Development of Arrays of Transition Edge Sensors for Application in X-ray Astronomy

Bruijn, M P, Bergmann Tiest, W M, Hoevers, H F C, Krouwer, E, van der Kuur, J, Ridder, M L, Moktadir, Z, Wiegerink, R, van Gelder, D and Elwenspoek, M (2002) Development of Arrays of Transition Edge Sensors for Application in X-ray Astronomy. SeSens 2002, Veldhoven, The, Netherlands. pp. 598-602 .

Abstract

The development of an array of voltage biased superconducting transition edge microcalorimeters is described. This work is directed to an application in future X-ray Astronomy missions, such as Constellation-X (USA) and the X-ray Evolving Universe Spectroscopy Mission (XEUS, Europe). After several years of very successful development of single pixel microcalorimeters (SRON showed a record energy resolution ?EFWHM < 4 eV for 5.9 keV photons, combined with an effective time constant of 150 ?s and high x-ray absorption efficiency) work towards an array of 32 x 32 pixels has started. Aiming at a prototype of 5 x 5 pixels, several options for fabrication, using micromachining techniques are under study, both experimentally and theoretically. Measurement of thermal transport in detector support structures at sub-Kelvin temperatures indicates ballistic phonon transport. The detector development is accompanied by finite element modeling.

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