|
|
|
|
|
3.
|
Cross Talk Study to the Single Photon Response of a Flat Panel PMT for the RICH Upgrade at LHCb
Reference: Poster-2009-137
Keywords: LHCb RICH Upgrade Cross Talk
Created: 2009. -11 p
Creator(s): Arnaboldi, C; Artuso, M; Calvi, M; Fanchini, E; Gotti, C [...]
The Ring Imaging CHerenkov, RICH, detector at LHCb is now readout by Hybrid Photon Detectors. In view of its upgrade a possible option is the adoption of the flat panel Photon Multipliers Tubes, PMT. An important issue for the good determination of the rings produced in the sensitive media is a negligible level of cross talk. We have experimentally studied the cross talk from the 64x64 pixels of the H9500 PMT from Hamamatsu. Results have shown that at the single photon signal level, as expected at LHCb, the statistics applied to the small number of electrons generated at the first dynode of the PMT chain leads to a cross talk mechanism that must be interpreted in term of the percentage of the number of induced signals rather than on the amplitude of the induced signals. The threshold to suppress cross talk must be increased to a significant fraction of the single photon signal for the worst case. The number of electrons generated at the first dynode is proportional to the biasing voltage. Measurements have shown that the suppressing threshold can be lowered acting on this latter parameter.
Related links:
Conference Nuclear Science Symposium Medical Imaging Conference
|
© CERN Geneva
Fulltext
|
|
|
|
Detailed record
|
|
|
|
|
|
|
6.
|
 icecube results 2013
The latest IceCube results 25'
The IceCube detector is unique. It uses the Antarctic glacier ice as a part of the detector.
The optical detector observes Cherenkov light from secondary charged particles resulting
from a neutrino interaction in the ice. The transparent ice media enabled to realize 1 km^3
large detection volume in order to detect rarely interacting particles. Neutrinos are ideal
probe in order to search for the deep universe because they rarely interact with matters and are not deflected by the magnetic field. Neutrinos are thought to be generated through collisions of hadronic particles accelerated at astronomical sources such as active galactic nuclei and gamma-ray bursts. IceCube aims to detect neutrinos from such astronomical sources. Recently, IceCube found 28 neutrinos above approximately 30 TeV. These events are not fully explained by background of approximately 10 derived from atmospheric origin, deviating at the 4sigma level. Therefore the result represent the first evidence for high energy neutrinos of an extraterrestrial origin. IceCube also contributes to elementary particle physics by searching for neutrinos produced in self-annihilation of SUSY particle such as neutralinos and by investigating atmospheric neutrino oscillations, and it explores cosmic-ray physics with the surface detector, IceTop. I will give an overview of the latest IceCube results and the corresponding implications.
Speaker: Prof. KEIICHI MASE (Chiba University)
URL: https://www3.hepl.phys.nagoya-u.ac.jp/indico/
|
|
|
|
|
|
|
Subscribe to basket
Copy item