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This paper presents expected THz radiation spectra emitted by micro-bunchedelectron beams produced using a slit-mask placed within a magnetic chicane inthe FAST (Fermilab Accelerator Science and Technology) electron injector atFermilab. Our purpose is to generate tunable narrow-band THz radiation with asimple scheme in a conventional photo-injector. Using the slit-mask in thechicane, we create a longitudinally micro-bunched beam after the chicane bytransversely slicing an energy chirped electron bunch at a location withhorizontal dispersion. In this paper, we discuss the theory related to themicro-bunched beam structure, the beam optics, the simulation results of themicro-bunched beam and the bunching factors. Energy radiated at THz frequenciesfrom two sources: coherent transition radiation and from a wiggler iscalculated and compared. We also discuss the results of a simple method toobserve the micro-bunching on a transverse screen monitor using a skewquadrupole placed in the chicane.

Micro-bunching for generating tunable narrow-band THz radiation at the FAST photoinjector