Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640518b&link_type=abstract
American Astronomical Society, AAS Meeting #216, #405.18; Bulletin of the American Astronomical Society, Vol. 41, p.891
Astronomy and Astrophysics
Astrophysics
Scientific paper
High spectral resolution, high cadence, imaging x-ray spectroscopy has the potential to revolutionize the study of the solar corona. To that end we have been developing transition-edge-sensor (TES) based x-ray microcalorimeter arrays for future solar physics missions where imaging and high energy resolution spectroscopy will enable previously impossible studies of the dynamics and energetics of the solar corona. The characteristics of these x-ray microcalorimeters are significantly different from conventional microcalorimeters developed for astrophysics because they need to accommodate much higher count rates ( 300-1000 cps) while maintaining high energy resolution of less than 4 eV FWHM in the X-ray energy band of 0.2-10 keV. The other main difference is a smaller pixel size (less than 75 microns) than is typical for x-ray microcalorimeters in order to provide angular resolution of less than 1 arcsecond. We have achieved at energy resolution of 2.13 eV FWHM at 6 keV in a pixel with a 34 micron gold absorber, and a resolution of 2.28 eV FWHM at 6 keV in a pixel with a 57 micron gold absorber. This performance has been achieved in pixels that are fabricated directly onto solid substrates. We will describe these results, the characteristics of these detectors, and the expected performance of these at high count rates. We have also demonstrated an array heat-sinking technique that is necessary for high-count rate operation, and shown that this heat-sinking reduces the thermal cross-talk between pixels to an insignificant level that is less than one part in ten thousand. This work was funded under under NASA's ROSES program for Solar and Heliospheric Physics Research.
Bailey Catherine N.
Bandler Simon
Bookbinder Jay
Chervenak James A.
DeLuca Edward E.
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