Toward plasma drifts in EMC3: Implementation of gradient, divergence, and particle tracing schemes

IF 1.3 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS
Ruben De Wolf, Felix Reimold, Yuhe Feng, Matthieu Jacobs, Wouter Dekeyser, Giovanni Samaey, Martine Baelmans
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Abstract

This paper presents a first implementation of gradient, divergence, and particle tracing schemes for the EMC3 code, a stochastic 3D plasma fluid code widely employed for edge plasma and impurity transport modeling in tokamaks and stellarators. These schemes are essential to accommodate plasma drift computations, which are currently absent in the code. Plasma drifts have been recognized to significantly influence transport of particles and energy, and their inclusion in future code upgrades will substantially enhance the code's predictive capabilities. For gradient and divergence calculations, we introduce a second-order least-squares gradient scheme. We confirm the second-order convergence properties and assess the accuracy of several analytical test cases in the presence of synthetic noise. In the second part of this paper, we employ the validated gradient scheme in a fourth-order Runge–Kutta particle tracing scheme to trace a particle through a generic drift velocity field. The impact of synthetic noise on the scheme's performance is investigated by evaluating various error metrics. We find that the implemented schemes function as intended and exhibit sufficient accuracy to enable drift computations.

Abstract Image

在 EMC3 中实现等离子体漂移:实施梯度、发散和粒子追踪方案
EMC3是一种随机三维等离子体流体代码,广泛用于托卡马克和恒星器中的边缘等离子体和杂质传输建模。这些方案对于适应等离子体漂移计算至关重要,而目前该代码中还没有等离子体漂移计算。等离子体漂移已被认为会对粒子和能量的传输产生重大影响,在未来的代码升级中加入等离子体漂移将大大增强代码的预测能力。对于梯度和发散计算,我们引入了二阶最小二乘梯度方案。我们确认了二阶收敛特性,并评估了几个存在合成噪声的分析测试案例的准确性。在本文的第二部分,我们在四阶 Runge-Kutta 粒子追踪方案中采用了经过验证的梯度方案,以追踪粒子通过一般漂移速度场的情况。通过评估各种误差指标,研究了合成噪声对方案性能的影响。我们发现,所实施的方案能够发挥预期的功能,并表现出足够的精度,可以进行漂移计算。
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来源期刊
Contributions to Plasma Physics
Contributions to Plasma Physics 物理-物理:流体与等离子体
CiteScore
2.90
自引率
12.50%
发文量
110
审稿时长
4-8 weeks
期刊介绍: Aims and Scope of Contributions to Plasma Physics: Basic physics of low-temperature plasmas; Strongly correlated non-ideal plasmas; Dusty Plasmas; Plasma discharges - microplasmas, reactive, and atmospheric pressure plasmas; Plasma diagnostics; Plasma-surface interaction; Plasma technology; Plasma medicine.
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