Thermo-mechanical design of the extraction grids for RF negative ion source at HUST

•An extraction system with cooling channels has been designed for HUST negative ion source.•Corresponding heat loads onto three grids has been used in thermo-mechanical analysis.•The analysis results could be very useful for driving the engineering design. Huazhong University of Science and Technolo...

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Bibliographic Details
Published in:Fusion engineering and design 2017-01, Vol.114, p.1-5
Main Authors: Zuo, Chen, Liu, Kaifeng, Li, Dong, Mei, Zhiyuan, Zhang, Zhe, Chen, Dezhi
Format: Article
Language:English
Subjects:
Beam injection
Circuit design
Computational fluid dynamics
Cooling
Cooling systems
Deformation
Design optimization
Design parameters
Extraction system
Feature extraction
Finite element method
Grids
Ion extraction
Ion sources
Ions
Loads (forces)
Mathematical analysis
Negative ion source
Negative ions
Neutral beams
Radio frequency
Smart grid technology
Thermal cycling
Thermo-mechanical analysis
Thermogravimetric analysis
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Summary:•An extraction system with cooling channels has been designed for HUST negative ion source.•Corresponding heat loads onto three grids has been used in thermo-mechanical analysis.•The analysis results could be very useful for driving the engineering design. Huazhong University of Science and Technology (HUST) is developing a small radio frequency negative ion source experimental setup to promote research on neutral beam injection ion sources. The extraction system for the negative ion source is the key component to obtain the negative ions. The extraction system is composed of three grids: the plasma grid, the extraction grid and the grounded grid. Each grid is impacted by different heat loads. As the grids have to fulfil specific requirements regarding ion extraction, beam optics, and thermo-mechanical issues, grid cooling systems have been included for ensuring reliable operation. This paper focuses on the thermo-hydraulic and thermo-mechanical design of the grids. Finite element calculations have been carried out to analyse the temperature and deformation of the grids under heat loads using the fluid dynamics code CFX. Based on these results, the cooling circuit design and cooling parameters are optimised to satisfy the grid requirements.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2016.10.016