Isotopic, Doped Diamond Materials as a Plasma-facing Material for Fusion Power

金刚石具有优异的辐射性能、导热性能和较低的溅射产额，是聚变反应堆中极具吸引力的屏蔽材料。然而，它的主要缺点是高水平的氚滞留，这会导致氚的降解和石墨化，并导致屏蔽性能和稳定性的损失。这项研究项目由EPSRC和UKAEA-CCFE联合开展，旨在评估由碳13/碳12复合材料合成的金刚石材料的性能，这些材料将用作托卡马克聚变反应堆的壁材。实验工作将作为化学学院钻石小组的成员在布里斯托尔进行，并作为实验系的成员在UKAEA Culham的桅杆升级托卡马克上进行。预计学生将花费50%的时间在库勒姆进行实验工作。博士项目将包括培训如何使用化学气相沉积设备生长半导体复合材料的钻石，以及使用最先进的设备，如Bristol NanoESCA进行表征。库勒姆材料研究设施的植入和表征设备也将用于在曝光前和曝光后检查材料。学生还将被要求进行一些计算工作，以支持库勒姆的实验活动。

Diamond is an attractive material for use as a shielding material in fusion reactors due to its exceptional radiation harness, thermal conductivity and low sputtering yield. However, its main disadvantage is the high level of tritium retention which subsequently leads to its degradation and graphitisation and a consequential loss in shielding performance and stability. Also, retention could lead to much higher tritium inventory in fusion power stations which is undesirable for safety and other reasons.Funded jointly by the EPSRC and the UKAEA-CCFE, this research project seeks to evaluate the performance of diamond materials synthesised from Carbon 13/Carbon 12 composites with varying levels of dopant impurities, to be used as a wall material in tokamak fusion reactors. Experimental work will be carried out both at the Bristol as a member of the Diamond Group in the School of Chemistry, and on the MAST Upgrade tokamak at UKAEA Culham, as a member of the Experiments Department. It is expected that the student will spend at up to 50% of their time conducting experimental work based at Culham.The PhD project will involve training in the use of Chemical Vapour Deposition equipment for diamond growth of semiconducting composite materials and their characterisation using state of the art equipment, such as the Bristol NanoESCA. The implantation and characterisation equipment in the Materials Research Facility at Culham will also be available to examine the material pre- and post-exposure. The student will also be expected to conduct some computational work to support the experimental activities at Culham.