At the PANTER x-ray test facility of the Max-Planck-Institute for extraterrestrial Physics, x-ray optics for future missions are developed, tested, and calibrated. For the ESA mission NewATHENA many campaigns to test individual Silicon Pore Optic (SPO) mirror modules have been performed to monitor the different aspects of the performance improvement in terms of Half Energy Width (HEW) of the image Point Spread Function (PSF) and the effective area of the optic. Support is also provided for new x-ray optic test facilities such as the recently commissioned BEaTriX facility for characterizing individual SPO mirror modules and the future VERT-X facility designed to test and calibrate the complete NewATHENA mirror by scanning it with a small parallel x-ray beam. The optics (such as parabolas, Wolter-1) needed for the facilities are calibrated at PANTER using a parallel beam generated with a Fresnel Zone-Plate optimized for 1.5 keV. The results of the recent remeasuring of the SPO “measurement standard” optic is presented here. The objective of this test aimed to confirm the sustained stability of the optical component itself, along with variations between BESSY II in Berlin, PANTER in Neuried, both located in Germany, and the newly finished Minerva beamline at ALBA in Barcelona, Spain. The outcomes from PANTER validate the constancy of the "measurement standard" optic, affirming that crucial parameters, notably the Half-Energy Width (HEW) of the Point Spread Function (PSF), remain unaltered.
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