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Direct searches for light dark matter particles (mass $<10$ GeV) areespecially challenging because of the low energies transferred in elasticscattering to typical heavy nuclear targets. We investigate the possibility ofusing liquid Helium-4 as a target material, taking advantage of the favorablekinematic matching of the Helium nucleus to light dark matter particles. MonteCarlo simulations are performed to calculate the charge, scintillation, andtriplet helium molecule signals produced by recoil He ions, for a variety ofenergies and electric fields. We show that excellent background rejection canbe achieved based on the ratios between different signal channels. We alsopresent some concepts for a liquid-helium-based dark matter detector. Key tothe proposed approach is the use of a large electric field to extract electronsfrom the event site, and the amplification of this charge signal, throughproportional scintillation, liquid electroluminescence, or roton emission. Thesensitivity of the proposed detector to light dark matter particles isestimated for various electric fields and light collection efficiencies.

A Concept for A Dark Matter Detector Using Liquid Helium-4