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

By: Hubmayr, J.; Austermann, J.E.; Young, E.Y.; Yoon, K.W.; Simon, S.M.; Shirokoff, E.; Schmidt, D.R.; Niemack, M.D.; Nibarger, J.P.; Meyer, S.S.; Mehl, J.; McMahon, J.; Lueker, M.; Lowell, P.; Li, D.; Irwin, K.D.; Hilton, G.C.; Henning, J.W.; Halverson, N.W.; Holzapfel, W.L.; George, E.M.; Everett, W.; Dobbs, M.; Crites, A.T.; Cho, H.; Carlstrom, J.E.; Beall, J.A.; Becker, D.; Bennett, D.A.; Benson, B.A.; Bleem, L.E.; Chang, C.L.;

2011 / IEEE

Description

This item was taken from the IEEE Periodical ' Stability of Al-Mn Transition Edge Sensors for Frequency Domain Multiplexing ' 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.