title: Magnetic probe array with high sensitivity for fluctuating field.
abstract: A magnetic probe array is constructed to measure precisely the spatial structure of a small fluctuating field included in a strong confinement field that varies with time. To exclude the effect of the confinement field, the magnetic probes consisting of figure-eight-wound coils are prepared. The spatial structure of the fluctuating field is obtained from a Fourier analysis of the probe signal. It is found that the probe array is more sensitive to the fluctuating field with a high mode number than that with a low mode number. An experimental demonstration of the present method is attempted using a field-reversed configuration plasma, where the fluctuating field with 0.1% of the confinement field is successfully detected.
authors.affiliation: College of Science and Technology, Nihon University, Tokyo 101-8308, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kanamaru
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Gota
authors.forename: Kayoko
authors.initials: K
authors.lastname: Fujimoto
authors.forename: Taeko
authors.initials: T
authors.lastname: Ikeyama
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Asai
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Takahashi
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Nogi