title: Tangential soft-x ray imaging for three-dimensional structural studies in a reversed field pinch.
abstract: Tangential soft-x ray (SXR) imaging diagnostic has been developed and three-dimensional (3D) structure of the internal magnetic surface has been deduced by comparing the experimental and calculated two-dimensional SXR images in a reversed field pinch. The SXR imaging system, consisting of a MCP, a fluorescent plate, and an intensified charge coupled device camera, has been installed in REversed field pinch of Low-Aspect-ratio eXperiment (RELAX) machine. Major characteristics of an experimental SXR image could be reproduced by numerical calculations of the image using a single island model, suggesting a helical hot core in RELAX. The SXR imaging system could be useful for 3D structural studies when tangential and vertical simultaneous imaging systems would be installed, with appropriate numerical modeling of 3D structure of the magnetic surfaces.
authors.affiliation: Department of Electronics, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan. onchi5t@nuclear.es.kit.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Onchi
authors.forename: R
authors.initials: R
authors.lastname: Ikezoe
authors.forename: K
authors.initials: K
authors.lastname: Oki
authors.forename: A
authors.initials: A
authors.lastname: Sanpei
authors.forename: H
authors.initials: H
authors.lastname: Himura
authors.forename: S
authors.initials: S
authors.lastname: Masamune