Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 45: Poster Tuesday: Ultrafast Processes
O 45.2: Poster
Tuesday, April 2, 2019, 18:00–20:00, Poster D
Multidimensional photoemission spectroscopy data: A framework for distributed and volumetric processing — Rui P. Xian1, Yves Acremann2, Steinn Y. Agustsson3, Maciej Dendzik1, Davide Curcio4, Dmytro Kutnyakhov5, Ralph Ernstorfer1, and •Laurenz Rettig1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 2Department of Physics, ETH, Zurich, Switzerland — 3Department of Physics, University of Mainz, Mainz, Germany — 4Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark — 5DESY Photon Science, Hamburg, Germany
Recent developments of photoelectron spectrometers based on time-of-flight techniques using multi-dimensional delay-line detectors such as k-TOFs and momentum microscopes are fueling the emerging field of multidimensional photoemission spectroscopy (MPES). It enables a rapid volumetric mapping of the electronic band structure of materials and naturally incorporates further dimensions such as kz dispersion, spin or pump-probe time. A significant challenge for the data handling are the high throughput data streams of individual detected electrons with multi-dimensional coordinates, and the vast amount of events needed to fill a typical dataset, which reach into the order of hundreds of millions to tens of billions and requires histogramming, corrections and calibrations to convert into a structured format. We have developed a distributed open-source pipeline to process these data streams for use at large facilities and in tabletop experiments. Event-wise operation allows reliable experimental diagnosis and artifact correction.