Speaker
Description
Field emission, enabled by quantum tunneling, offers distinct advantages over conventional thermionic emission and photoemission, including high brightness, low emittance, rapid response, and room-temperature operation without external heating. These characteristics make it highly promising for compact accelerators; however, challenges in beam quality control and cathode longevity remain to be addressed. To tackle these issues, a 9.3 GHz electron gun with an exchangeable cathode has been designed. The 4.2-cell structure features a TM₀₂-mode first cell. Electromagnetic and beam dynamics simulations have confirmed its capability to generate a 2 MeV beam at 80 MV/m. The compact design and sufficient beam energy suit the gun for industrial and medical applications such as fine-focus non-destructive testing. Furthermore, the exchangeable cathode facilitates systematic investigation into the influence of cathode materials and geometry on the field enhancement factor. This work represents a significant step toward the development of practical, high-brightness, low-emittance field-emission RF guns.
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