Results from the Alfvén Eigenmode Active Diagnostic during the 2019-2020 JET deuterium campaign

Tinguely, R. A.; Puglia, P. G.; Fil, N.; Dowson, S.; Porkolab, M.; Fasoli, A.; Testa, D.

doi:10.1088/1361-6587/aba7f7

Title: Results from the Alfvén Eigenmode Active Diagnostic during the 2019-2020 JET deuterium campaign

Journal Article · Fri Sep 18 00:00:00 EDT 2020 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/aba7f7· OSTI ID:1897186

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

^[2]; Testa, D. ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)

This paper presents results of extensive analysis of mode excitation observed during the operation of the Alfvén Eigenmode Active Diagnostic (AEAD) in the JET tokamak during the 2019-2020 deuterium campaign. Here, six of eight toroidally spaced antennas, each with independent power and phasing, were successful in actively exciting stable MHD modes in 479 plasmas. In total, magnetic resonances were detected with up to fourteen fast magnetic probes. In this work, we present the calculations of resonant frequencies $$f_0$$, damping rates γ < 0, and toroidal mode numbers $$\textit{n}$$, spanning the parameter ranges $$f_0$$ ≈ 30–250 kHz, –γ ≈ 0–13 kHz, and $$\vert n \vert \leq {30}$$. In general, good agreement is seen between the resonant and the calculated toroidal Alfvén Eigenmode frequencies, and between the toroidal mode numbers applied by the AEAD and estimated of the excited resonances. We note several trends in the database: the probability of resonance detection decreases with plasma current and external heating power; the normalized damping rate increases with edge safety factor but decreases with external heating. These results provide key information to prepare future experimental campaigns and to better understand the physics of excitation and damping of Alfvén Eigenmodes in the presence of alpha particles during the upcoming DT campaign, thereby extrapolating with confidence to future tokamaks.

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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); Euratom

Contributing Organization:: JET Contributors

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

OSTI ID:: 1897186

Alternate ID(s):: OSTI ID: 1660783

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 62, Issue 11; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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