نتایج جستجو برای: transition radiation
تعداد نتایج: 495204 فیلتر نتایج به سال:
Transition radiation from an ultrarelativistic particle flying out of the crystal surface at an arbitrary angle is considered. The expression for the spectral-angular density of radiation in the high frequencies has been obtained. The dependence of the resulting radiation distribution depending on the directions of the crystal main axis relative to the surface and the angle of the emission part...
Several prototypes of the Transition Radiation Tracker for the ATLAS experiment at the LHC have been built and tested at the CERN SPS accelerator. Results from detailed studies of the straw-tube hit registration efficiency and drifttime measurements and of the pion and electron spectra without and with radiators are presented. r 2004 Elsevier B.V. All rights reserved.
The wave zone condition for TR produced on the boundary between a metal and vacuum is examined. It is shown that in both forward and backward directions the wave zone sets in at the same distance, that is of the order of the formation length for forward TR. The features of backward TR in the pre-wave zone are considered. PACS:41.60.-m; 41.75.Ht Submitted to Physics Letters A It is a widely acce...
The Transition Radiation Detector (TRD) belongs to the central barrel detectors of the ALICE experiment at the LHC at CERN. It is composed of 540 large area drift chambers, with a total of 1181952 readout pads (1728 or 2304 per chamber). To ensure the optimal performance of the detector, designed for electron/pion identification and charged particle tracking, including triggering for high-pt el...
At the beginning of thermonuclear ignition in fusion plasma, the bremsstrahlung radiation is dominant phenomenon, the photons distribution function is Planckian and plasma is considered as optically thick one. But at a certain energy, the bremsstrahlung radiation and Compton scattering losses rates become equal and plasma makes a transition from optically thick to optically thin and photons dis...
In this Research, the transition from equilibrium ignition to non-equilibrium burn was studied by DEIRA4 code for simple spherical targets with the dimensions of several mm. It consisted of inner DT fuel and outer Au layers driven by the 209Bi heavy ions beam. Because of their higher plasma opacity, it was expected that they could trap much of the produced charged particles, radiation or even f...
If the neutrino has a finite mass and a magnetic moment it would produce transition radiation when crossing the interface between two media of which plasma frequencies are ω 1 and ω 2 (ω 1 ≫ ω 2). We found that the probability of transition radiation is larger by an order of magnitude using the quantum theory than that recently reported by one of us using classical electrodynam-ics, and that th...
A new large-area detector system was constructed at the University of Chicago for direct measurements of heavy cosmic ray nuclei (oxygen to iron) up to about 10 TeV/nucleon. TRACER (”Transition Radiation Array for Cosmic Energetic Radiation”) uses plastic scintillators to measure charge and a proportional tube array to measure energy via specific ionization and transition radiation. While TRACE...
We have experimentally observed the dynamics of an antiferromagnetic sodium Bose-Einstein condensate quenched through a quantum phase transition. Using an off-resonant microwave field coupling the F = 1 and F = 2 atomic hyperfine levels, we rapidly switched the quadratic energy shift q from positive to negative values. At q = 0, the system undergoes a transition from a polar to antiferromagneti...
We discuss techniques to tune and shape the long-range part of the interaction potentials in quantum gases of bosonic polar molecules by dressing rotational excitations with static and microwave fields. This provides a novel tool towards engineering strongly correlated quantum phases in combination with low-dimensional trapping geometries. As an illustration, we discuss the 2D superfluid-crysta...
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