Аннотация:The problem of improve sensitivity of the opto-acoustical gravitational wave antenna OGRAN
installed in the in the BNO RAS underground is discussed. Numerical calculations of the expected
sensitivity gain due to a moderate cooling of the opto-acoustical GW detector are carried out. Design
of modernized construction for cryogenic OGRAN is presented and experiment with cooled pilot
model having the cryogenic mirrors is described.