In-Orbit Calibration of Lobster Eye X-ray Telescope

The paper details the design and in-orbit calibration of the Microchannel X-ray Telescope (MXT), a key instrument on the Space-based multi-band astronomical Variable Objects Monitor (SVOM) satellite mission. The MXT is a narrow-field-optimized, lobster eye X-ray focusing telescope, designed to operate in the 0.2 - 10 keV energy band. The unique lobster eye design provides a wide 6-degree field of view with a constant point spread function (PSF) across the entire field. The in-orbit calibration process, using specific target sources, is compared to extensive on-ground calibration data obtained at the PANTER test facility in Germany. The paper also discusses the design and limitations of the electron diverter, which is positioned directly behind the optic. The successful in-orbit calibration of the MXT is crucial for ensuring the accuracy and reliability of its X-ray observations, which are essential for the SVOM mission's objectives. Any discrepancies between on-ground and in-orbit calibration results may necessitate further adjustments to the telescope's operational parameters. The performance of the electron diverter is also a critical factor in the overall effectiveness of the MXT.

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