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Description
Microbunching of a long electron beam via interaction with a 1 THz plasma is investigated as a mechanism for generating coherent terahertz (THz) radiation. This work presents a theoretical design study for the Pohang Accelerator Laboratory (PAL) e-labs beamline, evaluating dependence of initial electron beam parameters on microbunch formation following plasma interaction.
The initial electron beam parameters under consideration: emittance, energy, charge, and RMS beam radius, are varied within the operational constraints of PAL e-labs beamline, building on an existing beamline proposal originally intended for studies of long-beam instabilities and extended here towards THz source applications. The sensitivity of microbunch formation and radiation output to these initial parameters is analysed.
Radiation output is estimated using a simplified scheme comprised of a collimator and dipole magnet. Optimisation of the beam parameters within the available constraints is shown to more than double the predicted yield of THz radiation relative to the baseline configuration.
These results indicate that plasma-induced microbunching in long electron beams offers a viable route towards compact THz source development at operating accelerator facilities, with performance dependent on achievable beam quality and transport parameters.