Optical Characterization of the SPT-3G Focal Plane
Abstract
The third-generation South Pole Telescope camera is designed to measure the cosmic microwave background across three frequency bands (95, 150 and 220 GHz) with ~16,000 transition-edge sensor (TES) bolometers. Each multichroic pixel on a detector wafer has a broadband sinuous antenna that couples power to six TESs, one for each of the three observing bands and both polarization directions, via lumped element filters. Ten detector wafers populate the focal plane, which is coupled to the sky via a large-aperture optical system. Here we present the frequency band characterization with Fourier transform spectroscopy, measurements of optical time constants, beam properties, and optical and polarization efficiencies of the focal plane. The detectors have frequency bands consistent with our simulations, and have high average optical efficiency which is 86%, 77% and 66% for the 95, 150 and 220 GHz detectors. The time constants of the detectors are mostly between 0.5 ms and 5 ms. The beam is round with the correct size, and the polarization efficiency is more than 90% for most of the bolometers
Keywords
Cite
@article{arxiv.1805.03219,
title = {Optical Characterization of the SPT-3G Focal Plane},
author = {Zhaodi Pan and Peter Ade and Zeeshan Ahmed and Anderson Adam and Jason Austermann and Jessica Avva and Ritoban Basu Thakur and Bender Amy and Bradford Benson and John Carlstrom and Faustin Carter and Thomas Cecil and Clarence Chang and Jean-Francois Cliche and Ariel Cukierman and Edward Denison and Tijmen de Haan and Junjia Ding and Matt Dobbs and Daniel Dutcher and Wendeline Everett and Allen Foster and Renae Gannon and Adam Gilbert and John Groh and Nils Halverson and Angelina Harke-Horsemann and Nicholas Harrington and Jaosn Henning and Gene Hilton and William Holzapfel and Nicholas Huang and Kent Irwin and Oliver Jeong and Michalle Jonas and Trupti Khaire and Anna Kofman and Milo Korman and Donna Kubik and Steve Kuhlmann and Chaolin Kuo and Adrian Lee and Amy Lowitz and Stephan Meyer and Daniel Michalik and Joshua Montgomery and Andrew Nadolski and Tyler Natoli and Hogan Nguyen and Gavin Noble and Valentyn Novosad and Stephan Padin and John Pearson and Chrystian Posada and Alexandra Rahlin and John Ruhl and Lauren Saunders and James Sayre and Ian Shirley and Erik Shirokoff and Graeme Smecher and Joshua Sobrin and Antony Stark and Kyle Story and Aritoki Suzuki and Qingyang Tang and Keith Thompson and Carole Tucker and Leila Vale and Keith Vanderlinde and Joaquin Vieira and Gensheng Wang and Nathan Whitehorn and Volodymyr Yefremenko and Ki Won Yoon and Matt Young},
journal= {arXiv preprint arXiv:1805.03219},
year = {2018}
}
Comments
Conference proceeding for Low Temperature Detectors 2017