The ICRH system for the stellarator wendelstein 7-X

J. Ongena; A. Messiaen; Ye O. Kazakov; B. Schweer; I. Stepanov; M. Vervier; K. Crombé; M. Van Schoor; V. Borsuk; D. Castaño-Bardawil; A. Kraemer-Flecken; K. P. Hollfeld; G. Offermanns; D. A. Hartmann; J. P. Kallmeyer; R. C. Wolf

doi:10.1063/5.0014264

The ICRH system for the stellarator wendelstein 7-X

J. Ongena, A. Messiaen, Ye O. Kazakov, B. Schweer, I. Stepanov, M. Vervier, K. Crombé, M. Van Schoor, V. Borsuk, D. Castaño-Bardawil, A. Kraemer-Flecken, K. P. Hollfeld, G. Offermanns, D. A. Hartmann, J. P. Kallmeyer, R. C. Wolf

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

Abstract

An important test for W7-X is to demonstrate confinement of fast trapped ions at volume averaged beta values up to 5%, corresponding to plasma densities above 10²⁰ m^-3. Energetic ions in W7-X with energies 50 < E < 100 keV mimic alphas in a reactor. To generate such a population is a challenging task in high-density plasmas but this can be efficiently realized with the H-(³He)-D three-ion heating ICRH scenario, foreseen for f ~ 25 MHz in W7-X. An ICRH system is prepared for W7-X, expected to deposit RF powers up to ~1.5 MW (depending on the coupling) at frequencies between 25-38 MHz in pulses up to 10s. A two-strap ICRH antenna for W7-X is under construction. Each strap of the antenna is on one side connected to a tuning capacitor and grounded to the antenna box at the other end. A prematching has been implemented by connecting the RF transmission lines at an intermediate position on each strap. The main dimensions of straps and antenna box have been optimized to maximise the power delivered to the plasma, using the reference plasma density profile in front of the antenna, provided by the W7-X team. A dedicated test stand is under construction to check the main functional tests of the full ICRH antenna system.

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/10.1063/5.0014264
Publication status	Published - 16 Sept 2020
Event	23rd Topical Conference on Radiofrequency Power in Plasmas - Hefei, China Duration: 14 May 2019 → 17 May 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	14/05/19 → 17/05/19

Access to Document

10.1063/5.0014264

Cite this

Ongena, J., Messiaen, A., Kazakov, Y. O., Schweer, B., Stepanov, I., Vervier, M., Crombé, K., Van Schoor, M., Borsuk, V., Castaño-Bardawil, D., Kraemer-Flecken, A., Hollfeld, K. P., Offermanns, G., Hartmann, D. A., Kallmeyer, J. P., & Wolf, R. C. (2020). The ICRH system for the stellarator wendelstein 7-X. In P. T. Bonoli, R. I. Pinsker, & X. Wang (Eds.), 23rd Topical Conference on Radiofrequency Power in Plasmas Article 70003 (AIP Conference Proceedings; Vol. 2254). American Institute of Physics Inc.. https://doi.org/10.1063/5.0014264

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title = "The ICRH system for the stellarator wendelstein 7-X",

abstract = "An important test for W7-X is to demonstrate confinement of fast trapped ions at volume averaged beta values up to 5%, corresponding to plasma densities above 1020 m-3. Energetic ions in W7-X with energies 50 < E < 100 keV mimic alphas in a reactor. To generate such a population is a challenging task in high-density plasmas but this can be efficiently realized with the H-(3He)-D three-ion heating ICRH scenario, foreseen for f ~ 25 MHz in W7-X. An ICRH system is prepared for W7-X, expected to deposit RF powers up to ~1.5 MW (depending on the coupling) at frequencies between 25-38 MHz in pulses up to 10s. A two-strap ICRH antenna for W7-X is under construction. Each strap of the antenna is on one side connected to a tuning capacitor and grounded to the antenna box at the other end. A prematching has been implemented by connecting the RF transmission lines at an intermediate position on each strap. The main dimensions of straps and antenna box have been optimized to maximise the power delivered to the plasma, using the reference plasma density profile in front of the antenna, provided by the W7-X team. A dedicated test stand is under construction to check the main functional tests of the full ICRH antenna system.",

author = "J. Ongena and A. Messiaen and Kazakov, {Ye O.} and B. Schweer and I. Stepanov and M. Vervier and K. Cromb{\'e} and {Van Schoor}, M. and V. Borsuk and D. Casta{\~n}o-Bardawil and A. Kraemer-Flecken and Hollfeld, {K. P.} and G. Offermanns and Hartmann, {D. A.} and Kallmeyer, {J. P.} and Wolf, {R. C.}",

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 = "10.1063/5.0014264",

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",

}

Ongena, J, Messiaen, A, Kazakov, YO, Schweer, B, Stepanov, I , Vervier, M , Crombé, K, Van Schoor, M, Borsuk, V, Castaño-Bardawil, D, Kraemer-Flecken, A, Hollfeld, KP, Offermanns, G, Hartmann, DA, Kallmeyer, JP & Wolf, RC 2020, The ICRH system for the stellarator wendelstein 7-X. in PT Bonoli, RI Pinsker & X Wang (eds), 23rd Topical Conference on Radiofrequency Power in Plasmas., 70003, AIP Conference Proceedings, vol. 2254, American Institute of Physics Inc., 23rd Topical Conference on Radiofrequency Power in Plasmas, Hefei, China, 14/05/19. https://doi.org/10.1063/5.0014264

The ICRH system for the stellarator wendelstein 7-X. / Ongena, J.; Messiaen, A.; Kazakov, Ye O. et al.
23rd Topical Conference on Radiofrequency Power in Plasmas. ed. / Paul T. Bonoli; Robert I. Pinsker; Xiaojie Wang. American Institute of Physics Inc., 2020. 70003 (AIP Conference Proceedings; Vol. 2254).

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

TY - GEN

T1 - The ICRH system for the stellarator wendelstein 7-X

AU - Ongena, J.

AU - Messiaen, A.

AU - Kazakov, Ye O.

AU - Schweer, B.

AU - Stepanov, I.

AU - Vervier, M.

AU - Crombé, K.

AU - Van Schoor, M.

AU - Borsuk, V.

AU - Castaño-Bardawil, D.

AU - Kraemer-Flecken, A.

AU - Hollfeld, K. P.

AU - Offermanns, G.

AU - Hartmann, D. A.

AU - Kallmeyer, J. P.

AU - Wolf, R. C.

PY - 2020/9/16

Y1 - 2020/9/16

N2 - An important test for W7-X is to demonstrate confinement of fast trapped ions at volume averaged beta values up to 5%, corresponding to plasma densities above 1020 m-3. Energetic ions in W7-X with energies 50 < E < 100 keV mimic alphas in a reactor. To generate such a population is a challenging task in high-density plasmas but this can be efficiently realized with the H-(3He)-D three-ion heating ICRH scenario, foreseen for f ~ 25 MHz in W7-X. An ICRH system is prepared for W7-X, expected to deposit RF powers up to ~1.5 MW (depending on the coupling) at frequencies between 25-38 MHz in pulses up to 10s. A two-strap ICRH antenna for W7-X is under construction. Each strap of the antenna is on one side connected to a tuning capacitor and grounded to the antenna box at the other end. A prematching has been implemented by connecting the RF transmission lines at an intermediate position on each strap. The main dimensions of straps and antenna box have been optimized to maximise the power delivered to the plasma, using the reference plasma density profile in front of the antenna, provided by the W7-X team. A dedicated test stand is under construction to check the main functional tests of the full ICRH antenna system.

AB - An important test for W7-X is to demonstrate confinement of fast trapped ions at volume averaged beta values up to 5%, corresponding to plasma densities above 1020 m-3. Energetic ions in W7-X with energies 50 < E < 100 keV mimic alphas in a reactor. To generate such a population is a challenging task in high-density plasmas but this can be efficiently realized with the H-(3He)-D three-ion heating ICRH scenario, foreseen for f ~ 25 MHz in W7-X. An ICRH system is prepared for W7-X, expected to deposit RF powers up to ~1.5 MW (depending on the coupling) at frequencies between 25-38 MHz in pulses up to 10s. A two-strap ICRH antenna for W7-X is under construction. Each strap of the antenna is on one side connected to a tuning capacitor and grounded to the antenna box at the other end. A prematching has been implemented by connecting the RF transmission lines at an intermediate position on each strap. The main dimensions of straps and antenna box have been optimized to maximise the power delivered to the plasma, using the reference plasma density profile in front of the antenna, provided by the W7-X team. A dedicated test stand is under construction to check the main functional tests of the full ICRH antenna system.

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U2 - 10.1063/5.0014264

DO - 10.1063/5.0014264

M3 - Conference contribution

AN - SCOPUS:85092052144

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 -

The ICRH system for the stellarator wendelstein 7-X

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