フォトカソードRF電子銃を用いた超高速時間分解MeV透過電子回折装置の開発

抄録

A compact electron diffractometer with a laser-driven photocathode gun generates probe electron pulses with 3 MeV in energy, temporal width less than 100 fs, and more than 1×10⁷ electrons per pulse. A single-shot transmission electron diffraction from Si single crystals has been detected with high quality and excellent signal-to-noise ratio. Energy spread and emittance characteristics of the diffractometer have been evaluated. The ultimate characteristics provides sound basis for future construction of time-resolved electron microscopes with fs-temporal resolution.