Microwave Multiplexing on the Keck Array

A. Cukierman , Z. Ahmed , S. Henderson , E. Young , C. Yu , D. Barkats , D. Brown , S. Chaudhuri , J. Cornelison , J.M. d'Ewart , M. Dierickx , B.J. Dober , J. Dusatko , S. Fatigoni , J.P. Filippini , J.C. Frisch , G. Haller , M. Halpern , G.C. Hilton , J. Hubmayr , K.D. Irwin , K.S. Karkare , E. Karpel , S.A. Kernasovskiy , J.M. Kovac , A. Kovacs , S.E. Kuenstner , C.L. Kuo , D. Li , J.A.B. Mates , S. Smith , T. St. Germaine , J.N. Ullom , L.R. Vale , D.D. van Winkle , J. Vasquez , J. Willmert , L. Zeng , P.A.R. Ade , M. Amiri , R. Basu Thakur , C.A. Bischoff , J.J. Bock , H. Boenish , E. Bullock , V. Buza , J. Cheshire , J. Connors , M. Crumrine , L. Duband (1) , G. Hall , S. Harrison , S.R. Hildebrandt , H. Hui , J. Kang , S. Kefeli , K. Lau , K.G. Megerian , L. Moncelsi , T. Namikawa , H.T. Nguyen , R. O'Brient , S. Palladino , C. Pryke , B. Racine , C.D. Reintsema , S. Richter , A. Schillaci , R. Schwarz , C.D. Sheehy , A. Soliman , B. Steinbach , R.V. Sudiwala , K.L. Thompson , C. Tucker , A.D. Turner , C. Umiltà , A.G. Vieregg , A. Wandui , A.C. Weber , D.V. Wiebe , W.L.K. Wu , H. Yang , K.W. Yoon , C. Zhang

1 SBT - Service des Basses Températures

We describe an on-sky demonstration of a microwave-multiplexing readout system in one of the receivers of the Keck Array, a polarimetry experiment observing the cosmic microwave background at the South Pole. During the austral summer of 2018–2019, we replaced the time-division multiplexing readout system with microwave-multiplexing components including superconducting microwave resonators coupled to radio frequency superconducting quantum interference devices at the sub-Kelvin focal plane, coaxial-cable plumbing and amplification between room temperature and the cold stages, and a SLAC Microresonator Radio Frequency system for the warm electronics. In the range 5–6 GHz, a single coaxial cable reads out 528 channels. The readout system is coupled to transition-edge sensors, which are in turn coupled to 150-GHz slot-dipole phased-array antennas. Observations began in April 2019, and we report here on an initial characterization of the system performance.

Mots clés: Microwave multiplexing; BICEP; Keck Array; SMuRF; Tone tracking; CMB

Domaines: Instrumentations et Détecteurs [physics.ins-det]

A. Cukierman, Z. Ahmed, S. Henderson, E. Young, C. Yu, et al.. Microwave Multiplexing on the Keck Array. 18th International Workshop on Low Temperature Detectors, Jul 2019, Milano, Italy. pp.858-866, ⟨10.1007/s10909-019-02296-2⟩. ⟨hal-02614358⟩