Test of a High-gradient Low-emittance Electron Gun

A High Current, High Gradient, Laser Excited, Pulsed Electron Gun

This paper describes a pulsed electron gun that can be used as an FEL, as an injector for electron linear accelerators or for rf power generation. It comprises a 1 to 5 MeV, 1 to 2 ns pulsed power supply feeding a single diode, photoexcited acceleration gap. Beam quality of a ~ 1nC charge in ~ 1 GV/m field was studied. Computations of the beam parameters as a function of electrode configuration...

Generation of amplified picosecond square pulses for low emittance electron generation in photocathode RF-GUN

Amplified square shaped picosecond pulses was generated for low emittance electron beam generation in a photocathode RF-GUN. Square shaped pulses were generated by using Ti:sapphire amplifier system in inrfared region and then converted to ultraviolet region via third harmonics generation. Generated squares shaped pulses were measeured by crosscorrelation and spectral interferometric technique ...

Low Emittance Thermionic Electron Guns*

Emittance correction of photocathode gun

The standard emittance calculation removes linear correlations between transverse displacement r and the divergence r' Higher order correlations remain and they are responsible for a substantial area m phase space which corresponds to the calculated emittance. Time-dependent correlations are identified and different procedures (transverse and longitudinal laser shaping, rf quadrupole) are propo...

Slice Emittance Measurements at the SLAC Gun Test Facility*

A goal of the Gun Test Facility (GTF) at SLAC is to investigate the production of highbrightness electron beams for the Linac Coherent Light Source (LCLS) X-ray FEL. High brightness in the rf photocathode gun occurs when the time-sliced emittance is nearly the same as the cathode thermal emittance and when the slices are all lined up, i.e., their Twiss parameters are nearly identical. In collab...