Abstract

Fusion alpha heating introduces new phenomena into plasma dynamics and control. On the worrisome side is the well-known fact that the ${⟨\sigma \upsilon ⟩}_{fus}\simeq T_{ion}^2$ dependence of the predominantly central fusion heating mechanism, coupled with the less appreciated fact of the predominantly plasma edge location of bremsstrahlung and impurity line and recombination radiation cooling and of ion orbit loss cooling, suggests the possibility of a thermal runaway fusion power excursion in the plasma core. On the encouraging side is the fact that the fusion alpha energy is transferred first to heat the core electrons and produce electron cyclotron radiation that is transferred instantaneously, predominantly to outer plasma regions and the surrounding material wall, reducing its availability for further heating of core plasma ions. This paper discusses the temporal and spatial dependence of the various heating and cooling mechanisms involved in the burn dynamics of a fusion plasma, introduces a spatially coarse nodal space-time calculation model (suitable for dynamics and controller calculations) for the analysis of burning plasmas, and identifies the research needed to fully evaluate the parameters of such a model.

摘要

聚变α加热将新现象引入等离子体动力学和控制。令人担忧的是，众所周知的事实是，${⟨\sigma \upsilon ⟩}_{Füs}\simeq {Ť}_{\mathrm{一世}Øñ}^{\mathrm{2个}}$依赖于主要的中央聚变加热机制，再加上鲜为人知的fact致辐射和杂质线的等离子体边缘位置以及复合辐射冷却和离子轨道损失冷却的事实，人们不太可能想到等离子体中的热失控聚变功率漂移核。令人鼓舞的是，聚变α能量首先被转移以加热核心电子并产生电子回旋辐射，该回旋辐射瞬间被转移，主要转移到外部等离子体区域和周围的材料壁，从而降低了其进一步用于加热核心等离子体的能力。离子。本文讨论了与聚变等离子体的燃烧动力学有关的各种加热和冷却机制的时间和空间依赖性，