We discuss simulations and experiments on creating micro-bunch beams for generating narrow band THz radiation at the Fermilab Accelerator Science and Technology (FAST) facility. The low-energy electron beamline at FAST consists of a photoinjector-based RF gun, two L-band superconducting accelerating cavities, a chicane, and a beam dump. The electron bunches are lengthened with cavity phases set off-crest for better longitudinal separation and then micro-bunched with a slit-mask installed in the chicane. We carried out the experiments with 30 MeV electron beams and detected signals of the micro-bunching using a skew quadrupole magnet in the chicane. In this paper, the details of micro-bunch beam production, the detection of micro-bunching and comparison with simulations are described.
@article{arxiv.1807.04312,
title = {Micro-Bunched Beam Production at FAST for Narrow Band THz Generation Using a Slit-Mask},
author = {J. Hyun and D. Crawford and D. Edstrom and J. Ruan and J. Santucci and R. Thurman-Keup and T. Sen and J. C. Thangaraj},
journal= {arXiv preprint arXiv:1807.04312},
year = {2018}
}