Runaway electron generation during plasma shutdown by killer pellet injection

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چکیده

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Runaway electron generation during plasma shutdown by killer pellet injection

Tokamak discharges are sometimes terminated by disruptions that may cause large mechanical and thermal loads on the vessel. To mitigate disruption-induced problems it has been proposed that “killer” pellets could be injected into the plasma in order to safely terminate the discharge. Killer pellets enhance radiative energy loss and thereby lead to rapid cooling and shutdown of the discharge. Bu...

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Disruptions in a large tokamak can cause serious damage to the device and should be avoided or mitigated. Massive gas or killer pellet injection are possible ways to obtain a controlled fast plasma shutdown before a natural disruption occurs. In this work, plasma shutdown scenarios with different types of impurities are studied for an ITER-like plasma. Plasma cooling, runaway generation and the...

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Recent ECRH experiments in FTU have provided new results in two plasma scenarios, both characterized by the absence of the sawtooth activity and by flat or reversed q profiles. The first is the current ramp-up phase where low density plasmas have been heated up to high electron temperature. When the heating is localized on the plasma axis, the high additional power density has produced the evid...

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ژورنال

عنوان ژورنال: Plasma Physics and Controlled Fusion

سال: 2008

ISSN: 0741-3335,1361-6587

DOI: 10.1088/0741-3335/50/5/055006