55 T long pulse magnet reinforced by ice and woven-glass cloths

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Abstract
A simple method of constructing a multilayer wire-wound pulse magnet was developed by using ice with woven-glass cloth as a reinforcement spacer. Employing strong copper-wire embedded with Nb-Ti filaments, magnetic fields up to 58 T were generated within an 18 mm bore-diameter with a pulse duration of about 8 ms. Even with soft copper-wire, magnetic fields of over 45 T were produced. The advantages of this method are: easy construction of the magnet, without any troublesome processes such as epoxy impregnation or high-pressure solidification; fast cooling time after a large current discharge; recovery from fatigued insulation after multiple use by a process of warming up the magnet once to room temperature and cooling it again to liquid nitrogen temperature, forming a new ice binder for the woven-glass fibre.