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A methodology to measure Near Infrared (NIR) scintillations in gaseous andliquid Ar, using Geiger-mode APDs (GAPDs) sensitive in the NIR and pulsed X-rayirradiation, is described. This study has been triggered by the development ofCryogenic Avalanche Detectors (CRADs) with optical readout in the NIR usingcombined THGEM/GAPD multiplier, which may come to be in demand in coherentneutrino-nucleus scattering and dark matter search experiments. A new approachto measure the NIR scintillation yield at cryogenic temperatures has beendeveloped, namely using GAPDs in single photoelectron counting mode with timeresolution. The time structure of NIR scintillations and their light yield weremeasured both for primary scintillations and that of secondary at moderateelectric fields (electroluminescence), in gaseous and liquid Ar.

Study of infrared scintillations in gaseous and liquid argon - Part I: methodology and time measurements