Mapping transient electric fields with picosecond electron bunches

Mapping transient electric fields with picosecond electron bunches.

Transient electric fields, which are an important but hardly explored parameter of laser plasmas, can now be diagnosed experimentally with combined ultrafast temporal resolution and field sensitivity, using femtosecond to picosecond electron or proton pulses as probes. However, poor spatial resolution poses great challenges to simultaneously recording both the global and local field features. H...

High-coherence picosecond electron bunches from cold atoms.

Ultrafast electron diffraction enables the study of molecular structural dynamics with atomic resolution at subpicosecond timescales, with applications in solid-state physics and rational drug design. Progress with ultrafast electron diffraction has been constrained by the limited transverse coherence of high-current electron sources. Photoionization of laser-cooled atoms can produce electrons ...

Electric fields associated with transient surface currents

Electro-Optic Sampling of Transient Fields From the Passage of High-Charge Electron Bunches

When a relativistic electron bunch traverses a structure, strong electric fields are induced in its wake. We present measurements of the electric field as a function of time as measured at a fixed location in the beam line. For a 12 nC bunch of duration 4.2 ps FWHM, the peak field is measured > 0:5 MV/m. Time resolution of 5 ps is achieved using electro-optic sampling with a lithium tantalate (...

ELECTRO OPTICAL SAMPLING OF COHERENT SYNCHROTRON RADIATION FOR PICOSECOND ELECTRON BUNCHES WITH FEW pC CHARGE

Electro Optical (EO) sampling is a promising nondestructive method for measuring ultra short (sub-ps) electron bunches. The FEMTO slicing experiment at the Swiss Light Source modulates about 3 pC of the 5 nC electron bunch longitudinally. The coherent synchrotron radiation (CSR) emitted by this substructure was sampled by 100 fs long pulses from an Yb fiber laser in EO crystals of gallium phosp...