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SUMMARY:Toward a multipactor free cavity design for a very high frequency 
 continuous wave electron gun
DTSTART:20260810T140000Z
DTEND:20260810T150000Z
DTSTAMP:20260727T170800Z
UID:indico-event-19105@indico.psi.ch
DESCRIPTION:Speakers: Yitong Duan (Tsinghua University\, Beijing\, China)\
 n\nA very‑high‑frequency (VHF) photocathode electron gun serves as an 
 electron source capable of generating high‑repetition‑rate\, high‑br
 ightness electron bunches. It operates in continuous‑wave (CW) mode with
  a 100% microwave duty cycle\, a configuration where multipactor emerges a
 s a critical operational challenge requiring meticulous mitigation. The ex
 ponential amplification of secondary electrons within the electron gun may
  cause power dissipation\, cavity material degradation\, and beam quality 
 deterioration\, ultimately compromising the performance and operational li
 fetime of the VHF gun. The analysis of electron trajectories inside the ca
 vity reveals that the energy dispersion and angular distribution of emitte
 d electrons significantly affect their subsequent motion. Although the mul
 tipactor behavior is nonresonant\, multiple resonance modes can still be i
 dentified from the statistical distribution of particle flight times. This
  study examines the influence of radio frequency (RF) cavity geometry on m
 ultipactor behavior\, with the underlying mechanisms elucidated through st
 atistical analysis of particle trajectories. The effect of the secondary e
 lectron yield of copper on multipactor is also discussed. Finally\, an opt
 imized RF cavity profile exhibiting very low multipactor intensity is pres
 ented\, providing a promising approach to achieving stable VHF electron gu
 n operation.\nContact: Thomas Lucas\n\nhttps://indico.psi.ch/event/19105/
URL:https://indico.psi.ch/event/19105/
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