[B-3-1] Surface processing of a μ-channel-cut crystal monochromator for reflection self-seeding of hard X-ray free-electron laser 〇Shotaro Matsumura1、Shota Nakano1、Yasuhisa Sano1、Taito Osaka2、Ichiro Inoue2、Satoshi Matsuyama1、Makina Yabashi2、Kazuto Yamauchi1 (1.Osaka University、2.RIKEN SPring-8 Center) キーワード:Processing、X-ray crystal monochromator、Atmospheric-pressure plasma、Damage-free etching、