First lower hybrid current drive experiments on the West Tokamak

WEST Team

doi:10.1063/5.0014034

First lower hybrid current drive experiments on the West Tokamak

WEST Team

Diagnostics and Control

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

3 Scopus citations

Abstract

The first lower hybrid current drive experiments in the full tungsten WEST tokamak are reported. Good wave coupling is found at rather low plasma current (q95~4.3) and medium density (ne~3×10¹⁹m^-3). Reflection coefficient is in agreement with the expectation from the linear theory of coupling. With low reflection coefficients, 5MW was coupled for 2 seconds. High central electron temperature, up to 5keV, is achieved at ne=3-4×10¹⁹m^-3. Flat and even hollow profiles of tungsten density are derived from the bolometry diagnostic. The stored thermal energy follows the H96-P scaling law with very slight degradation with density. The current drive efficiency has been assessed in low loop voltage (VL~0.15V) discharges. Low plasma current operation and rather high effective charge (Zeff~3) lead to modest current drive efficiency (η=0.5-0.65×10¹⁹ A.W^-1m^-2). Long pulse operation (~30s) with high LHCD power (PLH=2.7MW) is achieved with stationary parameters, in particular electron and impurity densities, with the upper water-cooled tungsten divertor.

Original language	English
Title of host publication	23rd Topical Conference on Radiofrequency Power in Plasmas
Editors	Paul T. Bonoli, Robert I. Pinsker, Xiaojie Wang
Publisher	American Institute of Physics Inc.
ISBN (Electronic)	9780735420137
DOIs	https://doi.org/10.1063/5.0014034
State	Published - Sep 16 2020
Event	23rd Topical Conference on Radiofrequency Power in Plasmas - Hefei, China Duration: May 14 2019 → May 17 2019

Publication series

Name	AIP Conference Proceedings
Volume	2254
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	23rd Topical Conference on Radiofrequency Power in Plasmas
Country/Territory	China
City	Hefei
Period	05/14/19 → 05/17/19

Access to Document

10.1063/5.0014034

Cite this

@inproceedings{aa2e0d14561a433a91f1e5a6fe4dd7e2,

title = "First lower hybrid current drive experiments on the West Tokamak",

abstract = "The first lower hybrid current drive experiments in the full tungsten WEST tokamak are reported. Good wave coupling is found at rather low plasma current (q95~4.3) and medium density (ne~3×1019m-3). Reflection coefficient is in agreement with the expectation from the linear theory of coupling. With low reflection coefficients, 5MW was coupled for 2 seconds. High central electron temperature, up to 5keV, is achieved at ne=3-4×1019m-3. Flat and even hollow profiles of tungsten density are derived from the bolometry diagnostic. The stored thermal energy follows the H96-P scaling law with very slight degradation with density. The current drive efficiency has been assessed in low loop voltage (VL~0.15V) discharges. Low plasma current operation and rather high effective charge (Zeff~3) lead to modest current drive efficiency (η=0.5-0.65×1019 A.W-1m-2). Long pulse operation (~30s) with high LHCD power (PLH=2.7MW) is achieved with stationary parameters, in particular electron and impurity densities, with the upper water-cooled tungsten divertor.",

author = "{WEST Team} and M. Goniche and Artaud, {J. F.} and C. Bourdelle and J. Bucalossi and C. Desgranges and L. Delpech and P. Devynck and R. Dumont and A. Ekedahl and N. Fedorczak and J. Garcia and C. Gil and J. Gunn and Klepper, {C. C.} and P. Maget and D. Mazon and O. Meyer and J. Morales and Ph Moreau and R. Nouailletas and Y. Peysson and X. Regal-Mezin and C. Reux and F. Saint-Laurent and D. Vezinet",

note = "Publisher Copyright: {\textcopyright} 2020 American Institute of Physics Inc.. All rights reserved.; 23rd Topical Conference on Radiofrequency Power in Plasmas ; Conference date: 14-05-2019 Through 17-05-2019",

year = "2020",

month = sep,

day = "16",

doi = "10.1063/5.0014034",

language = "English",

series = "AIP Conference Proceedings",

publisher = "American Institute of Physics Inc.",

editor = "Bonoli, {Paul T.} and Pinsker, {Robert I.} and Xiaojie Wang",

booktitle = "23rd Topical Conference on Radiofrequency Power in Plasmas",

}

WEST Team 2020, First lower hybrid current drive experiments on the West Tokamak. in PT Bonoli, RI Pinsker & X Wang (eds), 23rd Topical Conference on Radiofrequency Power in Plasmas., 30002, AIP Conference Proceedings, vol. 2254, American Institute of Physics Inc., 23rd Topical Conference on Radiofrequency Power in Plasmas, Hefei, China, 05/14/19. https://doi.org/10.1063/5.0014034

First lower hybrid current drive experiments on the West Tokamak. / WEST Team.
23rd Topical Conference on Radiofrequency Power in Plasmas. ed. / Paul T. Bonoli; Robert I. Pinsker; Xiaojie Wang. American Institute of Physics Inc., 2020. 30002 (AIP Conference Proceedings; Vol. 2254).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - First lower hybrid current drive experiments on the West Tokamak

AU - WEST Team

AU - Goniche, M.

AU - Artaud, J. F.

AU - Bourdelle, C.

AU - Bucalossi, J.

AU - Desgranges, C.

AU - Delpech, L.

AU - Devynck, P.

AU - Dumont, R.

AU - Ekedahl, A.

AU - Fedorczak, N.

AU - Garcia, J.

AU - Gil, C.

AU - Gunn, J.

AU - Klepper, C. C.

AU - Maget, P.

AU - Mazon, D.

AU - Meyer, O.

AU - Morales, J.

AU - Moreau, Ph

AU - Nouailletas, R.

AU - Peysson, Y.

AU - Regal-Mezin, X.

AU - Reux, C.

AU - Saint-Laurent, F.

AU - Vezinet, D.

PY - 2020/9/16

Y1 - 2020/9/16

N2 - The first lower hybrid current drive experiments in the full tungsten WEST tokamak are reported. Good wave coupling is found at rather low plasma current (q95~4.3) and medium density (ne~3×1019m-3). Reflection coefficient is in agreement with the expectation from the linear theory of coupling. With low reflection coefficients, 5MW was coupled for 2 seconds. High central electron temperature, up to 5keV, is achieved at ne=3-4×1019m-3. Flat and even hollow profiles of tungsten density are derived from the bolometry diagnostic. The stored thermal energy follows the H96-P scaling law with very slight degradation with density. The current drive efficiency has been assessed in low loop voltage (VL~0.15V) discharges. Low plasma current operation and rather high effective charge (Zeff~3) lead to modest current drive efficiency (η=0.5-0.65×1019 A.W-1m-2). Long pulse operation (~30s) with high LHCD power (PLH=2.7MW) is achieved with stationary parameters, in particular electron and impurity densities, with the upper water-cooled tungsten divertor.

AB - The first lower hybrid current drive experiments in the full tungsten WEST tokamak are reported. Good wave coupling is found at rather low plasma current (q95~4.3) and medium density (ne~3×1019m-3). Reflection coefficient is in agreement with the expectation from the linear theory of coupling. With low reflection coefficients, 5MW was coupled for 2 seconds. High central electron temperature, up to 5keV, is achieved at ne=3-4×1019m-3. Flat and even hollow profiles of tungsten density are derived from the bolometry diagnostic. The stored thermal energy follows the H96-P scaling law with very slight degradation with density. The current drive efficiency has been assessed in low loop voltage (VL~0.15V) discharges. Low plasma current operation and rather high effective charge (Zeff~3) lead to modest current drive efficiency (η=0.5-0.65×1019 A.W-1m-2). Long pulse operation (~30s) with high LHCD power (PLH=2.7MW) is achieved with stationary parameters, in particular electron and impurity densities, with the upper water-cooled tungsten divertor.

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U2 - 10.1063/5.0014034

DO - 10.1063/5.0014034

M3 - Conference contribution

AN - SCOPUS:85092035629

T3 - AIP Conference Proceedings

BT - 23rd Topical Conference on Radiofrequency Power in Plasmas

A2 - Bonoli, Paul T.

A2 - Pinsker, Robert I.

A2 - Wang, Xiaojie

PB - American Institute of Physics Inc.

T2 - 23rd Topical Conference on Radiofrequency Power in Plasmas

Y2 - 14 May 2019 through 17 May 2019

ER -

First lower hybrid current drive experiments on the West Tokamak

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