Two sets of pure deuterium plasmas are simulated using UEDGE, one including atoms and molecules and the other including atoms only as separate fluid species. Simulation results in one and two dimensions are reported to assess the role of molecules in tokamak plasmas. It is shown that thermal coupling of the molecules to the plasma can be relevant for the onset of detachment under highly collisional conditions in simple geometries, but play a modest role at low collisionality. Ion‐molecule equipartition presents an additional ion energy loss channel, dissipating ion energy that would otherwise heat the electrons by equipartition. The resulting reduced electron temperature increases the ion‐electron recombination by an order of magnitude as the plasma density is increased, yielding earlier and deeper detachment.

中文翻译：

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UEDGE中扩展的氢分子模型的实现和评估

使用UEDGE模拟了两组纯氘等离子体，一组包含原子和分子，另一组仅包含原子作为单独的流体种类。一维和二维的模拟结果据报道可评估分子在托卡马克等离子体中的作用。结果表明，分子与等离子体的热偶合可能与在简单几何结构中高度碰撞条件下的脱离开始有关，但在低碰撞性下起适度的作用。离子分子均分提供了一个额外的离子能量损失通道，耗散了离子能量，否则该离子会通过均分加热电子。随着等离子体密度的增加，最终降低的电子温度使离子-电子复合增加了一个数量级，从而产生了更早更深的分离。