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

金刚石因其优异的辐射性能、导热性和低溅射率而成为聚变反应堆屏蔽材料的理想材料。然而，它的主要缺点是高水平的氚保留，随后导致其降解和石墨化，从而导致屏蔽性能和稳定性的损失。此外，核聚变电站的滞留可能导致更高的氚库存，这是出于安全和其他原因所不希望看到的。该研究项目由EPSRC和ukea - ccfe联合资助，旨在评估由碳13/碳12复合材料合成的金刚石材料的性能，这些材料含有不同水平的掺杂杂质，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，作为实验部门的成员在UKAEA Culham的MAST升级托卡马克上进行。预计学生将花费高达50%的时间在卡拉姆进行实验工作。博士项目将包括使用化学气相沉积设备进行半导体复合材料金刚石生长的培训，并使用最先进的设备（如Bristol NanoESCA）对其进行表征。位于Culham的材料研究设施中的植入和表征设备也可用于检查材料暴露前后的情况。学生还需要进行一些计算工作来支持在Culham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.