Study of two-phase cryogenic avalanche detectors based on GEMs at Novosibirsk

Remarkable features of gas electron multipliers (GEM) make them attractive 
for numerous applications in high-energy physics, nuclear physics,
astrophysics, and the medical-imaging field. This talk presents the 
results of research and development of GEM-based radiation detectors at 
BINP, Novosibirsk. These studies include the GEM operation in pure noble 
gases at high pressures and cryogenic temperatures, as well as in 
two-phase (gas-liquid) mode. First results on development of GEM-based gas 
photo-detectors at cryogenic temperatures will be discussed.