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Experimental investigation of the potentials modified by radio frequency sheaths during ion cyclotron range of frequency on EAST

C M Qin, Y P Zhao, H QWang, X J Zhang, B N Wan, J-M Noterdaeme, F Braun, V Bobkov, Hiroshi Kasahara, E H Kong2013年Plasma Physics and Controlled FusionIF 2.2出版社

Recent ion cyclotron range of frequency (ICRF) experiments combined with lower hybrid wave (LHW) on EAST show that LHW coupling can be strongly modified when the LHW launcher is connected magnetically to a powered ICRF antenna. Using Langmuir probes, investigation of radio frequency (RF)-enhanced potential and local plasma parameters under an applied ICRF pulse is carried out on EAST. When the ICRF antenna connected to the probe is powered, localized high positive peaks appear on the floating potential. The dependence of floating potential modifications on various parameters is investigated. These initial results are shown to be consistent with RF sheath physics. A new four-strap antenna is modelled with the high frequency structural simulator (HFSS) code for evaluation of the parallel electrical fields (E∥) and sheath potentials. It is found that the E∥ fields with the (0, 0, π, π) phase are much higher than those with other phases. Only the (0, π, π, 0) phasing has a significant reduction potential compared with the original two-strap antenna at the dipole phase.

日本語訳

最近のEASTにおけるイオンサイクロトロン周波数帯(ICRF)実験と低域混成波(LHW)を組み合わせた実験により、LHWランチャーが励起中のICRFアンテナと磁気的に結合すると、LHW結合が強く変化し得ることが示された。ラングミュアプローブを用いて、ICRFパルス印加下での高周波(RF)増強電位と局所プラズマパラメータの調査をEASTで実施した。プローブに接続されたICRFアンテナが励起されると、浮遊電位に局所的な高い正のピークが現れる。浮遊電位の変化の各種パラメータへの依存性を調査した。これらの初期結果は、RFシース物理と整合することが示された。新しい4ストラップアンテナを高周波構造シミュレータ(HFSS)コードを用いてモデル化し、平行電場(E∥)とシース電位を評価した。(0, 0, π, π)位相におけるE∥は、他の位相の場合よりもはるかに高いことが見出された。ダイポール位相における元の2ストラップアンテナと比較して、(0, π, π, 0)位相のみが有意な低減ポテンシャルを有することが示された。

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east高精度(タイトル一致)

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EASTIon cyclotron heating
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