||Kenichiro Terasaka, S. Yoshimura, M. Y. Tanaka, Observation of high-temperature bubbles in an ECR plasma, Physics of Plasmas, 10.1063/1.5027588, 25, 5, 2018.05, Creation and annihilation of high-temperature bubbles have been observed in an electron cyclotron resonance plasma. The electron temperature in the bubble core is three times higher than that in the ambient region, and the size perpendicular to the magnetic field is much smaller than the plasma diameter. Formation of a bubble accompanies large negative spikes in the floating potential of a Langmuir probe, and the spatiotemporal behavior of the bubble has been visualized with a high-impedance wire grid detector. It is found that the bubble is in a prolate spheroidal shape with the axis along the magnetic field and occurs randomly in time and independently in space..
||K. Terasaka, M. Y. Tanaka, S. Yoshimura, M. Aramaki, Y. Sakamoto, F. Kawazu, K. Furuta, N. Takatsuka, M. Masuda, R. Nakano, Flow structure formation in an ion-unmagnetized plasma: The HYPER-II experiments, Journal of Plasma Physics, http://dx.doi.org/10.1017/S0022377814000695, 81, 01, 345810101-345810109, 2015.01.
||K. Terasaka, S. Yoshimura, Y. Kato, K. Furuta, M. Aramaki, T. Morisaki, M. Y. Tanaka, High-impedance wire grid method to study spatiotemporal behavior of hot electron clump generated in a plasma, Rev. Sci. Instrum., http://dx.doi.org/10.1063/1.4901096, 85, 11, 113503-1-113503-4, 2014.11.
||S. Yoshimura, K. Terasaka, E. Tanaka, M. Aramaki, M. Y. Tanaka, Probability Density Functions of Floating Potential Fluctuations Due to Local Electron Flux Intermittency in a Linear ECR Plasma, JPS conferene proceedings, 015030, 10.7566/JPSCP.1.015030, 1, 015030_1-015030_4, 2014.04.
||K. Terasaka, S. Yoshimura, K. Ogiwara, M. Aramaki, M.Y. Tanaka, Observation of Ion Stream Line Detachment and Onset of Azimuthal Rotation in a Diverging Magnetic Field, IEEE Trans. Plasma Sci. , 10.1109/TPS.2011.2113194, 39, 9, 1, 2011.09.
||K. Terasaka, S. Yoshimura, T. Katahira, K. Ogiwara, M. Aramaki, and M.Y. Tanaka, Self-Calibrated Measurement of Ion Flow Using a Fine Multihole Directional Langmuir Probe, Japanese Journal of Applied Physics, 10.1143/JJAP.49.036101, 49, 036101, 2010.03.
||K. Terasaka, S. Yoshimura, K. Ogiwara, M. Aramaki, and M.Y. Tanaka, Experimental studies on ion acceleration and stream line detachment in a diverging magnetic field, Physics of Plasmas, 10.1063/1.3457139, 17, 7, 072106, 2010.07.