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Temporal Gain Correction for X-Ray Calorimeter SpectrometersCalorimetric X-ray detectors are very sensitive to their environment. The boundary conditions can have a profound effect on the gain including heat sink temperature, the local radiation temperature, bias, and the temperature of the readout electronics. Any variation in the boundary conditions can cause temporal variations in the gain of the detector and compromise both the energy scale and the resolving power of the spectrometer. Most production X-ray calorimeter spectrometers, both on the ground and in space, have some means of tracking the gain as a function of time, often using a calibration spectral line. For small gain changes, a linear stretch correction is often sufficient. However, the detectors are intrinsically non-linear and often the event analysis, i.e., shaping, optimal filters etc., add additional non-linearity. Thus for large gain variations or when the best possible precision is required, a linear stretch correction is not sufficient. Here, we discuss a new correction technique based on non-linear interpolation of the energy-scale functions. Using Astro-HSXS calibration data, we demonstrate that the correction can recover the X-ray energy to better than 1 part in 104 over the entire spectral band to above 12 keV even for large-scale gain variations. This method will be used to correct any temporal drift of the on-orbit per-pixel gain using on-board calibration sources for the SXS instrument on the Astro-H observatory.
Document ID
Document Type
Reprint (Version printed in journal)
Porter, F. S. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Chiao, M. P. (Alcyon Technical Services-JV, Inc. Huntsville, AL, United States)
Eckart, M. E. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Fujimoto, R. (Kanazawa Univ. Japan)
Ishisaki, Y. (Tokyo Metropolitan Univ. Tokyo, Japan)
Kelley, R. L. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Kilbourne, C. A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Leutenegger, M. A. (Maryland Univ. College Park, MD, United States)
McCammon, D. (Wisconsin Univ. Madison, WI, United States)
Mitsuda, K. (Tokyo Univ. Sagamihara, Japan)
Date Acquired
April 6, 2017
Publication Date
January 27, 2016
Publication Information
Publication: Journal of Low Temperature Physics
Volume: 184
Issue: 1
ISSN: 0022-2291
Subject Category
Report/Patent Number
Funding Number(s)
Distribution Limits
X-ray detector X-ray spectrometer X-ray calorimeter