Measurement of toroidal variation in conducted heat loads in locked mode induced disruptions on DIII-D
| Autor: | Eric Hollmann, R. A. Moyer, C.J. Lasnier, Nicolas Jc Commaux, Carlos Paz-Soldan, Daisuke Shiraki, N.W. Eidietis, J.G. Watkins |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 25:102502 |
| ISSN: | 1089-7674 1070-664X |
| Popis: | Locked mode disruptions with a controlled toroidal phase are produced in the DIII-D tokamak by locking to large non-axisymmetric applied magnetic perturbations with different toroidal phases. The disruption conducted heat loads are found to reach almost completely the divertor region, possibly due to not only strong inner leg detachment but also plasma motion and limiting on the outer divertor leg shelf. The outer leg conducted heat loads are found to have a significant toroidal variation of order ±30%, with a dominant n = 1 structure. The heat load phase is shifted from the initial locked mode phase in a way that is approximately consistent with heat loss into the scrape-off layer being enhanced at the mode island O-point outer midplane crossing. These measurements suggest that pre-existing locked modes can affect the conducted heat load structure during the thermal quench by affecting the thermal quench MHD phase. This is consistent with previous MHD simulations which indicated that pre-disruption locke... |
| Databáze: | OpenAIRE |
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