Testing magnetic interference between TES detectors and the telescope environment for future CMB satellite missions
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI(2022)
Abstract
The two most common components of several upcoming CMB experiments are large
arrays of superconductive TES (Transition-Edge Sensor) detectors and
polarization modulator units, e.g. continuously-rotating Half-Wave Plates
(HWP). A high detector count is necessary to increase the instrument raw
sensitivity, however past experiments have shown that systematic effects are
becoming one of the main limiting factors to reach the sensitivity required to
detect primordial B-modes. Therefore, polarization modulators have become
popular in recent years to mitigate several systematic effects. Polarization
modulators based on HWP technologies require a rotating mechanism to spin the
plate and modulate the incoming polarized signal. In order to minimize heat
dissipation from the rotating mechanism, which is a stringent requirement
particularly for a space mission like LiteBIRD, we can employ a
superconductive magnetic bearing to levitate the rotor and achieve contactless
rotation. A disadvantage of this technique is the associated magnetic fields
generated by those systems. In this paper we investigate the effects on a TES
detector prototype and find no detectable T_c variations due to an applied
constant (DC) magnetic field, and a non-zero TES response to varying (AC)
magnetic fields. We quantify a worst-case TES responsivity to the applied AC
magnetic field of ∼10^5 pA/G, and give a preliminary interpretation of the
pick-up mechanism.
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Key words
CMB,Bolometer,Transition Edge Sensor,Polarization Modulator,Half-Wave Plate
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