Analytical Modeling of Electron Back-Bombardment Induced Current Increase in Un-Gated Thermionic Cathode Rf Guns

Conference · Sun Jan 01 00:00:00 EST 2017

DOI:https://doi.org/10.18429/JACoW-NAPAC2016-WEPOB25· OSTI ID:1491097

Edelen, J. P.; Sun, Y.; Harris, J. R.; Lewellen, J. W.

In this paper we derive analytical expressions for the output current of an un-gated thermionic cathode RF gun in the presence of back-bombardment heating. We provide a brief overview of back-bombardment theory and discuss comparisons between the analytical back-bombardment predictions and simulation models. We then derive an expression for the output current as a function of the RF repetition rate and discuss relationships between back-bombardment, field-enhancement, and output current. We discuss in detail the relevant approximations and then provide predictions about how the output current should vary as a function of repetition rate for some given system configurations.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: Argonne National Laboratory - Advanced Photon Source
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1491097
• Resource Relation: Conference: 2016 North American Particle Accelerator Conference, 10/09/16 - 10/14/16, Chicago, IL, US
• Country of Publication: United States
• Language: English

Related Subjects

BACK-BOMBARDMENT
RF GUNS
UN-GATEDTHERMIONIC