锂涂层对多普勒背向散射系统光学性能的影响。

Influence of lithium coating on the optics of Doppler backscatter system.

作者信息

Zhang X H, Liu A D, Zhou C, Hu J Q, Wang M Y, Yu C X, Liu W D, Li H, Lan T, Xie J L

机构信息

Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

出版信息

Rev Sci Instrum. 2015 Oct;86(10):103503. doi: 10.1063/1.4932185.

DOI:10.1063/1.4932185

PMID:26520951

Abstract

This paper presents the first investigation of the effect of lithium coating on the optics of Doppler backscattering. A liquid lithium limiter has been applied in the Experimental Advanced Superconducting Tokamak (EAST), and a Doppler backscattering has been installed in the EAST. A parabolic mirror and a flat mirror located in the vacuum vessel are polluted by lithium. An identical optical system of the Doppler backscattering is set up in laboratory. The power distributions of the emission beam after the two mirrors with and without lithium coating (cleaned before and after), are measured at three different distances under four incident frequencies. The results demonstrate that the influence of the lithium coating on the power distributions are very slight, and the Doppler backscattering can work normally under the dosage of lithium during the 2014 EAST campaign.

摘要

本文首次研究了锂涂层对多普勒背散射光学特性的影响。在实验先进超导托卡马克装置（EAST）中应用了液态锂限制器，并在EAST中安装了多普勒背散射装置。位于真空容器中的抛物面镜和平板镜被锂污染。在实验室中搭建了一个与多普勒背散射相同的光学系统。在四个入射频率下，于三个不同距离测量了有锂涂层（前后清洁）和无锂涂层的两块镜子之后发射光束的功率分布。结果表明，锂涂层对功率分布的影响非常小，并且在2014年EAST运行期间的锂剂量条件下，多普勒背散射能够正常工作。