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Overview of Edge Modeling Efforts at ASIPP

朱思铮

中国科学院等离子体物理所

2011.11.26

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• 模拟与实验分析解释实验，并由实验结果检验改进程序（ Validation ）

-- 〉提高预测能力，为实验提供理论支持。

• 模拟与工程对 EAST 偏滤器进行优化，进一步改善偏滤器性能

-- 〉保障下一步更高功率、更大热负荷条件下的长脉冲 运行。

主要模拟程序SOLPS

ASIPP 边界等离子体模拟课题研究内容

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- SOLPS4: grid to the wall, comprehensive neutral model, parallelization

- SOLPS5: drifts, currents, high-Z impurity transport

Various SOLPS Versions

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Urgent SOLPS upgrade needs for ITER

Plasma interaction with first wall Grid to the wall, radial transport, wall model

W divertor W erosion and transport, impurity seeding(particle balance for high-Z impurities – not solved yet!)

The best available models for plasma and neutrals together Merging SOLPS4 and SOLPS5

Performance improvement in parallel processing environment - CPU development: massive parallel computations - Parallelisation of the B2/B2.5 Improvement is needed to fit modern computers

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1) Coupling of SOLPS5.2 with EIRENE-PARALLEL (2009) to form SOLPS5.3.

2) Extend the existing SOLPS4/5 benchmarking exercise: SOLPS4.3 versus SOLPS5.3.

3) Consult with the SOLPS community and produce a report detailing the advantages and disadvantages of moving the ITER design modelling effort from SOLPS 4 to 5.

Whether or not ITER design activity should be upgraded from SOLPS4 to SOLPS5

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EAST 实验已经取得了 2 秒 H-mode 、 100 秒长脉冲和 1MA 等离子体电流的好结果，其中 lithium 的应用起了很大作用。

理论模拟将加强与实验的结合：

• 在对实验的模拟和解释中，加入漂移和电流的影响。

• 进行 H-mode 条件下的偏滤器物理模拟。

• 模拟 Li 对 PFC 上再循环和对边界等离子体输运的影响。

一 . 模拟与实验

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1.1 Problems in SOLPS5.0 with drifts- Small time step is required for L-mode- Absence of convergence for H-mode

SOLPS modelling of AUG H-mode plasmaA.V. Chankin et al, 2006Most of the cases were run without drifts since their inclusion introduced severe numerical problems, leading to a dramatic reduction in the required time step.Code development for ITER edge modelling – SOLPS5.1X. Bonnin et al, 2009However, the numerics of the drifts in SOLPS5.x are not yet entirely satisfactory, therefore some effort is invested into improving the code stability and increasing the domain of convergence.

SOLPS5 modlling of the type III ELMing H-mode on TCVB. Gulejova et al, 2007no drifts have been included at this stageTime-dependent modelling of ELMing H-mode at TCV with SOLPS5B. Gulejova et al, 2007no drift terms are activatedSOLPS5 simulations of Type I ELMing H-mode at JETB. Gulejova et al, 2009The highest level of complexity (namely the inclusion of drifts) is not attempted here since they were not included in the original EDGE2D-NIMBUS simulations.

1. H-mode 边界等离子体模拟

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1.2 SOLPS5.2

• Developed for the simulation of H-mode shots.

• Convergence was demonstrated for an ASDEX Upgrade, H-mode, inter-ELM simulation with the full drift model included [Rozhansky 2009] (fluid neutral particle model).

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1.3 Kinetic modulefor parallel plasma transport in the SOL and divertor

• SOL energy transport during transientType I ELM phases of the H-mode discharges needs a true kinetic simulation.

• Parallel Kinetic module solves along field lines, exchange (particle, heat) between flux surfaces.

• Kinetic module + SOLPS: realisticχ||, thermoforce coeff., target heat γ,ionization/excitation coeff.

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2. 模拟 Li 对边界等离子体输运的影响

Lithium -- 〉 High D pumping

SOLPS - Vary the recycling coefficient R of deuterium ions and neutrals pumped by lithium coated surface.

SOLPS/(ERO,EDDY?) Plasma edge/SOL code + sputtering, erosion/redeposition code- 〉 calculate full SOL lithium profile.

• EMC3-Eirene ( 东华大学合作）

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3. 边界等离子体中的径向输运模拟

3.1 Convective cross field transport ：Blobs – transport via coherent structures

• SOLPSDiffusion-convective model – the outward radial convective velocity Vc(r) is strongly inhomogeneous in the poloidal direction in agreement with blobby plasma transport.

• BOUT (Edge turbulence, ELM, Blob)

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3.2 SOLPS modelling including the main chamber wall

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1. EAST 内部结构改造：• 模拟第一壁材料改变后，杂质输运和辐射变化对靶板热负荷的影响。• 模拟（提议中？） dome 位置的改变，对杂质屏蔽和抽气效率的影响，优化偏滤器位形。

2011 2012 2013 2014 2015

PFC Mo/C

Li coating

Mo/W/C

Li coating

Mo/W

Li coating

Mo/W

Floaing LLD

W

Floaing LLD

Power

（ MW ）

10.5 14.5 24.5 24.5 24.5

Duration

（ s ）100 200 300 400 400

二 . 模拟和工程

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2. W divertor

Profiles of Zeff with and w/o bundling of Ar states and CX processes

Different W bundles used

2.1 “bundled charge states” model

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2.2 SOLPS/DIVIMP - tungsten erosion and deposition利用杂质输运程序 DIVIMP 和 SOLPS 产生的背景等离子体，详细模拟研究 W 的溅射和再沉积，以及在边界等离子体中的输运过程等。

2.3 EMC3-Eirene ( 东华大学合作）

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三 . 集成模拟ONETWO-SOLPS 初步开展 SOLPS 边界模拟与芯部输运程序 ONETWO 相耦合的工作，从总体上研究边界等离子体和芯部等离子体的行为及其相互影响。

国外 Core-Edge 集成模拟FACETS ASTRA-SOLPSJINTRAC – Jet INtegrated TRAnsport Code

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SOLPS integrated with ASTRA (core)

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Some topics related to SOL

- Absorption of LHW in the SOL

- Scattering of RFW by blob-filaments

- Interaction of SOL with MHD instabilities (tearing mode, RWM)