Micro-bunching for generating tunable narrow-band THz radiation at the FAST photoinjector
arXiv:1808.07846 · doi:10.1016/j.nima.2018.10.219
Abstract
This paper presents expected THz radiation spectra emitted by micro-bunched electron beams produced using a slit-mask placed within a magnetic chicane in the FAST (Fermilab Accelerator Science and Technology) electron injector at Fermilab. Our purpose is to generate tunable narrow-band THz radiation with a simple scheme in a conventional photo-injector. Using the slit-mask in the chicane, we create a longitudinally micro-bunched beam after the chicane by transversely slicing an energy chirped electron bunch at a location with horizontal dispersion. In this paper, we discuss the theory related to the micro-bunched beam structure, the beam optics, the simulation results of the micro-bunched beam and the bunching factors. Energy radiated at THz frequencies from two sources: coherent transition radiation and from a wiggler is calculated and compared. We also discuss the results of a simple method to observe the micro-bunching on a transverse screen monitor using a skew quadrupole placed in the chicane.
arXiv comment25 pages, 8 figures
References in corpus (5)
- IOTA (Integrable Optics Test Accelerator): Facility and Experimental Beam Physics Program
- Generation of High-Power, Tunable Terahertz Radiation from Laser Interaction with a Relativistic Electron Beam
- Using the longitudinal space charge instability for generation of VUV and X-ray radiation
- Observation of Coherently-Enhanced Tunable Narrow-Band Terahertz Transition Radiation from a Relativistic Sub-Picosecond Electron Bunch Train
- THz-radiation production using dispersively-selected flat electron bunches