Gigahertz repetition rate thermionic electron gun concept

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
114 Downloads (Pure)


We present a novel concept for the generation of gigahertz repetition rate high brightness electron bunches. 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 rf cavity deflects the beam across a knife-edge, creating a pulsed beam. 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. Charged particle simulations show that with a 0.15 mm radius LaB6 filament held at 1760 K, this method can create 279 fs, 3.0 pC electron bunches with a radial rms core emittance of 0.089 mm mrad at a repetition rate of 1 GHz.

Original languageEnglish
Article number123401
Number of pages12
JournalPhysical Review Accelerators and Beams
Issue number12
Publication statusPublished - 11 Dec 2019


Dive into the research topics of 'Gigahertz repetition rate thermionic electron gun concept'. Together they form a unique fingerprint.

Cite this