Design, structure, and performance of narrow band multilayer mirrors for solar imaging

In response to the needs of a solar imaging program, we designed, fabricated, and evaluated several multilayer mirror coatings for an x-ray telescope to image the sun at 9.39 nm (Fe XVIII). The telescope optic is a single-mirror Herschelian design operating at near normal incidence. Simulations using commercially available software guided preliminary multilayer mirror design. Based upon these calculations, dual ion beam assisted deposition techniques generated trial films and multilayers. Structural evaluations were carried out on a multiaxis x- ray (0.154 nm) reflectometer with specular reflection and non-specular scattering measurements. Performance parameters for the multilayers at design wavelength were obtained from the NIST EUV reflectometer at the SURF II storage ring.