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Development of Ta-based STJ X-ray Detector Arrays for Synchrotron Science

Carpenter, M. H. et al.

Journal of low temperature physics. VOL 176; NUMBER 3-4, ; 2014, 222-227 -- Springer Science + Business Media Part 3-4; (pages 222-227) -- 2014

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  • Title:
    Development of Ta-based STJ X-ray Detector Arrays for Synchrotron Science
  • Author: Carpenter, M. H.;
    Friedrich, S.;
    Hall, J. A.;
    Harris, J.;
    Cantor, R.
  • Found In: Journal of low temperature physics. VOL 176; NUMBER 3-4, ; 2014, 222-227
  • Journal Title: Journal of low temperature physics.
  • Subjects: Physics; LCC: QC278; Dewey: 536.56
  • Publication Details: Springer Science + Business Media
  • Language: English
  • Abstract: We are developing a cryogen-free Ta-based superconducting tunnel junction (STJ) detector for soft X-ray spectroscopy at synchrotrons. With an energy resolution 10 times higher than conventional solid-state X-ray detectors and count-rate capabilities above 5 kHz/pixel, STJ detectors offer potentially increased sensitivity for fluorescence-yield X-ray absorption spectroscopy (FY-XAS). We have developed 36-pixel arrays of 208 Formula Not Shown 208 Formula Not Shown m Ta STJs with an energy resolution of Formula Not Shown 9 eV FWHM at the 525 eV oxygen K line. Compared to earlier Nb-based STJs, Ta-STJs offer improved energy resolution and absorption efficiency and extend the operating range to several keV. Here we describe the integration of the 36-pixel arrays into a cryogen-free, user-friendly X-ray spectrometer. A computer-controlled adiabatic demagnetization refrigerator coupled to a two-stage pulse tube refrigerator allows operation below 100 mK. The detector chip is located at the end of a 42 cm shielded snout for insertion into the analysis chamber. The system is currently being commissioned at the Advanced Light Source synchrotron.
  • Identifier: Journal ISSN: 0022-2291
  • Publication Date: 2014
  • Physical Description: Physical
  • Accrual Information: Monthly
  • Shelfmark(s): 5010.570000
  • UIN: ETOCRN354941193

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