MM radio telescope with focal plane array for 3 K SSF search

Spectral Spatial Fluctuations (SSF) of CMBR temperature must be a result of interaction of primordial molecules with CMBR and protoobjects moving with peculiar velocities relative to CMBR. Expected values of ΔT/T ∼10^-5-10^-6 and bandwidth of the lines is 0.1-3% depending on the scale of protoobjects and red shifts. It is proposed to use 2 m mm radio telescope of Tuorla Observatory, Finland (MSRT) for search of SSF in mm band. Characteristics of MSRT equipped by a chopper flat and 7×4 beam cryo-microbolometer array with RF multiplexer in the band of 88-100 GHz are described, ways to reduce instrumental effects are discussed. Expected ΔT/T is 2·10^-5 near NCP with 6´-7´ resolution of differential CMBR maps which may be used for SSF search at 1≤1000.