Maximum Achievable Beam Brightness from Photoinjectors

Journal Article · Fri Mar 13 04:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.104801· OSTI ID:21180285

Bazarov, Ivan V; Dunham, Bruce M; Sinclair, Charles K ^[1]

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1. Laboratory for Elementary Particle Physics, Cornell University, Ithaca, New York 14853 (United States)

Electron injectors delivering relativistic electron beams with very high brightness are essential for a number of current and proposed electron accelerator applications. These high brightness beams are generally produced from photoemission cathodes. We formulate a limit on the electron beam brightness from such cathodes set by the transverse thermal energy of the electrons leaving the photocathode and the accelerating field at the cathode. Two specific examples--direct measurement of the transverse phase space of a space charge dominated beam from a high-voltage photoemission electron gun and a numerical optimization of the same at a higher gun voltage--illustrate the importance of this limit.

• OSTI ID: 21180285
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
BEAM LUMINOSITY
ELECTRIC POTENTIAL
ELECTRON BEAMS
ELECTRON GUNS
OPTIMIZATION
PHASE SPACE
PHOTOCATHODES
PHOTOEMISSION
RELATIVISTIC RANGE
SPACE CHARGE