Development of a fishbone travelling wave antenna for LHD

Y. Takase; C. P. Moeller; T. Seki; N. Takeuchi; T. Watari; R. Callis; A. Ejiri; H. Ikezi; H. Kasahara; N. Kasuya; R. Kumazawa; T. Mutoh; K. Ohkubo; R. A. Olstad; M. Saigusa; K. Saito; S. Shiraiwa; T. Taniguchi; H. Torii; H. Wada; K. Yamagishi; T. Yamamoto

doi:10.1088/0029-5515/44/2/011

Development of a fishbone travelling wave antenna for LHD

Y. Takase, C. P. Moeller, T. Seki, N. Takeuchi, T. Watari, R. Callis, A. Ejiri, H. Ikezi, H. Kasahara, N. Kasuya, R. Kumazawa, T. Mutoh, K. Ohkubo, R. A. Olstad, M. Saigusa, K. Saito, S. Shiraiwa, T. Taniguchi, H. Torii, H. WadaK. Yamagishi, T. Yamamoto

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The 'fishbone' fast wave travelling wave antenna was developed for LHD to provide a capability for rotational transform profile control by current drive. The fishbone antenna is equivalent to two combline antennae stacked vertically. The antenna operates around 75 MHz and excites a wavenumber of 14m^-1 when the phase difference between adjacent current straps is 90°. A test of a combline antenna with plasma load on the TST-2 spherical tokamak suggested the possibility that this type of antenna does not need to be installed in the immediate vicinity of the last closed flux surface. Optimization of the design was performed based on measurements on mock-up antennas and model calculations. In the fishbone antenna, controlled excitation of the even mode (with currents in the top and bottom halves of a current strap in the same direction) is necessary. A predominant excitation of the even mode was realized in the LHD fishbone antenna with simulated loading by selecting an appropriate operating frequency.

Original language	English
Pages (from-to)	296-302
Number of pages	7
Journal	Nuclear Fusion
Volume	44
Issue number	2
DOIs	https://doi.org/10.1088/0029-5515/44/2/011
Publication status	Published - Feb 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/44/2/011

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Takase, Y., Moeller, C. P., Seki, T., Takeuchi, N., Watari, T., Callis, R., Ejiri, A., Ikezi, H., Kasahara, H., Kasuya, N., Kumazawa, R., Mutoh, T., Ohkubo, K., Olstad, R. A., Saigusa, M., Saito, K., Shiraiwa, S., Taniguchi, T., Torii, H., ... Yamamoto, T. (2004). Development of a fishbone travelling wave antenna for LHD. Nuclear Fusion, 44(2), 296-302. https://doi.org/10.1088/0029-5515/44/2/011

Takase, Y, Moeller, CP, Seki, T, Takeuchi, N, Watari, T, Callis, R, Ejiri, A, Ikezi, H, Kasahara, H, Kasuya, N, Kumazawa, R, Mutoh, T, Ohkubo, K, Olstad, RA, Saigusa, M, Saito, K, Shiraiwa, S, Taniguchi, T, Torii, H, Wada, H, Yamagishi, K & Yamamoto, T 2004, 'Development of a fishbone travelling wave antenna for LHD', Nuclear Fusion, vol. 44, no. 2, pp. 296-302. https://doi.org/10.1088/0029-5515/44/2/011

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abstract = "The 'fishbone' fast wave travelling wave antenna was developed for LHD to provide a capability for rotational transform profile control by current drive. The fishbone antenna is equivalent to two combline antennae stacked vertically. The antenna operates around 75 MHz and excites a wavenumber of 14m-1 when the phase difference between adjacent current straps is 90°. A test of a combline antenna with plasma load on the TST-2 spherical tokamak suggested the possibility that this type of antenna does not need to be installed in the immediate vicinity of the last closed flux surface. Optimization of the design was performed based on measurements on mock-up antennas and model calculations. In the fishbone antenna, controlled excitation of the even mode (with currents in the top and bottom halves of a current strap in the same direction) is necessary. A predominant excitation of the even mode was realized in the LHD fishbone antenna with simulated loading by selecting an appropriate operating frequency.",

author = "Y. Takase and Moeller, {C. P.} and T. Seki and N. Takeuchi and T. Watari and R. Callis and A. Ejiri and H. Ikezi and H. Kasahara and N. Kasuya and R. Kumazawa and T. Mutoh and K. Ohkubo and Olstad, {R. A.} and M. Saigusa and K. Saito and S. Shiraiwa and T. Taniguchi and H. Torii and H. Wada and K. Yamagishi and T. Yamamoto",

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AU - Takase, Y.

AU - Moeller, C. P.

AU - Seki, T.

AU - Takeuchi, N.

AU - Watari, T.

AU - Callis, R.

AU - Ejiri, A.

AU - Ikezi, H.

AU - Kasahara, H.

AU - Kasuya, N.

AU - Kumazawa, R.

AU - Mutoh, T.

AU - Ohkubo, K.

AU - Olstad, R. A.

AU - Saigusa, M.

AU - Saito, K.

AU - Shiraiwa, S.

AU - Taniguchi, T.

AU - Torii, H.

AU - Wada, H.

AU - Yamagishi, K.

AU - Yamamoto, T.

PY - 2004/2

Y1 - 2004/2

N2 - The 'fishbone' fast wave travelling wave antenna was developed for LHD to provide a capability for rotational transform profile control by current drive. The fishbone antenna is equivalent to two combline antennae stacked vertically. The antenna operates around 75 MHz and excites a wavenumber of 14m-1 when the phase difference between adjacent current straps is 90°. A test of a combline antenna with plasma load on the TST-2 spherical tokamak suggested the possibility that this type of antenna does not need to be installed in the immediate vicinity of the last closed flux surface. Optimization of the design was performed based on measurements on mock-up antennas and model calculations. In the fishbone antenna, controlled excitation of the even mode (with currents in the top and bottom halves of a current strap in the same direction) is necessary. A predominant excitation of the even mode was realized in the LHD fishbone antenna with simulated loading by selecting an appropriate operating frequency.

AB - The 'fishbone' fast wave travelling wave antenna was developed for LHD to provide a capability for rotational transform profile control by current drive. The fishbone antenna is equivalent to two combline antennae stacked vertically. The antenna operates around 75 MHz and excites a wavenumber of 14m-1 when the phase difference between adjacent current straps is 90°. A test of a combline antenna with plasma load on the TST-2 spherical tokamak suggested the possibility that this type of antenna does not need to be installed in the immediate vicinity of the last closed flux surface. Optimization of the design was performed based on measurements on mock-up antennas and model calculations. In the fishbone antenna, controlled excitation of the even mode (with currents in the top and bottom halves of a current strap in the same direction) is necessary. A predominant excitation of the even mode was realized in the LHD fishbone antenna with simulated loading by selecting an appropriate operating frequency.

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Development of a fishbone travelling wave antenna for LHD

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