Fatigue assessment of the conductor jacket for the NET TF and PF coils
- Imperial College of Science, Technology and Medicine, London (United Kingdom)
- Max-Planch Inst. fur Plasma Physik, Garching (France)
The NET (Next European Torus) machine relies on superconducting coils to generate the field necessary to confine plasma. These coils fall into essentially two groups, the toroidal field (TF) coils and the poloidal field (PF) coils. There are a number of designs under consideration for the superconductor that will eventually be used in these coils. The superconductor is in close contact with copper stabilizer which provides an alternative current path should the superconductor become normal conducting, and is enclosed in a jacket to give strength and to protect the delicate super-conductor strands. The jacket is filled with liquid helium in order to maintain the temperature inside the coil at 4{degrees}K which is expected to be the operational temperature. The toroidal field (TF) coils and the poloidal field (PF) coils jackets are both subjected to a variety of complex stresses during the fabrication stage and in the operating condition. In such circumstances clear boundary conditions for elastic or elasto/plastic stress analysis are difficult to specify and therefore the effects of applied boundary conditions on the analytical results must be subject to careful scrutiny. The application of fracture mechanics and fatigue life prediction procedures are used to evaluate safe limits of cracks in the stages of the NET toroidal field (TF) coils and the poloidal field (PF) coils.
- OSTI ID:
- 197007
- Report Number(s):
- CONF-940664--
- Country of Publication:
- United States
- Language:
- English
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