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  • Instrumentation and Photography  (2)
  • 2005-2009  (2)
  • 2008  (2)
  • 1
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    Array-scale performance of TES X-ray Calorimeters Suitable for Constellation-X (2008)
    In:  Other Sources
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    Publication Date: 2019-07-19
    Description: Having developed a transition-edge-sensor (TES) calorimeter design that enables high spectral resolution in high fill-factor arrays, we now present array-scale results from 32-pixel arrays of identical closely packed TES pixels. Each pixel in such an array contains a Mo/Au bilayer with a transition temperature of 0.1 K and an electroplated Au or Au/Bi xray absorber. The pixels in an array have highly uniform physical characteristics and performance. The arrays are easy to operate due to the range of bias voltages and heatsink temperatures over which solution better than 3 eV at 6 keV can be obtained. Resolution better than 3 eV has also been obtained with 2x8 time-division SQUID multiplexing. We will present the detector characteristics and show spectra acquired through the read-out chain from the multiplexer electronics through the demultiplexer software to real-time signal processing. We are working towards demonstrating this performance over the range of count rates expected in the observing program of the Constellation-X observatory. We mill discuss the impact of increased counting rate on spectral resolution, including the effects of crosstalk and optimal-filtering dead time.
    Keywords: Instrumentation and Photography
    Type: Applied Superconductivity; Aug 18, 2008 - Aug 22, 2008; Chicago, IL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Development of Position-sensitive Transition-edge Sensor X-ray Detectors (2008)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: We report on the development of position-sensitive transition-edge sensors (PoST's) for future x-ray astronomy missions such as the International X-ray Observatory (IXO), currently under study by NASA and ESA. PoST's consist of multiple absorbers each with a different thermal coupling to one or more transition-edge sensor (TES). This differential thermal coupling between absorbers and TES's results in different characteristic pulse shapes and allows position discrimination between the different pixels. The development of PoST's is motivated by a desire to achieve maximum focal-plane area with the least number of readout channels and as such. PoST's are ideally suited to provide a focal-plane extension to the Constellation-X microcalorimeter array. We report the first experimental results of our latest one and two channel PoST's, which utilize fast thermalizing electroplated Au/Bi absorbers coupled to low noise Mo/Au TES's - a technology already successfully implemented in our arrays of single pixel TES's. We demonstrate 6 eV energy resolution coupled with spatial sensitivity in the keV energy range. We also report on the development of signal processing algorithms to optimize energy and position sensitivity of our detectors.
    Keywords: Instrumentation and Photography
    Type: Applied Superconductivity Conference; Aug 16, 2008 - Aug 23, 2008; Mons.; Belgium
    Format: text
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    NASA TECHNICAL REPORTS
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