Plasma and Fusion Research
Volume 14, 2402036 (2019)
Regular Articles
- Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
- 1)
- Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan
Abstract
High-speed camera measurement was performed for analyses of detached plasma fluctuation in the GAMMA 10/PDX tandem mirror device. Significant spectral peaks at frequencies of 1.5 and 3 kHz were observed to have several local maxima along the vertical, near the entrance of the V-shaped target. Wavelet analysis indicated that 1.5- and 3-kHz fluctuations became non-simultaneously strong. Their phase relationships demonstrated inversion-symmetric and symmetric features with respect to the midplane. Such spectral patterns were interpreted as the line-integral of odd- and even-mode structures. It is suspected that the vertical edge part was due to radially elongated structures with an azimuthal phase shift.
Keywords
fluctuation, plasma detachment, high-speed camera, frequency analysis, GAMMA 10/PDX
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