A Study of the Operation of Especially Designed Photosensitive Gaseous   Detectors at Cryogenic Temperatures
  In some experiments and applications there is need for large-area photosensitive detectors to operate at cryogenic temperatures. Nowadays, vacuum PMs are usually used for this purpose. We have developed special designs of planar photosensitive gaseous detectors able to operate at cryogenic temperatures. Such detectors are much cheaper PMs and are almost insensitive to magnetic fields. Results of systematic measurements of their quantum efficiencies, the maximum achievable gains and long-term stabilities will be presented. The successful operation of these detectors open realistic possibilities in replacing PMs by photosensitive gaseous detectors in some applications dealing with cryogenic liquids; for example in experiments using noble liquid TPCs or noble liquid scintillating calorimeters. 
L. Periale, V. Peskov, C. Iacobaeus, B. Lund-Jensen, P. Pavlopoulos,   P. Picchi, F. Pietropaolo