تقرير
Characteristics of the Alfv\'enic activity during the current quench in ASDEX Upgrade
| العنوان: | Characteristics of the Alfv\'enic activity during the current quench in ASDEX Upgrade |
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| المؤلفون: | Heinrich, P., Papp, G., Lauber, Ph., Pautasso, G., Dunne, M., Maraschek, M., Igochine, V., Linder, O., Team, the ASDEX Upgrade, Team, the EUROfusion Tokamak Exploitation |
| سنة النشر: | 2024 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Plasma Physics |
| الوصف: | ASDEX Upgrade has developed multiple massive gas injection (MGI) scenarios to investigate runaway electron (RE) dynamics. During the current quench of the MGI induced disruptions, Alfv\'enic activity is observed in the 300-800 kHz range. With the help of a mode tracing algorithm based on Fourier spectrograms, mode behaviour was classified for 180 discharges. The modes have been identified as global Alfv\'en eigenmodes using linear gyrokinetic MHD simulations. Changes in the Alfv\'en continuum during the quench are proposed as explanation for the strong frequency sweep observed. A systematic statistical analysis shows no significant connection of the mode characteristics to the dynamics of the subsequent runaway electron beams. In our studies, the appearance and amplitude of the modes does not seem to affect the potential subsequent runaway beam. Beyond the scope of the 180 investigated dedicated RE experiments, the Alfv\'enic activity is also observed in natural disruptions with no RE beam forming. Comment: 15 (+5 Appendix) pages, 15 (+1 Appendix) figures, submitted paper, Additional details on each classification/method openly available in my master's thesis, see http://hdl.handle.net/21.11116/0000-0008-ED5A-9 |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2402.01268 |
| رقم الأكسشن: | edsarx.2402.01268 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |