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Optical recording of avalanche-induced photons is an interesting tool forstudying basic physics processes in gaseous detectors. In this work wedemonstrate the potential of optical readout in avalanche-propagationinvestigations in Thick Gas Electron Multipliers (THGEMs) operated with Ne/CF4(95/5). We present the results of direct measurements, with single- andcascaded-THGEM detectors irradiated with soft x-rays, of the hole-multiplicityand avalanche asymmetry within holes, as a function of detector parameters.Further study directions are discussed.

Optical readout: a tool for studying gas-avalanche processes