Understanding the role of chemical interactions on detached divertors in MAST-Upgrade

了解化学相互作用对 MAST-Upgrade 中分离的偏滤器的作用

• 批准号: 2604611
• 金额: --
• 依托单位: University of Liverpool
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2604611
• 关键词: Understanding; role; chemical; interactions; detached

The MAST Upgrade tokamak in Culham will be a world-leading facility to study the physics of divertor detachment, a high density, low temperature (Te < 5eV) regime which is envisaged to be the primary means of moderating divertor heat fluxes in ITER and beyond. The plasma conditions in detached divertors give rise to a plethora of chemical reactions between plasma ions, fuel atoms and molecules (and molecular ions) that can enhance the dissipation of power and momentum from the plasma but presents a serious challenge to capture these interactions in computational models. For example, the transport of chemically reactive species, such as molecular ions, is assumed to be non-existent in state-of-the-art codes in the fusion community, and needs to be addressed.This project aims to perform computational and experimental research on MAST-U to characterise the chemical interactions that take place and the transport of chemically reactive species in the divertor, including H, D & C intrinsic to the divertor, and extrinsic impurities such as N2. A combination of spectroscopic diagnostics and models will be applied to identify the dominant chemical reactions taking place in the divertor, with synthetic diagnostics to aid data interpretation. The aim of this project is to test, and if necessary upgrade, the plasma chemistry models used in modelling codes to improve agreement with experimental observations and their predictive capability. In hopes of providing additional understanding of the exhaust region of spherical tokamaks for use in future prototype devices.During the course of this PhD I will learn how to model complex plasma chemistries using existing codes, understand how to interpret experimental data. I will also gain skills in scientific writing, public speaking and networking.

卡勒姆的MAST升级托卡马克将是研究偏滤器分离物理学的世界领先设施，偏滤器分离是一种高密度、低温（Te <5 eV）状态，预计将成为国际热核聚变实验堆及其他地方减缓偏滤器热通量的主要手段。分离偏滤器中的等离子体条件引起等离子体离子、燃料原子和分子（以及分子离子）之间的过多化学反应，这些化学反应可以增强等离子体的功率和动量的耗散，但在计算模型中捕获这些相互作用是一个严峻的挑战。例如，化学反应性物质（如分子离子）的输运在聚变界的最先进的代码中被认为是不存在的，需要加以解决。本项目旨在对MAST-U进行计算和实验研究，以模拟偏滤器中发生的化学相互作用和化学反应性物质的输运，包括偏滤器固有的H、D和C，以及诸如N2的非本征杂质。光谱诊断和模型的组合将被应用于确定偏滤器中发生的主要化学反应，合成诊断有助于数据解释。该项目的目的是测试，并在必要时升级，等离子体化学模型中使用的建模代码，以提高与实验观察和预测能力的协议。希望为将来的原型装置提供对球形托卡马克排气区的进一步了解。在这个博士课程中，我将学习如何使用现有的代码来模拟复杂的等离子体化学，了解如何解释实验数据。我还将获得科学写作，公开演讲和网络方面的技能。