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Microwave SQUID Multiplexer Demonstration for Cosmic Microwave Background Imagers.

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|January 17, 2018
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Summary
This summary is machine-generated.

The microwave SQUID multiplexer (µmux) offers a low-noise readout for transition edge sensor (TES) bolometers used in cosmic microwave background (CMB) observations. This technology enables sensitive CMB mapping for inflation studies with minimal cross-talk.

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Area of Science:

  • Astrophysics and Cosmology
  • Instrumentational Physics

Background:

  • Cosmic Microwave Background (CMB) observations require highly sensitive detectors like transition edge sensor (TES) bolometers.
  • Efficient readout systems are crucial for maximizing the data quality and sensitivity of CMB instruments.

Purpose of the Study:

  • To demonstrate the performance of the microwave SQUID multiplexer (µmux) coupled to TES bolometers for CMB observations.
  • To evaluate the noise characteristics, frequency response, and cross-talk of the µmux readout system.

Main Methods:

  • A 64-channel demonstration of the µmux coupled to TES bolometers optimized for CMB observations.
  • Measurement of input-referred current noise levels at specific microwave probe tone power.
  • Assessment of noise performance under negligible photon loading and bias conditions.
  • Analysis of power spectral density and cross-talk between channels.

Main Results:

  • Achieved a white, input-referred current noise level of [Formula: see text] at -77 dB microwave probe tone power, below expected noise sources.
  • Measured noise consistent with bolometer thermal fluctuation noise ([Formula: see text]) under low photon loading.
  • Demonstrated white power spectral density down to ~100 mHz, suitable for large-scale CMB mapping.
  • Reported cross-talk below 0.3%, outperforming existing multiplexed readout systems.

Conclusions:

  • The µmux is a viable and high-performance readout technique for TES bolometers in CMB experiments.
  • The demonstrated low noise and minimal cross-talk are critical for future CMB imaging instruments.
  • This technology facilitates precise CMB mapping for constraining cosmological parameters, including the physics of inflation.