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Heavy ion beam probe wavenumber measurements from the TEXT Tokamak edge

T.P. Crowley, P.M. Schoch, J.W. Heard, R.L. Hickok, Xuanzong Yang1992年被引用 25Nuclear FusionIF 3出版社

Spatial correlations and average wavenumbers of fluctuations have been measured in the edge region (0.8 < r/a < 1) of the TEXT tokamak using a heavy ion beam probe. The poloidal correlation length is substantially longer inside the limiter than it is outside. From this result it is concluded that the average wavenumber is smaller inside the limiter than it is outside. The frequency dependence of the average wavenumber also varies with radius, and a shear layer is sometimes observed. The frequency averaged wavenumbers are of the order of 1 cm-1. The statistical phase velocities vary from 2.5 × 105 to 6 × 105 cm/s in this region. The sensitivity to higher wavenumbers was increased by reducing the sample volume size in one experiment, and it was found that the fluctuation level changed by a factor of two while the wavenumber at a given frequency changed by 20%. The measurements are compared with previous results from far infrared scattering and Langmuir probes. The statistical phase velocities obtained with a heavy ion beam probe disagree with those from the other diagnostics in some but not all cases. The observed low frequency statistical phase velocities are comparable to the diamagnetic drift velocity in the laboratory frame in some but not all cases

日本語訳

TEXTトカマクの端部領域(0.8 < r/a < 1)における密度ゆらぎの空間相関と平均波数が、重イオンビームプローブを用いて測定された。ポロイダル方向の相関長は、リミターの内側よりも外側の方が有意に長い。この結果から、平均波数はリミターの内側よりも外側の方が小さいと結論づけられる。平均波数の周波数依存性も半径位置によって変化し、シア層が観測されることもある。周波数平均した波数は1 cm⁻¹のオーダーである。統計的位相速度は、この領域において2.5 × 10⁵ cm/sから6 × 10⁵ cm/sの範囲で変化する。ある実験では、サンプル体積を小さくすることで高波数成分への感度を高めたところ、ゆらぎレベルは2倍に変化し、特定周波数における波数は20%変化することが見出された。これらの測定結果は、遠赤外線散乱およびラングミュアプローブによる過去の結果と比較される。重イオンビームプローブによって得られた統計的位相速度は、他の診断法による結果と一部の場合において一致しない。観測された低周波数の統計的位相速度は、実験室系における反磁性ドリフト速度と一部の場合において comparable である。

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Ion beamsTEXTHeavy ion beamIon beam probe
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