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Toroidal injection angle dependence of EC assisted plasma initiation at DIII-D
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Toroidal injection angle dependence of EC assisted plasma initiation at DIII-D
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Journal Article
Toroidal injection angle dependence of EC assisted plasma initiation at DIII-D
2024
Overview
An experimental scan of the electron cyclotron waves (EC) toroidal injection angle in plasma breakdown is performed at the DIII-D tokamak. The second harmonic, extraordinary mode EC is used for the study. The dependence of ne and Te on the EC injection angle cannot be conclusively drawn from this study due to the large error bars in the ne and Te measurements. On the other hand, high Te data points are observed in some discharges which can be explained by nonlinear heating. The Dα emission measurement shows a clear relation between the breakdown time and the injection angle. An experimental investigation of the cause of the dependence of breakdown delay on the EC injection angle suggests that when the injection angle is oblique, the EC heating after the reflection at the inboard wall may become ineffective and cause the breakdown delay even when the EC heating before and directly upon injection remains effective. A preliminary run of the heat and transport balance code DYON indicates that the obtained dataset is suitable for a quantitative validation of EC absorption models.
Publisher
IOP Publishing
Subject
