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Description
Ultrashort, intense terahertz radiation sources hold tremendous potential for various industrial and scientific applications. However, the bandwidth of FEL based pulses is limited due to slippage effects in the undulator. In this paper we study a solution to generate very short and intense THz pulses using chirped microbunching combined with tapered undulators in order to effectively compress the radiation pulse length. Tunable chirped microbunching can be generated in a compact setup using a properly shaped mask at a high dispersion plane in the electron beam transport prior injection into a tapered undulator. With the help of numerical simulation, we study the radiation pulse length and peak power scaling of this scheme showcasing its ability to produce few-cycle pulses with high peak power at 10THz.
