Next: 1 INTRODUCTION
X-ray CCD Calibration for the AXAF CCD Imaging Spectrometer
M. Bautz, S. Kissel, G. Prigozhin, S. Jones, T. Isobe,
H. Manning, M. Pivovaroff, G. Ricker and J. Woo
Massachusetts Institute of Technology Center for Space Research,
Cambridge, MA 02139
[1]Current Address: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138
Abstract:
We summarize the strategy and techniques used to calibrate
X-ray CCD detectors for the AXAF CCD Imaging Spectrometer in the spectral range
between 0.2 keV and 10 keV. The very demanding calibration
requirements (energy scale knowledge error of order 0.1%; detection
efficiency knowledge error of order 1%) are reviewed. The primary
standards chosen for the calibration are discussed, with particular
attention to the use of undispersed synchrotron radiation as a primary
radiometric standard for the detection efficiency calibration. We review the
basic models of the detector response which it is the objective of the
calibration enterprise to constrain. The
accuracy and reproducibility of the energy scale, spectral redistribution
and detection efficiency calibration is discussed and illustrated with
sample results from calibration of flight detectors.
Keywords: X-rays, charge coupled devices (CCD), calibration, AXAF, ACIS
mwb@space.mit.edu