Experimental Study on Performance of Slow Cyclotron Maser in Weakly Relativistic Region

摘要

Studies of slow cyclotron maser operation of slow–wave device are reported. The beam voltage is weakly relativistic, less than 100 kV. The slow-wave structure is periodically corrugated oversized waveguide, whose target operation frequency due to the Cherenkov interaction is in K-band. By using rectangular corrugation having the relatively small ratio of corrugation width to periodic length of about 20%, the dispersion curve around the upper cut-off becomes flat and the effect of second harmonic slow cyclotron resonance is observed in the low energy region near 30kV. By using the sinusoidal corrugation and the rectangular corrugation having the ratio of corrugation width to periodic length of 50%, the effect of the fundamental and the second harmonic slow cyclotron maser is observed in the low energy region