reactions