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Polarized fusion has long ago be proposed as a method to strongly increasethe efficiency of fusion reactors. However, the required nuclearspin-polarization conservation in fusion plasmas has never been provenexperimentally. Here we report on first experimental data suggesting anincreased ion flux from a polarized $^3\mkern-1mu$He target heated by a PWlaser pulse as well as evidence for an almost complete persistence of theirnuclear-polarization after acceleration to MeV energies. These findings alsovalidate the concept of using pre-polarized targets for plasma acceleration ofpolarized beams.

First evidence of nuclear polarization effects in a laser-induced $^3\mkern-1mu$He fusion plasma