15,513 research outputs found
Behaviour in Magnetic Fields of Fast Conventional and Fine-Mesh Photomultipliers
The performance of both conventional and fine-mesh Hamamatsu photomultipliers
has been measured inside moderate magnetic fields. This has allowed the test of
effective shielding solutions for photomultipliers, to be used in
time-of-flight detectors based on scintillation counters. Both signal amplitude
reduction or deterioration of the timing properties inside magnetic fields have
been investigated
First results of systematic studies done with different types of Silicon Photomultipliers
The presented results are obtained during the first steps taken in order to
develop a setup and measurement procedures which allow to compare properties of
diverse kinds of silicon photomultipliers. The response to low-intensity light
was studied for silicon photomultipliers produced by CPTA (Russia), Hamamatsu
(Japan), ITC-irst (Italy) and SensL (Ireland).Comment: 3 pages, 3 figures, proceedings of the Internationa Linear Collider
Workshop LCWS2007, Hamburg, German
Afterpulse Measurements of R7081 Photomultipliers for the Double Chooz Experiment
We present the results of afterpulse measurements performed as qualification
test for 473 inner detector photomultipliers of the Double Chooz experiment.
The measurements include the determination of a total afterpulse occurrence
probability as well as an average time distribution of these pulses.
Additionally, more detailed measurements with different light sources and
simultaneous charge and timing measurements were performed with a few
photomultipliers to allow a more detailed understanding of the effect. The
results of all measurements are presented and discussed
Calculation of time resolution of the J-PET tomograph using the Kernel Density Estimation
In this paper we estimate the time resolution of the J-PET scanner built from
plastic scintillators. We incorporate the method of signal processing using the
Tikhonov regularization framework and the Kernel Density Estimation method. We
obtain simple, closed-form analytical formulas for time resolutions. The
proposed method is validated using signals registered by means of the single
detection unit of the J-PET tomograph built out from 30 cm long plastic
scintillator strip. It is shown that the experimental and theoretical results,
obtained for the J-PET scanner equipped with vacuum tube photomultipliers, are
consistent.Comment: 25 pages, 11 figure
An optical readout for a fibre tracker
The performance of 16 and 64 channel photomultipliers coupled to
scintillating fibres has been tested. The devices are sensitive to single
photoelectrons, show little gain losses for magnetic fields up to 100 Gauss and
have moderate optical cross-talk. The maximum channel to channel gain
variations reach a factor two for the 16 channel version and a factor of four
for the 64 channel PM. The measurements and simulations indicate that the
photomultipliers are well suited for the light detection in fibre trackers.Comment: 11 pages, 9 picture
High Energy Cosmic Neutrinos Astronomy: The ANTARES Project
Neutrinos may offer a unique opportunity to explore the far Universe at high
energy. The ANTARES collaboration aims at building a large undersea neutrino
detector able to observe astrophysical sources (AGNs, X-ray binary systems,
...) and to study particle physics topics (neutrino oscillation, ...). After
a description of the research opportunities of such a detector, a status report
of the experiment will be made.Comment: Talk given at the 19th Texas Symposium, Paris, December 199
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