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Proceedings Paper

Towards Mo/Au based TES detectors for Athena/X-IFU
Author(s): Lourdes Fàbrega; Agustín Camón; José Luís Costa-Krämer; Carlos Pobes; María Parra-Borderías; Iván Fernández-Martínez; Rosa Jáudenes; Pedro Cereceda; María Teresa Ceballos; Xavier Barcons; Javier Sesé; Jesús Martín-Pintado; Luciano Gottardi; Marcel Bruijn; Madhu Jambunathan; Roland H. den Hartog; Jan van der Kuur; Jan-Willem den Herder; Didier Barret
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Paper Abstract

The X-ray spectroscopy telescope Athena has been designed to implement the science theme "the hot and energetic universe", selected by the European Space Agency as the second large mission of its Cosmic Vision program. X-IFU, one of the two interchangeable focal plane instruments of Athena, is a high resolution X-ray spectrometer made of a large array of Transition Edge Sensors. Two options are under consideration for the X-IFU microcalorimeters: Ti/Au bilayers or Mo/Au bilayers. Here we report on our efforts to develop Mo/Au-based TES. The TES are made of high quality superconducting Mo/Au bilayers fabricated at room temperature on low stress Si3N4 membranes; Mo is deposited by RF magnetron sputtering and in-situ covered by a thin (15nm) Au layer deposited by DC sputtering; in a second step, the Au layer thickness is increased ex-situ by e-beam deposition, to obtain suitable resistance Rn and operation temperature values. Very sharp transitions (~few mK transition width) are obtained, with typically Rn~25mΩ and Tc~ 100-120mK for 65/215 bilayers. First simple TES designs are being tested. Also, Bi films several μm thick, intended to constitute the X-ray absorber, are fabricated by electrochemical deposition.

Paper Details

Date Published: 29 July 2014
PDF: 7 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91445P (29 July 2014); doi: 10.1117/12.2056900
Show Author Affiliations
Lourdes Fàbrega, Instituto de Ciència de Materiales de Barcelona (Spain)
Agustín Camón, Instituto de Ciència de Materiales de Aragón, CSIC, Univ. de Zaragoza (Spain)
José Luís Costa-Krämer, Instituto de Microelectrónica de Madrid, CSIC (Spain)
Carlos Pobes, Instituto de Ciència de Materiales de Aragón, CSIC, Univ. de Zaragoza (Spain)
María Parra-Borderías, IRIS SPAIN (Spain)
Ctr. de Astrobiología, Instituto Nacional de Técnica Aeroespacial, CSIC (Spain)
Iván Fernández-Martínez, Nano4energy S.L.N.E., Univ. Politécnica de Madrid (Spain)
Rosa Jáudenes, Instituto de Microelectrónica de Madrid, CSIC (Spain)
Pedro Cereceda, Instituto de Microelectrónica de Madrid, CSIC (Spain)
María Teresa Ceballos, Instituto de Física de Cantabria, CSIC, Univ. de Cantabria (Spain)
Xavier Barcons, Instituto de Física de Cantabria, CSIC, Univ. de Cantabria (Spain)
Javier Sesé, Instituto de Nanociencia de Aragón, Univ. de Zaragoza (Spain)
Jesús Martín-Pintado, Instituto Nacional de Técnica Aeroespacial, CSIC (Spain)
Luciano Gottardi, SRON Netherlands Institute for Space Research (Netherlands)
Marcel Bruijn, SRON Netherlands Institute for Space Research (Netherlands)
Madhu Jambunathan, SRON Netherlands Institute for Space Research (Netherlands)
Roland H. den Hartog, SRON Netherlands Institute for Space Research (Netherlands)
Jan van der Kuur, SRON Netherlands Institute for Space Research (Netherlands)
Jan-Willem den Herder, SRON Netherlands Institute for Space Research (Netherlands)
Didier Barret, Observatoire Midi-Pyrénées, IRAP, CNRS, Univ. de Toulouse (France)


Published in SPIE Proceedings Vol. 9144:
Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz, Editor(s)

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