Radial electric field measurement in a tokamak with magnetic field ripple

E. Trier; L. G. Eriksson; P. Hennequin; C. Fenzi; C. Bourdelle; G. Falchetto; X. Garbet; T. Aniel; F. Clairet; R. Sabot

doi:10.1088/0029-5515/48/9/092001

Radial electric field measurement in a tokamak with magnetic field ripple

E. Trier
, L. G. Eriksson
, P. Hennequin
, C. Fenzi
, C. Bourdelle
, G. Falchetto
, X. Garbet
, T. Aniel
, F. Clairet
, R. Sabot

CEA Cadarache

Research output: Contribution to journal › Article › peer-review

Abstract

In the regions of the Tore Supra tokamak with significant ripple it is expected that a radial electric field (E_r) ensures the ambipolarity of fluxes of thermal particles trapped in ripple wells. A neoclassical calculation (Connor and Hastie 1973 Nucl. Fusion 13 221, Stringer 1972 Nucl. Fusion 12 689) shows that E_r is related to ion temperature and density gradients. The validity of this relation is investigated in a series of Tore Supra L-mode discharges without external momentum input. Doppler reflectometry measurements of fluctuations perpendicular velocity, which is dominated by the E_r × B drift, are found to be in good agreement with the predicted neoclassical E_r.

Original language	English
Article number	092001
Journal	Nuclear Fusion
Volume	48
Issue number	9
DOIs	https://doi.org/10.1088/0029-5515/48/9/092001
Publication status	Published - 1 Sept 2008

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title = "Radial electric field measurement in a tokamak with magnetic field ripple",

abstract = "In the regions of the Tore Supra tokamak with significant ripple it is expected that a radial electric field (Er) ensures the ambipolarity of fluxes of thermal particles trapped in ripple wells. A neoclassical calculation (Connor and Hastie 1973 Nucl. Fusion 13 221, Stringer 1972 Nucl. Fusion 12 689) shows that Er is related to ion temperature and density gradients. The validity of this relation is investigated in a series of Tore Supra L-mode discharges without external momentum input. Doppler reflectometry measurements of fluctuations perpendicular velocity, which is dominated by the Er × B drift, are found to be in good agreement with the predicted neoclassical Er.",

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AU - Trier, E.

AU - Eriksson, L. G.

AU - Hennequin, P.

AU - Fenzi, C.

AU - Bourdelle, C.

AU - Falchetto, G.

AU - Garbet, X.

AU - Aniel, T.

AU - Clairet, F.

AU - Sabot, R.

PY - 2008/9/1

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N2 - In the regions of the Tore Supra tokamak with significant ripple it is expected that a radial electric field (Er) ensures the ambipolarity of fluxes of thermal particles trapped in ripple wells. A neoclassical calculation (Connor and Hastie 1973 Nucl. Fusion 13 221, Stringer 1972 Nucl. Fusion 12 689) shows that Er is related to ion temperature and density gradients. The validity of this relation is investigated in a series of Tore Supra L-mode discharges without external momentum input. Doppler reflectometry measurements of fluctuations perpendicular velocity, which is dominated by the Er × B drift, are found to be in good agreement with the predicted neoclassical Er.

AB - In the regions of the Tore Supra tokamak with significant ripple it is expected that a radial electric field (Er) ensures the ambipolarity of fluxes of thermal particles trapped in ripple wells. A neoclassical calculation (Connor and Hastie 1973 Nucl. Fusion 13 221, Stringer 1972 Nucl. Fusion 12 689) shows that Er is related to ion temperature and density gradients. The validity of this relation is investigated in a series of Tore Supra L-mode discharges without external momentum input. Doppler reflectometry measurements of fluctuations perpendicular velocity, which is dominated by the Er × B drift, are found to be in good agreement with the predicted neoclassical Er.

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DO - 10.1088/0029-5515/48/9/092001

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SN - 0029-5515

VL - 48

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 9

M1 - 092001

ER -

Radial electric field measurement in a tokamak with magnetic field ripple

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