TY  - JOUR
A1  - Send, Sebastian
A1  - Abboud, Ali
A1  - Hartmann, Robert
A1  - Huth, M.
A1  - Leitenberger, Wolfram
A1  - Pashniak, N.
A1  - Schmidt, J.
A1  - Strüder, Lothar
A1  - Pietsch, Ullrich
T1  - Characterization of a pnCCD for applications with synchrotron radiation
JF  - Nuclear instruments & methods in physics research : a journal on accelerators, instrumentation and techniques applied to research in nuclear and atomic physics, materials science and related fields in physics ; A, Accelerators, spectrometers, detectors and associated equipment
N2  - In this work we study the response of a pnCCD by means of X-ray spectroscopy in the energy range between 6 key and 20 key and by Laue diffraction techniques. The analyses include measurements of characteristic detector parameters like energy resolution, count rate capability and effects of different gain settings. The limit of a single photon counting operation in white beam X-ray diffraction experiments is discussed with regard to the occurrence of pile-up events, for which the energy information about individual photons is lost. In case of monochromatic illumination the pnCCD can be used as a fast conventional CCD with a charge handling capacity (CHC) of about 300,000 electrons per pixel. If the CHC is exceeded, any surplus charge will spill to neighboring pixels perpendicular to the transfer direction due to electrostatic repulsion. The possibilities of increasing the number of storable electrons are investigated for different voltage settings by exposing a single pixel with X-rays generated by a microfocus X-ray source. The pixel binning mode is tested as an alternative approach that enables a pnCCD operation with significantly shorter readout times.
KW  - pnCCD
KW  - X-ray spectroscopy
KW  - X-ray imaging
KW  - Energy-dispersive Laue diffraction
Y1  - 2013
U6  - https://doi.org/10.1016/j.nima.2013.01.044
SN  - 0168-9002
VL  - 711
IS  - 5
SP  - 132
EP  - 142
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Abboud, Ali
A1  - Send, Sebastian
A1  - Pashniak, N.
A1  - Leitenberger, Wolfram
A1  - Ihle, Sebastian
A1  - Huth, M.
A1  - Hartmann, Robert
A1  - Strüder, Lothar
A1  - Pietsch, Ullrich
T1  - Sub-pixel resolution of a pnCCD for X-ray white beam applications
JF  - Journal of instrumentation
N2  - A new approach to achieve sub-pixel spatial resolution in a pnCCD detector with 75 x 75 mu m(2) pixel size is proposed for X-ray applications in single photon counting mode. The approach considers the energy dependence of the charge cloud created by a single photon and its split probabilities between neighboring pixels of the detector based on a rectangular model for the charge cloud density. For cases where the charge of this cloud becomes distributed over three or four pixels the center position of photon impact can be reconstructed with a precision better than 2 mu m. The predicted charge cloud sizes are tested at selected X-ray fluorescence lines emitting energies between 6.4 keV and 17.4 keV and forming charge clouds with size (rms) varying between 8 mu m and 10 mu m respectively. The 2 mu m enhanced spatial resolution of the pnCCD is verified by means of an x-ray transmission experiment throughout an optical grating.
KW  - Solid state detectors
KW  - Interaction of radiation with matter
KW  - Detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc)
Y1  - 2013
U6  - https://doi.org/10.1088/1748-0221/8/05/P05005
SN  - 1748-0221
VL  - 8
IS  - 3
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  -