International Conference on Ion Sources (ICIS2021)

Simulations for a High-Current Electron Gun for the EBIT Charge Breeder of the ReA Post-Accelerator at FRIB

Not scheduled

20m

Poster Production of highly charged ion beams Poster Session 2

Speaker

Dr Hyock-Jun Son (Facility for Rare Isotope Beams, National Superconducting Cyclotron Laboratory, Michigan State University)

Description

The Facility for Rare Isotope Beams (FRIB) at Michigan State University is nearing completion. In some cases, the RIB rates at FRIB are expected to exceed 10$^{10}$ particles/s. The ReA EBIT charge breeder operates with an electron-beam current of 300 – 600 mA for a density of 170 – 340 A/cm$^2$. This current corresponds to a maximum capacity of 10$^{10}$ elementary charges, which can be insufficient to handle high FRIB rates. To increase the EBIT electron-beam current and density, electron-beam simulations have been performed for a new electron-gun insert with a dispenser cathode having a larger emitting area. An electron beam of 2 A was the target current to reach a capacity of 5×10$^{10}$ elementary charges. Parameter studies have been conducted to optimize beam transmission. A simulated current density at the trap was obtained to be 432 A/cm$^2$. The basic design of the insert and result of the simulations for the ReA EBIT will be presented.

Presentation materials

ID 9 - ReA EBIT egun simulation.pdf

ID 9 - ReA EBIT egun simulation.png