Orateur
Description
Negative Ion Drift (NID) operation of gaseous TPCs represent a novel approach able to suppresses diffusion, enables precision tracking for rare-event searches and provide additional means for the measuremen of events position along the drift direction. We present the first observation of NID operation with alpha tracks in He–C4–SF6 mixtures at atmospheric pressure and detailed measurements at 650 mbar with the CYGNO/INITIUM 3D optical TPC approach, that combines GEM-based amplification with sCMOS camera and PMT optical readout. These measurements allowed us to characterise in details NID operation in noble gas mixtures, providing crucial inside that granted us the possibility to build a drift + amplification model extensively validated on data. These results establish a new experimental basis for understanding and exploiting NID operation, with applications ranging from directional dark matter detection to neutrino physics and X-ray polarimetry.
| Topic | Gas detectors |
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