Abstract
Ultrashort pulse generation based on two coupled helical gyro-TWTs
Highlights
Q2A m2A Q2B mB2 is the wave coupling parameter [3] proportional to the corrugation depth r, r0 is the mean radius of a corrugated waveguide, NA and NB are the dimensionless norms of the partial waves, Vgr h0c NA is the group velocity of the traveling wave B, V||0 E||0c is the longitudinal velocity of electrons, Ib is the beam current
We assume that the amplifying and absorbing sections are coupled via the traveling partial wave B In accordance with the scheme shown in Fig. 1 boundary conditions can be presented in the form b2 t,l1 b1 t,l1, b1 t,0 Rb2 t T,l1 l2 (2) where R < 1 is the reflection coefficient
Simulations were performed for parameters the experimentally realized Ka-band helical gyro-TWT [4]: the particles energy of 50–70 keV, the total current of 2–10 А, the pitch-factor of 0.8–1.2
Summary
Multi-fold helical corrugation provides the coupling of two partial TEm,n modes: a near-cutoff mode A and a far-from-cutoff traveling mode B. Q2A m2A Q2B mB2 is the wave coupling parameter [3] proportional to the corrugation depth r , r0 is the mean radius of a corrugated waveguide, NA and NB are the dimensionless norms of the partial waves, Vgr h0c NA is the group velocity of the traveling wave B, V||0 E||0c is the longitudinal velocity of electrons, Ib is the beam current,
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