Study and design of the ion cyclotron resonance heating system for the stellarator Wendelstein 7-X

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

doi:10.1063/1.4884377

Study and design of the ion cyclotron resonance heating system for the stellarator Wendelstein 7-X

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

Research output: Contribution to journal › Article › 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 scenario 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. Important elements of the complete ion cyclotron resonance heating system are discussed: a resonator circuit with tap feed to limit the maximum voltage in the system, and a decoupler to counterbalance the large mutual coupling between the 2 straps. 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
Article number	061514
Journal	Physics of Plasmas
Volume	21
Issue number	6
DOIs	https://doi.org/10.1063/1.4884377
Publication status	Published - Jun 2014

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Ongena, J., Messiaen, A., Van Eester, D., Schweer, B., Dumortier, P., Durodie, F., Kazakov, Y. O., Louche, F., Vervier, M., Koch, R., Krivska, A., Lyssoivan, A., Van Schoor, M., Wauters, T., Borsuk, V., Neubauer, O., Schmitz, O., Offermans, G., Altenburg, Y., ... Fülöp, T. (2014). Study and design of the ion cyclotron resonance heating system for the stellarator Wendelstein 7-X. Physics of Plasmas, 21(6), Article 061514. https://doi.org/10.1063/1.4884377

@article{56d8ebc60f824a2d9c96d367568dbfc9,

title = "Study and design of the ion cyclotron resonance heating 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 scenario 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. Important elements of the complete ion cyclotron resonance heating system are discussed: a resonator circuit with tap feed to limit the maximum voltage in the system, and a decoupler to counterbalance the large mutual coupling between the 2 straps. 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.",

author = "J. Ongena and A. Messiaen and {Van Eester}, D. and B. Schweer and P. Dumortier and F. Durodie and Kazakov, {Ye O.} and F. Louche and M. Vervier 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. Altenburg and C. Baylard and D. Birus and S. Bozhenkov and Hartmann, {D. A.} and Kallmeyer, {J. P.} and S. Renard and Wolf, {R. C.} and T. F{\"u}l{\"o}p",

year = "2014",

month = jun,

doi = "10.1063/1.4884377",

language = "English",

volume = "21",

journal = "Physics of Plasmas",

issn = "1070-664X",

number = "6",

}

Ongena, J, Messiaen, A, Van Eester, D, Schweer, B, Dumortier, P , Durodie, F , Kazakov, YO , Louche, F , Vervier, M, Koch, R, Krivska, A, Lyssoivan, A, Van Schoor, M, Wauters, T, Borsuk, V, Neubauer, O, Schmitz, O, Offermans, G, Altenburg, Y, Baylard, C, Birus, D, Bozhenkov, S, Hartmann, DA, Kallmeyer, JP, Renard, S, Wolf, RC & Fülöp, T 2014, 'Study and design of the ion cyclotron resonance heating system for the stellarator Wendelstein 7-X', Physics of Plasmas, vol. 21, no. 6, 061514. https://doi.org/10.1063/1.4884377

TY - JOUR

T1 - Study and design of the ion cyclotron resonance heating system for the stellarator Wendelstein 7-X

AU - Ongena, J.

AU - Messiaen, A.

AU - Van Eester, D.

AU - Schweer, B.

AU - Dumortier, P.

AU - Durodie, F.

AU - Kazakov, Ye O.

AU - Louche, F.

AU - Vervier, M.

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 - Altenburg, Y.

AU - Baylard, C.

AU - Birus, D.

AU - Bozhenkov, S.

AU - Hartmann, D. A.

AU - Kallmeyer, J. P.

AU - Renard, S.

AU - Wolf, R. C.

AU - Fülöp, T.

PY - 2014/6

Y1 - 2014/6

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 scenario 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. Important elements of the complete ion cyclotron resonance heating system are discussed: a resonator circuit with tap feed to limit the maximum voltage in the system, and a decoupler to counterbalance the large mutual coupling between the 2 straps. 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 scenario 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. Important elements of the complete ion cyclotron resonance heating system are discussed: a resonator circuit with tap feed to limit the maximum voltage in the system, and a decoupler to counterbalance the large mutual coupling between the 2 straps. 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.

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U2 - 10.1063/1.4884377

DO - 10.1063/1.4884377

M3 - Article

AN - SCOPUS:84903649937

SN - 1070-664X

VL - 21

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 6

M1 - 061514

ER -

Study and design of the ion cyclotron resonance heating system for the stellarator Wendelstein 7-X

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