391 research outputs found
Low Temperature Performance of a Large Area Avalanche Photodiode
A Large Area Avalanche Photodiode (LAAPD) was studied, aiming to access its
performance as light detector at low temperatures, down to -80 C. The excess
noise factor, F, was measured and found to be approximately independent of the
temperature. A linear dependence of F on the APD gain with a slope of 0.00239
+/- 0.00008 was observed for gains above 100. The detection of low intensity
light pulses, producing only a few primary electron-hole pairs in the
photodiode, is reported.Comment: 16 pages, 7 figures; was presented at 3-rd conference "New
Developments in Photodetection" Beaune, France, June 17-21, 2002; submitted
to NI
Development of liquid xenon detectors for medical imaging
In the present paper, we report on our developments of liquid xenon detectors
for medical imaging, positron emission tomography and single photon imaging, in
particular. The results of the studies of several photon detectors
(photomultiplier tubes and large area avalanche photodiode) suitable for
detection of xenon scintillation are also briefly described.Comment: 13 pages, 5 figures, presented on the International Workshop on
Techniques and Applications of Xenon Detectors (Xenon01), ICRR, Univ. of
Tokyo, Kashiwa, Japan, December 3-4, 2001 (submitted to proceedings
A model of the reflection distribution in the vacuum ultra violet region
A reflection model with three components, a specular spike, a specular lobe
and a diffuse lobe is discussed. This model was successfully applied to
describe reflection of xenon scintillation light (175 nm) by PTFE and other
fluoropolymers and can be used for Monte Carlo simulation and analysis of
scintillation detectors. The measured data favors a Trowbridge-Reitz
distribution function of ellipsoidal micro-surfaces. The intensity of the
coherent reflection increases with increasing angle of incidence, as expected,
since the surface appears smoother at grazing angles. The total reflectance
obtained for PTFE is about 70% for VUV light at normal incidence in vacuum and
estimated to be up to 100% in contact with liquid xenon
GEM operation in double-phase xenon
http://www.sciencedirect.com/science/article/B6TJM-4T7F5JF-5/2/897502f8049abd8c2dd3dffc3821f0f
ANTS2 package: simulation and experimental data processing for Anger camera type detectors
ANTS2 is a simulation and data processing package developed for position sensitive detectors with Anger camera type readout. The simulation module of ANTS2 is based on ROOT package from CERN, which is used to store the detector geometry and to perform 3D navigation. The module is capable of simulating particle sources, performing particle tracking, generating photons of primary and secondary scintillation, tracing optical photons and generating photosensor signals. The reconstruction module features several position reconstruction methods based on the statistical reconstruction algorithms (including GPU-based implementations), artificial neural networks and k-NN searches. The module can process simulated as well as imported experimental data containing photosensor signals. A custom library for B-spline parameterization of spatial response of photosensors is implemented which can be used to calculate and parameterize the spatial response of a detector. The package includes a graphical user interface with an extensive set of configuration, visualization and analysis tools. ANTS2 is being developed with the focus on the iterative (adaptive) reconstruction of the detector response using flood field irradiation data. The package is implemented in C++ programming language and it is a multiplatform, open source project.Peer Reviewe
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