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Density profile peaking in the presence of ECRH heating in TCV

A Zabolotsky, H Weisen, TCV Team2006年Plasma Physics and Controlled FusionIF 2.2出版社

Experimental observations in stationary ECRH discharges in TCV show that additional heating has a strong effect on the electron density profile. In the absence of MHD activity or strong internal transport barriers, additional electron heating generally leads to a broadening of the density profiles with respect to the Ohmic target plasma profiles. In the ECRH L-mode and in the presence of weak electron internal transport barriers, the density peaking factor depends on the edge safety factor, the power deposition profile and ECRH power. Beyond a critical power of some 0.5 MW, the power dependence saturates. The edge safety factor dependence is supportive of turbulent equipartition (TEP) theory, which predicts inward convection in the presence of turbulence. The observation of a reduction in the peaking with central electron heating supports drift wave turbulence theory, which predicts the decrease of inward particle convection in addition to the inward convection by TEP, when trapped electron modes are destabilized, thereby reducing the net inward convection.

日本語訳

TCVにおける定常ECRH放電の実験的観測により、追加加熱が電子密度分布に強い影響を与えることが示された。MHD活動や強い内部輸送障壁が存在しない場合、追加の電子加熱は一般に、オーミック目標プラズマの密度分布と比較して密度分布の平坦化をもたらす。ECRH Lモードおよび弱い電子内部輸送障壁の存在下では、密度ピーキング係数は、エッジ安全係数、パワー堆積分布、およびECRHパワーに依存する。約0.5 MWの臨界パワーを超えると、パワー依存性は飽和する。エッジ安全係数への依存性は、乱流の存在下での内向き対流を予測する乱流等分配(TEP)理論を支持するものである。中央電子加熱によるピーキングの減少の観測は、捕捉電子モードが不安定化された際に、TEPによる内向き対流に加えて内向き粒子対流の減少を予測するドリフト波乱流理論を支持するものであり、これにより正味の内向き対流が減少する。

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Electron cyclotron heatingTCVDensity profiles
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