Open AccessPulse‐resolved multi‐photon X‐ray detection at 31 MHz based on a quadrant avalanche photodiode
Author(s) -
Reusch Tobias,
Osterhoff Markus,
Agricola Johannes,
Salditt Tim
Publication year - 2014
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577514006730
Subject(s) - desy , physics , avalanche photodiode , optics , photon counting , photon , detector , synchrotron , photodiode , storage ring , photodetector , synchrotron radiation , beam (structure)
The technical realisation and the commissioning experiments of a high‐speed X‐ray detector based on a quadrant avalanche silicon photodiode and high‐speed digitizers are described. The development is driven by the need for X‐ray detectors dedicated to time‐resolved diffraction and imaging experiments, ideally requiring pulse‐resolved data processing at the synchrotron bunch repetition rate. By a novel multi‐photon detection scheme, the exact number of X‐ray photons within each X‐ray pulse can be recorded. Commissioning experiments at beamlines P08 and P10 of the storage ring PETRA III, at DESY, Hamburg, Germany, have been used to validate the pulse‐wise multi‐photon counting scheme at bunch frequencies ≥31 MHz, enabling pulse‐by‐pulse readout during the PETRA III 240‐bunch mode with single‐photon detection capability. An X‐ray flux of ≥3.7 × 10 9 photons s −1 can be detected while still resolving individual photons at low count rates.