Laboratory Integration of the AliCPT-1 Receiver

Maria Salatino, Matthew O. Withers, Chao Lin Kuo, Keith L. Thompson, Jason Austermann, John C. Groh, Ethan D. Karpel, Philip Mauskopf, Jeremy Meinke, Jordi A. Montana-Lopez, Chase Russell Parker, Cody Roberson, Eric Weeks, Xinmin Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

Ali Cosmic Microwave Background (CMB) Polarization Telescope (AliCPT-1) will be the first large-scale microwave focal plane polarimeter, with <inline-formula><tex-math notation="LaTeX">$&gt;10^{4}$</tex-math></inline-formula> detectors, dedicated to ground-based CMB observations in the Northern Hemisphere. The observatory is on the Tibetan plateau. AliCPT-1 will observe the sky with polarization sensitive Transition-Edge Sensors (TESes) in two frequency bands centered at 90 and 150&#x00A0;GHz. A 72&#x00A0;cm aperture refracting cryogenic telescope, cooled down to 4&#x00A0;K, will focus the sky radiation on a focal plane unit designed to host up to 32,376 detectors in 19 detector modules cooled down to 280mK. The TESes will be read out with a microwave multiplexing architecture with a multiplexing factor up to 1,820 and a RFSoC-based room temperature readout electronics. The first detector and cryogenic multiplexer unit have been separately assembled and characterized under dark conditions. The cryostat has been successfully characterized at cryogenic temperatures, and the basic operation of the warm RFSoC system for a single detector unit has been demonstrated. Here we present the performance of the receiver before the integration of the first detector module. AliCPT-1 is a unique and powerful degree-scale CMB experiment through its combination of a unique site, large focal plane, and new enabling readout technologies.

Original languageEnglish (US)
Pages (from-to)1-4
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
DOIs
StateAccepted/In press - 2023
Externally publishedYes

Keywords

  • Cosmic Microwave Background
  • Cryogenics
  • Cryogenics
  • Detectors
  • Electromagnetic heating
  • Microwave filters
  • Microwave measurement
  • Microwave Multiplexing Readout
  • Multiplexing
  • Thermal loading
  • Tibet
  • Transition-Edge Sensor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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