Copper Solenoid Design for the Continuous Operation of a Second Harmonic 95-GHz Gyrotron

A copper solenoid for the continuous operation of a second harmonic 95-GHz gyrotron is presently under development at Ariel University. The solenoid will provide a magnetic field of 1.8 T in the interaction region. The solenoid has six concentric cylindrical segments of copper foil windings and two correction segments. The segments are each separated by a gap of 5 mm in which water is pumped for cooling. A simulation predicts magnetic field homogeneity of ±0.34%over a length of 40 mm. The parameters of the design together with simulation results of the magnetic field, electron trajectories, and thermal analyses are presented.