Current Status of the Ali CMB Polarization Telescope Focal Plane Camera

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

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


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 passband performance within 2.5% of design and cross-polarization systematic sensitivity leq2%.

Original languageEnglish (US)
Article number9380315
JournalIEEE Transactions on Applied Superconductivity
Issue number5
StatePublished - Aug 2021


  • B-modes
  • Cosmic Microwave Background
  • Tibet
  • cryogenics
  • kilopixel focal planes
  • low noise amplifier
  • microwave multiplexing readout
  • radio frequency system-on-chip
  • transition-edge sensor

ASJC Scopus subject areas

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


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