Current status of the Ali CMB Polarization Telescope focal plane camera

Maria Salatino, Jason Austermann, Jeremy Meinke, Adrian Sinclair, Samantha Walker, Xiran Bai, James Beall, Jake Connors, Bradley Dober, Shannon Duff, Richard Givhan, Gene C. Hilton, Johannes Hubmayr, Ethan Karpel, Chao Lin Kuo, Hamdi Mani, John Arthur Benson Mates, Justin Mathewson, Philip Mauskopf, Jordi Montana-LopezRyan Stephenson, Keith L. Thompson, Joel Ullom, Jeff Van Lanen, Ki Won Yoon, Eric Weeks, Yi Han Wu, Xinmin Zhang

Research output: Contribution to journalArticlepeer-review


Ali CMB Polarization Telescope (AliCPT) is the first Cosmic Microwave Background (CMB) polarimeter with a large focal plane camera to be deployed in the Northern Hemisphere, in the Tibetan Plateau. Here we present the design of a dichroic (90/150 GHz) focal plane camera capable of hosting up to 32,376 transition-edge sensor (TES) bolometers operating from a base temperature of 280 mK. Detectors are fabricated as monolithic arrays of 1,704 feedhorn-coupled and polarization-sensitive TES bolometers that are packaged in independent modules and read out with a microwave multiplexing architecture. A custom RFSoC-based system manages the multiplexing readout. Prototype AliCPT pixels have been fabricated and characterized, demonstrating pass-band performance within 2.5% of design and cross-polarization systematic sensitivity 2%.

Original languageEnglish (US)
JournalIEEE Transactions on Applied Superconductivity
StateAccepted/In press - 2021


  • B-modes
  • Bolometers
  • Cosmic Microwave Background
  • Cryogenics
  • Detectors
  • Kilopixel focal planes
  • Low noise amplifier
  • Microwave multiplexing readout
  • Optical device fabrication
  • Optical polarization
  • Optical resonators
  • Prototypes
  • Radio Frequency System-on-Chip
  • Resonators
  • Tibet
  • Transition-edge sensor

ASJC Scopus subject areas

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

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