Arizona State University, Tempe, USA
UCLA, Los Angeles, USA
SLAC, Menlo Park, California, USA
We describe Bragg diffraction of relativistic electron beams through a patterned Si crystal consisting of alternating thick and thin strips to produce nanometer scale electron density modulations. Multi-slice simulations show that a two-beam situation can be set up where, for a particular thickness of Si, nearly 100% of the electron beam is diffracted. Plans are underway to carry out experiments showing this effect in UCLA's ultrafast electron microscopy lab with 3.5 MeV electrons. We will select either the diffracted beam or the primary beam with a small aperture in the diffraction plane of a magnetic lens, and so record either the dark or bright field magnified image of the strips. Our first goal is to observe the nanopatterned beam at the image plane. We will then investigate various crystal thickness and sample orientations to maximize the contrast in the pattern and explore tuning the period of the modulation through varying magnification.
SLAC, Menlo Park, California, USA
DESY, Hamburg, Germany
Stanford University, Stanford, California, USA
Tech-X, Boulder, Colorado, USA
TEMF, TU Darmstadt, Darmstadt, Germany
University of Erlangen-Nuremberg, Erlangen, Germany
Friedrich-Alexander Universität Erlangen-Nuernberg, University Erlangen-Nuernberg LFTE, Erlangen, Germany
PSI, Villigen PSI, Switzerland
MIT, Cambridge, Massachusetts, USA
CFEL, Hamburg, Germany
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
Purdue University, West Lafayette, Indiana, USA
UCLA, Los Angeles, California, USA
EPFL, Lausanne, Switzerland
Dielectric laser acceleration of electrons has recently been demonstrated with significantly higher accelerating gradients than other structure-based linear accelerators. Towards the development of an integrated 1 MeV electron accelerator based on dielectric laser accelerator technologies, development in several relevant technologies is needed. In this work, recent developments on electron sources, bunching, accelerating, focussing, deflecting and laser coupling structures are reported. With an eye to the near future, components required for a 1 MeV kinetic energy tabletop accelerator producing sub-femtosecond electron bunches are outlined.
