19 July 2016 The FDM readout system for the TES bolometers of the SWIPE instrument on the balloon-borne LSPE experiment
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Abstract
We present the design and first tests of a prototype readout for the SWIPE instrument onboard the LSPE balloon-borne experiment. LSPE aims at measuring the linear polarization of the Cosmic Microwave Background (CMB) at large angular scales, to find the imprint of inflation on the B-mode CMB polarization. The SWIPE instrument hosts two focal planes hosting 163 TES Au/Mo spiderweb bolometers each, cooled at 0.3 K for the detection of microwave frequencies of 140, 220 and 240 GHz.

To read all the detectors, a 16 channel frequency domain multiplexing readout system has been devised, consisting of LC resonators composed of custom Nb superconducting inductors and commercial SMD capacitors.

A set-up consisting of 14 LC resonators shows that we can accommodate 16 channels in the frequency range between 200 kHz and 1.6 MHz, since the necessary line-widths can be achieved. A preliminary firmware for the generation and read-out of the biasing frequency comb is also discussed.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. Vaccaro, A. M. Baldini, F. Cei, L. Galli, G. Gallucci, M. Grassi, A. Iezzi, M. Incagli, D. Nicolò, F. Spinella, M. Venturini, Y. Venturini, G. Signorelli, "The FDM readout system for the TES bolometers of the SWIPE instrument on the balloon-borne LSPE experiment", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99143C (19 July 2016); doi: 10.1117/12.2232186; https://doi.org/10.1117/12.2232186
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