Observations of core ion cyclotron emission on ASDEX Upgrade tokamak.

Autor:	Ochoukov R; Max Planck Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany., Bobkov V; Max Planck Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany., Chapman B; Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL, United Kingdom., Dendy R; Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL, United Kingdom., Dunne M; Max Planck Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany., Faugel H; Max Planck Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany., García-Muñoz M; FAMN Department, Faculty of Physics, University of Seville, 41012 Seville, Spain., Geiger B; Max Planck Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany., Hennequin P; Laboratoire de Physique des Plasmas, Ecole Polytechnique, 91128 Palaiseau, France., McClements KG; CCFE, Culham Science Center, Abingdon, Oxfordshire OX14 3DB, United Kingdom., Moseev D; Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany., Nielsen S; Department of Physics, Technical University of Denmark, Fysikvej, b. 309, DK-2800 Kongens Lyngby, Denmark., Rasmussen J; Department of Physics, Technical University of Denmark, Fysikvej, b. 309, DK-2800 Kongens Lyngby, Denmark., Schneider P; Max Planck Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany., Weiland M; Max Planck Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany., Noterdaeme JM; Max Planck Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany.
Jazyk:	angličtina
Zdroj:	The Review of scientific instruments [Rev Sci Instrum] 2018 Oct; Vol. 89 (10), pp. 10J101.
DOI:	10.1063/1.5035180
Abstrakt:	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 B T = -1.79 T to ∼40 MHz at B T = -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.
Databáze:	MEDLINE
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