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...

Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power rf sources. We are also constructing the Compact ERL (cERL) fo...

Initial operation of a 17 GHz RF photocathode electron gun has been achieved at MIT. This is the first photocathode electron gun to operate at a frequency above 2.856 GHz. Such electron guns have the potential for achieving record high values of electron beam quality. The 1.5 cell, p-mode, copper cavity was tested with 5-10 MW, 100 ns, 17.145 GHz pulses from a klystron amplifier built by Haimso...

We report the first operation of a 17 GHz RF photocathode electron gun. This is the first photocathode electron gun to operate at a frequency above 2.856 GHz. Such electron guns have the potential for achieving record high values of electron beam quality. The 1 2 cell, π -mode, copper cavity was tested with 5-10 MW, 100 ns, 17.145 GHz pulses from a 24 MW Haimson Research Corp. klystron amplifie...

Over the years, generation and acceleration of ultra-short, high quality electron beams has attracted more interest in accelerator science. Electron bunches with these properties are necessary to operate test novel diagnostics advanced high-gradient accelerating schemes, such as plasma accelerators dielectric laser accelerators. Furthermore, several medical industrial applications require high-...

An apparatus has been developed for electron-atom Compton scattering experiments that can employ a pulsed laser and picosecond electron beam in pump-and-probe scheme. The design technical details of the are described. Furthermore, experimental results on Xe atom its ground state presented to illustrate performance gun detection spectrometric capabilities scattered electrons. scope future applic...

We propose a versatile THz source named FLUTE (Ferninfrarot LinacUnd Test-Experiment) based on a 30 50 MeV S-band linac with bunch compressor, that aims at not only producing high field THz pulses but also at serving as a test facility to study accelerator physics issues. This source is an important step towards the planned ultra-broadband THz to mid infrared user facility TBONE. Special emphas...