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

fYear

1993

fDate

17-20 May 1993

Firstpage

1092

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.308673

Filename

308673