Magnetic Field Source for Bi-Chambered Electron Beam Devices
ARMY RESEARCH LAB FORT MONMOUTH NJ
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Certain gyro-type electron beam devices require two tandem coaxial chambers with different uniform axial magnetic fields in their interiors. Therefore, there is a step in the field profile in the vicinity of the junction of the two chambers, which are sometimes of different diameter as well. Ah electric solenoid is usually employed to furnish such a field but the sources are bulky, cumbersome, and consumptive of energy, and provide only rough approximations to the ideal field profile. This report describes a permanent magnet field source that was designed to provide a constant axial field of 2 kOe in the larger of the two chambers and 0.5 kOe in the smaller. The basic field is provided by two tandem permanent magnet solenoids. The rather broad transition between the field values in the two chambers is considerably narrowed approximately 50 percent by the placement of a radially magnetized ring internal to the junction of the two solenoids. The field profile can be made to conform to that specified to within a few percent by addition of two axially magnetized rings.
- Electrical and Electronic Equipment
- Electricity and Magnetism