DC CICC retrofit magnet

Technical Report · Fri Oct 30 04:00:00 EST 1992

DOI:https://doi.org/10.2172/6830138· OSTI ID:6830138

Myatt, R L; Marston, P G

The coil system presented here for the MHD retrofit magnet incorporates many features of the latest in superconducting magnet technology and finite element modeling to create an efficient and viable design concept. At the core of the design is the niobium titanium (NbTi) superconducting Cable-in-Conduit Conductor (CICC). Engineered to create moderately high magnetic fields (up to 8 T) with essentially no power loss, this specific CICC design provides good load carrying capacity, operating margin from a perturbation such as a local heat input, and coil protection in the event of a quench transient. The CICC is wound on a mandrel into long, tapered, saddle shaped single conductor thickness pancakes. By defining the appropriate number of conductor turns in each pancake, the saddle coils can be stacked to form a semi-elliptical winding pack cross section. Extruded aluminum filler blocks are fitted into the steps, at the edge of the pancake and present a smooth surface to the supporting structure. The semi-elliptical conductor array is supported by an identically shaped strap at all locations except where the end turns sweep over the MHD channel. The strap resists the electromagnetic forces tending to separate the coils on each side of the channel. Low friction surfaces are placed between conductor pancakes, and between the inside skin of the support straps and the outside surface of the conductor winding pack. This allows relative movement between pancakes, and between the strap and coil, thereby reducing shear stresses and coulombic friction heating which would otherwise tend to crack insulation, load joints, and initiate a quench in the superconducting cable.

• Research Organization: Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-90PC90350
• OSTI ID: 6830138
• Report Number(s): DOE/PC/90350-6; PFC/RR--92-14; ON: DE93006013
• Country of Publication: United States
• Language: English

Related Subjects

665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
DESIGN
DOCUMENT TYPES
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
FLUID MECHANICS
HYDRODYNAMICS
MAGNETOHYDRODYNAMICS
MAGNETS
MECHANICS
NIOBIUM ALLOYS
PROGRESS REPORT
STRESS ANALYSIS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
TITANIUM ALLOYS