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Characterisation of the properties of a negative hydrogen ion beam by several beam diagnostic techniques

R. Maurizio, U. Fantz, F. Bonomo, G. Serianni2016年被引用 15Nuclear FusionIF 3出版社

The beam properties of the BATMAN negative ion source, which is the prototype of one module of the source for the ITER neutral beam injection system, are characterised by means of three diagnostic techniques: beam emission spectroscopy (BES), the experimental calorimeter mini-STRIKE and a copper calorimeter. The main beam parameters—beam divergence, homogeneity and top–bottom asymmetries—are studied in different operational scenarios: with different magnetic filter field setups, source settings and with different gases (hydrogen or deuterium). Among all dependences, the influence of the magnetic field configuration on the beam and the evolution of the beam features during some conditioning days are investigated in detail. Data show that the stronger the filter field in the beam region, the higher the beam top–bottom asymmetry—likely a effect. During the conditioning of the source, such vertical beam asymmetry increases as well, suggesting an inhomogeneous H−production at the first grid of the extraction system.

日本語訳

BATMAN負イオン源は、ITER中性粒子入射装置の1モジュールの原型であり、そのビーム特性は、ビーム放射分光法(BES)、実験用カロリメータmini-STRIKE、および銅カロリメータの3つの診断手法によって特徴づけられる。主なビームパラメータ(ビーム発散、均一性、上下非対称性)は、異なる動作シナリオ(異なる磁気フィルター場の設定、ソース設定、異なるガス(水素または重水素))において研究される。すべての依存性の中で、磁場配置がビームに及ぼす影響と、いくつかのコンディショニング日数におけるビーム特性の変化が詳細に調査される。データは、ビーム領域におけるフィルター場が強いほど、ビームの上下非対称性が高くなることを示しており、これはおそらく〜の効果である。ソースのコンディショニング中、このような垂直方向のビーム非対称性も増大し、抽出系の第1グリッドにおけるH−生成が不均一であることを示唆している。

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Plasma diagnosticsIon beamsNegative hydrogen
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