RF bunch compression for single-shot femtosecond electron diffraction

No abstrac

Cool beams for ultrafast electron imaging

By near threshold photoionization of a laser-cooled and trapped atomic gas we create dense, picosecond electron bunches at electron temperatures three orders of magnitude lower than in conventional field and photoemission sources. The superior coherence properties of this ultracold source will enable single-shot electron diffraction of macromolecules and ultrafast nanodiffraction. Recently we have recorded the first diffraction patterns of graphite using the ultracold source. To control and manipulate highly coherent, ultrashort pulsed beams we are developing compact 3 GHz microwave cavities as versatile time-dependent electron optical elements. We have demonstrated bunch compression – longitudinal focusing – to below 100 fs using a 3 GHz microwave cavity in TM010 mode. Alternatively, a cavity in TM010 mode may be used to lower the energy spread of an electron bunch by longitudinal defocusing. We use microwave cavities in TM110 mode for measuring bunch lengths, but also to chop the continuous beam of an electron microscope into a high repetition rate train of femtosecond single-electron pulses while conserving emittance

Met koude elektronen atomen zien bewegen

In december 2007 was dr.ir Jom Luiten een van de gelukkige prijswinnaars van een Vici-subsidie. I-hf kreeg deze prijs voor een onderzoeksvoorstel waarmee hij atomen in actie wilde zien. Ondertussen zljn we een jaar verder en is er dus meer te vertellen over hoe het met het onderzoeksproject staat

Extreme beams for single-shot ultrafast electron diffraction

Abstract only

Ultracold and ultrafast electron source

Sheet presentati

Ultracold and ultrafast electron source

Abstract of the lecture

Taking snapshots of atomic motion using electrons

55 years after Richard Feynman’s famous Caltech lecture ‘There is plenty of room at the bottom’ [1], heralding the age of nano science and technology, many of the possibilities he envisaged have come true: Using electron microscopy it is nowadays possible to resolve and even identify individual atoms; STM and AFM not only provide us with similar spatial resolution on surfaces, but also allow dragging individual atoms around in a controlled way; X-ray diffraction has revealed the complicated structures of thousands of proteins, giving invaluable insight into the machinery of life

Ultracold electron and ion beams

Extracting electrons and ions from an ultracold plasma provides an entirely new way of generating charged-particle beams, which has the potential for advancing the state-of-the-art in beam brightness by orders of magnitude. This may have far-ranging implications for applications as diverse as time-resolved sub-picosecond electron microscopy, x-ray free electron lasers, and nanometer ion beam milling. In this talk I will dwell on a few of the exciting prospects for both science and industry and I will present experimental results of the first ultracold electron and ion beams, which were recently obtained at Eindhoven University