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Yuusuke YAMAGUCHI,A. Fukuyama,H. Nakajima,H. Higaki,K. Nakagome,K. Nemoto,M. Katano,M. Ichimura,S. Kakimoto,T. Cho 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
A wide-band radio-frequency (RF) probe system was newly constructed for the active diagnostic of the eigenmode formations in the ion-cyclotron range of frequencies in the GAMMA 10 tandem mirror. A bar-type antenna was installed in the peripheral region in the minimum-B anchor cell. A low-power RF pulse with the frequency sweep from 8 to 20 MHz is applied to the antenna. The waves excited in the plasma are detected with a magnetic probe. The excitation of eigenmodes is described by using the antenna-plasma-probe transfer function. The transfer function can be obtained from the antenna current signal and the magnetic probe signal. When the real and the imaginary part of the transfer function are plotted in the complex plane, the resultant curves are approximately circles, indicating an eigenmode formation. It is found that the several fast wave eigenmodes can be excited in the present experimental condition.
atsushi Kojima,A. Itakura,H. Kakiuchi,H. Higaki,K. Ishii,M. Ichimura,M. Yoshikawa,N. Kaidou,S. Fujimoto,T. Cho,T. Yamaguchi,Y. Miyata 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The radial particle flux induced by drift-type fluctuations is observed by use of a gold neutral beam probe in the tandem mirror GAMMA 10. When the drift waves are excited in the plasma, the measured phase difference between the density and potential fluctuations is not zero; the radial profile of the phase difference is not constant. This showed that the radial particle flux had some profile and then the density profile would be varied due to the radial particle transport induced by the fluctuations through the radial particle flux. Experimental results showed the density reduction due to the transport induced by the drift-type fluctuations. The phase difference is an important parameter to decide the radial particle flux. The profiles of the phase difference are measured to understand the decision mechanism of the phase difference. The radial profile of the phase difference is varied by the ion heating power, the density and the potential profiles. As a result, the phase difference had a correlation with the difference between the local drift frequency (the electron diamagnetic drift frequency and the E×B drift frequency) and the observed frequency.
Density fluctuation measurements in the tandem mirror GAMMA 10
masayuki Yoshikawa,A. Nakahara,A. Itakura,H. Hojo,H. Higaki,N. Yanagi,T. Kobayashi,T. Cho,Y. Shima 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Fluctuation in the plasma needs to be measured for studying the improvement of the plasma confinement by the formation of the plasma confinement potential. A newly constructed multichannel microwave interferometer and ultrashort-pulse reflectometry were used for measuring the line integrated plasma density profile and density fluctuation profile in a few plasma shots. The first results of density and density fluctuation measurements in the central cell of the tandem mirror GAMMA 10 are described by using the multi-channel interferometer and ultrashort-pulse reflectometry.
High-Power ECRH Experiments in the GAMMA 10 Tandem Mirror
yoshinori Tatematsu,A. Itakura,D. Nagai,H. Higaki,H. Hojo,I. Katanuma,J. Kohagura,K. Nozaki,K. Sakamotoa,K. Ishii,M. Ichimura,M. Yoshikawa,M. Hirata,M. K. Islam,N. Machida,O. Watanabe,T. Imai,T. Numak 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Power-up of gyrotrons was carried out and corresponding launcher systems were designed for plug and central-cell ECRH systems in the GAMMA 10 tandem mirror. Then, a high-power ECRH experiment was started. For the plug ECRH, new 500-kW gyrotrons produced a new record value of the confining potential. For the central-cell ECRH, development of a new antenna system has increased the transmission rate of incident microwave power and focused it onto the machine axis in the resonance surface. As a result, a clear increase of the diamagnetism was observed during the pulse of ECRH.
An Assistant System for Riding a Unicycle
M. Iwase,Y. Kanai,M. Kinoshita,S. Hatakeyama,Y. Kashimura,I. Hanazaki,T. Yokoyama,H. Higaki,K. Fujisawa 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2007 International Journal of Assistive Robotics and Me Vol.8 No.1
The final purpose of this study is to design a control system to assist in the skill of riding a unicycle. To realize such a system, it is necessary to make a mathematical model and to analyze the dynamics of the unicycle. It is ideal that the dynamics of a unicycle is kept as original as possible even if any automatic support control is required to assist the operator. Thus, this paper presents modeling of the unicycle and a control system design by the controlled Lagrangian to realize this type of controller.