Validation of Neutral Point on JT-60U, Alcator C-Mod and ASDEX-Upgrade Tokamaks.

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  • ＪＴ‐６０Ｕ，Ａｌｃａｔｏｒ　Ｃ‐ＭｏｄおよびＡＳＤＥＸ‐Ｕｐｇｒａｄｅトカマクにおける中立平衡点の評価
  • JT-60U,Alcator C-ModおよびASDEX-Upgradeトカマクにおける中立平衡点の評価
  • JT 60U Alcator C Mod オヨビ ASDEX Upgrade トカマク ニ オケル チュウリツ ヘイコウテン ノ ヒョウカ

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Validation studies of a neutrally balanced vertical plasma position, so-called ”neutral point”, have been carried out by computational simulations and experiments under trilateral Japan-US-EU collaborations. It was clarified that the neutral point, where VDEs (Vertical Displacement Events) are hardly occurred, does exit in the Alcator C-Mod and ASDEX-Upgrade tokamaks as well as the JT-60U, consistent with the simulations. Meanwhile, precise details of the VDE behavior exhibit their own characters according to the individual ofthe tokamaks such as an up-down asymmetry of plasma shape. Sensitivity of the neutral point to the plasma shape and current profile was also addressed in detail.

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