A high-DC-voltage GaAs photoemission gun: Transverse emittance and momentum spread measurements

Conference · Sun Jun 01 00:00:00 EDT 1997

OSTI ID:489620

Engwall, D; Bohn, C; Cardman, L ^[1]

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1. Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); and others

We have built a high-DC-voltage photoemission gun and a diagnostic beamline permitting us to measure rms transverse emittance ({epsilon}{sub x}) and rms momentum spread ({delta}) of short-duration electron pulses produced by illuminating the cathode with light from a mode-locked, frequency-doubled Nd:YLF laser. The electron gun is a GaAs photocathode source designed to operate at 500kV. We have measured {epsilon}{sub x} and {delta} for conditions ranging from emittance-dominated to space-charge-dominated. We report these measurements as functions of microbunch charge for different beam radii, pulse lengths, and voltages/field gradients at the cathode, and compare them with PARMELA calculations.

• Research Organization: Southeastern Universities Research Association, Inc., Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 489620
• Report Number(s): DOE/ER/40150-1121; JLAB-ACC-97-16; CONF-970503-13; ON: DE97006532; TRN: 97:012591
• Resource Relation: Conference: 17. IEEE particle accelerator conference, Vancouver (Canada), 12-16 May 1997; Other Information: PBD: 1997
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
36 MATERIALS SCIENCE
GALLIUM ARSENIDES
PHOTOEMISSION
ELECTRON GUNS
DESIGN
BEAM EMITTANCE
PHOTOCATHODES
ELECTRON BEAMS