Title :
Field emitted electron trajectories for the CEBAF cavity
Author :
Yunn, Byung C. ; Sundelin, Ronald M.
Author_Institution :
Continuous Electron Beam Accel. Facility, Newport News, VA, USA
Abstract :
Electromagnetic fields of the superconducting 5-cell CEBAF cavity with its fundamental power coupler are solved numerically with URMEL and MAFIA codes. Trajectories of field emitted electrons following the Fowler-Nordheim relation are studied with a numerical program which accepts the URMEL/MAFIA fields. Emission sites and gradients are determined for those electrons which can reach the cold ceramic window either directly or by an energetic back-scattering. The peak and average impact energy and current are found. The generation of dark current by field emitted electrons has also been studied, and its relevance to CEBAF operation is briefly discussed
Keywords :
beam handling equipment; cavity resonators; electron accelerators; linear accelerators; physics computing; CEBAF cavity; Fowler-Nordheim relation; MAFIA code; URMEL code; average impact energy; cold ceramic window; dark current; electromagnetic fields; emission sites; energetic back-scattering; field emitted electron trajectories; fundamental power coupler; gradients; superconducting 5-cell CEBAF cavity; Binary search trees; Ceramics; Electromagnetic coupling; Electromagnetic fields; Electromagnetic waveguides; Electron accelerators; Electron beams; Electron emission; Flexible printed circuits; Trajectory;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.308673
