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.
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D. Vaccaro, D. Vaccaro, A. M. Baldini, A. M. Baldini, F. Cei, F. Cei, L. Galli, L. Galli, G. Gallucci, G. Gallucci, M. Grassi, M. Grassi, A. Iezzi, A. Iezzi, M. Incagli, M. Incagli, D. Nicolò, D. Nicolò, F. Spinella, F. Spinella, M. Venturini, M. Venturini, Y. Venturini, Y. Venturini, G. Signorelli, 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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