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Proceedings Paper

High-resolution x-ray spectroscopy using a large format GaAs array
Author(s): Didier D. E. Martin; Alan Owens; Christian Erd; S. Andersson; Anthony J. Peacock; Hans Andersson; V. Lamas; Seppo Arvo Anter Nenonen; N. Haack
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Paper Abstract

We report X-ray measurements on a prototype 1.1 cm2, 32x32 GaAs pixel array produced to assess the technological feasibility of making large area, near Fano-limited arrays which operate near room temperature. Measurements were carried out on four widely separated pixels bot in our laboratories and using monochromatic X-ray pencil beams at the HASYLAB synchrotron research facility in Hamburg, Germany. The pixels were found to be very uniform both in their energy and spatial responses. For example, typical energy resolutions of 300 eV at 10.5 keV, rising to ~560 eV at 60 keV were achieved. The corresponding resolutions measured under full-area illumination were found to be the same within statistics, indicating uniform crystallinity and stoichiometry. Likewise, by raster scanning at 15 keV, 15x15 micrometers 2 beam across each of the pixels, the gain uniformity across the pixels (and by implication the entire array) was determined to be statistically flat.

Paper Details

Date Published: 18 December 2001
PDF: 10 pages
Proc. SPIE 4507, Hard X-Ray and Gamma-Ray Detector Physics III, (18 December 2001); doi: 10.1117/12.450753
Show Author Affiliations
Didier D. E. Martin, European Space Agency (Netherlands)
Alan Owens, European Space Agency (Netherlands)
Christian Erd, European Space Agency (Netherlands)
S. Andersson, European Space Agency (Netherlands)
Anthony J. Peacock, European Space Agency (Netherlands)
Hans Andersson, Metorex International Oy (Finland)
V. Lamas, Metorex International Oy (Finland)
Seppo Arvo Anter Nenonen, Metorex International Oy (Finland)
N. Haack, HASYLAB at DESY (Germany)


Published in SPIE Proceedings Vol. 4507:
Hard X-Ray and Gamma-Ray Detector Physics III
Ralph B. James, Editor(s)

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