Physics of anomalous transport and confinement improvement

异常传输和限制改进的物理学

• 批准号: 09044111
• 负责人: IDA Katsumi
• 金额: $ 2.69万
• 依托单位: National Institute for Fusion Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09044111/
• 关键词: Self sustained transport model; Theory of confinement improvement; Theory of collapse phenomena; Non local transport model; Helical system; Momentum Transport; Spontaneous potential Bifurcation; Internal Transport Barrier; トロイダル・プラズマ; 乱流輸送; 異常輸送

Theoretical research results are (1) Development of self sustained transport model (critical turbulence characteristics, spectral. turbulence), (2) Theory of confinement improvement and guideline for helical system (3) Theory of collapse phenomena.(4)Development of non local transport model. Experimental results are (5) Finding of confinement improvement in Helical system (6) Research of momentum transport (7) Bifurcation of radial electric field. Experimental evidence of micro turbulence in the scale of collisionless electron decay length.The bifurcation surface of radial electric field is predicted theoretically in the structure of radial electric field in torus plasma. The radial electric field bifurcation surface is the surface between the strong positive radial electric field and negative (orweak positive) radial electric field. It is theoretically predicted that the anomalous transport is reduced in the region where the gradient of radial electric field is strong. Theoretically i … More nternal transport barrier is predicted to be produced by this mechanism in helical system.In the conventional anomalous transport mode, the hat flux crossing the magnetic flux is expressed with local plasma parameter at the magnetic flux surface. In the theoretical frame work, it is difficult to explain the fast response for external trigger observed in W7AS device.New non-local transport model is proposed by analyzing the observation in W7AS.The heat flux across the magnetic flux surface is affected by the radial profile of plasma because of the turbulence of long wavelength comparable to the plasma size, In the self sustained transport model, the transition of one turbulence to the other is predicted and theory of collapse phenomena such as ELMs and internal transport barrier collapse is proposed.There is significant development of experiment research. In CHS the transition between the two different profiles of electric potential was observed. This is the first observation for spontaneous electric potential bifurcation in toroidal plasma and supports the hypnosis of bifurcation of radial electric field. The transition between two profiles are continuous and give the impact to steady state helical plasma.These bifurcation is predicted in tokamak plasma as well as helical plasma and plasma flow due to the plasma pressure is theoretically predicted in the momentum transport. The detail experiments on this issue has been done and the relation between the gradient of flow velocity and momentum flux is studied. It is clearly demonstrated that the momentum flux not due to the gradient of flow but the gradient of ion pressure or ion temperature exists in the momentum transport. Less

理论研究结果是（1）开发自我维持的运输模型（关键的湍流特征，光谱。湍流），（2）限制改进理论和螺旋系统指南（3）崩溃现象的理论。（4）非本地运输模型的发展。实验结果是（5）发现螺旋系统的限制改善（6）动量转运的研究（7）径向电场的分叉。无碰撞电衰减长度尺度中微湍流的实验证据。径向电场的分叉表面在圆环等离子体的径向电场结构中被预测。径向电场分叉表面是强radial电场和负（Orweak阳性）径向电场之间的表面。从理论上讲，在径向电场的梯度是理论上I…预计将通过螺旋系统中的机制产生的较大的内部传输屏障的区域，在螺旋系统中产生了异常运输。在常规异常转运模式下，磁通量交叉的磁通量与局部血浆参数表达磁性通量。在理论框架的工作中，很难解释在W7AS设备中观察到的外部触发器的快速响应。新的非局部传输模型是通过分析W7AS中的观察结果而提出的。磁通量表面上的热通量受plux径向的径向影响，受到降低的径向谱的影响，这是由于与较长的湍流相比的繁殖式构图，而自我传递的湍流，该模型的湍流是构成自我湍流的，该模型的湍流是构成自我湍流的，该模型的湍流是构成自我湍流的，并且提出了崩溃现象，例如榆树和内部运输屏障崩溃。实验研究有重大发展。在CHS中，观察到了两个不同电势的过渡。这是在环形血浆中发起电势分叉的首次观察，并支持径向电场分叉的催眠。两个轮廓之间的过渡是连续的，并对稳态螺旋血浆产生了影响。这些分叉在Tokamak血浆以及螺旋血浆和血浆流动中的预测是从理论上预测的，这是在动量转运中预测的。有关此问题的细节实验已经完成，并且研究了流速和动量通量梯度之间的关系。清楚地表明，动量通量不是由于流动的梯度，而是在动量传输中存在离子压或离子温度的梯度。较少的

项目成果

S.-I.ITOH, et al.: "Physics of collapse-probolrilistic occurence of ELMS and Crashes" Plasma Phys.Contr.Fusion. 40(印刷中). (1998)

S.-I.ITOH 等人：“ELMS 和崩溃的崩溃概率发生的物理学”Plasma Phys.Contr.Fusion 40（出版中）。

H.Sanuki: "Studies on wave analysis and electric field in plasmas in Frontier of Physics in Fusion-Relevant Plasmas" World Scientific, Singapore, (1998)

H.Sanuki：“聚变相关等离子体物理学前沿中等离子体波分析和电场的研究”世界科学，新加坡，（1998 年）

T.Kubota, S.-I.Itoh, et al.: "1D Simulation of Sawtooth crash based on transport bifurcation" Plasma Phys.Contr.Fusion. 39. 1397-1407 (1997)

T.Kubota、S.-I.Itoh 等人：“基于传输分叉的锯齿碰撞的一维模拟”Plasma Phys.Contr.Fusion。

S.-I.ITOH, K.ITOH: "Spectrum of subcritical turbulence in an inhomageneous plasma" J.Phys.Soc.Jpn.66. 1571-1574 (1997)

S.-I.ITOH、K.ITOH：“非均匀等离子体中的亚临界湍流谱”J.Phys.Soc.Jpn.66。

K.Itoh, S.-I.Itoh, et al: "Solitary radieal electric field structure in tokamak plasmas" Phys.Plasmas. 5-12. 4121-4123 (1998)

K.Itoh、S.-I.Itoh 等人：“托卡马克等离子体中的孤立径向电场结构”Phys.Plasmas。