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New X-mode reflectometry measurements of Alfvén Eigenmodes on JET

S. Hacquin
S. Sharapov
L. Meneses
B. Alper
C. Challis
L. Cupido
A. Fonseca
A. Meigs
I. Nunes
S. Pinches
L. Prat
The Jet Efda Contributors

Publication date

December 2014

Abstract

It was shown in recent works [1,2] that O-mode reflectometry is a powerful diagnostic to determine the time-frequency evolution of Alfvén Eigenmodes (AEs) on the JET tokamak. Due to the fact that the density profile is generally flat in the plasma core region where the AEs are localised, the best way of detecting these modes was to use a probing wave wit

Extracted data

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Villard, L.
de Ridder, G.

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There is not yet a straightforward method for determining the D-T ratio in the centre of a tokamak p...

Identification of the Alfvén wave resonances in the TCABR tokamak by the microwave reflectometry

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Galvão, R. M. O.
Lerche, E. A.
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Bellintani Jr, V.
Elizondo, J. I.
Fagundes, A. N.
Fonseca, A. M. M.
Kuznetsov, Yu. K.
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Sá, W. P. de
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Silva, R. P. da
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The experimental results on the Alfvén mode structure identification by the microwave reflectometry ...

The upgraded JET toroidal Alfvén eigenmode diagnostic system

January 2016

The main characteristics of toroidal Alfven eigenmodes (TAEs) have been successfully investigated in...

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Nocente, M.
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Various types of Alfven eigenmodes (AEs) have been destabilized by fast ions over a broad frequency ...

The upgraded JET toroidal Alfven eigenmode diagnostic system

Puglia, P.
Pires De Sa, W.
Blanchard, P.
Dorling, S.
Dowson, S.
Fasoli, A.
Figueiredo, J.
Galvao, R.
Graham, M.
Jones, G.
Von Thun, C. Perez
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Ruchko, L.
Testa, D.
Woskov, P.
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February 2017

The main characteristics of toroidal Alfven eigenmodes (TAEs) have been successfully investigated in...

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Sharapov, S. E.
Alper, B.
Fessey, J.
Hawkes, N. C.
Young, N. P.
Nazikian, R.
Kramer, G. J.
Borba, D. N.
Hacquin, S.
De La Luna, E.
Pinches, S. D.
Rapp, J.
Testa, D.

April 2008

A microwave interferometry technique is applied for the first time for detecting a discrete spectrum...

Identifying Alfven eigenmodes in the early phase of advanced tokamak plasmas

HASH(0x558e7bb459b0)

We examine the fast-ion driven Alfven eigenmodes (AEs) in the frequency range 0-500 kHz during the c...

Active excitation and damping rate measurement of intermediate-n

Toroidal Alfvén
Eigenmodes Jet
Mast Plasmas

September 2016

The stability properties of Alfvén Eigenmodes (AEs) are investigated directly using external antenna...

Real-Time Measurements of Damping Rates and Instability Limits for MHD Modes on the JET Tokamak

January 2015

The linear stability properties of plasma collective modes is investigated in the JET tokamak using ...

MHD spectroscopy through detecting toroidal Alfven eigenmodes and Alfven wave cascades

Sharapov, S.
Testa, D.
Alper, B. (and others)
European Fusion Development Agreement (EFDA), Abingdon (United Kingdom)
Commission of the European Communities, Abingdon (United Kingdom). JET Joint Undertaking

January 2001

Toroidal Alfven Eigenmodes and a new class of modes, the Alfven cascades, excited by energetic ions ...

Characterization of Alfvén eigenmodes using NBI during current ramp-up in the ASDEX Upgrade tokamak

S da Graça
Conway, G. D.
Lauber, P.
Curran, D.
Igochine, V.
Classen, I.G.J.
M. García-Muñoz
Stober, J.
VanZeeland, M. A.
Manso, M. E.
ASDEX Upgrade Team

January 2012

Alfvén cascades (ACs) and beta-induced Alfvén eigenmodes (BAEs) have been studied in the ASDEX Upgra...

Alfvén eigenmodes measured in the TJ-II stellarator

Jimenez-Gomez, R
Konies, Axel
Ascasibar, E
Castejon, F.
Estrada, T.
Eliseev, L. G.
Melnikov, A. V.
Jimenez, J.A.
Pretty, David
Jimenez-Rey, D.
Pedrosa, M.A.
de Bustos, A.
Yamamoto, S.

February 2016

High frequency modes (150-300 kHz) are found in several magnetic configurations of TJ-II plasmas hea...

A novel measurement of marginal Alfven eigenmode stability during high power auxiliary heating in JET

Tinguely, R. A.
Fil, N.
Puglia, P. G.
Dowson, S.
Porkolab, M.
Guillemot, V
Podesta, M.
Baruzzo, M.
Dumont, R.
Fasoli, A.
Fitzgerald, M.
Kazakov, Ye O.
Nave, M. F. F.
Nocente, M.
Ongena, J.
Sharapov, S. E.
Stancar, Z.

May 2022

The interaction of Alfven eigenmodes (AEs) and energetic particles is one of many important factors ...

On the use of MHD mode analysis as a technique for determination of q-profiles in JET plasmas

Nave, M. F. F.
Alper, B.
Mailloux, J.
de la Luna, E.
Smeulders, P.
Borba, D.
Boswell, C.
Challis, C.
Brix, M.
Gerasimov, S.
Hacquin, S.
Hawkes, N.
Jofrin, E.

January 2004

JET plasmas show fluctuations from a large variety of MHD instabilities. A combination of spectral a...

Optimization of the active MHD spectroscopy system on JET for the excitation of individual intermediate and high-n Alfven eigenmodes

Panis, T.
Testa, D.
Fasoli, A.
Klein, A.
Carfantan, H.
Blanchard, P.

July 2010

The stability of Alfven eigenmodes (AEs) is studied experimentally in the JET tokamak by observing t...

Measurement of the effective plasma ion mass in large tokamaks using global Alfven eigenmodes

Lister, J. B.
Villard, L.
de Ridder, G.

April 2008

There is not yet a straightforward method for determining the D-T ratio in the centre of a tokamak p...

Identification of the Alfvén wave resonances in the TCABR tokamak by the microwave reflectometry

Ruchko, L. F.
Galvão, R. M. O.
Lerche, E. A.
Elfimov, A. G.
Bellintani Jr, V.
Elizondo, J. I.
Fagundes, A. N.
Fonseca, A. M. M.
Kuznetsov, Yu. K.
Nascimento, I. C.
Sá, W. P. de
Sanada, E.
Silva, R. P. da
Valencia, R.

December 2004

The experimental results on the Alfvén mode structure identification by the microwave reflectometry ...