Abstract
A permanent-magnet structure (twister) has been designed and built to replace the bifilar electrical coil presently used in a helical free-electron laser microwave source (ubitron). The magnet elements are thin rectangular slabs perforated by circular holes at their centers and magnetized in the direction of their long axes. Each magnet is embedded in a brass disk for protection and support. Holes drilled near the peripheries of the disks serve to position the magnets for the desired twist rates. The structure provides transverse helical fields of 1.15 and 2.30 kOe for twist periods of 2.5 and 5.0 cm, respectively. These values are double those presently generated by a much bulkier coil with considerable expenditure of electrical energy. The massive power supply is also eliminated by the permanent-magnet structures. Since the power output of ubitrons varies with the mean square of the transverse field, power output of the permanent-magnet twister should be four times that provided with the bifilar coil. The device is intended to be a radiation source/amplifier in the 10-GHz region.
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