title: A model of plasma current through a hole of Rogowski probe including sheath effects.
abstract: In TST-2 Ohmic discharges, local current is measured using a Rogowski probe by changing the angle between the local magnetic field and the direction of the hole of the Rogowski probe. The angular dependence shows a peak when the direction of the hole is almost parallel to the local magnetic field. The obtained width of the peak was broader than that of the theoretical curve expected from the probe geometry. In order to explain this disagreement, we consider the effect of sheath in the vicinity of the Rogowski probe. A sheath model was constructed and electron orbits were numerically calculated. From the calculation, it was found that the electron orbit is affected by E × B drift due to the sheath electric field. Such orbit causes the broadening of the peak in the angular dependence and the dependence agrees with the experimental results. The dependence of the broadening on various plasma parameters was studied numerically and explained qualitatively by a simplified analytical model.
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Furui
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Ejiri
authors.affiliation: Kyushu University, Kasuga 816-8680, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nagashima
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Takase
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Sonehara
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Tsujii
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamaguchi
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Shinya
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Togashi
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Homma
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nakamura
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Takeuchi
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yajima
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yoshida
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Toida
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: W
authors.initials: W
authors.lastname: Takahashi
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yamazaki