Fabrication of an Axisymmetric Wolter Type I Mirror with a Gold Deposited Reflecting Surface

Publisher Website
Google Scholar
Abstract
A small axisymmetric Wolter type I mirror was fabricated by a new film deposition method for an X-ray reflecting surface. In the film deposition, a gold (Au) electrode was inserted into a glass replica of the mirror. An Ar discharge was generated inside the replica at a discharge pressure of 44 Pa when a 40 kHz radio-frequency high voltage (-1.5–-3 kV) was supplied to the electrode. As a result of Au sputtering in the discharge, a 30 nm-thick Au film was deposited on the replica inner surface. The Au deposited surface had a surface roughness of 5–10 nm (peak to valley). A 300 µm-diameter X-ray beam with a reflectivity of 20% was obtained using a 6 mm-diameter MgKα X-ray (1253.6 eV) source. The present deposition method is suitable for producing metal deposited reflecting surfaces of axisymmetric X-ray mirrors.