Speaker
Description
We report on the development of a sheet-beam electron source for terahertz Smith–Purcell radiation experiments. A photoemission-based electron gun driven by a femtosecond Ti:sapphire laser produces an elliptical beam of approximately 0.1 mm × 8 mm at 5 keV.
To control beam divergence along the short axis, a focusing electrode was introduced. Beam profiles were measured using a microchannel plate with a phosphor screen and a wire grid monitor.
The results show that increasing the focusing voltage improves beam confinement, consistent with simulations. The wire grid measurements agree with MCP observations.
These results demonstrate the feasibility of generating a controlled sheet beam suitable for Smith–Purcell radiation experiments. Further studies are underway to explore alternative photoemission approaches, including edge-enhanced photoemission geometries and magnetic focusing schemes.
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