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Proceedings Paper

Development of arrays of position-sensitive microcalorimeters for Constellation-X
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Paper Abstract

We are developing arrays of position-sensitive transition-edge sensor (PoST) X-ray detectors for future astronomy missions such as NASA's Constellation-X. The PoST consists of multiple absorbers thermally coupled to one or more transition-edge sensor (TES). Each absorber element has a different thermal coupling to the TES. This results in a distribution of different pulse shapes and enables position discrimination between the absorber elements. PoST's are motivated by the desire to achieve the largest possible focal plane area with the fewest number of readout channels and are ideally suited to increasing the Constellation-X focal plane area, without comprising on spatial sampling. Optimizing the performance of PoST's requires careful design of key parameters such as the thermal conductances between the absorbers, TES and the heat sink, as well as the absorber heat capacities. Our new generation of PoST's utilizes technology successfully developed on high resolution (~ 2.5 eV) single pixels arrays of Mo/Au TESs, also under development for Constellation-X. This includes noise mitigation features on the TES and low resistivity electroplated absorbers. We report on the first experimental results from new one-channel, four-pixel, PoST's or 'Hydras', consisting of composite Au/Bi absorbers. We have achieved full-width-at-half-maximum energy resolution of between 5-6 eV on all four Hydra pixels with an exponential decay time constant of 620 μs. Straightforward position discrimination by means of rise time is also demonstrated.

Paper Details

Date Published: 15 July 2008
PDF: 8 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 701126 (15 July 2008); doi: 10.1117/12.790100
Show Author Affiliations
Stephen J. Smith, NASA Goddard Space Flight Ctr. (United States)
Simon R. Bandler, NASA Goddard Space Flight Ctr. (United States)
CRESST and Univ. of Maryland (United States)
Regis P. Brekosky, NASA Goddard Space Flight Ctr. (United States)
Northrop Grumman Corp. (United States)
Ari-D. Brown, NASA Goddard Space Flight Ctr. (United States)
James A. Chervenak, NASA Goddard Space Flight Ctr. (United States)
Megan E. Eckart, NASA Goddard Space Flight Ctr. (United States)
Enectali Figueroa-Feliciano, Massachusetts Institute of Technology (United States)
Fred M. Finkbeiner, NASA Goddard Space Flight Ctr. (United States)
Wyle Information Systems (United States)
Richard L. Kelley, NASA Goddard Space Flight Ctr. (United States)
Caroline A. Kilbourne, NASA Goddard Space Flight Ctr. (United States)
F. Scott Porter, NASA Goddard Space Flight Ctr. (United States)
John E Sadleir, NASA Goddard Space Flight Ctr. (United States)
Univ. of Illinois Urbana-Champaign (United States)


Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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