A study on the performance of half-wave plates designed for sub-mm studies

Braithwaite, Charlotte, Tucker, Carole ORCID: https://orcid.org/0000-0002-1851-3918, Calabrese, Erminia ORCID: https://orcid.org/0000-0003-0837-0068, Fabbian, Giulio ORCID: https://orcid.org/0000-0002-3255-4695, Giardiello, Serena, Pisano, Giampaolo ORCID: https://orcid.org/0000-0003-4302-5681, Savini, Giorgio, Vernet, Joël R., Bryant, Julia J. and Motohara, Kentaro 2024. A study on the performance of half-wave plates designed for sub-mm studies. Presented at: SPIE Astronomical Telescopes + Instrumentation, Yokohama, Japan, 15-20 June 2024. Proc. SPIE 13096: Ground-based and Airborne Instrumentation for Astronomy X. SPIE, 10.1117/12.3019262

Preview

PDF (Poster) - Presentation Download (1MB) | Preview

Abstract

A number of millimetre (mm) and sub-millimetre (sub-mm) instruments use half wave plates (HWP) as polarisation modulators, but a thorough account of the non-idealities arising in the HWP is crucial for the analysis of systematic errors. For Cosmic Microwave Background (CMB) experiments, studies propagating the measured spectral performance of a HWP through to scientific results, such as the tensor-to-scalar ratio, r, have not been conducted. Presented in this work is the measured spectral performance of an embedded metal mesh HWP designed for the NIKA2 experiment. The results were propagated through to calculate the bias on r introduced from it's non-idealities and a comparison between metal mesh and Pancharatnam type HWPs is conducted.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	SPIE
Date of Acceptance:	19 July 2024
Last Modified:	06 Sep 2024 11:15
URI:	https://orca.cardiff.ac.uk/id/eprint/171294

Actions (repository staff only)

Edit Item