Future strategic x-ray satellite telescopes, such as the probe-class Advanced x-ray Imaging Satellite (AXIS), will require excellent soft energy response in their imaging detectors to enable maximum discovery potential. In order to characterize Charge-Coupled Device (CCD) and Single Electron Sensitive Read Output (SiSeRO) detectors in the soft x-ray region, the x-ray Astronomy and Observational Cosmology (XOC) group at Stanford has developed, assembled, and commissioned a 2.5-meter-long x-ray beamline test system. The beamline is designed to efficiently produce monoenergetic x-ray fluorescence lines in the 0.3 to 10keV energy range and achieve detector temperatures as low as 173K. We present design and simulation details of the beamline, and discuss the vacuum, cooling, and X-ray fluorescence performance achieved. As a workhorse for future detector characterization at Stanford, the XOC beamline will support detector development for a broad range of x-ray astronomy instruments.
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