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NASA Technical Reports Server (NTRS) 20080039564: The In-flight Spe... |
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by NASA Technical Reports Server (NTRS) |
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The Swift X-ray Telescope focal plane camera is a front- |
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illuminated MOS CCD, providing a spectral response kernel |
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of 135 eV FWHM at 5.9 keV as measured before launch. We |
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describe the CCD calibration program based on celestial |
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and on-board calibration sources, relevant in-flight |
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experiences, and developments in the CCD response model. |
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We illustrate how the revised response model describes |
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the calibration sources well. Comparison of observed |
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spectra with models folded through the instrument |
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response produces negative residuals around and below the |
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Oxygen edge. We discuss several possible causes for such |
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residuals. Traps created by proton damage on the CCD |
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increase the charge transfer inefficiency (CTI) over |
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time. We describe the evolution of the CTI since the |
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launch and its effect on the CCD spectral resolution and |
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the gain. |
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Date Published: 2016-10-30 04:11:16 |
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Identifier: NASA_NTRS_Archive_20080039564 |
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Item Size: 16657264 |
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Language: english |
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Media Type: texts |
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