Profile of a circuit wall in a 170 GHz gyrotron operating in the TE32,09-mode.
Profiles of magnetic fields in cryomagnets of “Oxford Instruments” (OI) and “Ansaldo” (ASG).
The function for the ITER gyrotron in the case of ideal symmetry (a) and parallel displacement of the beam axis by 1.5 mm (b). In (b), the profiles of are shown for the ASG cryomagnet and three values of the angle : 0°, 60°, and 120°; the curves for two of them practically coincide. (The same dependencies take place for angles equal to 180°, 240°, and 300°, respectively.)
Functions for the case, when not only shift but also tilt is present: (a) the tilt angle is equal to 0.5°, (b) the tilt angle is 1°. In both cases, the shift is 0.25 mm and the magnetic field profile corresponds to that of the ASG cryomagnet.
Efficiency as a function of transverse coordinates in the cases of (a) parallel displacement, (b) a tilt angle 0.5°, and (c) a tilt angle 1°.
Efficiency as a function of the tilt angle. The solid line corresponds to the case of a beam centered at the entrance , and the dashed line corresponds to the shift optimized for each tilt angle value.
Efficiency and mode amplitudes as functions of the tilt angle. Here, and .
Efficiency and mode amplitudes as functions of the displacement. Here, and .
Temporal dependence of phase, efficiency, and mode amplitudes at and .
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