For a He:CF4 optical TPC, an extra electrode below the last GEM doubles the light yield, and 1.6% SF6 enables negative-ion drift with diffusion as low as 45 µm/√cm.
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Optimisation of amplification and gas mixture for directional Dark Matter searches with the CYGNO/INITIUM project
For a He:CF4 optical TPC, an extra electrode below the last GEM doubles the light yield, and 1.6% SF6 enables negative-ion drift with diffusion as low as 45 µm/√cm.