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Development of Alfvén Ion Cyclotron Fluctuation Measurement by Use of a Gold Neutral Beam Probe in the Tandem Mirror Gamma10

A. Kojima, K. Ishii, Y. Takemura, K. Hagisawa, A. Itakura, M. Ichimura, K. Yatsu

Fusion Science and Technology / Volume 43 / Number 1T / January 2003 / Pages 274-276

Diagnostics /

Published:February 8, 2018

We researched the AIC (Alfvén Ion Cyclotron) instability. A magnetic probe using microchip-inductor is superior to size and easy to handle. In fluctuation measurement using the GNBP (Gold Neutral Beam Probe) the measured fluctuations may not be local density fluctuation because the beam ionization coefficient depends on not only the electron density but also the temperature, and the secondary beam is deflected by the magnetic field fluctuation, and the beam fluctuation is integrated along the beam trajectory. But we found by simulations such as the AIC fluctuation with small amplitude and high frequency these effects may be neglected. In initial experiment, the GNBP detected successfully the AIC fluctuations with high frequencies excited in the core plasma.

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