Runaway electron beam control

Daniele Carnevale (Corresponding Author), M. Ariola, G. Artaserse, F. Bagnato, W. Bin, L. Calacci, L. Boncagni, T. Bolzonella, F. Bombarda, P. Buratti, L. Calacci, F. Causa, S. Coda, F. Cordella, J. Decker, B. Duval, B. Esposito, G. Ferrò, O. Ficker, L. GabellieriA. Gabrielli, S. Galeani, C. Galperti, S. Garavaglia, M. Gobbin, M. Gospodarczyk, G. Granucci, A. Havranek, E. Joffrin, M. Lennholm, A. Lier, E. Macusova, F. Martinelli, J.R. Martín-Solís, J. Mlynár, L. Panaccione, G. Papp, M. Passeri, G. Pautasso, Ž. Popovic, C. Possieri, G. Pucella, G. Ramogida, C. Reux, F. Rimini, A. Romano, M. Sassano, U. Sheikh, B. Tilia, G. de Tommasi, O. Tudisco, D. Valcarcel, Antti Hakola, Leena Aho-Mantila, Juuso Karhunen, Aki Lahtinen, Antti Salmi, Tuomas Tala, Markus Airila, Aaro Järvinen, Seppo Koivuranta, Jari Likonen, Paula Sirén, , EUROfusion MST1 Team, JET Contributors

    Research output: Contribution to journalArticleScientificpeer-review

    17 Citations (Scopus)

    Abstract

    Post-disruption runaway electron (RE) beams in tokamaks with large current can cause deep melting of the vessel and are one of the major concerns for ITER operations. Consequently, a considerable effort is provided by the scientific community in order to test RE mitigation strategies. We present an overview of the results obtained at FTU and TCV controlling the current and position of RE beams to improve safety and repeatability of mitigation studies such as massive gas (MGI) and shattered pellet injections (SPI). We show that the proposed RE beam controller (REB-C) implemented at FTU and TCV is effective and that current reduction of the beam can be performed via the central solenoid reducing the energy of REs, providing an alternative/parallel mitigation strategy to MGI/SPI. Experimental results show that, meanwhile deuterium pellets injected on a fully formed RE beam are ablated but do not improve RE energy dissipation rate, heavy metals injected by a laser blow off system on low-density flat-top discharges with a high level of RE seeding seem to induce disruptions expelling REs. Instabilities during the RE beam plateau phase have shown to enhance losses of REs, expelled from the beam core. Then, with the aim of triggering instabilities to increase RE losses, an oscillating loop voltage has been tested on RE beam plateau phase at TCV revealing, for the first time, what seems to be a full conversion from runaway to ohmic current. We finally report progresses in the design of control strategies at JET in view of the incoming SPI mitigation experiments.
    Original languageEnglish
    Article number014036
    JournalPlasma Physics and Controlled Fusion
    Volume61
    Issue number1
    DOIs
    Publication statusPublished - Jan 2019
    MoE publication typeA1 Journal article-refereed
    Event45th EPS Conference on Plasma Physics - Prague, Czech Republic
    Duration: 2 Jul 20186 Jul 2018

    Keywords

    • magnetic confinement
    • plasma control system
    • runaways

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