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Characterization and reduction of noise in Mo/Au transition edge sensors |
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| Authors: | Mark A. Lindeman Simon Bandler Regis P. Brekosky James A. Chervenak Enectali Figueroa-Feliciano Fred M. Finkbeiner Tarek Saab Caroline K. Stahle |
| Affiliation: | a NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA b Department of Astronomy, University of Maryland, Greenbelt, MD 20771, USA |
| Abstract: | We measured noise in a variety of Mo/Au transition-edge sensor (TES) X-ray calorimeters. We investigated the relationship between the noise, bias, and the superconducting phase transition in the TESs. Our square TES calorimeters have achieved very good energy resolutions (2.4 eV at 1.5 keV) but their resolutions have been limited by broadband white excess noise generated by the TES when it is biased in the phase transition. We have recently fabricated Mo/Cu TESs with interdigitated normal metal bars deposited on top of the bilayer. The new TES calorimeters have demonstrated little or no excess noise in the phase transition. These results point the way to development of TES calorimeters with higher energy resolution. |
| Keywords: | Author Keywords: Transition edge sensor Reduced excess noise Calorimeter Molydenum Gold Bilayer |
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