Title :
ITER coils insulation R&D program
Author :
Vieira, R.F. ; Sugimoto, M. ; Osaki, O. ; Fujioka, T. ; Korsunsky, V. ; Reed, R.P. ; Katheder, H. ; Broadbent, A.
Author_Institution :
ITER Joint Central Team, Naka, Japan
fDate :
30 Sep-5 Oct 1995
Abstract :
The ITER coil insulation systems are required for operating voltages up to 10 kV and to support shear and normal compression loads through the winding pack. Manufacturing considerations and nuclear radiation resistance also influence the choice of suitable systems. A screening program of candidate systems is being conducted in stages. The first stage is reported in this paper. Present R&D data based on small samples indicate a static shear strength of about 85 MPa for a glass or alumina and epoxy resin vacuum pressure impregnation system and 50 MPa for a pre-impregnated glass/epoxy resin system with polyimide interleaved at a temperature of 4 K. The preliminary irradiation results show that coating the steel surface with inorganic materials such as Al 2O3 or ZrO2/8Y2O3 is beneficial in increasing the radiation resistance as far as shear strength is concerned. In addition tetrafunctional epoxy (TGDM) systems appear to be more radiation resistant then diglycidyl ether of bisphenol-A (DGEBA) systems. Further R&D work will focus on prototypical samples to continue evaluation of the performance of the insulation systems
Keywords :
composite insulating materials; fusion reactor materials; fusion reactors; shear strength; superconducting coils; superconducting magnets; 10 kV; 4 K; Al2O3; ITER coils insulation program; ZrO2-Y2O3; alumina-epoxy resin vacuum pressure impregnation system; bisphenol-A systems; diglycidyl ether; fusion reactor materials; glass-epoxy resin vacuum pressure impregnation system; inorganic materials; insulation systems performance; irradiation results; manufacturing considerations; normal compression loads; nuclear radiation resistance; polyimide; preimpregnated glass/epoxy resin system; prototypical samples; radiation resistance; screening program; shear compression loads; static shear strength; steel surface coating; tetrafunctional epoxy systems; winding pack; Coils; Epoxy resins; Glass; Insulation; Manufacturing; Polyimides; Surface resistance; Temperature; Vacuum systems; Voltage;
Conference_Titel :
Fusion Engineering, 1995. SOFE '95. Seeking a New Energy Era., 16th IEEE/NPSS Symposium
Conference_Location :
Champaign, IL
Print_ISBN :
0-7803-2969-4
DOI :
10.1109/FUSION.1995.534511
