| Paper | Title | Page |
|---|---|---|
WEPPD058 |
Diagnostics of Ultra-short Low-charge Electron Bunches at REGAE | |
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| A new linac is commissioned at DESY mainly as the electron source for femtosecond electron diffraction facility REGAE (Relativistic Electron Gun for Atomic Exploration). REGAE enables studies on structural dynamics of atomic transition states occurring in the sub-hundred femtosecond time-scale. REGAE comprises a photo-cathode gun followed by normal conducting 1.5 cell rf-cavity to provide sub pC charge electron-bunches of 2-5 MeV with a coherence length of 30nm. In order to produce and maintain such electron bunches, sophisticated single-shot diagnostics is desired e.g. emittance, energy, energy-spread and bunch-length measurement. For a typical electron diffraction pattern at REGAE a large dynamical range of 1 to 104 electrons per 100 um2 is expected. It is desired to have a detection system able to detect all electrons, preferentially single-shot, with a good resolution. In order to use the advantage of a pulsed source (versus a DC-gun) it is mandatory to record all the individual diffraction patterns that can be produced at REGAE. This rep-rate can be up to 50 Hz. This relatively high rep-rate makes it even more challenging to deal with low intensity detection especially in single-shot mode. In this contribution the conceptual ideas, realization and preliminary results of these diagnostics will be presented. | ||