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Title: Sidelobe modeling and mitigation for a three mirror anastigmat cosmic microwave background telescope

Journal Article · · Applied Optics
DOI: https://doi.org/10.1364/ao.488454 · OSTI ID:1959818
 [1];  [2];  [3];  [1];  [4];  [5];  [6];  [1];  [7];  [2];  [7]; ORCiD logo [7];  [6];  [8];  [1];  [9];  [1]; ORCiD logo [10];  [11]
  1. Case Western Reserve Univ., Cleveland, OH (United States)
  2. Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
  3. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  4. Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP); Argonne National Laboratory (ANL), Argonne, IL (United States)
  5. Univ. of Arizona, Tucson, AZ (United States)
  6. Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP)
  7. Washington Univ., St. Louis, MO (United States)
  8. Cornell Univ., Ithaca, NY (United States)
  9. California Institute of Technology (CalTech), Pasadena, CA (United States)
  10. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  11. Univ. of Chicago, IL (United States)
+ Show Author Affiliations

Telescopes measuring cosmic microwave background (CMB) polarization on large angular scales require exquisite control of systematic errors to ensure the fidelity of the cosmological results. In particular, far-sidelobe contamination from wide angle scattering is a potentially prominent source of systematic error for large aperture microwave telescopes. Here we describe and demonstrate a ray-tracing-based modeling technique to predict far sidelobes for a three mirror anastigmat telescope designed to observe the CMB from the South Pole. Those sidelobes are produced by light scattered in the receiver optics subsequently interacting with the walls of the surrounding telescope enclosure. After comparing simulated sidelobe maps and angular power spectra for different enclosure wall treatments, we propose a highly scattering surface that would provide more than an order of magnitude reduction in the degree-scale far-sidelobe contrast compared to a typical reflective surface. We conclude by discussing the fabrication of a prototype scattering wall panel and presenting measurements of its angular scattering profile.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); USDOE
Grant/Contract Number:
AC02-07CH11359; 1935892; SC0017987; SC0021434
OSTI ID:
1959818
Alternate ID(s):
OSTI ID: 1975292
Report Number(s):
FERMILAB-PUB-23-092-PPD; arXiv:2302.10971; oai:inspirehep.net:2635628; TRN: US2312917
Journal Information:
Applied Optics, Vol. 62, Issue 16; ISSN 1559-128X
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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