Time resolved x-ray microscopy allows researchers to investigate variation of the electronic structure of a material during chemical, structural or magnetic changes with picosecond time resolution. In this talk we will show how such a microscope can be realized using a field programming gate array in combination with a fast point detector. We will show results based on an existing setup, e.g. movies of spin waves in confined magnetic structures with a periodicity of a few ns, but also describe how this method can be extended to dynamical processes with longer observation times using state of the art FPGA technology. Time resolved measurements with high spatial resolution will be an important part of research at future x-ray sources like e.g. ALS-U.
The APEX electron source at LBNL combines the high-repetition-rate with the high beam brightness typical of photoguns, delivering low emittance electron pulses at MHz frequency. Proving the high beam quality of the beam is an essential step for the success of the experiment, opening the doors of the high average power to brightness-hungry applications as X-Ray FELs, MHz ultrafast electron diffraction etc.. As first step, a complete characterization of the beam parameters is foreseen at the Gun beam energy of 750 keV. Diagnostics for low and high current measurements have been installed and tested, and measurements of cathode lifetime and thermal emittance in a RF environment with mA current performed. The recent installation of a double slit system, a deflecting cavity and a high precision spectrometer, allow the exploration of the full 6D phase space. Here we discuss the present layout of the machine and future upgrades, showing the latest results at low and high repetition rate, together with the tools and techniques used.
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