# 18th International Workshop on Low Temperature Detectors (LTD-18)

22-26 July 2019
Milano
Europe/Rome timezone

## Design of a testbed for the study of system interference in space CMB polarimetry

23 Jul 2019, 17:45
1h 15m
Piazza Città di Lombardia (Milano)

### Piazza Città di Lombardia

#### Milano

Piazza Città di Lombardia, 1, 20124 Milano MI
Poster Detector readout, signal processing, and related technologies

### Speaker

Tommaso Ghigna (University of Oxford)

### Description

LiteBIRD is a proposed JAXA satellite mission to measure the CMB B-mode polarization with unprecedented sensitivity ($\sigma_r \sim 0.001$). To achieve this goal, $\sim 4000$ state-of-the-art TES bolometers will observe the whole sky for 3 years from L2. These detectors, as well as the SQUID readout, are extremely susceptible to EMI and other instrumental disturbances e.g. static magnetic field and vibration. As a result, careful analysis of the interference between the detector system and the rest of the telescope instruments is essential. This study in an early phase of the project is particularly important in order to reduce risks and do a sanity-check before final assembly of the whole instrument. We report a plan for the preparation of a cryogenic testbed to study the interaction between the detectors and other subsystems, especially a polarization modulator unit consisting of a magnetically-rotating half wave plate. We also present the requirements, current status and preliminary results.

Less than 5 years of experience since completion of Ph.D Y Y

### Primary author

Tommaso Ghigna (University of Oxford)

### Co-authors

Tomotake Matsumura (Kavli IPMU, The University of Tokyo) Masashi Hazumi (KEK, Tsukuba) Samantha Stever (Kavli IPMU, University of Tokyo) Yuki Sakurai (Kavli IPMU, The University of Tokyo) Nobuhiko Katayama (Kavli IPMU) Aritoki Suzuki (Lawrence Berkeley National Laboratory) Benjamin Westbrook (1985) Prof. Adrian T. Lee (University of California, Berkeley)