Microbunched electron cooling with amplification cascades

Coherent transition radiation from a helically microbunched electron beam

The coherent transition radiation emitted from an electron beam with higher-order spatial microbunching is analyzed. The characteristic angular and phase dependence can be used to identify the dominant bunching structure of such beams, which can be generated during the harmonic interaction in optical klystron modulators and free-electron lasers, and used as tunable sources of coherent light wit...

Single-shot coherent diffraction imaging of microbunched relativistic electron beams for free-electron laser applications.

With the advent of coherent x rays provided by the x-ray free-electron laser (FEL), strong interest has been kindled in sophisticated diffraction imaging techniques. In this Letter, we exploit such techniques for the diagnosis of the density distribution of the intense electron beams typically utilized in an x-ray FEL itself. We have implemented this method by analyzing the far-field coherent t...

Towards demonstration of electron cooling with bunched electron beam

Electron Amplification in Diamond

We report on recent progress toward development of secondary emission “amplifiers” for photocathodes. Secondary emission gain of over 300 has been achieved in transmission mode and emission mode for a variety of diamond samples. Techniques of sample preparation, including hydrogenation to achieve negative electron affinity (NEA), have been adapted to this application.

Electron Cooling Possibilities for Hera

Electron Cooling of the hadron beam in HERA could be a way to upgrade the luminosity for electron-proton and electron-heavy ion collisions. Because of the necessary electron energy of 450 MeV for cooling protons and about 180 MeV for cooling heavy ions the conventional approach using electrostatic DC sources is not possible. Instead an electron storage ring could be used. For this ring there ar...