Bunch mode specific rate corrections for PILATUS3 detectors.
PILATUS X-ray detectors are in operation at many synchrotron beamlines around the world. This article reports on the characterization of the new PILATUS3 detector generation at high count rates. As for all counting detectors, the measured intensities have to be corrected for the dead-time of the counting mechanism at high photon fluxes. The large number of different bunch modes at these synchrotrons as well as the wide range of detector settings presents a challenge for providing accurate corrections. To avoid the intricate measurement of the count rate behaviour for every bunch mode, a Monte Carlo simulation of the counting mechanism has been implemented, which is able to predict the corrections for arbitrary bunch modes and a wide range of detector settings. This article compares the simulated results with experimental data acquired at different synchrotrons. It is found that the usage of bunch mode specific corrections based on this simulation improves the accuracy of the measured intensities by up to 40% for high photon rates and highly structured bunch modes. For less structured bunch modes, the instant retrigger technology of PILATUS3 detectors substantially reduces the dependency of the rate correction on the bunch mode. The acquired data also demonstrate that the instant retrigger technology allows for data acquisition up to 15 million photons per second per pixel.
DECTRIS Ltd, 5400 Baden, Switzerland.
P
P
Trueb
ETH Zurich, 8093 Zurich, Switzerland.
C
C
Dejoie
DECTRIS Ltd, 5400 Baden, Switzerland.
M
M
Kobas
EPF Lausanne, 1015 Lausanne, Switzerland.
P
P
Pattison
School of Physics, The University of Melbourne, Victoria 3010, Australia.
D J
DJ
Peake
DECTRIS Ltd, 5400 Baden, Switzerland.
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V
Radicci
School of Physics, The University of Melbourne, Victoria 3010, Australia.
B A
BA
Sobott
Argonne National Laboratory, Argonne, IL 60439, USA.
D A
DA
Walko
DECTRIS Ltd, 5400 Baden, Switzerland.
C
C
Broennimann
Monte Carlo simulation; PILATUS detectors; count rate correction; photon counting