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A Digital Readout Scheme for Arrays of Microcalorimeter X-Ray Detectors

Published online by Cambridge University Press:  02 July 2020

S. Nam ,
D.A. Wollman ,
G.C. Hilton ,
J. Chervenak ,
S. Deiker ,
K.D. Irwin  and
John M. Martinis
S. Nam
Affiliation:
National Institute of Standards and Technology, Boulder, CO80303
D.A. Wollman
Affiliation:
National Institute of Standards and Technology, Boulder, CO80303
G.C. Hilton
Affiliation:
National Institute of Standards and Technology, Boulder, CO80303
J. Chervenak
Affiliation:
National Institute of Standards and Technology, Boulder, CO80303
S. Deiker
Affiliation:
National Institute of Standards and Technology, Boulder, CO80303
K.D. Irwin
Affiliation:
National Institute of Standards and Technology, Boulder, CO80303
John M. Martinis
Affiliation:
National Institute of Standards and Technology, Boulder, CO80303
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Extract

While the performance of single-pixel microcalorimeter x-ray detectors has been shown to be very useful for microanalysis1, arrays of microcalorimeters will have a further impact on energy dispersive spectroscopy (EDS) by providing higher total count rates and larger effective areas. We are developing a system with a 32x32 pixel array with a total area of 40 mm2 and with a total count rate between 105 and 106 s-1. One of the challenges in constructing an array-based system will be the readout electronics.

In a typical microcalorimeter EDS setup, shown in Fig. 1, the microcalorimeter is readout using a cryogenic amplifier (SQUID system) and analog feedback electronics to control the SQUID. The signal from the room-temperature SQUID electronics is either attached to a spectroscopy-grade shaping amplifier and MCA for real-time analog signal processing or attached to a digitizer for optimal pulse processing.

Type
New Detectors—Benefits and Drawbacks
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 742 - 743
Copyright
Copyright © Microscopy Society of America

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References

References:

1.Wollman, D. A., et al., J. Microscopy 188 (197), 196.CrossRefGoogle Scholar
2. United States Patent 5,299,138 (March.29, 1994) Desk Top Spectrum Analyzer (DTSA) Awarded to Charles E. Fiori (McLean, VA) and Carol R. Swyt (Germantown, MD).Google Scholar
3. Contribution of the U.S. Government; not subject to copyrightGoogle Scholar