Back to Search
Start Over
Current dependence of performance of TES microcalorimeters and characteristics of excess noise
- Source :
-
Nuclear Instruments & Methods in Physics Research Section A . Mar2004, Vol. 520 Issue 1-3, p340. 4p. - Publication Year :
- 2004
-
Abstract
- We are developing transition edge sensor (TES) microcalorimeter arrays for future Japanese astronomy missions. Although <f>6.6 eV</f> energy resolution for <f>5.9 keV</f> and <f>74 μs</f> decay time are achieved, our energy resolution was limited by the excess noise of unknown origin. The dominant noise showed <f>1/R</f> dependence and it only appeared when the current through the TES, <f>I</f>, is larger than <f>10 μA</f>. This is explained if we assume a constant voltage noise source with a level of <f>∼2(4kTCRn)1/2</f>. We also investigated the influence of <f>I</f> on the TES performance and found the TES sensitivity <f>α</f> is reduced when the ratio of current to the critical current <f>I/IC</f> is large. It can explain the reduction of <f>α</f> observed when operated without a magnetic shield. We also found a strong correlation between <f>IC</f> and <f>α</f> or the baseline width. Thus, we conclude that <f>IC</f> is an essential parameter for the TES performance. [Copyright &y& Elsevier]
- Subjects :
- *CALORIMETERS
*NOISE control
*DETECTORS
Subjects
Details
- Language :
- English
- ISSN :
- 01689002
- Volume :
- 520
- Issue :
- 1-3
- Database :
- Academic Search Index
- Journal :
- Nuclear Instruments & Methods in Physics Research Section A
- Publication Type :
- Academic Journal
- Accession number :
- 12575038
- Full Text :
- https://doi.org/10.1016/j.nima.2003.11.262