Asphericalizing the Light Collection Mirror for the 200-Point Thomson Scattering Diagnostic Installed on the Large Helical Device

摘要

Shown is a possibility to make the image of a laser beam over a distance of 2.5 m,formed by the spherical multi-segment mirror installed in LHD,twice sharper by suitably adjustingthe inclination of each segment mirror,which is equivalent to making the mirror surface aspherical.This will further enhance the attractiveness of a mirror-based Thomson scattering system.