CdTe Timepix detectors for single-photon spectroscopy and linear polarimetry of high-flux hard x-ray radiation

2016 ◽  
Vol 87 (4) ◽  
pp. 043106 ◽  
Author(s):  
C. Hahn ◽  
G. Weber ◽  
R. Märtin ◽  
S. Höfer ◽  
T. Kämpfer ◽  
...  
Keyword(s):  
Single Photon ◽  
High Flux ◽  
X Ray

Development of Diamond-Based X-ray Detection for High Flux Beamline Diagnostics

2009 ◽  
Vol 1203 ◽  
Author(s):  
Jen Bohon ◽  
John Smedley ◽  
Erik M. Muller ◽  
Jeffrey W. Keister
Keyword(s):  
Single Crystal ◽  
Linear Response ◽  
Voltage Dependence ◽  
Cvd Diamond ◽  
High Flux ◽  
National Synchrotron Light Source ◽  
X Ray ◽  
Single Crystal Diamond ◽  
Synchrotron Light ◽  
Pulse Structure

AbstractHigh quality single crystal and polycrystalline CVD diamond detectors with platinum contacts have been tested at the white beam X28C beamline at the National Synchrotron Light Source under high-flux conditions. The voltage dependence of these devices has been measured under DC and pulsed-bias conditions, establishing the presence or absence of photoconductive gain in each device. Linear response has been achieved over eleven orders of magnitude when combined with previous low flux studies. Temporal measurements with single crystal diamond detectors have resolved the ns scale pulse structure of the NSLS.

Subpixel resolution in CdTe Timepix3 pixel detectors

2018 ◽  
Vol 25 (6) ◽  
pp. 1650-1657 ◽  
Author(s):  
Mohamad Khalil ◽  
Erik Schou Dreier ◽  
Jan Kehres ◽  
Jan Jakubek ◽  
Ulrik Lund Olsen
Keyword(s):  
Single Photon ◽  
Weighted Average ◽  
European Synchrotron Radiation Facility ◽  
Time Of Arrival ◽  
Pixel Detector ◽  
Step Size ◽  
X Ray ◽  
Pixel Detectors ◽  
Individual Photon ◽  
Subpixel Resolution

Timepix3 (256 × 256 pixels with a pitch of 55 µm) is a hybrid-pixel-detector readout chip that implements a data-driven architecture and is capable of simultaneous time-of-arrival (ToA) and energy (ToT: time-over-threshold) measurements. The ToA information allows the unambiguous identification of pixel clusters belonging to the same X-ray interaction, which allows for full one-by-one detection of photons. The weighted mean of the pixel clusters can be used to measure the subpixel position of an X-ray interaction. An experiment was performed at the European Synchrotron Radiation Facility in Grenoble, France, using a 5 µm × 5 µm pencil beam to scan a CdTe-ADVAPIX-Timepix3 pixel (55 µm × 55 µm) at 8 × 8 matrix positions with a step size of 5 µm. The head-on scan was carried out at four monochromatic energies: 24, 35, 70 and 120 keV. The subpixel position of every single photon in the beam was constructed using the weighted average of the charge spread of single interactions. Then the subpixel position of the total beam was found by calculating the mean position of all photons. This was carried out for all points in the 8 × 8 matrix of beam positions within a single pixel. The optimum conditions for the subpixel measurements are presented with regards to the cluster sizes and beam subpixel position, and the improvement of this technique is evaluated (using the charge sharing of each individual photon to achieve subpixel resolution) versus alternative techniques which compare the intensity ratio between pixels. The best result is achieved at 120 keV, where a beam step of 4.4 µm ± 0.86 µm was measured.

Thermal Detectors as Single Photon X-Ray Spectrometers

1985 ◽  
Vol 32 (1) ◽  
pp. 134-138 ◽  
Author(s):  
S. Harvey Moseley ◽  
R. L. Kelley ◽  
J. C. Mather ◽  
R. F. Mushotzky ◽  
A. E. Szymkowiak ◽  
...  
Keyword(s):  
Single Photon ◽  
X Ray ◽  
Thermal Detectors

Iodixanol is readily eliminated by hemodialysis

1998 ◽  
Vol 39 (4) ◽  
pp. 372-374 ◽  
Author(s):  
K. J. Berg ◽  
B. Rolfsen ◽  
G. Stake
Keyword(s):  
Blood Flow ◽  
Contrast Medium ◽  
Hollow Fiber ◽  
Cellulose Triacetate ◽  
High Flux ◽  
Hollow Fiber Membranes ◽  
Polysulfone Membrane ◽  
Membrane Area ◽  
X Ray

Purpose, Material and Methods, and Results: The dialyzability of the high-molecular X-ray contrast medium iodixanol was examined in an in vitro hemo-dialysis model using two different hollow fiber membranes: one high-flux (polysulfone) membrane and one intermediate-flux (cellulose triacetate) membrane. Blood flow was 200 ml/min and membrane area 1.3 m2. The dialyzer clearance of iodixanol dissolved in a mixture of leukocyte-filtered SAG-M blood and compatible citrate plasma was 134.2±3.6 ml/min for the polysulfone membrane and 113.0±3.6 ml/min for the cellulose triacetate membrane. Conclusion: Iodixanol is readily dialyzed through commercial high-flux membranes.

Beyond single photon counting X-ray detectors

2011 ◽  
Vol 628 (1) ◽  
pp. 238-241 ◽  
Author(s):  
A. Bergamaschi ◽  
R. Dinapoli ◽  
B. Henrich ◽  
I. Johnson ◽  
A. Mozzanica ◽  
...  
Keyword(s):  
Single Photon ◽  
Photon Counting ◽  
Single Photon Counting ◽  
X Ray

scholarly journals Single photon ionization of hydrogen bonded clusters with a soft x-ray laser: (HCOOH)x and (HCOOH)y(H2O)z

2007 ◽  
Vol 126 (24) ◽  
pp. 244301 ◽  
Author(s):  
S. Heinbuch ◽  
F. Dong ◽  
J. J. Rocca ◽  
E. R. Bernstein
Keyword(s):  
Single Photon ◽  
X Ray ◽  
Single Photon Ionization ◽  
Photon Ionization ◽  
Hydrogen Bonded
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