High-field superconducting solenoids for the TIBER II PF (poloidal-field) system
The poloidal-field (PF) coil set for the Tokamak Ignition/Burn Engineering Reactor (TIBER-II) consists of 24 solenoid modules, 16 of which are stacked inside the toroidal-field (TF) system at the center of the machine. These central solenoid modules operate at high-current densities, and maximum fields at the windings approach 14 T. Although TIBER-II is designed for steady-state operation with noninductive current drive, other operating scenarios are also considered. In the pulsed or inductive mode, PF coil currents are ramped to induce plasma current. In this mode, peak fields approaching 14 T appear on the central solenoid modules at the ends of the stack; the required current densities in these modules approach 40 A . mm/sup 2/. The central solenoid modules are layer wound using cable-in-conduit conductor (CICC) with (NbTi)/sub 3/Sn composite strands for improved high-field performance. Layer winding permits grading the conductor for maximum overall winding-pack current density and also results in less wasted space in the radial build of the machine. Cooling connections may be made at each layer of a module as needed. Current leads to the modules are routed through the high-field central bore. The central solenoid modules can easily support the centering load of the PF system, reducing the overall radial build of the machine and greatly increasing the limit on the number of pulse cycles imposed by fatigue considerations in the central solenoid. 5 refs., 3 figs., 2 tabs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5577463
- Report Number(s):
- UCRL-96864; CONF-871007-75; ON: DE88004400
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700202* -- Fusion Power Plant Technology-- Magnet Coils & Fields
CURRENT DENSITY
DESIGN
DIVERTORS
ELECTRIC COILS
ELECTRICAL EQUIPMENT
EQUIPMENT
POLOIDAL FIELD DIVERTORS
SOLENOIDS
STRAINS
SUPERCONDUCTING COILS
THERMONUCLEAR REACTORS
TIBER-X TOKAMAK
TOKAMAK TYPE REACTORS