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Improved confinement with edge radiative cooling at high densities and high heating power in TEXTOR

A.M. Messiaen, J. Ongena, U. Samm, B. Unterberg, P.E. Vandenplas, G. Van Oost, G. Van Wassenhove, J. Winter, D. Boucher, P. Dumortier1994年被引用 66Nuclear FusionIF 3出版社

Improved confinement is achieved on TEXTOR under high power conditions (up to 4 MW of additional heating with NBI-co+ICRH, NBI-co+counter or NBI-co+counter+ICRH) with edge radiative cooling employing silicon or neon as the radiating impurities. It is shown that in quasi-stationary conditions up to 85% of the input power can be radiated. Such high power fractions offer the possibility of utilizing these techniques to facilitate the power exhaust problem for a Tokamak reactor. Discharges with edge radiative cooling exhibit enhanced confinement properties at high densities, e.g. at a central line averaged electron density of 7.5*1013 cm-3, an enhancement factor of 1.7 over ITER L89-P confinement scaling is obtained with an edge q value as low as 2.7. Stable discharges have been obtained even with the q=2 surface located inside the radiating zone. Furthermore, for radiatively cooled discharges heated with balanced NBI-co+counter with or without ICRH, supershot-like peaked electron density profiles, with central density values above 1.0*1014 cm-3 are observed. The present results show that there is no impurity accumulation in the centre and the Ne and/or Si concentration is so low that the reactivity of the plasma remains unaffected

日本語訳

TEXTORにおいて、高パワー条件下(NBI-co+ICRH、NBI-co+counter、またはNBI-co+counter+ICRHによる最大4 MWの追加加熱)で、シリコンまたはネオンを放射不純物として用いた端部放射冷却により、改善された閉じ込めが達成された。準定常状態において、入力パワーの最大85%を放射できることが示された。このような高い放射パワー割合は、トカマク炉における排熱問題を緩和するためのこれらの手法の利用可能性を示している。端部放射冷却を伴う放電は、高密度条件下で向上した閉じ込め特性を示す。例えば、中心線平均電子密度7.5×10¹³ cm⁻³において、ITER L89-P閉じ込めスケーリングに対して1.7倍の向上係数が、端部q値が2.7という低い値で得られた。q=2の面が放射領域内に位置する場合でも、安定した放電が達成された。さらに、NBI-co+counterのバランス加熱をICRHの有無にかかわらず用いた放射冷却放電では、中心密度が1.0×10¹⁴ cm⁻³を超える超新古典(supershot様)の尖塔状電子密度分布が観測された。これらの結果は、中心部における不純物蓄積がなく、Neおよび/またはSiの濃度が極めて低く、プラズマの反応性が影響を受けないことを示している。

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textor高精度(タイトル一致)iter中精度(概要文一致)

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TEXTORImproved confinement
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