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Are talking about ELMs? Isn't it a basically solved problem then? I was under impression that between KSTAR's active field disruption coils and pellet injection
by lambdadmitry 8y ago
Are talking about ELMs? Isn't it a basically solved problem then? I was under impression that between KSTAR's active field disruption coils and pellet injection they are more or less controlled (and we'll have confirmation from MAST Upgrade quite soon). Or am I wrong?
- pfdietz 8y agoNo, disruptions are catastrophic events where confinement is lost very rapidly. As the plasma cools an electric field builds up from the decaying current, and this field can accelerate runaway electrons in narrow beams to relativistic energies. Worst case >70% of the stored magnetic energy from the current in the plasma gets dumped into these electrons. If they hit the wall they can explode a hole in it. https://en.m.wikipedia.org/wiki/Tokamak#Plasma_disruptions https://en.m.wikipedia.org/wiki/Tokamak#Plasma_disruptions
- lambdadmitry 8y agoAh, I see. It looks they did something about it though https://www.iter.org/newsline/-/3183 https://www.iter.org/newsline/-/3183 are you skeptical that that can work?
- pfdietz 8y agoSome disruptions occur almost instantly. The system will have very little time to react. And how are they going to train or test it? A single unmitigated disruption will damage the reactor. https://wsx.lanl.gov/Disruptions/Disruption-Risk-poster-Wurden-LAUR-11-11465.pdf https://wsx.lanl.gov/Disruptions/Disruption-Risk-poster-Wurd... https://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-17-24821 https://permalink.lanl.gov/object/tr?what=info:lanl-repo/lar...