نتایج جستجو برای: drift chamber
تعداد نتایج: 72761 فیلتر نتایج به سال:
Data accumulated with a high-precision vertex drift chamber operating in the PEP detector MAC are used for a precise measurement of the lifetime of the T lepton. Results from a decay-length analysis of a sample in which one T decays into one charged particle and the other to three charged particles are combined with those from an impact-parameter analysis of an independent sample of events that...
A 3-dimension particle in cell simulation code is developed to study the photoelectron cloud instabilities in KEK LER. The program has been decribed in detail. Numerical examples are shown for the photoelectron motion in various kinds of magnetic fields. Simulation shows solenoid is very effective to confine the photoelectron to the vicinity of the vacuum chamber wall and make a photoelectron f...
We present the construction of a planar drift chamber with wires stretched between two arms of a c-shaped aluminium frame. The special shape of the frame allows to extend the momentum acceptance of the COSY-11 detection system towards lower momenta without suppressing the high momentum particles. The proposed design allows for construction of tracking detectors covering small angles with respec...
In this paper statistical and time series models are used for determining the random drift of a dynamically Tuned Gyroscope (DTG). This drift is compensated with optimal predictive transfer function. Also nonlinear neural-network and fuzzy-neural models are investigated for prediction and compensation of the random drift. Finally the different models are compared together and their advantages a...
The TPC is the central detector of the CERN-LHC experiment ALICE. It is the largest TPC ever built with a gas volume of ~90 m and 557568 readout channels. The LHC is scheduled to commence operation in 2007 with pp-collisions. Before installation underground inside the ALICE L3 magnet, the TPC including its auxiliary systems and services, i.e., gas system, temperature monitoring system, drift ve...
Parametric down conversion of X-ray photons in diamond crystals was detected in two experiments, both using the phase-matching scheme first employed in the X-ray regime by Eisenberger & McCall [Phys. Rev. Lett. (1971), 26, 684-688]. The conversion events were detected by a combination of time-correlation spectroscopy and energy discrimination, using Si drift-chamber detectors. The time-correlat...
The 4th Concept detector presently being designed for the International Linear Collider introduces several innovations in order to achieve the necessary experimental goal of a detecter that is 2-to-10 times better than the already excellent SLC and LEP detectors. We introduce a dual-readout calorimeter system, a cluster counting drift chamber, and a second solenoid to return the magnetic flux w...
but also improves the uniformity of the spray pattern. Turbulence chamber nozzles are available in a turbo flood tip and now in the turbo flat-fan design. The turbo flatfan design shows great improvements in pattern uniformity when compared to the extended range flat-fan and other drift reduction flat-fan designs. In addition, the turbo flat-fan has significantly reduced the percentage of drift...
The symmetric ee collider CESR is undergoing a series of upgrades allowing for luminosities in excess of 2×10cms. The most important goals of the upgrade are precision measurement of standard model parameters Vcb, Vub, Vtd/Vts, fDs, and searching for CP violation and standard model violations in rare B decays. A new detector upgrade, called CLEO III, has started which includes a new silicon-wir...
The z lepton and mesons and baryons containing the charm (c) and bottom (b) quarks, are all found to have lifetimes in the range 10-13-10 -tz s [1] . A device able to resolve vertices to of the order of 1 mm is in principle capable of isolating the decays of these particles produced in e+ ecollisions . This paper describes the design, construction and performance of a pressurised drift chamber ...
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