Performance of the XMM EPIC MOS CCD detectors

Alexander T. Short; Adam Keay; Martin J. L. Turner

doi:10.1117/12.330276

10 November 1998 Performance of the XMM EPIC MOS CCD detectors

Alexander T. Short, Adam Keay, Martin J. L. Turner

Proceedings Volume 3445, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IX; (1998) https://doi.org/10.1117/12.330276
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Measurements made during the selection and evaluation of flight CCD detectors for the XMM EPIC MOS cameras have demonstrated near Fano limited resolution at x-ray energies above approximately 3keV. At lower energies some devices exhibit a fractional charge loss which is believed to be due to recombination at the epitaxy/oxide interface. This has been modeled through a Monte-Carlo simulation by assuming that the pinning implant in the etched electrode structure can cause electrons to flow to the front surface, rather than to the buried channel. In spite of this charge loss, spectral response may be characterized using a double Gaussian with residuals of < 5 percent. Quantum efficiency has been measured using a lithium drifted silicon reference detector and these measurements combined with analytical and Monte Carlo simulation, event size ratios and cosmic ray detection, all give a value for the effective depletion depth of 30 to 35 micrometers .

Citation Download Citation

Alexander T. Short, Adam Keay, and Martin J. L. Turner "Performance of the XMM EPIC MOS CCD detectors", Proc. SPIE 3445, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IX, (10 November 1998); https://doi.org/10.1117/12.330276

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