A locked mode indicator for disruption prediction on JET and ASDEX upgrade

Giuliana Sias (Corresponding Author), B. Cannas, A. Fanni, A. Murari, A. Pau, Leena Aho-Mantila, Antti Hakola, Juuso Karhunen, Antti Salmi, Tuomas Tala, Antti Hakola, Aki Lahtinen, Markus Airila, Aaro Jarvinen, Seppo Koivuranta, Jari Likonen, Paula Sirén, ASDEX Upgrade Team, EUROfusion MST1 Team, JET Contributors

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)


    The aim of this paper is to present a signal processing algorithm that, applied to the raw Locked Mode signal, allows us to obtain a disruption indicator in principle exploitable on different tokamaks. A common definition of such an indicator for different machines would facilitate the development of portable systems for disruption prediction, which is becoming of increasingly importance for the next tokamak generations. Moreover, the indicator allows us to overcome some intrinsic problems in the diagnostic system such as drift and offset. The behavior of the proposed indicator as disruption predictor, based on crossing optimized thresholds of the signal amplitude, has been analyzed using data of both JET and ASDEX Upgrade experiments. A thorough analysis of the disruption prediction performance shows how the indicator is able to recover some missed and tardy detections of the raw signal. Moreover, it intervenes and corrects premature or even wrong alarms due to, e.g., drifts and/or offsets.
    Original languageEnglish
    Pages (from-to)254-266
    JournalFusion Engineering and Design
    Publication statusPublished - 1 Jan 2019
    MoE publication typeA1 Journal article-refereed


    • Disruption indicators
    • Disruption prediction
    • Feature extraction
    • Locked mode signal
    • Tokamak


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