ANALYTICAL MODELING OF ELECTRON BACK-BOMBARDMENT INDUCED CURRENT INCREASE IN UN-GATED THERMIONIC CATHODE RF GUNS

Conference · Wed Sep 28 00:00:00 EDT 2016

OSTI ID:1329666

Edelen, J. P. ^[1]; Sun, Y. ^[2]; Harris, J. R. ^[3]; Lewellen, J. W. ^[4]

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1. Fermilab
2. Argonne
3. AFRL, NM
4. Los Alamos Natl. Lab.

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, fieldenhancement, 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); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1329666
• Report Number(s): FERMILAB-CONF-16-415-AD; 1492689
• Resource Relation: Conference: 2nd North American Particle Accelerator Conference, Chicago, Illinois, USA, 10/09-10/14/2016
• Country of Publication: United States
• Language: English