Article

Journal of Low Temperature Physics

, Volume 151, Issue 1, pp 424-429

Studies of Thermal Diffusion in Planar Absorber Designs for the Micro-X Rocket

  • E. Figueroa-FelicianoAffiliated withDepartment of Physics, Massachusetts Institute of Technology Email author 
  • , T. SaabAffiliated withDepartment of Physics, University of Florida
  • , P. M. Rivera-OrtizAffiliated withDepartment of Mechanical Engineering, University of Puerto Rico
  • , S. R. BandlerAffiliated withX-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center
  • , N. IyomotoAffiliated withX-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center
  • , R. L. KelleyAffiliated withX-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center
  • , C. A. KilbourneAffiliated withX-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center
  • , F. S. PorterAffiliated withX-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center
  • , S. J. SmithAffiliated withX-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center

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Abstract

We have studied a potential design for a transition-edge sensor (TES) microcalorimeter array for the Micro-X High Resolution Microcalorimeter X-ray Imaging Rocket. Diffusion simulations of a design that places a small TES in the center of the pixel with a large in-plane absorber around the TES demonstrate that with high-quality gold films (RRR >6) 2 eV resolution is attainable in a 700 μm pixel, meeting the Micro-X requirement. X-ray hits directly on the TES, however, create a non-gaussian high energy tail to the device response. This high energy tail contains 5% of incident photons and cannot be removed by lowering the optimal filter bandwidth.

Keywords

TES Microcalorimeter Micro-X Diffusion Position dependence

PACS

66.30.Xj 95.55.Ka