Modelling of power exhaust in TCV positive and negative triangularity L-mode plasmas

IF 2.1 2区物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS Plasma Physics and Controlled Fusion Pub Date : 2024-04-17 DOI:10.1088/1361-6587/ad3c19

E Tonello, F Mombelli, O Février, G Alberti, T Bolzonella, G Durr-Legoupil-Nicoud, S Gorno, H Reimerdes, C Theiler, N Vianello, M Passoni, the TCV Team and the WPTE Team

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Abstract

L-mode negative triangularity (NT) operation is a promising alternative to the positive triangularity (PT) H-mode as a high-confinement edge localised mode-free operational regime. In this work, two TCV Ohmic L-mode core density ramps with opposite triangularity are investigated using SOLPS-ITER modelling. This numerical study aims to investigate the power exhaust differences between NT and PT focusing, in particular, on the geometrical effect of triangularity. To disentangle the latter from differences related to cross-field transport, anomalous diffusivities for particle ( ) and energy ( ) transport are fixed to the same values in PT and NT. The simulation results clearly show dissimilar transport and accumulation of neutral particles in the scrape-off layer for the two configurations. This gives rise to different ionization sources in the edge and divertor regions and produces differences in the poloidal and cross-field fluxes, ultimately leading to different power and particle divertor fluxes in the two configurations. Simulations recover the experimental feature of a hotter and attached outer target ( ) in the NT scenario compared to the PT counterpart.

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TCV 正三角和负三角 L 型等离子体中的功率排气建模

L 模式负三角形（NT）运行是正三角形（PT）H 模式的一种很有前途的替代方案，是一种高引信边缘局部无模式运行机制。在这项工作中，使用 SOLPS-ITER 模型研究了两个具有相反三角形的 TCV 欧姆 L 模式磁芯密度斜坡。这项数值研究旨在调查 NT 和 PT 的功率耗尽差异，尤其侧重于三角形的几何效应。为了将后者与跨场传输的差异区分开来，粒子（）和能量（）传输的反常扩散率在 PT 和 NT 中被固定为相同的值。模拟结果清楚地表明，在两种配置下，中性粒子在刮除层中的传输和积累是不同的。这导致边缘和分流器区域产生不同的电离源，并产生不同的极射和跨场通量，最终导致两种配置中不同的功率和粒子分流器通量。模拟恢复了实验特征，即与 PT 相比，NT 方案中的外部目标（）温度更高，附着力更强。

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来源期刊

Plasma Physics and Controlled Fusion 物理-物理：核物理

CiteScore

4.50

自引率

13.60%

发文量

224

审稿时长

4.5 months

期刊介绍： Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods. Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.