Oral Presentation

Optimized Frontend Components of the Prototype Ku-band Receiver for the COMAP-EoR Experiment

Author(s): MinSu Ko (KAIST), Wooseok Kang (KAIST), Junhan Kim (KAIST), Bangwon Lee (KASI), Kieran Cleary (Caltech), James Lamb (Owens Valley Radio Observatory), Jung-Won Lee (KASI), Jihoon Choi (KASI), and COMAP Collaboration

Presenter: MinSu Ko (Korea Advanced Institute of Science and Technology)

Carbon monoxide (CO) Mapping Array Project (COMAP) is a line intensity mapping survey aiming to measure the CO power spectrum at z > 2.4. COMAP-Epoch of Reionization (EoR) targets z=4.8-8.5, which corresponds to 12-20 GHz of the redshifted CO(J=1-0) line. Prior to constructing the full 19-pixel array COMAP-EoR receiver, we are developing a 4-pixel prototype receiver. Here, we present design studies for optimized frontend components of the instrument. A corrugated feedhorn has been optimized to have high return loss and beam patterns with small sidelobes while accommodating the optical configuration of the Taeduk Radio Astronomy Observatory's (TRAO) 13.7 m radio telescope, where the receiver will be deployed. A low-loss vacuum window incorporating an optimized waveguide choke is also described. Additionally, cryostat chamber design, a plan for the polarizer assembly, and target science cases are discussed.