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  • 1
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    Performance of an X-ray Microcalorimeter with a 240 m Absorber and a 50 m TES Bilayer (2018)
    In:  Other Sources
    Details
    Publication Date: 2019-07-20
    Description: Superconducting transition-edge sensor (TES) microcalorimeters are being developed for a variety of potential astrophysics missions, including Athena. The X-ray integral field unit instrument on this mission requires close-packed pixels on a 0.25 mm pitch, and high quantum efficiency between 0.2 and 12 keV. In this work, we describe a new approach with 50 m square TESs consisting of a Mo/Au bilayer, deposited on silicon nitride membranes to provide a weak thermal conductance to a ~50 mK heat bath. Larger TESs usually have additional normal metal stripes on top of the bilayer to reduce the noise. However, we have found that excellent spectral performance can be achieved without the need for any normal metal stripes on top of the TES. A spectral performance of 1.58+/-0.12 eV at 5.9 keV has been achieved, the best resolution seen in any of our devices with this pixel size.
    Keywords: Electronics and Electrical Engineering
    Type: GSFC-E-DAA-TN68358 , GSFC-E-DAA-TN61299 , Journal of Low Temperature Physics (ISSN 0022-2291) (e-ISSN 1573-7357); 193; 3-4; 337–343
    Format: text
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  • 2
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    Heat Sinking, Cross Talk, and Temperature Stability for Large, Close-Packed Arrays of Microcalorimeters (2007)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: We are developing large, close-packed arrays of x-ray transition-edge sensor (TES) microcalorimeters. In such a device, sufficient heat sinking is important to to minimize thermal cross talk between pixels and to stabilize the bath temperature for all pixels. We have measured cross talk on out 8 x 8 arrays and studied the shape and amount of thermal crosstalk as a function of pixel location and efficiency of electrothermal feedback. In this presentation, we will compare measurements made on arrays with and without a backside, heat-sinking copper layer, as well as results of devices on silicon-nitride membranes and on solid substrates, and we will discuss the implications for energy resolution and maximum count rate. We will also discuss the dependence of pulse height upon bath temperature, and the measured and required stability of the bath temperature.
    Keywords: Electronics and Electrical Engineering
    Type: LTD-12 Conference; Jul 22, 2007 - Jul 29, 2007; Paris; France
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  • 3
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    Modelling of TES X-ray Microcalorimeters with a Novel Absorber Design (2007)
    In:  Other Sources
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    Publication Date: 2019-07-19
    Description: Our development of a novel x-ray absorber design that has enabled the incorporation of high-conductivity electroplated gold into our absorbers has yielded devices that not only have achieved breakthrough performance at 6 keV, but also are extraordinarily well modelled. We have determined device parameters that reproduce complex impedance curves and noise spectra throughout transition. Observed pulse heights, decay time and baseline energy resolution were in good agreement with simulated results using the same parameters. In the presentation, we will show these results in detail and we will also show highlights of the characterization of our gold/bismuth-absorber devices. We will discuss possible improvement of our current devices and expected performance of future devices using the modelling results.
    Keywords: Electronics and Electrical Engineering
    Type: LTD-12 Conference; Jul 22, 2007 - Jul 29, 2007; Paris; France
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  • 4
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    Development of a Real-Time Pulse Processing Algorithm for TES-Based X-Ray Microcalorimeters (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We report here a real-time pulse processing algorithm for superconducting transition-edge sensor (TES) based x-ray microcalorimeters. TES-based. microca1orimeters offer ultra-high energy resolutions, but the small volume of each pixel requires that large arrays of identical microcalorimeter pixe1s be built to achieve sufficient detection efficiency. That in turn requires as much pulse processing as possible must be performed at the front end of readout electronics to avoid transferring large amounts of data to a host computer for post-processing. Therefore, a real-time pulse processing algorithm that not only can be implemented in the readout electronics but also achieve satisfactory energy resolutions is desired. We have developed an algorithm that can be easily implemented. in hardware. We then tested the algorithm offline using several data sets acquired with an 8 x 8 Goddard TES x-ray calorimeter array and 2x16 NIST time-division SQUID multiplexer. We obtained an average energy resolution of close to 3.0 eV at 6 keV for the multiplexed pixels while preserving over 99% of the events in the data sets.
    Keywords: Electronics and Electrical Engineering
    Type: GSFC.JA.6368.2012 , IEEE Transactions on Applied Superconductivity; 21; 3; 276-280
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  • 5
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    Thermal Transport Model for Heat Sink Design (2009)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A document discusses the development of a finite element model for describing thermal transport through microcalorimeter arrays in order to assist in heat-sinking design. A fabricated multi-absorber transition edge sensor (PoST) was designed in order to reduce device wiring density by a factor of four. The finite element model consists of breaking the microcalorimeter array into separate elements, including the transition edge sensor (TES) and the silicon substrate on which the sensor is deposited. Each element is then broken up into subelements, whose surface area subtends 10 10 microns. The heat capacity per unit temperature, thermal conductance, and thermal diffusivity of each subelement are the model inputs, as are the temperatures of each subelement. Numerical integration using the Finite in Time Centered in Space algorithm of the thermal diffusion equation is then performed in order to obtain a temporal evolution of the subelement temperature. Thermal transport across interfaces is modeled using a thermal boundary resistance obtained using the acoustic mismatch model. The document concludes with a discussion of the PoST fabrication. PoSTs are novel because they enable incident x-ray position sensitivity with good energy resolution and low wiring density.
    Keywords: Man/System Technology and Life Support
    Type: GSC-15671-1 , NASA Tech Briefs, December 2009; 27
    Format: application/pdf
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