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Towards Mo/Au based TES detectors for Athena/X-IFU

AuthorsFàbrega, Lourdes ; Camón, Agustín; Costa Krämer, José Luis ; Pobes, Carlos; Parra-Borderías, María ; Fernández-Martínez, Iván ; Ceballos, María Teresa ; Barcons, Xavier ; Sesé Monclús, Javier
Issue Date2014
CitationSpace Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
AbstractThe 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.
DescriptionResumen del trabajo presentado al "Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray" celebrado en Montreal (Canadá) del 22 al 26 de junio de 2014.-- et al.
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