Kavli Affiliate: Zeeshan Ahmed
| First 5 Authors: Thomas P. Satterthwaite, Thomas P. Satterthwaite, , ,
| Summary:
Fulfilling the science goals of the Simons Observatory, a state-of-the-art
cosmic microwave background (CMB) experiment, has required deploying tens of
thousands of superconducting bolometers. Reading out data from the
observatory’s more than 67,000 transition-edge sensor (TES) detectors while
maintaining cryogenic conditions requires an effective multiplexing scheme. The
SLAC microresonator radio frequency (SMuRF) electronics have been developed to
provide the warm electronics for a high-density microwave frequency
multiplexing readout system, and this system has been shown to achieve
multiplexing factors on the order of 1,000. SMuRF has recently been deployed to
the Simons Observatory, which is located at 5,200 m on Cerro Toco in Chile’s
Atacama Desert. As the SMuRF system is exposed to the desert’s diurnal
temperature swings, resulting phase drift in RF transmission lines may
introduce a systematic signal contamination. We present studies of phase drift
in the room-temperature RF lines of the Simons Observatory’s 6 m large-aperture
telescope, which hosts the largest deployment to date of TES microwave
frequency multiplexing to a single telescope. We show that these phase drifts
occur on time scales which are significantly longer than sky scanning, and that
their contribution to on-sky in-transition detector noise is within the readout
noise budget.
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