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Assessment of the effects of scrape-off layer fluctuations on first wall sputtering with the TOKAM-2D turbulence code

机译:评估涂布层波动与TOKAM-2D湍流码的第一壁溅射效应

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摘要

Plasma material interactions on the first wall of future tokamaks such as ITER and DEMO are likely to play an important role, because of turbulent radial transport. The latter results to a large extent from the radial propagation of plasma filaments through a tenuous background. In such a situation, mean field descriptions (on which transport codes rely) become questionable. First wall sputtering is of particular interest, especially in a full W machine, since it has been shown experimentally that first wall sources control core contamination. In ITER, beryllium sources will be one of the important actors in determining the fuel retention level through codeposition. In this work, we study the effect of turbulent fluctuations on mean sputtering yields and fluxes, relying on a new version of the TOKAM-2D code which includes ion temperature fluctuations. We show that fluctuations enhance sputtering at sub-threshold impact energies, by more than an order of magnitude when fluctuation levels are of order unity.
机译:由于湍流的径向运输,在未来的托克马克斯的第一墙上的等离子体材料相互作用可能发挥重要作用。后者在很大程度上导致血浆长丝通过脆弱背景的径向繁殖。在这种情况下,平均场描述(依赖哪个传输代码)变得可疑。第一壁溅射特别感兴趣,特别是在全W机器中,因为它已经通过实验示出了第一壁源控制芯污染。在ITER中,铍源将是通过译剂确定燃料保留水平的重要作用者之一。在这项工作中,我们研究了湍流波动对平均溅射产量和助熔剂的影响,依赖于托克马-2D代码的新版本,包括离子温度波动。我们表明,当波动水平为单位时,波动增强了亚阈值冲击能量的溅射,超过了数量级。

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