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The physics of transport barrier formation in the PBX-M H-mode

G R Tynan, L Schmitz, L Blush, J A Boedo, R W Conn, R Doerner, R Lehmer, R Moyer, H Kugel, R Bell1994年Plasma Physics and Controlled FusionIF 2.2出版社

Measurements of edge profiles, turbulence, and turbulent-driven transport were made inside the last-closed flux surface (LCFS) and in the scrape-off layer (SOL) of PBX-M L-mode and H-mode plasmas using a fast reciprocating Langmuir probe diagnostic. Direct measurements of the potential profile confirm the generation of a strong inward radial electric field (Er approximately -100 V/cm) just inside the LCFS in H-mode. Density and potential fluctuation levels are reduced at the L-H transition, resulting in significantly lower turbulent transport. The edge density gradient then steepens in response to the reduced cross-field transport. After a stable H-mode edge equilibrium is formed, the fluctuation amplitudes recover back to nearly L-mode values. The poloidal wavenumber spectrum is narrowed in the transport barrier, and the density and potential fluctuations are decorrelated. The reduction in turbulent transport occurs across the LCFS and SOL regions and is not localized to the region of strong radial electric field.

日本語訳

周辺プラズマの計測、乱流、および乱流駆動輸送は、PBX-MのLモードおよびHモードプラズマにおいて、最後の閉磁気面(LCFS)の内側とスクレイプオフ層(SOL)で、高速往復ラングミュアプローブを用いて行われた。電位分布の直接計測により、HモードにおいてLCFSのすぐ内側に強い内向きの径方向電場(Er ≈ -100 V/cm)の生成が確認された。密度および電位の変動レベルはL-H遷移において低減し、その結果、乱流輸送は有意に減少した。その後、周辺密度勾配は、径方向輸送の低減に応じて急峻化した。安定なHモード周辺平衡が形成された後、変動振幅はほぼLモードの値に回復した。ポロイダル波数スペクトルは輸送障壁内で狭まり、密度と電位の変動は非相関となった。乱流輸送の低減はLCFSおよびSOL領域全体にわたって生じており、強い径方向電場の領域に局在してはいない。

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H-modeTransport barrierPBX-M
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