In this paper, we introduce the receiver architecture for the Black Hole Explorer (BHEX) Mission, designed to reveal the photon ring of black holes. The primary instrument is a dual-polarization receiver operating over the 240-320 GHz frequency range, utilizing a Superconductor-Insulator-Superconductor (SIS) mixer. This Double-Side-Band (DSB) receiver has an intermediate frequency (IF) range of 4-12 GHz and operates at a bath temperature of 4.5 K, for optimal performance, which necessitates the integration of a cryocooler. Complementing the primary receiver is a secondary unit covering the 80-106 GHz spectrum, featuring a cryogenic low noise amplifier. This secondary receiver, affixed to the 20 K stage of the cryocooler, serves to augment the SIS receiver performance by employing the Frequency Phase Transfer technique to boost the signal-to-noise ratio at the correlator output. Together, this sophisticated receiver duo is engineered to achieve the quantum-limited sensitivity required to detect the photon ring of black holes, marking a breakthrough in astrophysical observation.
@article{arxiv.2406.09558,
title = {Receivers for the Black Hole Explorer (BHEX) Mission},
author = {C. Edward Tong and Kazunori Akiyama and Paul Grimes and Mareki Honma and Janice Houston and Michael D. Johnson and Daniel P. Marrone and Hannah Rana and Yoshinori Uzawa},
journal= {arXiv preprint arXiv:2406.09558},
year = {2024}
}
Comments
To be presented at the SPIE Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Waves, June 2024, Yokohama, Japan