High brightness electrostatically focused field emission electron gun for free electron laser applications

Journal Article · Sat Jun 01 00:00:00 EDT 1985 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.335276· OSTI ID:5940602

Kirkpatrick, D A; Shefer, R E; Bekefi, G

An electrostatically focused, multistage electron gun using a cold (field emission) cathode has been developed for use in a free electron laser. This gun produces a 1.1-kA, 2.0-MV electron beam with a normalized emittance epsilon/sub n/approx. =38 x 10/sup -3/ (..pi.. cm rad), and a brightness of 74 kA/cm/sup 2/ rad/sup 2/. The measured brightness is almost two orders of magnitude higher than that found in most RF linacs using conventional thermionic cathodes, and is comparable to that achieved using electron guns immersed in strong guiding magnetic fields. The emittance and brightness have been studied as a function of cathode material, surface finish, and the electric field strength at the cathode surface.

• Research Organization: Department of Physics and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge Massachusetts 02139
• OSTI ID: 5940602
• Journal Information: J. Appl. Phys.; (United States), Vol. 57:11
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
42 ENGINEERING
ELECTRON GUNS
OPERATION
PERFORMANCE
FREE ELECTRON LASERS
BEAM EMITTANCE
BRIGHTNESS
CATHODES
DESIGN
ELECTRON BEAMS
ELECTROSTATICS
EXPERIMENTAL DATA
FABRICATION
FOCUSING
MEV RANGE 01-10
BEAMS
DATA
ELECTRODES
ENERGY RANGE
INFORMATION
LASERS
LEPTON BEAMS
MEV RANGE
NUMERICAL DATA
OPTICAL PROPERTIES
PARTICLE BEAMS
PHYSICAL PROPERTIES
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