Title :
Beamline duct gas release conditioning and the upgraded duct wall protection system of the JET neutral injectors
Author :
Bickley, A.J. ; Jones, T.T.C. ; Papastergiou, S. ; Challis, C.D. ; Davies, J.F. ; de Esch, H.P.L. ; Stork, D. ; Altmann, H.
Author_Institution :
JET Joint Undertaking, Abingdon, UK
Abstract :
During injection of neutral beams into the JET (Joint European Torus) Tokamak, there have been three occasions when damage to the water-cooled duct liner has occurred due to re-ionization within the duct region. As a result, improved duct protection and direct fast-response pressure gauges have been installed. The pressure measurements are analyzed in terms of a gas reemission coefficient, and results for various surface conditions have been obtained. The mechanical design of an improved duct protection system is also presented
Keywords :
Tokamak devices; fusion reactor theory and design; JET; Joint European Torus; direct fast-response pressure gauges; duct gas release conditioning; duct protection; gas reemission coefficient; neutral beams; water-cooled duct liner; Copper; Ducts; Fluid flow; History; Laser excitation; Particle beams; Production; Protection; Vacuum systems; Valves;
Conference_Titel :
Fusion Engineering, 1989. Proceedings., IEEE Thirteenth Symposium on
Conference_Location :
Knoxville, TN
DOI :
10.1109/FUSION.1989.102481
