Microwave telescopes require an ever-increasing control of experimental systematics in their quest to measure the Cosmic Microwave Background (CMB) to exquisite levels of precision. One important systematic for ground and balloon-borne experiments is ground pickup, where beam sidelobes detect the thermal emission of the much warmer ground while the main beam is scanning the sky. This generates scan-synchronous noise in experiment timestreams, which is difficult to filter out without also deleting some of the signal from the sky. Therefore, efficient modelling of pickup can help guide the design of experiments and of analysis pipelines. In this work, we present an extension to the BEAMCONV algorithm that enables us to generate time-ordered data (TOD) from beam-convolved sky and ground maps simultaneously. We simulate ground pickup for both a ground-based experiment and a telescope attached to a stratospheric balloon. Ground templates for the balloon experiment are obtained by re-projecting satellite maps of the Earth's microwave emission.
|Title of host publication||Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI|
|Editors||Jonas Zmuidzinas, Jian-Rong Gao|
|Publication status||Published - 2022|
|Event||Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI 2022 - Montreal, Canada|
Duration: 17 Jul 2022 → 22 Jul 2022
|Name||Proceedings of SPIE - The International Society for Optical Engineering|
|Conference||Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI 2022|
|Period||17/07/22 → 22/07/22|
Bibliographical noteFunding Information:
The authors would like to thank Steven Benton, Kevin Crowley, Nadia Dachlythra and Reijo Keskitalo for productive discussions. Alexandre Adler’s participation to this SPIE conference is funded by the Birger and Gurli Grundströms research grant fund.
© 2022 SPIE.
- Beam convolution
- CMB Telescopes
- Cosmic Microwave Background
- Ground Pickup
- Scan-synchronous noise