Atomic Processes for Magnetic Fusion Plasmas: Dielectronic Recombination of the Tungsten Isonuclear Sequence

作为一种安全、清洁的未来能源，磁聚变正受到全世界的广泛研究。目前的机器包括英国的JET和德国的ASDEX，而下一步机器ITER目前正在法国建设中。这些机器中物质的状态——温度和密度的分布、化学成分、流速——可以通过对观测数据的诊断分析来确定，在这种分析中，模型结合了物体的全部物理特性，与观测结果相比较。这些信息是我们理解磁聚变等离子体行为的基础，也是利用它们的关键，例如通过拟议的DEMO示范发电厂。电子与原子、离子和分子的碰撞在描述磁聚变等离子体中起着基本的作用。钨在当前（JET/ASDEX）和未来（ITER）机器中的重要地位是原子物理学和基于它的建模的挑战。我们提出了一系列计算，这些计算对于可靠地模拟和解释这些等离子体的观测是必不可少的。我们还将开展适用于当前机器的此类建模。

Magnetic fusion is under intense study through-out the world as a safe and clean energy source for the future.Present day machines include JET in the UK and ASDEX in Germany, while the next step machine ITER iscurrently under construction in France.The state of matter in these machines --- the distribution of temperature and density, chemical composition,flow velocities --- can be determined through diagnostic analysis of observational data in which models,incorporating the full physics of the object, confront the observations. This information is fundamental for our understanding of the behaviour of magnetic fusion plasmasand key to harnessing them, e.g. via the proposed DEMO demonstration power plant.Collisions of electrons with atoms, ions and molecules play a fundamental role in characterizing magnetic fusion plasmas. The important fole of tungsten in present (JET/ASDEX) and future (ITER) machines is a challenge for atomic physics and modelling based upon it.We propose a series of calculations which are essential to reliably model and interpret observationsfrom these plasmas. We will also carry-out such modelling applicable to the present day machines.