Observations of core ion cyclotron emission on ASDEX Upgrade tokamak

Research output: Contribution to journalConference article – Annual report year: 2018Researchpeer-review

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DOI

  • Author: Ochoukov, R.

    Max Planck Institute for Plasma Physics, Germany

  • Author: Bobkov, V.

    Max Planck Institute for Plasma Physics, Germany

  • Author: Chapman, E.

    University of Warwick, United Kingdom

  • Author: Dendy, R.O.

    University of Warwick, United Kingdom

  • Author: Dunne, Lynsey

    Max Planck Institute for Plasma Physics, Germany

  • Author: Faugel, H.

    Max Planck Institute for Plasma Physics, Germany

  • Author: Garcia-Munoz, M.

    University of Seville, Spain

  • Author: Geiger, Dieter

    Max Planck Institute for Plasma Physics, Germany

  • Author: Hennequin, Y.

    Ecole Polytechnique, France

  • Author: McClements, K.G.

    Culham Science Centre, United Kingdom

  • Author: Moseev, D

    Max Planck Institute for Plasma Physics, Germany

  • Author: Nielsen, L.

    Technical University of Denmark, Denmark

  • Author: Rasmussen, A.N.

    Plasma Physics and Fusion Energy, Department of Physics, Technical University of Denmark, Fysikvej, 2800, Kgs. Lyngby, Denmark

  • Author: Schneider, Andreas

    Max Planck Institute for Plasma Physics, Germany

  • Author: Weiland, J.

    Max Planck Institute for Plasma Physics, Germany

  • Author: Noterdaeme, J.-M.

    Max Planck Institute for Plasma Physics, Germany

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The B-dot probe diagnostic suite on the ASDEX Upgrade tokamak has recently been upgraded with a new 125 MHz, 14 bit resolution digitizer to study ion cyclotron emission (ICE). While classic edge emission from the low field side plasma is often observed, we also measure waves originating from the core with fast fusion protons or beam injected deuterons being a possible emission driver. Comparing the measured frequency values with ion cyclotron harmonics present in the plasma places the origin of this emission on the magnetic axis, with the fundamental hydrogen/second deuterium cyclotron harmonic matching the observed values. The actual values range from ∼27 MHz at the on-axis toroidal field BT = -1.79 T to ∼40 MHz at BT = -2.62 T. When the magnetic axis position evolves during this emission, the measured frequency values track the changes in the estimated on-axis cyclotron frequency values. Core ICE is usually a transient event lasting ∼100 ms during the neutral beam startup phase. However, in some cases, core emission occurs in steady-state plasmas and lasts for longer than 1 s. These observations suggest an attractive possibility of using a non-perturbing ICE-based diagnostic to passively monitor fusion alpha particles at the location of their birth in the plasma core, in deuterium-tritium burning devices such as ITER and DEMO.
Original languageEnglish
Article number10J101
JournalReview of Scientific Instruments
Volume89
Issue number10
Number of pages5
ISSN0034-6748
DOIs
Publication statusPublished - 2018
Event 22nd Topical Conference on High-Temperature Plasma Diagnostics - San Diego, United States
Duration: 15 Apr 201819 Apr 2018

Conference

Conference 22nd Topical Conference on High-Temperature Plasma Diagnostics
CountryUnited States
CitySan Diego
Period15/04/201819/04/2018
CitationsWeb of Science® Times Cited: No match on DOI

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