Development and testing of 140 GHz absorber coatings for the water baffle of W7-X cryopumps
Development and testing of 140 GHz absorber coatings for the water baffle of W7-X cryopumps
复制标题
W7-X 低温泵水挡板的 140 GHz 吸收涂层的开发和测试
DOI：
10.1016/j.fusengdes.2010.12.015
复制
发表时间：
2011
影响因子：
1.7
通讯作者：
W. Kasparek
中科院分区：
文献类型：
--
作者：
M. Floristán;P. Müller;A. Gebhardt;A. Killinger;R. Gadow;A. Cardella;C. Li;R. Stadler;G. Zangl;M. Hirsch;H. Laqua;W. Kasparek
由于来自W7-X低温泵的电子回旋加速器射频加热系统的相对高的杂散场辐射（140 GHz），已经为水冷挡板屏蔽开发了用作140 GHz辐射的有效吸收剂的涂层系统，以减少液氮屏蔽和液氦低温板上的热负荷。采用大气等离子喷涂技术在平面铜基体上制备了几种氧化物陶瓷涂层。分析了工艺参数对涂层性能和吸波性能的影响。结果表明，涂层的厚度和微观结构对涂层的微波吸收性能有显著影响。Al_2O_3/TiO_2涂层对140 GHz探测光的吸收率大于90%。在优化涂层结构以实现最大微波吸收后，通过特殊的机器人轨迹使涂层过程适应复杂的水挡板几何形状。选定的喷涂参数和运动学，然后用于四个实体模型，这已经在W7-X杂散场测试设施米斯特拉尔完成涂层。模型显示吸收值为75%。
Due to the relatively high strayfield radiation (140GHz) from the electron cyclotron radio frequency heating system to which the W7-X cryopumps are expected to be subjected, coating systems acting as an efficient absorber for 140GHz radiation have been developed for the water-cooled baffle shield in order to reduce the thermal load on the liquid N shield and the liquid He cryopanel. Several types of oxide ceramic coatings were applied on planar copper substrates by Atmospheric Plasma Spraying. The influence of the process parameters on the coating properties and microwave absorbing capability was analysed. It was found that film thickness and microstructure of the sprayed coatings have a significant influence on microwave absorption behaviour. For Al2O3/TiO2coatings, absorption values over 90% were obtained for the 140GHz probing beam. After optimisation of the coating structure for maximum microwave absorption, the coating procedure was adapted by special robot trajectories to the complex water baffle geometry. The selected spray parameters and kinematics were then used for the complete coating of four mock-ups, which have been tested in the W7-X strayfield test facility Mistral. The mock-ups showed absorption values of 75%.