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- W2946100892 abstract "Electron injectors are at the basis of Free-Electron Lasers and Inverse Compton Light Sources. Developing the next-generation injector will allow these accelerator-based light sources to meet the growing science demand for an increase in average brightness. The concept described in this paper combines the reliability and high current density of thermionic cathodes with the beam manipulation capabilities of microwave cavities. This produces a low emittance, high repetition rate electron beam in a compact setup. A custom design 100 kV thermionic gun provides a continuous electron beam, with the current determined by the filament size and temperature. A 1 GHz rectangular cavity deflects the beam across a knife-edge, creating a pulsed beam with a core emittance growth of 5 nm rad. Adding a higher harmonic mode to this cavity results in a flattened magnetic field profile which increases the duty cycle to 30%. Finally, a compression cavity induces a negative longitudinal velocity-time chirp in a bunch, initiating ballistic compression. Adding a higher harmonic mode to this cavity increases the linearity of this chirp and thus decreases the final bunch length before injection into an RF accelerator. Charged particle simulations show that with a 0.15 mm radius LaB6 filament this method can create 280 fs, 3.1 pC electron bunches with a transverse rms core emittance of 0.12 mm mrad at a repetition rate of 1 GHz." @default.
- W2946100892 created "2019-05-29" @default.
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- W2946100892 date "2019-05-22" @default.
- W2946100892 modified "2023-09-27" @default.
- W2946100892 title "High repetition rate thermionic electron injector concept using higher harmonic cavities" @default.
- W2946100892 hasPublicationYear "2019" @default.
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