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

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.

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Correspondence to E. Figueroa-Feliciano.

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Figueroa-Feliciano, E., Saab, T., Rivera-Ortiz, P.M. et al. Studies of Thermal Diffusion in Planar Absorber Designs for the Micro-X Rocket. J Low Temp Phys 151, 424–429 (2008). https://doi.org/10.1007/s10909-007-9667-4

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Keywords

  • TES
  • Microcalorimeter
  • Micro-X
  • Diffusion
  • Position dependence

PACS

  • 66.30.Xj
  • 95.55.Ka