Design of a finline antenna for current drive in TST-2

Watanabe, Osamu; Ko, Yongtae; Tsujii, N.; Takase, Y.; Ejiri, A.; Shinohara, K.; Peng, Y. K. M.; Iwasaki, Kotaro; Yamada, Iwao; Yatomi, Go; Moeller, C.P.

doi:10.1016/j.fusengdes.2022.113094

Cited by 1 publication

(8 citation statements)

References 30 publications

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“…The finline antenna manipulated at 2.45 GHz with n ∥ fixed at 2.59 has been tested on TST-2. Previous research pointed out that the expected plasma current using the present finline was less than 1 kA and the antenna parameters may be improved [26]. So, it cannot be considered for EXL-50.…”

Section: Introductionmentioning

confidence: 94%

“…The function of guide wave can be enhanced by grooves and elements. In theory, the corrugation period (a = g + t) should be adequately enough shorter than the wavelength [26,27]:…”

Section: Parallel Refractive Indexmentioning

confidence: 99%

“…Therefore, the propagation constant diverges when d = λ 0 /4. If the groove is deeper than λ 0 /4, it is expected that the higher order mode is formed inside the groove [26][27][28].…”

Section: Parallel Refractive Indexmentioning

confidence: 99%

“…The radiation microwave power (P) is one of the antenna basic characteristics [27] and usually calculated through microwave engineering theory [27,29]. For the surface wave antenna, only part of P can be excited into LHW [26].…”

Section: The S Parametersmentioning

confidence: 99%

“…Antennas used in the LHW frequency for STs comprise finline in Japan [26] and grill in Russia [1]. The finline antenna manipulated at 2.45 GHz with n ∥ fixed at 2.59 has been tested on TST-2.…”

Section: Introductionmentioning

confidence: 99%

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Development of an arch antenna for LHCD in a spherical tokamak

Wang

Zhou²,

Wang³

et al. 2023

Nucl. Fusion

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A lower-hybrid (LH) frequency surface wave antenna called arch is designed and fabricated in this paper for spherical tokamak (ST) named EXL-50. It is used to drive plasma current and heat plasma at 2.45 GHz. The arch antenna consists of twenty-seven antenna elements. The left and right rectangular waveguides integrated with the antenna are used for microwave input and output, respectively. The refraction parallel index of this proposed antenna is 4.3, which is favorable for the lower hybrid current drive (LHCD). The measurement results in absence of plasma show that the reflection and transmission coefficients (S11 and S21) are -12.5dB and -12.6 dB, respectively. The antenna was installed and tested on EXL-50. Up to a 35 kA plasma current was achieved using the arch antenna with a microwave of 70 kW.

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Section: Introductionmentioning

confidence: 94%

“…The function of guide wave can be enhanced by grooves and elements. In theory, the corrugation period (a = g + t) should be adequately enough shorter than the wavelength [26,27]:…”

Section: Parallel Refractive Indexmentioning

confidence: 99%

“…Therefore, the propagation constant diverges when d = λ 0 /4. If the groove is deeper than λ 0 /4, it is expected that the higher order mode is formed inside the groove [26][27][28].…”

Section: Parallel Refractive Indexmentioning

confidence: 99%

Section: The S Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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