Suitability of Magnetic Microbolometers based on Paramagnetic Temperature Sensors for CMB Polarization Measurements
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS(2022)
摘要
High resolution maps of polarization anisotropies of the Cosmic Microwave
Background (CMB) are in high demand, since the discovery of primordial B-Modes
in the polarization patterns would confirm the inflationary phase of the
Universe that would have taken place before the last scattering of the CMB at
the recombination epoch. Transition Edge Sensors (TES) and Microwave Kinetic
Inductance Detectors (MKID) are the predominant detector technologies of
cryogenic detector array based CMB instruments that search for primordial
B-Modes. In this paper we propose another type of cryogenic detector to be used
for CMB survey: A magnetic microbolometer (MMB) that is based on a paramagnetic
temperature sensor. It is an adaption of state-of-the-art metallic magnetic
calorimeters (MMCs) that are meanwhile a key technology for high resolution
α, β, γ and X-ray spectroscopy as well as the study of
neutrino mass. The effort to adapt MMCs for CMB surveys is triggered by their
lack of Johnson noise associated with the detector readout, the possibility of
straightforward calibration and higher dynamic range given it possesses a broad
and smooth responsivity dependence with temperature and the absence of Joule
dissipation which simplifies the thermal design. A brief proof of concept case
study is analyzed, taking into account typical constraints in CMB measurements
and reliable microfabrication processes. The results show that MMBs provide a
promising technology for CMB polarization survey as their sensitivity can be
tuned for background limited detection of the sky while simultaneously
maintaining a low time response to avoid distortion of the point-source
response of the telescope. As the sensor technology and its fabrication
techniques are compatible with TES based bolometric detector arrays, a change
of detector technology would even come with very low cost.
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关键词
cryogenic bolometers,cosmic microwave background,primordial B-modes,metallic magnetic calorimeters,Monte-Carlo simulations
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