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Monte Carlo guiding-centre simulations of E×B flow shear inedge transport barrier

T P Kiviniemi, J A Heikkinen, A G Peeters, S K Sipilä2001年Plasma Physics and Controlled FusionIF 2.2出版社

Er×B flow shear is simulated with a fully kinetic five-dimensionalneoclassical Monte Carlo simulation both for JET and ASDEX Upgrade. Here,Er is the radial electric field and B is the magnetic field. It is shownthat high enough shear for turbulence suppression can be driven at low (L)to high (H) transition conditions without taking into account anomalousprocesses in Er shear formation. For typical plasma parameters, at a certainedge temperature, shear is weaker in JET than in ASDEX Upgrade, thus requiringa higher edge temperature for L-H transition as observed also in experiments.However, although the simulation is carried out at experimentally observed L-Htransition temperatures of each device, shear is still weaker in JET, whichproposes that the critical shear in JET should be lower than in ASDEX Upgrade.The parametric dependence of the shear on temperature, density and magnetic fieldis investigated and the effects of density and temperature gradients, plasmacurrent and the direction of the ∇B drift on the shear are discussed.

日本語訳

Er×Bフローシアーは、JETとASDEX Upgradeの両方に対して、完全運動論的5次元新古典モンテカルロシミュレーションを用いてシミュレーションされる。ここで、Erは動径電場、Bは磁場である。乱流抑制に十分な高いシアーが、Erシアー形成における異常過程を考慮せずに、低(L)から高(H)遷移条件において駆動され得ることが示される。典型的なプラズマパラメータでは、特定のエッジ温度において、シアーはASDEX UpgradeよりもJETの方が弱く、したがって実験でも観測されるように、L-H遷移にはより高いエッジ温度が必要となる。しかしながら、各装置の実験的に観測されたL-H遷移温度でシミュレーションが実行されるものの、シアーは依然としてJETの方が弱く、これはJETにおける臨界シアーがASDEX Upgradeよりも低いはずであることを示唆する。シアーの温度、密度、磁場に対するパラメトリック依存性が調査され、密度勾配、温度勾配、プラズマ電流、および∇Bドリフトの方向がシアーに及ぼす影響が議論される。

装置

asdex-upgrade低精度(概要文一致)jet低精度(概要文一致)

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Transport barrierMonte CarloFlow shear
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