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Abstract

Supersonic molecular beam injection (SMBI) is an effective fueling method for the magnetic fusion plasmas. The fueling method was first proposed in the HL-1 tokamak, and now has been applied to several tokamaks and stellarators. Pulsed molecular beam passes from a Laval type nozzle and has a high instantaneous intensity, high directionality and deep deposition in the plasma. The fueling efficiency is higher than the gas puffing efficiency. In addition, it is widely used for controlling plasma density and investigating plasma physics. To further improve the fueling capability in future fusion devices, it is highly desirable to optimize the characteristic of the SMB and further investigate the interactions between the molecular beam and the plasma. In this paper, a schlieren diagnostic system is developed to measure the parameters of molecular beam, and the testing application is performed. The schlieren system, which is based on the schlieren photography, is designed with the zigzag optical path and equipped on the SMBI testing platform to measure the characteristics of the supersonic molecular beam. In order to verify the effectiveness of the system, a series of tests is carried out with different nozzle shapes under atmospheric and vacuum conditions. The beam profiles of CO ₂and D ₂under different background pressures are obtained. The testing results indicate that the directionality of the integrated Laval nozzle is much better than that of the pinhole nozzle. The schlieren system provides a testing tool for optimizing the supersonic molecular beam.

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Authors and contacts

Corresponding author:Zhong Wu-Lü,zhongwl@swip.ac.cn

Funds:Project supported by the National Key R&D Program of China (Grant No. 2017YFE0301106), the Excellent Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 11922503), and the Scientific Research Program for Young Talents of China National Nuclear Corporation

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元件名称	详细参数
光源	彩色LED, 中心波长532 nm, 功率250 W 且连续可调, 带聚焦透镜及风冷
狭缝	圆孔, 直径小于3 mm可调节, 边缘锐利无毛刺
球面反射镜1,2	有效通光口径ϕ150 mm, 焦距2.5 m, 边缘厚度60 mm, 面型精度1/4波长
小反射镜1,2	有效通光口径ϕ50 mm
平面转折镜	有效通光口径ϕ215 mm, 面型精度1/8波长
观察窗1,2	有效通光口径ϕ150 mm, 材质K9, 厚度20 mm
刀口	开启宽度5 mm, 步进精度0.01 mm
装调结构	中心高度1.1 m, 升降调节精度 ±100 mm

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Vol. 69, Issue 21 - 2020-11-05

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