Papers - SAKODA Tatsuya
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Sakoda T., Miyao T., Uchino K., Muraoka K.
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers 36 ( 11 ) 6981 - 6985 1997.11
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
In order to understand plasma formation processes in a neutral loop discharge, measurements of population densities of excited levels of helium atoms were performed using laser induced fluorescence (LIF) spectroscopy. At the same time, profiles of electron density n e and electron temperature T e were measured using Thomson scattering. The results of these measurements were analyzed using a collisional-radiative model of helium atoms in the plasma. It was found that population densities of excited levels of the helium atoms were consistent with the values of n e and T e . This indicates that it is not necessary to consider an existence of a high energy electron component which may be supposed to theoretically exist in addition to the Maxwellian energy distribution function for the bulk of electrons at the measured temperature T e . Also, it was shown that the energy deposition to electrons in the vicinity of the neutral loop plays a essential role in the formation of the neutral loop discharge plasma.
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Electron temperature and density profiles in a neutral loop discharge plasma
Sakoda T., Iwamiya H., Uchino K., Muraoka K., Itoh M., Uchida T.
Japanese Journal of Applied Physics, Part 2: Letters 36 ( 1 PART A/B ) 1997.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Journal of Applied Physics, Part 2: Letters
Thomson scattering measurements of electron temperature and density in a neutral loop discharge (NLD) plasma were performed in order to reveal electron behavior around the neutral loop. The method yielded unambiguous and reliable results, enabling quantitative analyses of particle balance to be made. The results showed that the electron temperature had a peak on the neutral loop and, in contrast, the electron density had a peak at a position radially inward from the neutral loop. We suggest that charged particles are produced by electron impact ionization of argon atoms on the neutral loop and then flow radially inward. The effect of the magnetic field strength on the NLD plasma formation is also discussed.
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Sakoda Tatsuya, Otsubo Masahisa, Honda Chikahisa, NIEDA Hiroshi
電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society 116 ( 11 ) 953 - 958 1996.11
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：電気学会