Advanced electron cyclotron heating and current drive experiments on the stellarator Wendelstein 7-X

Torsten Stange; Heinrich Peter Laqua; Marc Beurskens; Hans Stephan Bosch; Sergey Bozhenkov; Rudolf Brakel; Harald Braune; Kai Jakob Brunner; Alvaro Cappa; Andreas Dinklage; Volker Erckmann; Golo Fuchert; Gerd Gantenbein; Florian Gellert; Olaf Grulke; Dirk Hartmann; Matthias Hirsch; Udo Höfel; Walter Kasparek; Jens Knauer; Andreas Langenberg; Stefan Marsen; Nikolai Marushchenko; Dmitry Moseev; Novomir Pablant; Ekkehard Pasch; Kian Rahbarnia; Humberto Trimino Mora; Toru Tsujimura; Yuriy Turkin; Tom Wauters; Robert Wolf

doi:10.1051/epjconf/201715702008

Advanced electron cyclotron heating and current drive experiments on the stellarator Wendelstein 7-X

Torsten Stange, Heinrich Peter Laqua, Marc Beurskens, Hans Stephan Bosch, Sergey Bozhenkov, Rudolf Brakel, Harald Braune, Kai Jakob Brunner, Alvaro Cappa, Andreas Dinklage, Volker Erckmann, Golo Fuchert, Gerd Gantenbein, Florian Gellert, Olaf Grulke, Dirk Hartmann, Matthias Hirsch, Udo Höfel, Walter Kasparek, Jens KnauerAndreas Langenberg, Stefan Marsen, Nikolai Marushchenko, Dmitry Moseev, Novomir Pablant, Ekkehard Pasch, Kian Rahbarnia, Humberto Trimino Mora, Toru Tsujimura, Yuriy Turkin, Tom Wauters, Robert Wolf

Laboratory for Plasma Physics

Research output: Contribution to journal › Conference article › peer-review

Abstract

During the first operational phase (OP 1.1) of Wendelstein 7-X (W7-X) electron cyclotron resonance heating (ECRH) was the exclusive heating method and provided plasma start-up, wall conditioning, heating and current drive. Six gyrotrons were commissioned for OP1.1 and used in parallel for plasma operation with a power of up to 4.3 MW. During standard X2-heating the spatially localized power deposition with high power density allowed controlling the radial profiles of the electron temperature and the rotational transform. Even though W7-X was not fully equipped with first wall tiles and operated with a graphite limiter instead of a divertor, electron densities of n _e > 3·10¹⁹ m^-3 could be achieved at electron temperatures of several keV and ion temperatures above 2 keV. These plasma parameters allowed the first demonstration of a multipath O2-heating scenario, which is envisaged for safe operation near the X-cutoff-density of 1.2·10²⁰ m^-3 after full commissioning of the ECRH system in the next operation phase OP1.2.

Original language	English
Article number	02008
Journal	EPJ Web of Conferences
Volume	157
DOIs	https://doi.org/10.1051/epjconf/201715702008
Publication status	Published - 23 Oct 2017
Event	22nd Topical Conference on Radio-Frequency Power in Plasmas 2017 - Aix en Provence, France Duration: 30 May 2017 → 2 Jun 2017

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Stange, T., Laqua, H. P., Beurskens, M., Bosch, H. S., Bozhenkov, S., Brakel, R., Braune, H., Brunner, K. J., Cappa, A., Dinklage, A., Erckmann, V., Fuchert, G., Gantenbein, G., Gellert, F., Grulke, O., Hartmann, D., Hirsch, M., Höfel, U., Kasparek, W., ... Wolf, R. (2017). Advanced electron cyclotron heating and current drive experiments on the stellarator Wendelstein 7-X. EPJ Web of Conferences, 157, Article 02008. https://doi.org/10.1051/epjconf/201715702008

@article{95c304f23807430d9ce6ddba935542be,

title = "Advanced electron cyclotron heating and current drive experiments on the stellarator Wendelstein 7-X",

abstract = "During the first operational phase (OP 1.1) of Wendelstein 7-X (W7-X) electron cyclotron resonance heating (ECRH) was the exclusive heating method and provided plasma start-up, wall conditioning, heating and current drive. Six gyrotrons were commissioned for OP1.1 and used in parallel for plasma operation with a power of up to 4.3 MW. During standard X2-heating the spatially localized power deposition with high power density allowed controlling the radial profiles of the electron temperature and the rotational transform. Even though W7-X was not fully equipped with first wall tiles and operated with a graphite limiter instead of a divertor, electron densities of n e > 3·1019 m-3 could be achieved at electron temperatures of several keV and ion temperatures above 2 keV. These plasma parameters allowed the first demonstration of a multipath O2-heating scenario, which is envisaged for safe operation near the X-cutoff-density of 1.2·1020 m-3 after full commissioning of the ECRH system in the next operation phase OP1.2.",

author = "Torsten Stange and Laqua, {Heinrich Peter} and Marc Beurskens and Bosch, {Hans Stephan} and Sergey Bozhenkov and Rudolf Brakel and Harald Braune and Brunner, {Kai Jakob} and Alvaro Cappa and Andreas Dinklage and Volker Erckmann and Golo Fuchert and Gerd Gantenbein and Florian Gellert and Olaf Grulke and Dirk Hartmann and Matthias Hirsch and Udo H{\"o}fel and Walter Kasparek and Jens Knauer and Andreas Langenberg and Stefan Marsen and Nikolai Marushchenko and Dmitry Moseev and Novomir Pablant and Ekkehard Pasch and Kian Rahbarnia and Mora, {Humberto Trimino} and Toru Tsujimura and Yuriy Turkin and Tom Wauters and Robert Wolf",

note = "Publisher Copyright: {\textcopyright} 2017 The authors, published by EDP Sciences.; 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017 ; Conference date: 30-05-2017 Through 02-06-2017",

year = "2017",

month = oct,

day = "23",

doi = "10.1051/epjconf/201715702008",

language = "English",

volume = "157",

journal = "EPJ Web of Conferences",

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Stange, T, Laqua, HP, Beurskens, M, Bosch, HS, Bozhenkov, S, Brakel, R, Braune, H, Brunner, KJ, Cappa, A, Dinklage, A, Erckmann, V, Fuchert, G, Gantenbein, G, Gellert, F, Grulke, O, Hartmann, D, Hirsch, M, Höfel, U, Kasparek, W, Knauer, J, Langenberg, A, Marsen, S, Marushchenko, N, Moseev, D, Pablant, N, Pasch, E, Rahbarnia, K, Mora, HT, Tsujimura, T, Turkin, Y, Wauters, T & Wolf, R 2017, 'Advanced electron cyclotron heating and current drive experiments on the stellarator Wendelstein 7-X', EPJ Web of Conferences, vol. 157, 02008. https://doi.org/10.1051/epjconf/201715702008

TY - JOUR

T1 - Advanced electron cyclotron heating and current drive experiments on the stellarator Wendelstein 7-X

AU - Stange, Torsten

AU - Laqua, Heinrich Peter

AU - Beurskens, Marc

AU - Bosch, Hans Stephan

AU - Bozhenkov, Sergey

AU - Brakel, Rudolf

AU - Braune, Harald

AU - Brunner, Kai Jakob

AU - Cappa, Alvaro

AU - Dinklage, Andreas

AU - Erckmann, Volker

AU - Fuchert, Golo

AU - Gantenbein, Gerd

AU - Gellert, Florian

AU - Grulke, Olaf

AU - Hartmann, Dirk

AU - Hirsch, Matthias

AU - Höfel, Udo

AU - Kasparek, Walter

AU - Knauer, Jens

AU - Langenberg, Andreas

AU - Marsen, Stefan

AU - Marushchenko, Nikolai

AU - Moseev, Dmitry

AU - Pablant, Novomir

AU - Pasch, Ekkehard

AU - Rahbarnia, Kian

AU - Mora, Humberto Trimino

AU - Tsujimura, Toru

AU - Turkin, Yuriy

AU - Wauters, Tom

AU - Wolf, Robert

PY - 2017/10/23

Y1 - 2017/10/23

N2 - During the first operational phase (OP 1.1) of Wendelstein 7-X (W7-X) electron cyclotron resonance heating (ECRH) was the exclusive heating method and provided plasma start-up, wall conditioning, heating and current drive. Six gyrotrons were commissioned for OP1.1 and used in parallel for plasma operation with a power of up to 4.3 MW. During standard X2-heating the spatially localized power deposition with high power density allowed controlling the radial profiles of the electron temperature and the rotational transform. Even though W7-X was not fully equipped with first wall tiles and operated with a graphite limiter instead of a divertor, electron densities of n e > 3·1019 m-3 could be achieved at electron temperatures of several keV and ion temperatures above 2 keV. These plasma parameters allowed the first demonstration of a multipath O2-heating scenario, which is envisaged for safe operation near the X-cutoff-density of 1.2·1020 m-3 after full commissioning of the ECRH system in the next operation phase OP1.2.

AB - During the first operational phase (OP 1.1) of Wendelstein 7-X (W7-X) electron cyclotron resonance heating (ECRH) was the exclusive heating method and provided plasma start-up, wall conditioning, heating and current drive. Six gyrotrons were commissioned for OP1.1 and used in parallel for plasma operation with a power of up to 4.3 MW. During standard X2-heating the spatially localized power deposition with high power density allowed controlling the radial profiles of the electron temperature and the rotational transform. Even though W7-X was not fully equipped with first wall tiles and operated with a graphite limiter instead of a divertor, electron densities of n e > 3·1019 m-3 could be achieved at electron temperatures of several keV and ion temperatures above 2 keV. These plasma parameters allowed the first demonstration of a multipath O2-heating scenario, which is envisaged for safe operation near the X-cutoff-density of 1.2·1020 m-3 after full commissioning of the ECRH system in the next operation phase OP1.2.

UR - http://www.scopus.com/inward/record.url?scp=85032639434&partnerID=8YFLogxK

U2 - 10.1051/epjconf/201715702008

DO - 10.1051/epjconf/201715702008

M3 - Conference article

AN - SCOPUS:85032639434

SN - 2101-6275

VL - 157

JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

M1 - 02008

T2 - 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017

Y2 - 30 May 2017 through 2 June 2017

ER -

Advanced electron cyclotron heating and current drive experiments on the stellarator Wendelstein 7-X

Abstract

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