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Limit cycle oscillations and L/H transitions from two dimensional mean field momentum transport equations

G.M. Staebler, R.J. Groebner2015年被引用 13Nuclear FusionIF 3出版社

The time evolution of one-dimensional in space mean field particle, energy, toroidal and parallel momentum transport equations are shown to admit limit cycle oscillations (LCOs) or dithering L/H transitions. The LCO is caused by the coupling of parallel and toroidal momentum transport equations but energy and particle transport is also impacted by the oscillations. It is shown that the observed radial profiles of the E × B and poloidal velocities near the separatrix can be understood from the two-dimensional momentum transport properties. Experimental data is used to evaluate the coefficients of a reduced transport model and to demonstrate that the model LCO solutions compare well with measurements of a dithering H-mode.

日本語訳

空間一次元平均場の粒子、エネルギー、トロイダルおよび平行運動量輸送方程式の時間発展は、リミットサイクル振動(LCO)またはディザリングL/H遷移を示すことが示されている。LCOは平行およびトロイダル運動量輸送方程式の結合によって引き起こされるが、エネルギーおよび粒子輸送も振動の影響を受ける。セパラトリックス近傍で観測されるE×Bおよびポロイダル速度の動径分布は、二次元運動量輸送特性から理解できることが示されている。実験データを用いて簡約輸送モデルの係数を評価し、モデルのLCO解がディザリングHモードの測定値とよく一致することを実証している。

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Momentum transport
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