Abstract
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 language | English (US) |
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Article number | 9380315 |
Journal | IEEE Transactions on Applied Superconductivity |
Volume | 31 |
Issue number | 5 |
DOIs | |
State | Published - Aug 2021 |
Keywords
- 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