TiAu-based micro-calorimeters for space applications

Dirks, B.; Popescu, M.; Bruijn, M. P.; Gottardi, L.; Hoevers, H.; Korte, P. A. J. de; Kuur, J. van der; Ridder, M.; Takei, Yoh

doi:10.1016/j.nima.2009.05.114

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…Considering the earlier reported lower limit for the coherence length value of Mo, f 0 ^271 nm [14], equations (4) indicate that for the studied thickness range it is likely that t;(T) > d, which points out that the analyzed films might be 2D superconductors. The parallel upper critical field for a 2D superconductor is defined by [26]:…”

Section: Critical Fieldsmentioning

confidence: 75%

“…The transition temperature for the bilayer can be tuned by the proximity effect and their thermal diffusion can be enlarged by using noble metal layers with high residual resistivity ratios (RRR). Among the many N/S bilayers fabricated and tested [2][3][4][5][6], Mo-based bilayers have demonstrated to be one of the best choices. They have achieved the best spectral resolution in TES [6] and at present exhibit the best long-term stability.…”

Section: Introductionmentioning

confidence: 99%

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Size and dimensionality effects in superconducting Mo thin films

Fàbrega

Camón

Fernández-Martínez³

et al. 2011

Supercond. Sci. Technol.

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Molybdenum is a low T c , type I superconductor whose fundamental properties are poorly known. Its importance as an essential constituent of new high performance radiation detectors, the so-called transition edge sensors (TESs) calls for better characterization of this superconductor, especially in thin film form. Here we report on a study of the basic superconducting features of Mo thin films as a function of their thickness. The resistivity is found to rise and the critical temperature decreases on decreasing film thickness, as expected. More relevant, the critical fields along and perpendicular to the film plane are markedly different, thickness dependent and much larger than the thermodynamic critical field of Mo bulk. These results are consistent with a picture of type II 2D superconducting films, and allow estimates of the fundamental superconducting lengths of Mo. The role of morphology in determining the 2D and type II character of the otherwise type I molybdenum is discussed. The possible consequences of this behaviour on the performance of radiation detectors are also addressed.

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Section: Critical Fieldsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Size and dimensionality effects in superconducting Mo thin films

Fàbrega

Camón

Fernández-Martínez³

et al. 2011

Supercond. Sci. Technol.

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“…The K-alpha spectrum of a Fe-55 radioactive source detected with this pixel is shown in Fig. (1). We measured an energy resolution of 2.5 eV at 5.9 keV under DC bias.…”

Section: Introductionmentioning

confidence: 99%

Development of TES-based detectors array for the X-ray Integral Field Unit (X-IFU) on the future x-ray observatory ATHENA

et al. 2014

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We are developing transition-edge sensor (TES)-based microcalorimeters for the X-ray Integral Field Unit (X-IFU) of the future European X-Ray Observatory Athena. The microcalorimeters are based on TiAu TESs coupled to 250µm squared, AuBi absorbers. We designed and fabricated devices with different contact geometries between the absorber and the TES to optimise the detector performance and with different wiring topology to mitigate the self-magnetic field. The design is tailored to optimise the performance under Frequency Domain Multiplexing. In this paper we review the main design feature of the pixels array and we report on the performance of the 18 channels, 2-5MHz frequency domain multiplexer that will be used to characterised the detector array.

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“…Two options are under consideration for the X-IFU microcalorimeters: Ti/Au bilayers 7 or Mo/Au bilayers. These two materials have been shown to provide the X-ray spectrometers with the highest spectral resolution so far 7,8,9 , and are therefore the best possible candidates to meet the overall spectral resolution requirements of X-IFU.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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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 Si 3 N 4 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 R n and operation temperature values. Very sharp transitions (~few mK transition width) are obtained, with typically R n~2 5mΩ and T c~ 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.

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TiAu-based micro-calorimeters for space applications

Cited by 4 publications

References 7 publications

Size and dimensionality effects in superconducting Mo thin films

Size and dimensionality effects in superconducting Mo thin films

Development of TES-based detectors array for the X-ray Integral Field Unit (X-IFU) on the future x-ray observatory ATHENA

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

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