Measurement of density fluctuations on the JIPP T-IIU tokamak via an HCN laser scattering |
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| Authors: | T Tetsuka K Kawahata A Nishizawa J Fujita and S Okajima |
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| Institution: | (1) Institute of Plasma Physics, Nagoya University, 464 Nagoya, Japan;(2) Department of Applied Physics, Chubu University, 487 Kasugai, Aichi, Japan |
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| Abstract: | Observation of density fluctuations in tokamak plasmas is important to study the plasma confinement and to perform high power heating of the plasma. We observed the density fluctuations by means of an HCN laser scattering method during rf heating in the ion-cyclotron range of frequency on a tokamak plasma.The density fluctuations at the drift wave frequency are not enhanced so much by the heating, but the frequency spectrum is shifted to higher frequency. The increase of the density fluctuation level during the heating has been observed only in low-frequency region owing to MHD activity. |
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| Keywords: | HCN laser scattering density fluctuation tokamak plasma |
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