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Energy scale calibration and drift correction of the X-IFU by Cucchetti, Edoardo; Eckart, Megan E.; Peille, Philippe; de Vries, Cor; Pajot, François; Pointecouteau, Etienne; Leutenegger, Maurice; Kilbourne, Caroline A.; Porter, Frederick S. is a scholarly article available to read on EtoBox.

What is Energy scale calibration and drift correction of the X-IFU about?

The Athena X-Ray Integral Field Unit (X-IFU) will provide spatially resolved high-resolution spectroscopy (2.5 eV FWHM up to 7 keV) over the 0.2 to 12 keV energy band. It will comprise an array of 3840 superconducting Transition Edge Sensors (TESs) operated at 90 mK, with an absolute energy scale accuracy of 0.4 eV. Slight changes in the TES operating environment can cause significant variations in its energy response function, which may result in degradation of the detector's energy resolution, and eventually in systematic errors in the absolute energy scale if not properly corrected. These changes will be monitored via an onboard Modulated X-ray Source (MXS) and the energy scale will be corrected accordingly using a multi-parameter interpolation of gain curves obtained during ground calibration. Assuming realistic MXS configurations and using the instrument end-to-end simulator SIXTE, we investigate here both statistical and systematic effects on the X-IFU energy scale, occurring either during ground measurements or in-flight. The corresponding impacts on the energy resolution and means of accounting for these errors are also addressed. We notably demonstrate that a multi-paramet

Author

Cucchetti, Edoardo; Eckart, Megan E.; Peille, Philippe; de Vries, Cor; Pajot, François; Pointecouteau, Etienne; Leutenegger, Maurice; Kilbourne, Caroline A.; Porter, Frederick S.

Published

2018

Language

EN