Uniform high spectral resolution demonstrated in arrays of TES x-ray microcalorimeters

Caroline A. Kilbourne, Simon R. Bandler, Ari D. Brown, James A. Chervenak, Enectali Figueroa-Feliciano, Fred M. Finkbeiner, Naoko Iyomoto, Richard L. Kelley, F. Scott Porter, Stephen J. Smith

Research output: Chapter in Book/Report/Conference proceedingConference contribution

17 Scopus citations

Abstract

Individual x-ray calorimeters based on superconducting transition-edge sensors (TES) have already demonstrated the spectral resolution, speed, and quantum efficiency needed for astrophysical x-ray spectroscopy. We are now beginning to realize this capability on the array scale for the first time. We have developed a new design for the x-ray absorber that has connections to the TES engineered to allow contact only in regions that do not serve as the active thermometer. We have further constrained the design so that a low-resistance absorber will not electrically short the TES, permitting the use of high-conductivity electroplated gold for the x-ray absorber. With such a well-behaved material for the absorber, we now achieve energy resolution at 6 keV in the range 2.4 -3.1 eV FWHM in all the pixels of the same design tested in a close-packed array. We have achieved somewhat higher resolution and faster response by eliminating some of the gold and electroplating bismuth in its place. These are important steps towards the high-resolution, high-fill-factor, microcalorimeter arrays needed for x-ray astrophysics observatories such as Constellation-X.

Original languageEnglish (US)
Title of host publicationUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV
DOIs
StatePublished - Dec 1 2007
EventUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV - San Diego, CA, United States
Duration: Aug 26 2007Aug 27 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6686
ISSN (Print)0277-786X

Other

OtherUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV
CountryUnited States
CitySan Diego, CA
Period8/26/078/27/07

Keywords

  • Constellation-X
  • Microcalorimeters
  • Transition-edge sensors

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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