  There are several proposals and projects today for building LXe Time
Projection Chambers (TPCs) for dark matter search. An important element of
these TPCs are the photomultipliers operating either inside LXe or in vapors
above the liquid.
  We have recently demonstrated that photosensitive gaseous detectors (wire
type and hole-type) can operate perfectly well until temperatures of LN2. In
this paper results of systematic studies of operation of the photosensitive
version of these detectors (combined with reflective or semi-transparent CsI
photocathodes) in the temperature interval of 300-150 K are presented. In
particular, it was demonstrated that both sealed and flushed by a gas detectors
could operate at a quite stable fashion in a year/time scale. Obtained results,
in particular the long-term stability of photosensitive gaseous detectors,
strongly indicate that they can be cheap and simple alternatives to
photomultipliers or avalanche solid-state detectors in LXe TPC applications.
