High Field Side Penetr ation Depth Scaling Studies at ASDEX Upgr ade
msra
摘要
In modern tokamak experiments refueling of plasmas by the injection of frozen hydrogen isotope pellets is a promising approach. By injecting the pellets from the magnetic high field side (HFS) a grad B induced drift (1) accelerates the deposited material toward the center of the plasma, hence achieving a higher fuelling efficiency. Therefore the pellet injection system was adapted to HFS in several tokamaks, and this scenario is foreseen to be the main ITER fuelling scheme as well. In order to further improve our understanding of the pellet ablation physics and to facilitate future scaling studies for the next generation of tokamaks, an HFS pellet injection database had been developed based on experimental results obtained at the ASDEX Upgrade tokamak. The database contains the most relevant pellet and plasma parameters determining the pellet ablation, with the aim to complete the already existing international Low Field Side (LFS) database, called the IPADBASE (2). In this contribution a statistical analysis is presented based on the database. Model selection techniques were implemented to determine the statistically relevant parameters concerning the pellet ablation (3), and hence derive an experimental HFS scaling law for the pellet penetration depth using multiple regression analysis. In spite of earlier considerations, the electron density was found to be statistically irrelevant. The HFS Scaling Law of pellet ablation considered here has the following form:
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