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Toroidal rotation and ion heating during neutral beam injection in PBX-M

N. Asakura, R.J. Fonck, K.P. Jaehnig, S.M. Kaye, B. LeBlanc, M. Okabayashi1993年被引用 38Nuclear FusionIF 3出版社

Determination of the profiles of the ion temperature and the plasma toroidal rotation has been accomplished by charge exchange recombination spectroscopy in PBX-M. The angular momentum and the thermal ion energy transport have been studied mainly during the H mode phase of a high βp discharge (Ip ≈ 330 kA, 3.5 × 1019 ⩽ ne ⩽ 6.5 × 1019 m-3) having different heating beam configurations (combination of two perpendicular and two tangential neutral beam injections, abbreviated as 2 perp. NBI and 2 parall. NBI). The toroidal rotation velocity Vϕ rises substantially in the region of r/a ⩾ 0.5 after the L-H transition, and the Vϕ profile (peakedness) is more highly dependent on the beam configuration than the Ti profile. The angular momentum confinement time varies from 147 ms (rigid rotation for 2 perp. NBI) to 39 ms (viscous rotation for 2 parall. NBI). In contrast, the thermal energy confinement time is 44-48 ms and is almost independent of the configuration. The transport analysis shows that the radial angular momentum diffusion is caused mainly by the viscous losses and that the angular momentum diffusivity χϕ is reduced substantially in the outer minor radius region during the 2 perp. NBI H mode. The neoclassical friction effect between the bulk ions and the impurities may influence the χϕ profiles locally, where the ion temperature gradient is steep

日本語訳

PBX-Mにおける荷電交換再結合分光法により、イオン温度とプラズマトロイダル回転の分布の測定が達成された。角運動量および熱イオンエネルギーの輸送は、主に高βp放電(Ip ≈ 330 kA、3.5 × 10¹⁹ ⩽ ne ⩽ 6.5 × 10¹⁹ m⁻³)のHモード相において、異なる加熱ビーム構成(2本の垂直中性粒子ビーム入射と2本の接線中性粒子ビーム入射の組み合わせ、それぞれ2 perp. NBIおよび2 parall. NBIと略記)で研究された。トロイダル回転速度Vϕは、L-H遷移後にr/a ⩾ 0.5の領域で顕著に上昇し、Vϕ分布(尖鋭度)はTi分布よりもビーム構成に強く依存する。角運動量閉じ込め時間は147 ms(2 perp. NBIでの剛体回転)から39 ms(2 parall. NBIでの粘性回転)まで変化する。対照的に、熱エネルギー閉じ込め時間は44〜48 msであり、構成にほぼ依存しない。輸送解析により、径方向の角運動量拡散は主に粘性損失によって引き起こされ、角運動量拡散係数χϕは2 perp. NBI Hモード中に外側小半径領域で大幅に減少することが示された。バルクイオンと不純物間の新古典摩擦効果は、イオン温度勾配が急峻な領域においてχϕ分布に局所的に影響を与える可能性がある。

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Neutral beamNeutral beam injectionToroidal rotationIon heatingPBX-M
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