TES microcalorimeter development for future Japanese X-ray astronomy missions

Details TES microcalorimeter development for future Japanese X-ray astronomy missions TES microcalorimeter development for future Japanese X-ray astronomy missions

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004nimpa.520..431f&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 520, Issue 1-3, p. 431-434.

Astronomy and Astrophysics

Astronomy

X-Ray Astronomy, Microcalorimeter, Transition Edge Sensor

Scientific paper

We are developing a Ti/Au TES microcalorimeter array for future Japanese X-ray astronomy missions. The goal is an energy resolution of 2-5eV at 6keV, and an array of 100-1000 pixels to achieve a geometrical area of >1cm2 and a moderate spatial resolution simultaneously. The energy resolution was improved to ~6eV at 6keV with a very fast time constant (<100μs). To achieve a high coverage fraction, it is necessary to fabricate mushroom-shaped X-ray microabsorbers. We are developing an electrodeposition fabrication technique that is suitable for our process. Sn was used as absorber material, but the energy resolution was not good due to the existence of long-lived quasiparticles. Bi is also used, and the process is under optimization now. The readout strategy is to multiplex signals in the frequency domain, using a bridge circuit. So far, we succeeded in multiplexing two pixels modulated with 50 and 20kHz at 440mK. The energy resolution obtained at 110mK was 33eV(25kHz).

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