Fabrication, performance, and figure metrology of epoxy-replicated aluminum foils for hard x-ray focusing multilayer-coated segmented conical optics

We fabricated x-ray mirrors for hard x-ray (greater than or equal to 10 keV ) telescopes using multilayer coatings and an improved epoxy-replicated alu minum foil (ERAF) nonvacuum technology. The ERAF optics have similar to1 ar cmin axial figure half-power diameter (HPD) and passed environmental testin g. Reflectivity measurements at 8 keV on ERAFs with and without multilayer coatings show a 4.4 to 4.8 A root mean square (rms) microroughness for corr elation lengths less than or equal to 15 mum. To reduce the dominant contri bution of mirror assembly and large-scale distortion in the overall telesco pe HPD, we designed a figure metrology system and a new mounting technique. We describe a cylindrical metrology system built for fast axial and roundn ess figure measurement of hard x-ray conical optics. These developments low er cost and improve the optics performance of the HEFT (high-energy focusin g telescope) and Constellation-X missions. (C) 2000 society of Photo-Optica l Instrumentation Engineers. [S0091-3286(00)01611-1].