The Experts below are selected from a list of 4131 Experts worldwide ranked by ideXlab platform
Alexander Snigirev - One of the best experts on this subject based on the ideXlab platform.
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extracting the jet Azimuthal anisotropy from higher order cumulants
arXiv: High Energy Physics - Phenomenology, 2003Co-Authors: I Lokhtin, L I Sarycheva, Alexander SnigirevAbstract:We analyze the method for calculation of a coefficient of jet Azimuthal anisotropy without reconstruction of the nuclear reaction plane considering the higher order correlators between the Azimuthal Position of jet axis and the angles of particles not incorporated in the jet. The reliability of this technique in the real physical situation under LHC conditions is illustrated.
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extracting the jet Azimuthal anisotropy from higher order cumulants
European Physical Journal C, 2003Co-Authors: I Lokhtin, L I Sarycheva, Alexander SnigirevAbstract:We analyze the calculation method of the coefficient of the jet Azimuthal anisotropy without reconstruction of the nuclear reaction plane, considering the higher order correlators between the Azimuthal Position of the jet axis and the angles of the particles not incorporated in the jet. The reliability of this technique in the real physical situation under LHC conditions is illustrated.
Yuanyu Jau - One of the best experts on this subject based on the ideXlab platform.
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enhanced cooperativity for quantum nondemolition measurement induced spin squeezing of atoms coupled to a nanophotonic waveguide
Physical Review A, 2018Co-Authors: Yuanyu Jau, Ivan H DeutschAbstract:We study the enhancement of cooperativity in the atom-light interface near a nanophotonic waveguide for application to quantum nondemolition (QND) measurement of atomic spins. Here the cooperativity per atom is determined by the ratio between the measurement strength and the decoherence rate. Counterintuitively, we find that by placing the atoms at an Azimuthal Position where the guided probe mode has the lowest intensity, we increase the cooperativity. This arises because the QND measurement strength depends on the interference between the probe and scattered light guided into an orthogonal polarization mode, while the decoherence rate depends on the local intensity of the probe. Thus, by proper choice of geometry, the ratio of good-to-bad scattering can be strongly enhanced for highly anisotropic modes. We apply this to study spin squeezing resulting from QND measurement of spin projection noise via the Faraday effect in two nanophotonic geometries, a cylindrical nanofiber and a square waveguide. We find that, with about 2500 atoms and using realistic experimental parameters, $\ensuremath{\sim}6.3$ and $\ensuremath{\sim}13$ dB of squeezing can be achieved on the nanofiber and square waveguide, respectively.
Ivan H Deutsch - One of the best experts on this subject based on the ideXlab platform.
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enhanced cooperativity for quantum nondemolition measurement induced spin squeezing of atoms coupled to a nanophotonic waveguide
Physical Review A, 2018Co-Authors: Yuanyu Jau, Ivan H DeutschAbstract:We study the enhancement of cooperativity in the atom-light interface near a nanophotonic waveguide for application to quantum nondemolition (QND) measurement of atomic spins. Here the cooperativity per atom is determined by the ratio between the measurement strength and the decoherence rate. Counterintuitively, we find that by placing the atoms at an Azimuthal Position where the guided probe mode has the lowest intensity, we increase the cooperativity. This arises because the QND measurement strength depends on the interference between the probe and scattered light guided into an orthogonal polarization mode, while the decoherence rate depends on the local intensity of the probe. Thus, by proper choice of geometry, the ratio of good-to-bad scattering can be strongly enhanced for highly anisotropic modes. We apply this to study spin squeezing resulting from QND measurement of spin projection noise via the Faraday effect in two nanophotonic geometries, a cylindrical nanofiber and a square waveguide. We find that, with about 2500 atoms and using realistic experimental parameters, $\ensuremath{\sim}6.3$ and $\ensuremath{\sim}13$ dB of squeezing can be achieved on the nanofiber and square waveguide, respectively.
I Lokhtin - One of the best experts on this subject based on the ideXlab platform.
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extracting the jet Azimuthal anisotropy from higher order cumulants
arXiv: High Energy Physics - Phenomenology, 2003Co-Authors: I Lokhtin, L I Sarycheva, Alexander SnigirevAbstract:We analyze the method for calculation of a coefficient of jet Azimuthal anisotropy without reconstruction of the nuclear reaction plane considering the higher order correlators between the Azimuthal Position of jet axis and the angles of particles not incorporated in the jet. The reliability of this technique in the real physical situation under LHC conditions is illustrated.
-
extracting the jet Azimuthal anisotropy from higher order cumulants
European Physical Journal C, 2003Co-Authors: I Lokhtin, L I Sarycheva, Alexander SnigirevAbstract:We analyze the calculation method of the coefficient of the jet Azimuthal anisotropy without reconstruction of the nuclear reaction plane, considering the higher order correlators between the Azimuthal Position of the jet axis and the angles of the particles not incorporated in the jet. The reliability of this technique in the real physical situation under LHC conditions is illustrated.
Patto M Alliso - One of the best experts on this subject based on the ideXlab platform.
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effect of spark location and laminar flame speed on the ignition transient of a premixed annular combustor
Combustion and Flame, 2020Co-Authors: Roberto Ciardiello, Pedro M De Oliveira, Aaro W Skiba, E Mastorakos, Patto M AllisoAbstract:Abstract The flame expansion process (“light-round”) during the ignition transient in annular combustors depends on a number of parameters such as equivalence ratio (and hence laminar burning velocity, SL, of the mixture), turbulent intensity, mean flow magnitude and direction, geometry, and spark location. Here, an experimental study on a fully premixed, swirled, bluff body stabilised annular combustor is carried out to identify the sensitivity of the light-round to these parameters. A wide range of conditions were assessed: two inter-burner spacing distances, two fuels (methane and ethylene), bulk velocities from 10 to 30 m/s, and ϕ between 0.75 and 1 for methane and 0.58 and 0.9 for ethylene. The spark location was varied longitudinally (x/D = 0.5 and x/D = 5, where D is the bluff body diameter, expected to lie inside and downstream of the inner recirculation zone of a single burner, respectively) and Azimuthally. The propagation of the flame during the ignition transient was investigated via high speed (10 kHz) OH* chemiluminescence using two cameras to simultaneously image the annular chamber from axially downstream and from the side of the combustor. The pattern of flame propagation depended on the initial longitudinal spark location and comprised of burner-to-burner propagation close to the bluff bodies and upstream propagation of the flame front. The spark Azimuthal Position, in this horizontal configuration, had a negligible impact on the light-round time (τLR), thus buoyancy plays a minor role in the process. In contrast, sparking at x/D = 5 resulted in an increase in τLR by ~ 30–40% for all the conditions examined. The inter-burner spacing had a negligible effect on τLR. When increasing bulk velocity, τLR decreased. For a constant bulk velocity, τLR depended strongly on SL and it was found that mixtures with the same SL from different fuels resulted in the same τLR. Further, the observed propagation speed, corrected for dilatation, was approximately proportional to SL and was within 30% of estimates of the turbulent flame speed at the same conditions. These findings suggest that SL is one of the controlling parameters of the light-round process; hence turbulent flame propagation has a major role in the light-round process, in addition to dilatation and flame advection by the mean flow. The results reported in the study help explain the mechanism of light-round and can assist the development of efficient ignition procedures in aviation gas turbines.
