Investigation of the adhesive bonding technology for the insulator structure of EAST neutral beam injector

A key issue on the development of EAST ion source was the junction design of insulator structure, which consists of three insulators and four supporting flanges of electrode grid. Because the ion source is installed on the vertical plane, the insulator structure has to withstand large bending and sh...

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Bibliographic Details
Published in:Review of scientific instruments 2014-07, Vol.85 (7), p.073504-073504
Main Authors: Wei, Jiang-Long, Li, Jun, Hu, Chun-Dong, Xie, Ya-Hong, Jing, Hao
Format: Article
Language:English
Subjects:
Adhesive bonding
Adhesive strength
ADHESIVES
BEAM INJECTION
BONDING
Bonding strength
DESIGN
ELECTRIC CONTACTS
ELECTRIC POTENTIAL
ENGINEERING
EPOXIDES
Epoxy resins
Flanges
High voltages
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Insulators
ION SOURCES
Maximum bending
Mechanical analysis
MECHANICAL TESTS
Neutral beams
NEUTRAL PARTICLES
PRESSURE RANGE MEGA PA
Scientific apparatus & instruments
SHEAR
Shear stress
STAINLESS STEELS
STRESSES
TENSILE PROPERTIES
TOKAMAK DEVICES
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Summary:A key issue on the development of EAST ion source was the junction design of insulator structure, which consists of three insulators and four supporting flanges of electrode grid. Because the ion source is installed on the vertical plane, the insulator structure has to withstand large bending and shear stress due to the gravity of whole ion source. Through a mechanical analysis, it was calculated that the maximum bending normal stress was 0.34 MPa and shear stress was 0.23 MPa on the insulator structure. Due to the advantages of simplicity and high strength, the adhesive bonding technology was applied to the junction of insulator structure. A tensile testing campaign of different junction designs between insulator and supporting flange was performed, and a junction design of stainless steel and fiber enhanced epoxy resin with epoxy adhesive was determined. The insulator structure based on the determined design can satisfy both the requirements of high-voltage holding and mechanical strength.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4890563