[논문]Design of multipactor-suppressed high-power VFT for helicon current drive in KSTAR

Jang, K.H.; Wang, S.J.; Wi, H.H.; Saito, K.; Kim, J.H.; Lee, H.Y.; Kwak, J.G.

doi:10.1016/j.fusengdes.2020.111960

[해외논문] Design of multipactor-suppressed high-power VFT for helicon current drive in KSTAR

Fusion engineering and design, v.161, 2020년, pp.111960 -

Jang, K.H. (National Fusion Research Institute) , Wang, S.J. (National Fusion Research Institute) , Wi, H.H. (National Fusion Research Institute) , Saito, K. (National Institute for Fusion Science, National Institutes of Natural Sciences) , Kim, J.H. (National Fusion Research Institute) , Lee, H.Y. (National Fusion Research Institute) , Kwak, J.G. (National Fusion Research Institute)

Abstract ▼ AI-Helper

Abstract A helicon wave was tested for coupling at low power in the KSTAR, and high-power coupling has also been tried. When RF is applied to the antenna system, the reflected power gradually increases on a sub-millisecond timescale. A slower process than usual arcing suggests that a multipactor discharge causes the reflection. It is essential to mitigate or eliminate the multipactor discharge to apply a high-power helicon wave to the tokamak plasmas. A new VFT is fabricated following a design that focuses on the reduced total RF electric field and zero axial electric field on TiN-coated alumina and conductor surfaces. The unmatched impedance caused by the 1-cm-thick alumina is compensated by the series matching element positioned in the pressurized section. Particle in cell codes are used to predict the effects of secondary electrons caused by electrons emitted in the high-power RF transmissions. Different coating conditions are compared, and it is calculated that the designed VFT is free from multipacting. Thermomechanical stress and deformation due to the RF loss is also analyzed. The RF characteristics of the fabricated VFT agrees well with the design. Currently, a megawatt-level high-power test with the KSTAR helicon antenna in a vacuum is being prepared. Highlights A high power VFT for Helicon wave transmission to KSTAR has been developed. An electrical design that reduces the axial electric field partially suppressed the multipactor. TiN coating is an important design method to suppress multipactor discharge. A structural analysis was performed in consideration of the heat deformation caused by RF loss.

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DOI : 10.1016/j.fusengdes.2020.111960
Elsevier : 저널 > 논문

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