Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4140..376u&link_type=abstract
Proc. SPIE Vol. 4140, p. 376-383, X-Ray and Gamma-Ray Instrumentation for Astronomy XI, Kathryn A. Flanagan; Oswald H. Siegmund;
Astronomy and Astrophysics
Astronomy
Scientific paper
We have fabricated a bridge-type structure for microcalorimeters with superconducting transition-edge sensors (TES). Instead of open space under a SiNx membrane in conventional TES microcalorimeters, the bridge-type calorimeters have SiNx membrane floating on the Si substrate covered by a SiO2 layer with a small gap of 30 - 50 micrometer. The bridge-type structure ensures that the calorimeters are mechanically tough. In addition, the thermal conductance can easily be controlled by changing the width, length, or thickness of the SiNx bridge. The calorimeters, of which operating temperature is 0.43 K, consist of a Ti/Au bilayer TES and an Au absorber. The x-ray events were read out by a DC-SQUID current amplifier with a 200-series array of SQUIDs placed on a 4.2 K stage. By analyzing the output pulse shapes, it has been found that the pulses are put into two categories. One has a fast rise time of approximately 3 microseconds and two decay components with time constants of approximately 10 microseconds and about approximately 130 microseconds. Another one has a longer rise time of approximately 10 microseconds and a single decay component of approximately 130 microseconds. It is considered that the pulse shapes depend on the x-ray absorption positions and the heat-flow pass.
Chinone Kazuo
Hikosaka Tomotaka
Hirayama Fuminori
Kawabe Ushio
Kobayashi Naoto
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