Impact of plasma density/collisionality on divertor heat flux width

N.M. Li; X.Q. Xu; R.J. Goldston; J.Z. Sun; D.Z. Wang

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Impact of plasma density/collisionality on divertor heat flux width

机译：等离子体密度/收集对转子热通量宽度的影响

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Both ASDEX-Upgrade (AUG) data and the generalized HD (GHD) model showed that the scrape-off width broadens as the density/collisionality increases [1, 2]. A series of BOUT++ transport simulations are performed to study the physics of the scaling characteristics of the divertor heat flux width vs density/collisionality via a plasma density scan with either fixed pressure profile or fixed temperature profile inside separatrix. The simulations show that even in the drift dominated regime, the divertor heat flux width can be broadened due to the transition of the SOL residence time from the parallel particle flow time to the enhanced parallel conduction time as the collisionality/density increases as posited in the GHD model. In addition, the heat flux width is found to be proportional to the square root of ion mass for low collisionality while it has a weakly dependence on ion mass for high collisionality. Furthermore, our simulations show that as the density increases, the radial electric field (E_r) well shallows, which potentially weakens E_r × B flow shear stabilization of turbulence at high density.

机译：Asdex-升级（八）数据和广义高清（GHD）模型显示刮削宽度随着密度/碰撞性增加而变宽[1,2]。进行一系列Bout ++传输模拟，以通过等离子体密度扫描在分离的固定压力曲线或固定温度曲线上通过等离子体密度扫描研究偏移热通量宽度Vs密度/碰撞性的缩放特性的物理学。模拟表明，即使在漂移主导的方案中，也可以通过从平行颗粒流动时间从平行颗粒流动时间转变为增强的平行传导时间，因为施加性/密度随着所处的施加性/密度增加而导致的转移热通量宽度。 GHD模型。此外，热通量宽度被发现与离子质量的平方根成比例，用于低碰撞性，同时它对高碰撞性的离子质量弱依赖性。此外，我们的模拟表明，随着密度的增加，径向电场（E_R）井天使，其潜在地削弱了高密度高密度湍流的e_r×b流剪切稳定。

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来源
《Nuclear fusion》 |2021年第2期|026005.1-026005.9|共9页
作者
N.M. Li; X.Q. Xu; R.J. Goldston; J.Z. Sun; D.Z. Wang;
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作者单位

School of Physics Dalian University of Technology Dalian 116024 China;

Lawrence Livermore National Laboratory Livermore CA 94550 United States of America;

Princeton University Princeton NJ 08543 United States of America;

School of Physics Dalian University of Technology Dalian 116024 China;

School of Physics Dalian University of Technology Dalian 116024 China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
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关键词
BOUT++; collisionality; divertor heat flux width;

机译：bout ++;罚球;置换器热通量宽度;

Impact of plasma density/collisionality on divertor heat flux width

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