Magnetic probe array with high sensitivity for fluctuating field.
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.
Kanamaru
Yuki
Y
College of Science and Technology, Nihon University, Tokyo 101-8308, Japan.
Gota
Hiroshi
H
Fujimoto
Kayoko
K
Ikeyama
Taeko
T
Asai
Tomohiko
T
Takahashi
Tsutomu
T
Nogi
Yasuyuki
Y