Relativistic gyrotrons and cyclotron autoresonance masers

The CARM beam-wave interaction and cavity design

“…The solution for the point a), widely discussed in ref. [7], is given by adjusting the design parameters in such a way that the starting current [4] of the near cutoff mode (intersection point a in Fig. 1) is greatly enhanced with respect to the CARM interaction.…”

“…In parallel to the development of the full numerical analysis, we have undertaken the cavity design by the use of "home-made" 1D/3D code, based on the selfconsistent procedure discussed by several authors [3][4][5] and on the "universal" scaling formulae that describe the CARM performances including inhomogeneous broadening effects and the beam current, as it happens in the case of Undulator FEL [6]. An effective analysis tool in term of analytical formulae and computer simulation has been accordingly obtained.…”

Linear and nonlinear theory of cyclotron autoresonance masers with multiple waveguide modes

“…Another interesting feature of the multimode CARM interaction is that the saturated rf power of each mode is insensitive to input rf power distribution among the coupled modes at z = 0. Figure 11 shows the results of simulations for the coupled TE 11 and TE 12 modes with two different distributions of input rf power. In Fig.…”

“…12, for the coupled TE 11 and TE 12 modes, with the same system parameters used in Figs. 9(b) and 10(b), except that w varies from 3wii to 9w,11.…”

“…13 and 14, where we plot the dependence of rf power and relative rf phase on the interaction length z for a CARM with the TE 11 and .33, and 6.98 kG, respectively. The fractional rf power for a given mode at sat-uration reaches a maximum at its resonant magnetic field, and then decreases rapidly off resonance.…”