Thermionic electron gun design and prototyping

Cid Thermionic Gun System*

A new high-current thermionic gun has been installed on the CID injector at SLAC and brought into operation. The gun and pulser system generate three nanosecond pulses of about six amps peak which, when bunched in the subharmonic buncher system, produce in excess of 1011 electrons in a single S-band accelerated bunch. Preliminary operation of the gun is described, and details of the avalanche c...

Communication: Effects of thermionic-gun parameters on operating modes in ultrafast electron microscopy

Ultrafast electron microscopes with thermionic guns and LaB6 sources can be operated in both the nanosecond, single-shot and femtosecond, single-electron modes. This has been demonstrated with conventional Wehnelt electrodes and absent any applied bias. Here, by conducting simulations using the General Particle Tracer code, we define the electron-gun parameter space within which various modes m...

Low Emittance Thermionic Electron Guns*

Electron Gun Technology

Design and Operation of Pegasus Thermionic Cathode

A new thermionic cathode has been developed and installed for use on the PEGASUS plane wave transformer injector. The novel design of the LaB6 cathode allows for thermionic emission as well as photoinjector operation. Both test-stand measurements and in situ operational experience are reported.