The dedicated ICRH system for the stellarator Wendelstein 7-X

J. Ongena; A. Messiaen; P. Dumortier; F. Durodie; Y. O. Kazakov; F. Louche; B. Schweer; M. Vervier; D. Van Eester; R. Koch; A. Krivska; A. Lyssoivan; M. Van Schoor; T. Wauters; V. Borsuk; O. Neubauer; O. Schmitz; G. Offermans; Y. Tenburg; C. Baylard; D. Birus; S. Bozhenkov; D. A. Hartmann; J. Kallmeyer; S. Renard; R. Wolf

doi:10.1063/1.4864508

The dedicated ICRH system for the stellarator Wendelstein 7-X

J. Ongena, A. Messiaen, P. Dumortier, F. Durodie, Y. O. Kazakov, F. Louche, B. Schweer, M. Vervier, D. Van Eester, R. Koch, A. Krivska, A. Lyssoivan, M. Van Schoor, T. Wauters, V. Borsuk, O. Neubauer, O. Schmitz, G. Offermans, Y. Tenburg, C. BaylardD. Birus, S. Bozhenkov, D. A. Hartmann, J. Kallmeyer, S. Renard, R. Wolf

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

Abstract

The current status of the mechanical and electromagnetic design for the ICRF antenna system for W7-X is presented. Two antenna plugins are discussed: one consisting of a pair of straps with pre-matching to cover the first frequency band 25-38 MHz and a second one consisting of two short strap triplets to cover a frequency band around 76 MHz. This paper focusses on the two strap antenna for the lower frequency band. Power coupling of the antenna to a reference plasma profile is studied with the help of the codes TOPICA and Microwave Studio, that deliver the scattering matrix needed for the optimization of the geometric parameters of the straps and antenna box. Radiation power spectra for different phasings of the two straps are obtained using the code ANTITER II and different heating scenarii are discussed. The potential for heating, fast particle generation and current drive is discussed. The problem of RF coupling through the plasma edge and of edge power deposition is summarized. The system contains a prematching capacitor to limit the maximum voltage in the system, and the large mutual coupling between the 2 straps is counterbalanced by the use of a decoupler. The mechanical design highlights the challenges encountered with this antenna: adaptation to a large variety of plasma configurations, the limited space within the port to accommodate the necessary matching components and the watercooling needed for long pulse operation.

Original language	English
Title of host publication	Radiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference
Publisher	American Institute of Physics Inc.
Pages	105-112
Number of pages	8
ISBN (Print)	9780735412101
DOIs	https://doi.org/10.1063/1.4864508
Publication status	Published - 2014
Event	20th Topical Conference on Radiofrequency Power in Plasmas - Sorrento, Italy Duration: 25 Jun 2013 → 28 Jun 2013

Publication series

Name	AIP Conference Proceedings
Volume	1580
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	20th Topical Conference on Radiofrequency Power in Plasmas
Country/Territory	Italy
City	Sorrento
Period	25/06/13 → 28/06/13

Keywords

5-ports junction
ICRH
W7-X. coupling
decoupler
matching

Access to Document

10.1063/1.4864508

Cite this

Ongena, J., Messiaen, A., Dumortier, P., Durodie, F., Kazakov, Y. O., Louche, F., Schweer, B., Vervier, M., Van Eester, D., Koch, R., Krivska, A., Lyssoivan, A., Van Schoor, M., Wauters, T., Borsuk, V., Neubauer, O., Schmitz, O., Offermans, G., Tenburg, Y., ... Wolf, R. (2014). The dedicated ICRH system for the stellarator Wendelstein 7-X. In Radiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference (pp. 105-112). (AIP Conference Proceedings; Vol. 1580). American Institute of Physics Inc.. https://doi.org/10.1063/1.4864508

@inproceedings{5b5863cf4630444b859baf806e8e36fb,

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

abstract = "The current status of the mechanical and electromagnetic design for the ICRF antenna system for W7-X is presented. Two antenna plugins are discussed: one consisting of a pair of straps with pre-matching to cover the first frequency band 25-38 MHz and a second one consisting of two short strap triplets to cover a frequency band around 76 MHz. This paper focusses on the two strap antenna for the lower frequency band. Power coupling of the antenna to a reference plasma profile is studied with the help of the codes TOPICA and Microwave Studio, that deliver the scattering matrix needed for the optimization of the geometric parameters of the straps and antenna box. Radiation power spectra for different phasings of the two straps are obtained using the code ANTITER II and different heating scenarii are discussed. The potential for heating, fast particle generation and current drive is discussed. The problem of RF coupling through the plasma edge and of edge power deposition is summarized. The system contains a prematching capacitor to limit the maximum voltage in the system, and the large mutual coupling between the 2 straps is counterbalanced by the use of a decoupler. The mechanical design highlights the challenges encountered with this antenna: adaptation to a large variety of plasma configurations, the limited space within the port to accommodate the necessary matching components and the watercooling needed for long pulse operation.",

keywords = "5-ports junction, ICRH, W7-X. coupling, decoupler, matching",

author = "J. Ongena and A. Messiaen and P. Dumortier and F. Durodie and Kazakov, {Y. O.} and F. Louche and B. Schweer and M. Vervier and {Van Eester}, D. and R. Koch and A. Krivska and A. Lyssoivan and {Van Schoor}, M. and T. Wauters and V. Borsuk and O. Neubauer and O. Schmitz and G. Offermans and Y. Tenburg and C. Baylard and D. Birus and S. Bozhenkov and Hartmann, {D. A.} and J. Kallmeyer and S. Renard and R. Wolf",

year = "2014",

doi = "10.1063/1.4864508",

language = "English",

isbn = "9780735412101",

series = "AIP Conference Proceedings",

publisher = "American Institute of Physics Inc.",

pages = "105--112",

booktitle = "Radiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference",

note = "20th Topical Conference on Radiofrequency Power in Plasmas ; Conference date: 25-06-2013 Through 28-06-2013",

}

Ongena, J, Messiaen, A, Dumortier, P , Durodie, F , Kazakov, YO , Louche, F, Schweer, B, Vervier, M , Van Eester, D, Koch, R, Krivska, A, Lyssoivan, A, Van Schoor, M, Wauters, T, Borsuk, V, Neubauer, O, Schmitz, O, Offermans, G, Tenburg, Y, Baylard, C, Birus, D, Bozhenkov, S, Hartmann, DA, Kallmeyer, J, Renard, S & Wolf, R 2014, The dedicated ICRH system for the stellarator Wendelstein 7-X. in Radiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference. AIP Conference Proceedings, vol. 1580, American Institute of Physics Inc., pp. 105-112, 20th Topical Conference on Radiofrequency Power in Plasmas, Sorrento, Italy, 25/06/13. https://doi.org/10.1063/1.4864508

The dedicated ICRH system for the stellarator Wendelstein 7-X. / Ongena, J.; Messiaen, A.; Dumortier, P. et al.
Radiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference. American Institute of Physics Inc., 2014. p. 105-112 (AIP Conference Proceedings; Vol. 1580).

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

TY - GEN

T1 - The dedicated ICRH system for the stellarator Wendelstein 7-X

AU - Ongena, J.

AU - Messiaen, A.

AU - Dumortier, P.

AU - Durodie, F.

AU - Kazakov, Y. O.

AU - Louche, F.

AU - Schweer, B.

AU - Vervier, M.

AU - Van Eester, D.

AU - Koch, R.

AU - Krivska, A.

AU - Lyssoivan, A.

AU - Van Schoor, M.

AU - Wauters, T.

AU - Borsuk, V.

AU - Neubauer, O.

AU - Schmitz, O.

AU - Offermans, G.

AU - Tenburg, Y.

AU - Baylard, C.

AU - Birus, D.

AU - Bozhenkov, S.

AU - Hartmann, D. A.

AU - Kallmeyer, J.

AU - Renard, S.

AU - Wolf, R.

PY - 2014

Y1 - 2014

N2 - The current status of the mechanical and electromagnetic design for the ICRF antenna system for W7-X is presented. Two antenna plugins are discussed: one consisting of a pair of straps with pre-matching to cover the first frequency band 25-38 MHz and a second one consisting of two short strap triplets to cover a frequency band around 76 MHz. This paper focusses on the two strap antenna for the lower frequency band. Power coupling of the antenna to a reference plasma profile is studied with the help of the codes TOPICA and Microwave Studio, that deliver the scattering matrix needed for the optimization of the geometric parameters of the straps and antenna box. Radiation power spectra for different phasings of the two straps are obtained using the code ANTITER II and different heating scenarii are discussed. The potential for heating, fast particle generation and current drive is discussed. The problem of RF coupling through the plasma edge and of edge power deposition is summarized. The system contains a prematching capacitor to limit the maximum voltage in the system, and the large mutual coupling between the 2 straps is counterbalanced by the use of a decoupler. The mechanical design highlights the challenges encountered with this antenna: adaptation to a large variety of plasma configurations, the limited space within the port to accommodate the necessary matching components and the watercooling needed for long pulse operation.

AB - The current status of the mechanical and electromagnetic design for the ICRF antenna system for W7-X is presented. Two antenna plugins are discussed: one consisting of a pair of straps with pre-matching to cover the first frequency band 25-38 MHz and a second one consisting of two short strap triplets to cover a frequency band around 76 MHz. This paper focusses on the two strap antenna for the lower frequency band. Power coupling of the antenna to a reference plasma profile is studied with the help of the codes TOPICA and Microwave Studio, that deliver the scattering matrix needed for the optimization of the geometric parameters of the straps and antenna box. Radiation power spectra for different phasings of the two straps are obtained using the code ANTITER II and different heating scenarii are discussed. The potential for heating, fast particle generation and current drive is discussed. The problem of RF coupling through the plasma edge and of edge power deposition is summarized. The system contains a prematching capacitor to limit the maximum voltage in the system, and the large mutual coupling between the 2 straps is counterbalanced by the use of a decoupler. The mechanical design highlights the challenges encountered with this antenna: adaptation to a large variety of plasma configurations, the limited space within the port to accommodate the necessary matching components and the watercooling needed for long pulse operation.

KW - 5-ports junction

KW - ICRH

KW - W7-X. coupling

KW - decoupler

KW - matching

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U2 - 10.1063/1.4864508

DO - 10.1063/1.4864508

M3 - Conference contribution

AN - SCOPUS:84906346574

SN - 9780735412101

T3 - AIP Conference Proceedings

SP - 105

EP - 112

BT - Radiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference

PB - American Institute of Physics Inc.

T2 - 20th Topical Conference on Radiofrequency Power in Plasmas

Y2 - 25 June 2013 through 28 June 2013

ER -

The dedicated ICRH system for the stellarator Wendelstein 7-X

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Keywords

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