Maximum achievable beam brightness from photoinjectors

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 brightne...

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Bibliographic Details
Published in:Physical review letters 2009-03, Vol.102 (10), p.104801-104801
Main Authors: Bazarov, Ivan V, Dunham, Bruce M, Sinclair, Charles K
Format: Article
Language:English
Subjects:
ACCELERATORS
BEAM LUMINOSITY
ELECTRIC POTENTIAL
ELECTRON BEAMS
ELECTRON GUNS
OPTIMIZATION
PARTICLE ACCELERATORS
PHASE SPACE
PHOTOCATHODES
PHOTOEMISSION
RELATIVISTIC RANGE
SPACE CHARGE
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.102.104801