1. A high-DC-voltage GaAs photoemission gun: Transverse emittance and momentum spread measurements
- Author
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D. Kehne, Courtlandt L. Bohn, Bruce Dunham, H. Liu, Charles Sinclair, R. Legg, L. Cardman, D. Engwall, and M. Shinn
- Subjects
Physics ,business.industry ,Computer Science::Software Engineering ,Particle accelerator ,Electron ,Laser ,Photocathode ,law.invention ,Nonlinear Sciences::Adaptation and Self-Organizing Systems ,Optics ,Beamline ,law ,Physics::Accelerator Physics ,Thermal emittance ,Atomic physics ,Beam emittance ,business ,Electron gun - Abstract
We have built a high-DC-voltage photoemission gun and a diagnostic beamline permitting us to measure rms transverse emittance (/spl epsi//spl tilde//sub x/) and rms momentum spread (/spl 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 500 kV. We have measured /spl epsi//spl tilde//sub x/ and /spl 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.
- Published
- 2002
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