Test plan of the BEaTriX paraboloidal mirror at PANTER

Abstract

Scope of this technical note is the definition of a test plan for the X-ray characterization campaign of the BEaTriX paraboloidal mirror at PANTER. The collimating mirror is a core component of the 4.51 keV beamline of the BEaTriX expanded X-ray beam facility; indeed, the optical quality of the mirror will directly affect the collimation and the uniformity of the final beam that will be used to characterize the focusing performance of SPO MM for ATHENA. The mirror is made of HOQ 310 fused quartz, procured from Zeiss in a preliminary grinding and lapping state, and subsequently finished by a sequence of polishing at the Zeeko robotic machine installed at INAF-OAB. Improvement of the mirror figure has been achieved across several runs of IBF process, using the dedicated facility at INAF-OAB. At each polishing/figuring step, the mirror profile and surface roughness have been characterized using suitable metrology tools at MediaLario.