A 150 kOe flux-concentrator magnet is described, having a 90 cm3 conical bore 7 cm long and of 10.4 cm maximum diameter. The field is held at peak value ±10% fro 30–50 msec per pulse. The flux concentrator is energized by a transformer-rectifier set delivering 600 V at 3800 A for the duration of the pulse; it is cooled by a closed loop of circulating subcooled liquid nitrogen which in turn is cooled external to the magnet by liquid nitrogen boiling at atmospheric pressure.
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