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首页> 外文期刊>Plasma physics and controlled fusion >Impurity behaviour in the ASDEX Upgrade divertor tokamak with large area tungsten walls
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Impurity behaviour in the ASDEX Upgrade divertor tokamak with large area tungsten walls

机译：具有大面积钨壁的ASDEX升级分流器托卡马克中的杂质行为

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At the central column of ASDEX Upgrade, an area of 5.5 m(2) of graphite tiles was replaced by tungsten-coated tiles representing about two-thirds of the total area of the central column. No negative influence on the plasma performance was found, except for internal transport barrier limiter discharges. The tungsten influx Gamma(W) stayed below the detection limit only during direct plasma wall contact or for reduced clearance in divertor discharges spectroscopic evidence for Gamma(W) could be found. From these observations a penetration factor of the order of 1% and effective sputtering yields of about 10(-3) could be derived, pointing to a strong contribution by light intrinsic impurities to the total W-sputtering. The tungsten concentrations ranged from below 10(-6) up to a few times 10(-5). Generally, in discharges with increased density peaking, a tendency for increased central tungsten concentrations or even accumulation was observed. Central heating (mostly) by ECRH led to a strong reduction of the central impurity content, accompanied by a very benign reduction of the energy confinement. The observations suggest that the W-source strength plays only an inferior role for the central W-content compared to the transport, since in the discharges with increased W-concentration neither an increase in the W-influx nor a change in the edge parameters was observed. In contrast, there is strong experimental evidence, that the central impurity concentration can be controlled externally by central heating. [References: 37]
机译：在ASDEX升级中心柱上，一块5.5 m（2）的石墨砖被钨涂层砖所代替，占中心柱总面积的三分之二。除了内部传输屏障限制器放电外，未发现对等离子体性能的负面影响。钨流入量Gamma（W）仅在直接等离子壁接触期间或在偏滤器放电中间隙减小时才保持在检测极限以下，可以找到Gamma（W）的光谱学证据。从这些观察中，可以得出大约1％的渗透系数和大约10（-3）的有效溅射产率，表明光固有杂质对整个W溅射有很大贡献。钨的浓度范围从低于10（-6）到几倍10（-5）。通常，在密度峰值增加的放电中，观察到中心钨浓度升高甚至积累的趋势。 ECRH的集中供热（主要是）导致了中央杂质含量的大幅降低，同时伴随着能量限制的非常良性的降低。观察结果表明，与传输相比，W源强度仅对中心W含量起着次要作用，因为在W浓度增加的放电中，W流入量没有增加，边缘参数也没有变化。观测到的。相反，有强有力的实验证据表明，可以通过集中加热从外部控制中心杂质浓度。 [参考：37]

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