A prototype of an X-ray microcalorimeter using Titanium/Gold transition edge sensor (TES) for detecting cosmic rays is fabricated and tested. This paper reports first experimental result of the prototype. By using silicon bulk micromachining, freestanding microstructure suspended with fine beams are obtained to achieve thermal isolation from the substrate. A superconductor, Ti in this case, can be used as a very sensitive temperature sensor at the narrow temperature range around its transition temperature. At the low temperatures below 1 K, the microstructure with very small heat capacity is expected to be thermally detecting single photons. Design consideration to realize radiation detection with extremely good energy resolution has been taken place. Our tentative goal is to obtain the energy resolution of 20 eV for 10 keV radiation at 0.5 K. We have fabricated a test device of the TES. The sensitivity of it is larger than 1000, which is enough for this purpose. The energy resolution of the prototype of the X-ray microcalorimeter was 550 eV (FWHM) for 6 keV radiation at approximately 0.5 K. This value is smaller than that expected. An optimization of the TES features is still necessary for a good energy resolution.
|ジャーナル||Proceedings of SPIE - The International Society for Optical Engineering|
|出版ステータス||Published - 1999 12 1|
|イベント||Proceedings of the 1999 Design, Characterization, and Packaging for MEMS and Microelectronics - Royal Pines Resort, Aust|
継続期間: 1999 10 27 → 1999 10 29
ASJC Scopus subject areas
- コンピュータ サイエンスの応用