title: Note: O-ring stack system for electron gun alignment.
abstract: We present a reliable method for aligning an electron gun which consists of an electron source and lenses by controlling a stack of rubber O-rings in a vacuum condition. The beam direction angle is precisely tilted along two axes by adjusting the height difference of a stack of O-rings. In addition, the source position is shifted in each of three orthogonal directions. We show that the tilting angle and linear shift along the x and y axes as obtained from ten stacked O-rings are ±2.55° and ±2 mm, respectively. This study can easily be adapted to charged particle gun alignment and adjustments of the flange position in a vacuum, ensuring that its results can be useful with regard to electrical insulation between flanges with slight modifications.
authors: Korea Research Institute of Standards and Science (KRISS), Daejeon 305-340, South Korea.
authors: In-Yong
authors: IY
authors: Park
authors: Korea Research Institute of Standards and Science (KRISS), Daejeon 305-340, South Korea.
authors: Boklae
authors: B
authors: Cho
authors: Korea Research Institute of Standards and Science (KRISS), Daejeon 305-340, South Korea.
authors: Cheolsu
authors: C
authors: Han
authors: Korea Research Institute of Standards and Science (KRISS), Daejeon 305-340, South Korea.
authors: Seungmin
authors: S
authors: Shin
authors: Korea Research Institute of Standards and Science (KRISS), Daejeon 305-340, South Korea.
authors: Dongjun
authors: D
authors: Lee
authors: Korea Research Institute of Standards and Science (KRISS), Daejeon 305-340, South Korea.
authors: Sang Jung
authors: SJ
authors: Ahn
mesh_terms: D004583:Electrons; D004867:Equipment Design; D007909:Lenses; D010315:Particle Accelerators / Q000295:instrumentation*