Speaker
Description
Here we present an analytical model theory for time domain analysis and design of Tapering Enhanced Superradiant (TES) FEL at zero-slippage condition. The model is implemented for optimization of an ongoing experimental project of a THz radiation source based on the 6 MeV ORGAD RF-Accelerator at Ariel University.
The design of the setup is based on a twenty-period planar undulator made of five-period uniform part and a fifteen-period amplitude tapered part. The radiation is guided in a rectangular waveguide, where due to the dispersion of the waveguide mode it is possible to operate at zero-slippage condition, namely, the group velocity of the mode at the phase synchronism frequency is equal to the axial velocity of the electron bunch. Since the bunch duration is much shorter than the radiation period, its spontaneous emission is superradiant (emits in proportion to the number of electrons squared). At the end of the uniform undulator, the bunch gets trapped by its own emitted radiation, and due to the tapering in the second undulator section it extracts additional radiative energy from the beam, which continues to stay trapped at the zero-slippage condition.
Funding Agency
ISF- Israeli Science Foundation
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