The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform
Xi Chen - One of the best experts on this subject based on the ideXlab platform.
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molecular dynamics simulation on explosive boiling of Liquid Argon film on copper nanochannels
Applied Thermal Engineering, 2017Co-Authors: Shiwei Zhang, Feng Hao, Haimu Chen, Wei Yuan, Yong Tang, Xi ChenAbstract:Abstract Phase change from Liquid to vapor of the working fluid has been widely used in thermal control for microelectronic devices. In this study, the effects of nanochannels on the explosive phase transition of ultrathin Liquid Argon film on the copper substrate in confined space are investigated through molecular dynamics simulation. The results show that nanochannels significantly facilitate the thermal energy transfer from solid copper surface to the Liquid Argon which leads to a much more violent explosive boiling than the plain surface. Liquid Argon atoms adjacent to the solid surface are instantly overheated and consequently a cluster of Liquid Argon detaches from the surface once the explosive boiling occurs. The temperature of the Liquid Argon when it separates from the solid surface increases with respect to the increasing nanochannel heights, while the time for the system to reach equilibrium decreases distinctly. Furthermore, though continuous heat transfers to the Liquid Argon, a non-vaporized layer always exists near the bottom surface of the solid copper base with a stable number density of about 0.025 1/A3.
G. Fiorillo - One of the best experts on this subject based on the ideXlab platform.
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Measurement of the Liquid Argon energy response to nuclear and electronic recoils
Physical Review D, 2018Co-Authors: P. Agnes, C. Galbiati, G. Fiorillo, J. V. Dawson, S. De Cecco, A. Fan, D. Franco, C. Giganti, T. N. Johnson, G. KorgaAbstract:A Liquid Argon time projection chamber, constructed for the Argon Response to Ionization and Scintillation (ARIS) experiment, is exposed to the highly collimated and quasimonoenergetic LICORNE neutron beam at the Institut de Physique Nucleaire d’Orsay (IPNO) in order to study the scintillation response to nuclear and electronic recoils. An array of Liquid scintillator detectors, arranged around the apparatus, tag scattered neutrons and select nuclear recoil energies in the [7, 120] keV energy range. The relative scintillation efficiency of nuclear recoils is measured to high precision at null field, and the ion-electron recombination probability is extracted for a range of applied electric fields. Single-scattered Compton electrons, produced by gammas emitted from the deexcitation of Li*7 in coincidence with the beam pulse, along with calibration gamma sources, are used to extract the recombination probability as a function of energy and electron drift field. The ARIS results are compared with three recombination probability parametrizations (Thomas-Imel, Doke-Birks, and PARIS), allowing for the definition of a fully comprehensive model of the Liquid Argon response to nuclear and electronic recoils down to the few-keV range. The constraints provided by ARIS to the Liquid Argon response at low energy allow the reduction of systematics affecting the sensitivity of dark matter search experiments based on Liquid Argon.
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Measurement of the Liquid Argon energy response to nuclear and electronic recoils
Phys.Rev.D, 2018Co-Authors: P. Agnes, C. Galbiati, G. Fiorillo, S. De Cecco, A. Fan, D. Franco, C. Giganti, T. N. Johnson, J. Dawson, G. KorgaAbstract:A Liquid Argon time projection chamber, constructed for the Argon Response to Ionization and Scintillation (ARIS) experiment, is exposed to the highly collimated and quasimonoenergetic LICORNE neutron beam at the Institut de Physique Nucléaire d’Orsay (IPNO) in order to study the scintillation response to nuclear and electronic recoils. An array of Liquid scintillator detectors, arranged around the apparatus, tag scattered neutrons and select nuclear recoil energies in the [7, 120] keV energy range. The relative scintillation efficiency of nuclear recoils is measured to high precision at null field, and the ion-electron recombination probability is extracted for a range of applied electric fields. Single-scattered Compton electrons, produced by gammas emitted from the deexcitation of Li*7 in coincidence with the beam pulse, along with calibration gamma sources, are used to extract the recombination probability as a function of energy and electron drift field. The ARIS results are compared with three recombination probability parametrizations (Thomas-Imel, Doke-Birks, and PARIS), allowing for the definition of a fully comprehensive model of the Liquid Argon response to nuclear and electronic recoils down to the few-keV range. The constraints provided by ARIS to the Liquid Argon response at low energy allow the reduction of systematics affecting the sensitivity of dark matter search experiments based on Liquid Argon.
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Directional modulation of electron-ion pairs recombination in Liquid Argon
Journal of Instrumentation, 2017Co-Authors: Vittorio Cataudella, A. De Candia, G. De Filippis, S. Catalanotti, M. Cadeddu, Marcello Lissia, B. Rossi, C. Galbiati, G. FiorilloAbstract:Motivated by the ongoing study of a possible directional signal in Liquid Argon dark matter detectors, we introduce a new model describing the recombination of electron-ion pairs in ionizing tracks in Liquid Argon in the presence of a drift field. The emphasis is on the three-dimensional distribution of electrons and ions and on their orientation relative to that of the electric field. We successfully apply our model to describe the angular dependence of the ionization signal of protons recently reported in measurements performed by the ArgoneuT Collaboration with a Liquid Argon time projection chamber.
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Test and Comparison of Photomultiplier Tubes at Liquid Argon Temperature
Physics Procedia, 2012Co-Authors: R. Acciarri, G. Fiorillo, M. Antonello, F. Boffelli, M. Cambiaghi, N. Canci, F. Cavanna, A. G. Cocco, F. Di Pompeo, Cristiano GalbiatiAbstract:Abstract The most recent development in the field of photomultipliers operating at Liquid Argon temperature is the Hamamatsu R11065 with peak QE up to about 35% A set of these photomultipliers has been extensively tested within the R&D program of the WArP Collaboration. During these tests the Hamamatsu PMTs showed extremely good performance and a light yield around 7 phel/keVee has been achieved in a Liquid Argon detector with a photocathodic coverage of 12%. This shows that this new type of PMT is suited for experimental applications, in particular for new direct Dark Matter searches with LAr-based experiments.
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demonstration and comparison of photomultiplier tubes at Liquid Argon temperature
Journal of Instrumentation, 2012Co-Authors: R. Acciarri, M. Antonello, F. Boffelli, M. Cambiaghi, N. Canci, F. Cavanna, A. G. Cocco, F. Di Pompeo, N Deniskina, G. FiorilloAbstract:Liquified noble gases are widely used as a target in direct Dark Matter searches. Signals from scintillation in the Liquid, following energy deposition from the recoil nuclei scattered by Dark Matter particles (e.g. WIMPs), should be recorded down to very low energies by photosensors suitably designed to operate at cryogenic temperatures. Liquid Argon based detectors for Dark Matter searches currently implement photomultiplier tubes for signal read-out. In the last few years PMTs with photocathodes operating down to Liquid Argon temperatures (87 K) have been specially developed with increasing Quantum Efficiency characteristics. The most recent of these, Hamamatsu Photonics K.K. Mod. R11065 with peak QE up to about 35%, has been extensively tested within the R&D program of the WArP Collaboration. During these tests the Hamamatsu PMTs showed excellent performance and allowed obtaining a light yield around 7 phel/keVee in a Liquid Argon detector with a photocathodic coverage in the 12% range, sufficient for detection of events down to few keVee of energy deposition. This shows that this new type of PMT is suited for experimental applications, in particular for new direct Dark Matter searches with LAr-based experiments.
Guangtian Zou - One of the best experts on this subject based on the ideXlab platform.
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Brillouin scattering studies of Liquid Argon at high temperatures and high pressures.
The Journal of chemical physics, 2008Co-Authors: Ru Jia, Qiliang Cui, Liancheng Wang, Qiang Zhou, Tian Cui, Guangtian ZouAbstract:Brillouin scattering measurements were performed on Liquid Argon in a diamond anvil cell at various solidification points up to 503 K. With the measured results from the 60 degree platelet- and 180 degree back-scattering geometries, the sound velocity, refractive index, experimental equation of state, and adiabatic bulk modulus of Liquid Argon as a function of pressure were determined. The discrepancy between experimental and previous calculated equation of state indicates that the many-body contribution to the density of Liquid Argon increases with increasing pressure and decreases with increasing temperature. By analyzing the Brillouin spectra in the coexistence of Liquid and solid phase regions, the volume change and latent heat of solid-Liquid transformation along the equilibrium curve have been also obtained for the first time.
Shiwei Zhang - One of the best experts on this subject based on the ideXlab platform.
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molecular dynamics simulation on explosive boiling of Liquid Argon film on copper nanochannels
Applied Thermal Engineering, 2017Co-Authors: Shiwei Zhang, Feng Hao, Haimu Chen, Wei Yuan, Yong Tang, Xi ChenAbstract:Abstract Phase change from Liquid to vapor of the working fluid has been widely used in thermal control for microelectronic devices. In this study, the effects of nanochannels on the explosive phase transition of ultrathin Liquid Argon film on the copper substrate in confined space are investigated through molecular dynamics simulation. The results show that nanochannels significantly facilitate the thermal energy transfer from solid copper surface to the Liquid Argon which leads to a much more violent explosive boiling than the plain surface. Liquid Argon atoms adjacent to the solid surface are instantly overheated and consequently a cluster of Liquid Argon detaches from the surface once the explosive boiling occurs. The temperature of the Liquid Argon when it separates from the solid surface increases with respect to the increasing nanochannel heights, while the time for the system to reach equilibrium decreases distinctly. Furthermore, though continuous heat transfers to the Liquid Argon, a non-vaporized layer always exists near the bottom surface of the solid copper base with a stable number density of about 0.025 1/A3.
G. Korga - One of the best experts on this subject based on the ideXlab platform.
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Measurement of the Liquid Argon energy response to nuclear and electronic recoils
Physical Review D, 2018Co-Authors: P. Agnes, C. Galbiati, G. Fiorillo, J. V. Dawson, S. De Cecco, A. Fan, D. Franco, C. Giganti, T. N. Johnson, G. KorgaAbstract:A Liquid Argon time projection chamber, constructed for the Argon Response to Ionization and Scintillation (ARIS) experiment, is exposed to the highly collimated and quasimonoenergetic LICORNE neutron beam at the Institut de Physique Nucleaire d’Orsay (IPNO) in order to study the scintillation response to nuclear and electronic recoils. An array of Liquid scintillator detectors, arranged around the apparatus, tag scattered neutrons and select nuclear recoil energies in the [7, 120] keV energy range. The relative scintillation efficiency of nuclear recoils is measured to high precision at null field, and the ion-electron recombination probability is extracted for a range of applied electric fields. Single-scattered Compton electrons, produced by gammas emitted from the deexcitation of Li*7 in coincidence with the beam pulse, along with calibration gamma sources, are used to extract the recombination probability as a function of energy and electron drift field. The ARIS results are compared with three recombination probability parametrizations (Thomas-Imel, Doke-Birks, and PARIS), allowing for the definition of a fully comprehensive model of the Liquid Argon response to nuclear and electronic recoils down to the few-keV range. The constraints provided by ARIS to the Liquid Argon response at low energy allow the reduction of systematics affecting the sensitivity of dark matter search experiments based on Liquid Argon.
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Measurement of the Liquid Argon energy response to nuclear and electronic recoils
Phys.Rev.D, 2018Co-Authors: P. Agnes, C. Galbiati, G. Fiorillo, S. De Cecco, A. Fan, D. Franco, C. Giganti, T. N. Johnson, J. Dawson, G. KorgaAbstract:A Liquid Argon time projection chamber, constructed for the Argon Response to Ionization and Scintillation (ARIS) experiment, is exposed to the highly collimated and quasimonoenergetic LICORNE neutron beam at the Institut de Physique Nucléaire d’Orsay (IPNO) in order to study the scintillation response to nuclear and electronic recoils. An array of Liquid scintillator detectors, arranged around the apparatus, tag scattered neutrons and select nuclear recoil energies in the [7, 120] keV energy range. The relative scintillation efficiency of nuclear recoils is measured to high precision at null field, and the ion-electron recombination probability is extracted for a range of applied electric fields. Single-scattered Compton electrons, produced by gammas emitted from the deexcitation of Li*7 in coincidence with the beam pulse, along with calibration gamma sources, are used to extract the recombination probability as a function of energy and electron drift field. The ARIS results are compared with three recombination probability parametrizations (Thomas-Imel, Doke-Birks, and PARIS), allowing for the definition of a fully comprehensive model of the Liquid Argon response to nuclear and electronic recoils down to the few-keV range. The constraints provided by ARIS to the Liquid Argon response at low energy allow the reduction of systematics affecting the sensitivity of dark matter search experiments based on Liquid Argon.