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Modulation of prompt fast-ion loss by applied n = 2 fields in the DIII-D tokamak

M A Van Zeeland, N M Ferraro, W W Heidbrink, G J Kramer, D C Pace, X Chen, T E Evans, R K Fisher, M García-Muñoz, J M Hanson2014年Plasma Physics and Controlled FusionIF 2.2出版社

Energy and pitch angle resolved measurements of escaping neutral beam ions (E ≈ 80 keV) have been made during DIII-D L-mode discharges with applied, slowly rotating, n = 2 magnetic perturbations. Data from separate scintillator detectors (FILDs) near and well below the plasma midplane show fast-ion losses correlated with the internal coil (I-coil) fields. The dominant fast-ion loss signals are observed to decay within one poloidal transit time after beam turn-off indicating they are primarily prompt loss orbits. Also, during application of the rotating I-coil fields, outboard midplane edge density and bremsstrahlung emission profiles exhibit a radial displacement of up to δR ≈ 1 cm. Beam deposition and full orbit modeling of these losses using M3D-C1 calculations of the perturbed kinetic profiles and fields reproduce many features of the measured losses. In particular, the predicted phase of the modulated loss signal with respect to the I-coil currents is in close agreement with FILD measurements as is the relative amplitudes of the modulated losses for the co and counter-current beam used in the experiment. These simulations show modifications to the beam ion birth profile and subsequent prompt loss due to changes in the edge density; however, the dominant factor causing modulation of the losses to the fast-ion loss detectors is the perturbed magnetic field (δB/B ≈ 10−3 in the plasma). Calculations indicate total prompt loss to the DIII-D wall can increase with application of the n = 2 perturbation by up to 7% for co-current injected beams and 3% for counter-current injected beams depending on phase of the perturbation relative to the injected beam.

日本語訳

DIII-D Lモード放電中に印加された、ゆっくりと回転するn = 2磁気摂動を伴う、逃離中性粒子ビームイオン(E ≈ 80 keV)のエネルギーおよびピッチ角分解測定が行われた。プラズマ中間面近傍およびその下方に設置された個別のシンチレータ検出器(FILD)による測定では、内部コイル(Iコイル)磁場と相関する高速イオン損失が観測された。支配的な高速イオン損失信号は、ビーム停止後1ポロイダル通過時間以内に減衰し、これらが主に即時損失軌道であることを示している。また、回転するIコイル磁場の印加中、外部中間面の密度および制動放射発光プロファイルは、最大δR ≈ 1 cmの径方向変位を示した。M3D-C1計算による摂動運動論的プロファイルおよび磁場を用いた、これらの損失のビーム堆積および完全軌道モデリングは、測定された損失の多くの特徴を再現する。特に、Iコイル電流に対する変調損失信号の予測位相は、FILD測定と良好な一致を示し、同様に、同一方向および逆方向入射ビームに対する変調損失の相対振幅も一致する。これらのシミュレーションは、端部密度変化によるビームイオン生成分布の変化とそれに続く即時損失を示すが、高速イオン損失検出器への損失変調の支配的要因は摂動磁場(プラズマ中でδB/B ≈ 10⁻³)である。計算によれば、n = 2摂動の印加により、DIII-D壁への総即時損失は、摂動の入射ビームに対する位相に依存して、同一方向入射ビームで最大7%、逆方向入射ビームで最大3%増加し得る。

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diii-d高精度(タイトル一致)

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