Stability of Al-Mn Transition Edge Sensors for Frequency Domain Multiplexing

Author

Hubmayr, J. ; Austermann, J.E. ; Beall, J.A. ; Becker, D. ; Bennett, D.A. ; Benson, B.A. ; Bleem, L.E. ; Chang, C.L. ; Carlstrom, J.E. ; Cho, H.-M. ; Crites, A.T. ; Dobbs, M. ; Everett, W. ; George, E.M. ; Holzapfel, W.L. ; Halverson, N.W. ; Henning, J.W.

Author_Institution

NIST Quantum Devices Group, Boulder, CO, USA

Volume

21

Issue

3

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

203

Lastpage

206

Abstract

We are developing arrays of 150 GHz transition edge sensor (TES) polarimeters for the South Pole Telescope polarimeter (SPTpol). Prototype devices use an aluminum manganese (Al-Mn) alloy TES with a normal resistance R_n suited to frequency domain multiplexing (fMUX) used in SPTpol. Using the fMUX readout, the devices exhibit noise performance consistent with expectations when R >; 0.8R_n. Below 0.8R_n, the detectors have high loopgain and become unstable, which is predicted by use of a compound TES model. We address this issue in a recent fabrication with increased TES heat capacity and normal metal structures on the TES to tune the temperature sensitivity.

Keywords

aluminium alloys; manganese alloys; multiplexing; polarimeters; Al-Mn transition edge sensors; aluminum manganese alloy TES; frequency domain multiplexing; south pole telescope polarimeter; stability; transition edge sensor polarimeters; Current measurement; Heating; Integrated circuit modeling; Multiplexing; Sensors; Temperature measurement; Thermal stability; AlMn; CMB; polarimeter; transition edge sensor;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2010.2090630

Filename

5654545