Feasibility of obtaining short electron-beam pulses from a Van de Graaff 3-MV accelerator using laser-photoelectron emission from a cold trioxide cathode

Journal Article · Mon Sep 01 00:00:00 EDT 1986 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1138688· OSTI ID:5491563

Luthjens, L H; Hom, M L; Vermeulen, M J.W.

Production of electron-beam pulses with a 700-ps FWHM duration, using laser-photoelectron emission from a cold trioxide cathode in a 3-MV Van de Graaff accelerator has been demonstrated. At 70-kW laser power (lambda = 337.2 nm) a current of about 1 mA has been measured which means a cathode quantum efficiency of 10/sup -7/. An electron transit time jitter of about 40 ps has been measured, to be attributed to voltage fluctuations on the accelerator tube electrodes resulting from the charging belt system. The results are discussed with respect to the feasibility to produce short pulses with a 1-nC total charge, taking into account the quantum efficiency of 10/sup -4/ measured in a test setup for the cold trioxide cathode. Larger quantum efficiency for the accelerator cathode and decrease of the transit time jitter are the main goals set for development of the Van de Graaff accelerator as a radiation source for very high time-resolution experiments in radiation chemistry and physics.

• Research Organization: Interuniversitair Reactor Instituut, Mekelweg 15, 2629 JB Delft, The Netherlands
• OSTI ID: 5491563
• Journal Information: Rev. Sci. Instrum.; (United States), Vol. 57:9
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CATHODES
PHOTOEMISSION
ELECTRON BEAMS
BEAM PRODUCTION
BEAM PULSERS
PULSE TECHNIQUES
VAN DE GRAAFF ACCELERATORS
ELECTRON SOURCES
QUANTUM EFFICIENCY
ACCELERATORS
BEAMS
EFFICIENCY
ELECTRODES
ELECTROSTATIC ACCELERATORS
EMISSION
LEPTON BEAMS
PARTICLE BEAMS
PARTICLE SOURCES
RADIATION SOURCES
SECONDARY EMISSION
640301* - Atomic
Molecular & Chemical Physics- Beams & their Reactions