CCAT-prime: Optical and cryogenic design of the 850 GHz module for Prime-Cam

TL;DR

This paper details the optical and cryogenic design of the 850 GHz module for Prime-Cam, a key instrument for the CCAT-prime telescope, focusing on optimizing optical parameters and cryogenic readout systems for a large array of detectors.

Contribution

It presents the first detailed optical and cryogenic design optimization for the 850 GHz module of Prime-Cam, enabling high-frequency observations with a large detector array.

Findings

Optimized optical design parameters for the 850 GHz module.

Developed cryogenic RF chain for over 30 readout lines.

Readout system supports 41,400 KIDs in cryogenic conditions.

Abstract

Prime-Cam is a first-generation instrument for the Cerro Chajnantor Atacama Telescope-prime (CCAT-prime) Facility. The 850$~$GHz module for Prime-Cam will probe the highest frequency of all the instrument modules. We describe the parameter space of the 850$~$GHz optical system between the F$\lambda$ spacing, beam size, pixel sensitivity, and detector count. We present the optimization of an optical design for the 850$~$GHz instrument module for CCAT-prime. We further describe the development of the cryogenic RF chain design to accommodate $>$30 readout lines to read 41,400 kinetic inductance detectors (KIDs) within the cryogenic testbed.