Influence of gas puff location on the coupling of lower hybrid waves in JET ELMy H-mode plasmas

A. Ekedahl; V. Petrzilka; Y. Baranov; T. M. Biewer; M. Brix; M. Goniche; P. Jacquet; K. K. Kirov; C. C. Klepper; J. Mailloux; M. L. Mayoral; M. F.F. Nave; J. Ongena; E. Rachlew

doi:10.1088/0741-3335/54/7/074004

Influence of gas puff location on the coupling of lower hybrid waves in JET ELMy H-mode plasmas

A. Ekedahl, V. Petrzilka, Y. Baranov, T. M. Biewer, M. Brix, M. Goniche, P. Jacquet, K. K. Kirov, C. C. Klepper, J. Mailloux, M. L. Mayoral, M. F.F. Nave, J. Ongena, E. Rachlew

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Abstract

Reliable coupling of the lower hybrid current drive (LHCD) to H-mode plasmas in JET is made feasible through a dedicated gas injection system, located at the outer wall and magnetically connected to the antenna (Pericoli Ridolfini et al 2004 Plasma Phys. Control. Fusion 46 349, Ekedahl et al 2005 Nucl. Fusion 45 351, Ekedahl et al 2009 Plasma Phys. Control. Fusion 51 044001). An experiment was carried out in JET in order to investigate whether a gas injection from the top of the torus, as is foreseen for the main gas injection in ITER, could also provide good coupling of the LH waves if magnetically connected to the antenna. The results show that a top gas injection was not efficient for providing a reliable LHCD power injection, in spite of being magnetically connected and in spite of using almost twice the amount of gas flow compared with the dedicated outer mid-plane gas puffing system. A dedicated gas injection system, set in the outer wall and magnetically connected to the LHCD antenna, is therefore recommended in order to provide the reliable coupling conditions for an LHCD antenna in ITER.

Original language	English
Article number	074004
Journal	Plasma Physics and Controlled Fusion
Volume	54
Issue number	7
DOIs	https://doi.org/10.1088/0741-3335/54/7/074004
State	Published - Jul 2012

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Ekedahl, A., Petrzilka, V., Baranov, Y., Biewer, T. M., Brix, M., Goniche, M., Jacquet, P., Kirov, K. K., Klepper, C. C., Mailloux, J., Mayoral, M. L., Nave, M. F. F., Ongena, J., & Rachlew, E. (2012). Influence of gas puff location on the coupling of lower hybrid waves in JET ELMy H-mode plasmas. Plasma Physics and Controlled Fusion, 54(7), Article 074004. https://doi.org/10.1088/0741-3335/54/7/074004

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title = "Influence of gas puff location on the coupling of lower hybrid waves in JET ELMy H-mode plasmas",

abstract = "Reliable coupling of the lower hybrid current drive (LHCD) to H-mode plasmas in JET is made feasible through a dedicated gas injection system, located at the outer wall and magnetically connected to the antenna (Pericoli Ridolfini et al 2004 Plasma Phys. Control. Fusion 46 349, Ekedahl et al 2005 Nucl. Fusion 45 351, Ekedahl et al 2009 Plasma Phys. Control. Fusion 51 044001). An experiment was carried out in JET in order to investigate whether a gas injection from the top of the torus, as is foreseen for the main gas injection in ITER, could also provide good coupling of the LH waves if magnetically connected to the antenna. The results show that a top gas injection was not efficient for providing a reliable LHCD power injection, in spite of being magnetically connected and in spite of using almost twice the amount of gas flow compared with the dedicated outer mid-plane gas puffing system. A dedicated gas injection system, set in the outer wall and magnetically connected to the LHCD antenna, is therefore recommended in order to provide the reliable coupling conditions for an LHCD antenna in ITER.",

author = "A. Ekedahl and V. Petrzilka and Y. Baranov and Biewer, {T. M.} and M. Brix and M. Goniche and P. Jacquet and Kirov, {K. K.} and Klepper, {C. C.} and J. Mailloux and Mayoral, {M. L.} and Nave, {M. F.F.} and J. Ongena and E. Rachlew",

year = "2012",

month = jul,

doi = "10.1088/0741-3335/54/7/074004",

language = "English",

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journal = "Plasma Physics and Controlled Fusion",

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Ekedahl, A, Petrzilka, V, Baranov, Y, Biewer, TM, Brix, M, Goniche, M, Jacquet, P, Kirov, KK, Klepper, CC, Mailloux, J, Mayoral, ML, Nave, MFF, Ongena, J & Rachlew, E 2012, 'Influence of gas puff location on the coupling of lower hybrid waves in JET ELMy H-mode plasmas', Plasma Physics and Controlled Fusion, vol. 54, no. 7, 074004. https://doi.org/10.1088/0741-3335/54/7/074004

TY - JOUR

T1 - Influence of gas puff location on the coupling of lower hybrid waves in JET ELMy H-mode plasmas

AU - Ekedahl, A.

AU - Petrzilka, V.

AU - Baranov, Y.

AU - Biewer, T. M.

AU - Brix, M.

AU - Goniche, M.

AU - Jacquet, P.

AU - Kirov, K. K.

AU - Klepper, C. C.

AU - Mailloux, J.

AU - Mayoral, M. L.

AU - Nave, M. F.F.

AU - Ongena, J.

AU - Rachlew, E.

PY - 2012/7

Y1 - 2012/7

N2 - Reliable coupling of the lower hybrid current drive (LHCD) to H-mode plasmas in JET is made feasible through a dedicated gas injection system, located at the outer wall and magnetically connected to the antenna (Pericoli Ridolfini et al 2004 Plasma Phys. Control. Fusion 46 349, Ekedahl et al 2005 Nucl. Fusion 45 351, Ekedahl et al 2009 Plasma Phys. Control. Fusion 51 044001). An experiment was carried out in JET in order to investigate whether a gas injection from the top of the torus, as is foreseen for the main gas injection in ITER, could also provide good coupling of the LH waves if magnetically connected to the antenna. The results show that a top gas injection was not efficient for providing a reliable LHCD power injection, in spite of being magnetically connected and in spite of using almost twice the amount of gas flow compared with the dedicated outer mid-plane gas puffing system. A dedicated gas injection system, set in the outer wall and magnetically connected to the LHCD antenna, is therefore recommended in order to provide the reliable coupling conditions for an LHCD antenna in ITER.

AB - Reliable coupling of the lower hybrid current drive (LHCD) to H-mode plasmas in JET is made feasible through a dedicated gas injection system, located at the outer wall and magnetically connected to the antenna (Pericoli Ridolfini et al 2004 Plasma Phys. Control. Fusion 46 349, Ekedahl et al 2005 Nucl. Fusion 45 351, Ekedahl et al 2009 Plasma Phys. Control. Fusion 51 044001). An experiment was carried out in JET in order to investigate whether a gas injection from the top of the torus, as is foreseen for the main gas injection in ITER, could also provide good coupling of the LH waves if magnetically connected to the antenna. The results show that a top gas injection was not efficient for providing a reliable LHCD power injection, in spite of being magnetically connected and in spite of using almost twice the amount of gas flow compared with the dedicated outer mid-plane gas puffing system. A dedicated gas injection system, set in the outer wall and magnetically connected to the LHCD antenna, is therefore recommended in order to provide the reliable coupling conditions for an LHCD antenna in ITER.

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JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

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ER -

Influence of gas puff location on the coupling of lower hybrid waves in JET ELMy H-mode plasmas

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