Final engineering report on the dual mode magnet for the high performance demonstration experiment

Technical Report · Fri Jul 01 04:00:00 EDT 1977

DOI:https://doi.org/10.2172/5096795· OSTI ID:5096795

Averill, R. J.; Hay, R. D.; Langton, W. G.; Rapperport, E. J.

The magnet for the MHD High Performance Demonstration Experiment is designed to provide (at 27 MW and 16,000 amp) a peak field of 6 T when pulsed from 77/sup 0/K (LN/sub 2/) and 3.5 T when operated continuously water-cooled. The magnet bore is 0.89 m wide by 0.71 m high at the entrance, 1.4 m wide by 1.17 m high at the exit, and the poles are 7.1 m long. The total length of the magnet (not including the sideplates of the force containment structure) is 9.16 m. The magnet saddle coils consist of 720 turns of copper hollow conductor, 2.5 cm square with a 0.66 cm diam cooling passage. The copper hollow conductor is electrically insulated with 0.018 cm thick half-lapped B-stage epoxy impregnated tape and then 0.010 cm thick Mylar taped half-lapped to provide 0.056 cm of insulation on each turn. The coils are constructed in eighteen ''pancakes'' of 40 turns in two layers. The large Lorentz forces generated at the peak of the 6 T pulse are contained by an aluminum force containment structure. The large aluminum components are fitted together using interlocking tongue grooves and keyways to contain the large forces. The force containment structure and coils are surrounded by styrofoam insulation (ranging from 7.62 cm to 15.24 cm thick) on the outside and a 2.54 cm thick vacuum insulating box inside the bore. The steel return frame is located outside the thermal insulation.

• Research Organization: Magnetic Engineering Associates, Inc., Cambridge, Mass. (USA)
• DOE Contract Number: EX-76-A-01-1542
• OSTI ID: 5096795
• Report Number(s): FE-1542-3
• Country of Publication: United States
• Language: English

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