Beam dynamic analysis of RF modulated electron beam produced by gridded thermionic guns

G. Adam, L. Zhang, A. W. Cross, B. Militsyn

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A thermionic cathode gridded electron gun used in injectors for different types of circular and linear particle accelerators and for energy recovery configurations was studied. Both theory and numerical simulation were used to explore the relationship between the bunch charge and bunch length. The electron gun is based on a Pierce-type geometry. It was initially designed using Vaughan synthesis followed by optimization using a 2D electron trajectory solver TRAK. After optimization, the grid in front of the cathode was inserted and the RF field was introduced through a coaxial waveguide structure. The complete gun was simulated using the PIC code MAGIC. High duty cycle operations at frequencies 1.5 GHz and 3.0 GHz, were investigated using different combinations of both the bias and the RF voltage applied between the cathode and the grid. The beam dynamics results from the PIC showed that a minimum bunch length of 106 ps could be achieved with a bunch charge of 33 pC when the driving RF frequency was 1.5 GHz. Operating at the higher RF frequency of 3GHz did not significantly reduce the bunch length. The normalized emittance of about 5.6 mm-mrad was demonstrated in PIC simulations.
Original languageEnglish
Title of host publication12th International Particle Accelerator Conference
EditorsLiu Lin, Regis Neuenschwander, Renan Picoreti, Volker R. W. Schaa
Place of PublicationGeneva, Switzerland
Number of pages4
ISBN (Electronic)9783954502141
Publication statusPublished - 30 Aug 2021
EventThe 12th International Particle Accelerator Conference: IPAC 21 - Virtual, Campinas, Brazil
Duration: 24 May 202128 May 2021

Publication series

NameInternational Particle Accelerator Conference
PublisherJACoW Publishing
ISSN (Electronic)2673-5490


ConferenceThe 12th International Particle Accelerator Conference
Internet address


  • beam dynamic analysis
  • RF modulated electron beam
  • gridded thermionic guns


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