학술논문
Latest results on quiescent and post-disruption runaway electron mitigation experiments at Frascati Tokamak Upgrade
Document Type
Working Paper
Author
Carnevale, D.; Buratti, P.; Baruzzo, M.; Bin, W.; Bombarda, F.; Boncagni, L.; Paz-Soldan, C.; Calacci, L.; Cappelli, M.; Castaldo, C.; Ceccuzzi, S.; Centioli, C.; Cianfarani, C.; Coda, S.; Cordella, F.; Arcangelo, O. D; Decker, J.; Duval, B.; Esposito, B.; Gabellieri, L.; Galeani, S.; Garavaglia, S.; Galperti, C.; Ghillardi, G.; Granucci, G.; Lenhen, M.; Liuzza, D.; Martinelli, F.; Mazzotta, C.; Napoli, F.; Nardon, E.; Oliva, F.; Panaccione, L.; Passeri, M.; Pucella, G.; Ramogida, G.; Romano, A.; Sassano, M.; Tudisco, O.; team, the Ftu; Team, Eurofusion Mst1
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Subject
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Abstract
Results from the last FTU campaigns on the deuterium large (wrt FTU volume) pellet REs suppression capability, mainly due to the induced burst MHD activity expelling REs seed are presented for discharges with 0.5 MA and 5.3T. Clear indications of avalanche multiplication of REs following single pellet injection on 0.36 MA flat-top discharges is shown together with quantitative indications of dissipative effects in terms of critical electrical field increase due to fan-like instabilities. Analysis of large fan-like instabilities on post-disruption RE beams, that seem to be correlated with low electrical field and background density drops, reveal their strong RE energy suppression capability suggesting a new strategy for RE energy suppression controlling large fan instabilities. We demonstrate how such density drops can be induced using modulated ECRH power on post-disruption beams.
Comment: DRAFT that will be submitted to NF (the conference version is on FEC/IAEA conference 2020)
Comment: DRAFT that will be submitted to NF (the conference version is on FEC/IAEA conference 2020)