Experimental studies of plasma-antenna coupling with the JET Alfvén Eigenmode Active Diagnostic

Tinguely, R. A.; Puglia, P. G.; Fil, N.; Dowson, S.; Porkolab, M.; Dvornova, A.; Fasoli, A.; Fitzgerald, M.; Guillemot, V.; Huysmans, G. T.A.; Maslov, M.; Sharapov, S.; Testa, D.

doi:10.1088/1741-4326/abc7eb

Title: Experimental studies of plasma-antenna coupling with the JET Alfvén Eigenmode Active Diagnostic

Journal Article · Mon Dec 21 00:00:00 EST 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abc7eb· OSTI ID:1850220

^[1]; Puglia, P. G. ^[2]; Fil, N. ^[3]; Dowson, S. ^[3]; Porkolab, M. ^[1]; Dvornova, A. ^[4];

^[2]; Fitzgerald, M. ^[3]; Guillemot, V. ^[5]; Huysmans, G. T.A. ^[4]; Maslov, M. ^[3];

^[3];

^[2]

Massachusetts Institute of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
French Alternative Energies and Atomic Energy Commission (CEA), Saint-Paul-lez-Durance (France)
Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI) (France)

Here, this paper presents a dedicated study of plasma-antenna (PA) coupling with the Alfvén Eigenmode Active Diagnostic (AEAD) in JET. Stable AEs and their resonant frequencies f, damping rates γ < 0, and toroidal mode numbers n are measured for various PA separations and limiter versus X-point magnetic configurations. Two stable AEs are observed to be resonantly excited at distinct low and high frequencies in limiter plasmas. The values of f and n do not vary with PA separation. However, |γ| increases with PA separation for the low-f, but not high-f, mode, yet this may be due to slightly different edge conditions. The high-f AE is detected throughout the transition from limiter to X-point configuration, though its damping rate increases; the low-f mode, on the other hand, becomes unidentifiable. The linear, resistive MHD code CASTOR is used to simulate the frequency scan of an AEAD-like external antenna. For the limiter pulses, the high-f mode is determined to be an n = 0 GAE, while the low-f mode is likely an n = 2 TAE. During the transition from limiter to X-point configuration, CASTOR indicates that n = 1 and 2 EAEs are excited in the edge gap. These results extend previous experimental studies in JET and Alcator C-Mod; validate the computational work performed by Dvornova et al; and provide guidance for the optimization of PA coupling in upcoming JET energetic particle experiments, for which the AEAD will aim to identify the contribution of alpha particles to AE drive during the DT campaign.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Euratom Research and Training Program

Contributing Organization:: JET Contributors

Grant/Contract Number:: FG02-99ER54563; AC02-05CH11231; AC05-00OR22725; 633053

OSTI ID:: 1850220

Journal Information:: Nuclear Fusion, Vol. 61, Issue 2; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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