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Interpretation of density limits and the H-mode operational diagram through similarity parameters for edge transport mechanisms

机译：通过边缘传输机制的相似性参数解释密度极限和H模式操作图

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ELMy H-modes are currently a promising scenario envisaged for the operation of a future fusion reactor. The reliable extrapolation of the present experimental data to a reactor requires a model which is capable of explaining the variety of experimental phenomena observed in high-density H-modes. This paper attempts to construct a model based on the assumption that the behaviour of high-density ELMy H-modes can be explained through the similarity of edge transport mechanisms. We have identified three dimensionless parameters as the most representative for the high-density H-mode operation: (a) F-beta = q(2) R del beta/f(s) representing the ideal ballooning limit, (b) collisionality nu(e)* = Z(eff)nqR/T-e(2) which is postulated to be responsible for the transition from type I to type III edge localized modes (ELMs) and (c) the L-H transition boundary represented by FL-H = T-e(3)/((BL)-L-2 (perpendicular to) Z(eff)/root m(i)). Fixing any two out of these three parameters allows one to find scalings for the main operational points in the edge n(e)-T-e diagram and reproduce the Greenwald/Hugill dependences: (n) over bar(e) similar to B/qR for density limits. More detailed scalings for the type I to type III ELM transition point, which may be of particular interest for a reactor, show that the critical separatrix density should scale as n(e) similar to B-alpha/q(beta) R-gamma, where alpha approximate to 1, beta > 1, gamma < 1 (but being close to unity) and q is assumed to be the safety factor at 95% of the flux, q(95). Good agreement is found between experimental results on JET for the density at the top of the pedestal and the scaling (n) over bar(e) similar to B/R(3/4)q(5/4) for the critical separatrix density at the transition, in the conditions where the two densities are expected to be proportional to each other. [References: 43]
机译：ELMy H模式目前是未来聚变反应堆运行的理想方案。将当前实验数据可靠地外推到反应堆需要一个模型，该模型能够解释在高密度H模式下观察到的各种实验现象。本文尝试基于这样的假设来构建模型，即可以通过边缘传输机制的相似性来解释高密度ELMy H模式的行为。我们确定了三个无因次参数，它们是高密度H模式操作的最有代表性的参数：（a）F-beta = q（2）R del beta / f（s）代表理想的膨胀极限，（b）碰撞性nu （e）* = Z（eff）nqR / Te（2）假定负责从I型到III型边缘局部模式（ELMs）的过渡，并且（c）由FL-H表示的LH过渡边界= Te（3）/（（BL）-L-2（垂直于Z（eff）/根m（i）））。固定这三个参数中的任何两个参数，就可以找到边缘n（e）-Te图中主要操作点的比例，并重现Greenwald / Hugill依赖关系：（n）在bar（e）上类似于B / qR密度极限。对于I型到III型ELM过渡点的更详细的缩放比例，这可能是反应堆特别感兴趣的结果，它表明临界分离密度应按n（e）缩放，类似于B-alpha /qβR-γ ，其中alpha近似等于1，beta> 1，gamma <1（但接近于单位），q被认为是在磁通量q（95）的95％时的安全系数。在JET的实验结果中，基座顶部的密度与bar（e）上的缩放比例（n）相似，类似于临界分离密度的B / R（3/4）q（5/4）在过渡时，在两个密度预计彼此成比例的情况下。 [参考：43]

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