Resonator design studies for a 150 GHz gyrotron at Kf K

Effect of Resonator Parameters on Frequency and Quality Factor of Gyrotron Resonators

“…The frequency is quite insensitive to the rounding length; the table gives the value for D 2 = 6 mm, but the frequency was never more than 2 MHz lower for the other values considered (see Tables 2, 3, and 4). The effect of varying the length of the cavity mid-section confirms much earlier results ( [11][12][13], among others); these were also confirmed in [5]. To be able to compare the results calculated with field profiles with those calculated for a Gaussian field profile of the form…”

“…As a result of the nonfixed character of the RF field structure, the self-consistent fields contain some admixture of these modes. Also, such oscillations can be expected to be more of a problem if the cavity midsection is slightly tapered, since then the difference in frequency and quality factor for modes with axial index 1 and 2 is smaller (see [12,13]). The subject was discussed in some detail by Moiseev et al [8], and was determined not to be a serious problem.…”