Title :
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
fDate :
6/1/2011 12:00:00 AM
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 Rn suited to frequency domain multiplexing (fMUX) used in SPTpol. Using the fMUX readout, the devices exhibit noise performance consistent with expectations when R >; 0.8Rn. Below 0.8Rn, 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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2010.2090630
