The Experts below are selected from a list of 181686 Experts worldwide ranked by ideXlab platform
Tomohiko Tanabe - One of the best experts on this subject based on the ideXlab platform.
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Full Simulation study of the top Yukawa coupling at the ILC at \sqrt{s}=1 TeV
The European Physical Journal C, 2015Co-Authors: Tony Price, Philipp Roloff, Jan Strube, Tomohiko TanabeAbstract:We present a study of the expected precision for the measurement of the top Yukawa coupling, \(y_{\mathrm {t}}\), in \(\mathrm{e}^{+}\mathrm{e}^{-} \) collisions at a center-of-mass energy of 1 TeV. Independent analyses of \(\mathrm{t}\bar{\mathrm{t}}\mathrm{H}\) final states containing at least six hadronic jets are performed, based on detailed Simulations of SiD and ILD, the two candidate detector concepts for the ILC. We estimate that a statistical precision on \(y_{\mathrm {t}}\) of 4.5 % can be obtained with an integrated luminosity of 1 \(\mathrm {ab}^{-1} \) that is split equally between two configurations for the beam polarization \(P({{\mathrm{e}}}^{-},{{\mathrm{e}}}^{+})\), \((-80~\%,+20~\%)\) and \((+80~\%,-20~\%)\). This estimate improves to \(4~\%\) if the 1 \(\mathrm {ab}^{-1} \) sample is assumed to be Fully in the \(P({{\mathrm{e}}}^{-},{{\mathrm{e}}}^{+}) = (-80~\%,+20~\%)\) configuration.
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Measuring BR($h \to \tau ^+ \tau ^-$) at the ILC: a Full Simulation study
arXiv: High Energy Physics - Experiment, 2015Co-Authors: Shin Ichi Kawada, K Fujii, Taikan Suehara, Tohru Takahashi, Tomohiko Tanabe, Harumichi YokoyamaAbstract:We evaluate the expected measurement accuracy of the branching ratio of the Standard Model Higgs boson decaying into tau pairs at the ILC with a Full Simulation of the ILD detector concept. We assume a Higgs mass of 125 GeV, a branching ratio of BR($h \to \tau ^+ \tau ^-$) = 6.32%, a beam polarization of electron (positron) of -0.8(+0.3), and an integrated luminosity of 250 fb$^{-1}$. The Higgs-strahlung process $e^+ e^- \to Zh$ with $Z \to q\overline{q}$ is analyzed. We estimate the measurement accuracy of the branching ratio $\Delta (\sigma \times \mathrm{BR}) / (\sigma \times \mathrm{BR})$ to be 3.4% with using a multivariate analysis technique.
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Full Simulation study of the higgs branching ratio into tau lepton pairs at the ilc with sqrt s 500 gev
arXiv: High Energy Physics - Experiment, 2014Co-Authors: Shin Ichi Kawada, K Fujii, Taikan Suehara, Tohru Takahashi, Tomohiko TanabeAbstract:We evaluate the expected measurement accuracy of the branching ratio of the Standard Model Higgs boson decaying into tau lepton pairs $h \to \tau ^+ \tau ^-$ at the ILC with a center-of-mass energy of $\sqrt{s} = 500$ GeV with a Full Simulation of the ILD detector. We assume a Higgs mass of $M_h = 125$ GeV, a branching ratio of $\mathrm{BR}(h \to \tau ^+ \tau ^-) = 6.32 \%$, beam polarizations of $P(e^+, e^-) = (-0.8,+0.3)$, and an integrated luminosity of $\int L dt = 500 \mathrm{fb^{-1}}$. The Higgs-strahlung process $e^+ e^- \to Zh$ with $Z \to q \overline{q}$ and the $WW$-fusion process $e^+ e^- \to \nu \overline{\nu} h$ are expected to be the most sensitive channels at $\sqrt{s} = 500$ GeV. Using a multivariate analysis technique, we estimate the expected relative measurement accuracy of the branching ratio $\Delta(\sigma \cdot \mathrm{BR}) / (\sigma \cdot \mathrm{BR})$ to be 4.7% and 7.4% for the $q \overline{q} h$ and $\nu \overline{\nu} h$ final states, respectively. The results are cross-checked using a cut-based analysis.
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Full Simulation Study of the Higgs Branching Ratio into Tau Lepton Pairs at the ILC with $\sqrt{s} = 500$ GeV
arXiv: High Energy Physics - Experiment, 2014Co-Authors: Shin Ichi Kawada, K Fujii, Taikan Suehara, Tohru Takahashi, Tomohiko TanabeAbstract:We evaluate the expected measurement accuracy of the branching ratio of the Standard Model Higgs boson decaying into tau lepton pairs $h \to \tau ^+ \tau ^-$ at the ILC with a center-of-mass energy of $\sqrt{s} = 500$ GeV with a Full Simulation of the ILD detector. We assume a Higgs mass of $M_h = 125$ GeV, a branching ratio of $\mathrm{BR}(h \to \tau ^+ \tau ^-) = 6.32 \%$, beam polarizations of $P(e^+, e^-) = (-0.8,+0.3)$, and an integrated luminosity of $\int L dt = 500 \mathrm{fb^{-1}}$. The Higgs-strahlung process $e^+ e^- \to Zh$ with $Z \to q \overline{q}$ and the $WW$-fusion process $e^+ e^- \to \nu \overline{\nu} h$ are expected to be the most sensitive channels at $\sqrt{s} = 500$ GeV. Using a multivariate analysis technique, we estimate the expected relative measurement accuracy of the branching ratio $\Delta(\sigma \cdot \mathrm{BR}) / (\sigma \cdot \mathrm{BR})$ to be 4.7% and 7.4% for the $q \overline{q} h$ and $\nu \overline{\nu} h$ final states, respectively. The results are cross-checked using a cut-based analysis.
Riccardo Amirante - One of the best experts on this subject based on the ideXlab platform.
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A Novel Servovalve Pilot Stage Actuated by a Piezo-Electric Ring Bender (Part II): Design Model and Full Simulation
Energies, 2020Co-Authors: Paolo Tamburrano, Elia Distaso, Andrew Plummer, Pietro De Palma, Riccardo AmiranteAbstract:In part I of this study, we experimentally and numerically investigated the pilot stage of a novel two-stage servovalve architecture. The novelty of the proposed configuration is the torque motor being removed and replaced with two small two-way two-position (2/2) valves actuated by piezoelectric ring benders, which can effectively control the opening degree of a main spool valve. With this novel architecture, the typical drawbacks of two-stage servovalves can be overcome, such as the high complexity of the torque motor and the high internal leakage in the pilot stage when the main valve is at rest in the neutral position (null). The low complexity and the negligible internal leakage of the piezo-valves are accompanied by the high response speed typical of piezoelectric actuators. The valve assessment is completed in the present study, since the entire valve architecture (main stage + pilot stage) is investigated. In particular, a simplified numerical model is developed to provide a design tool that allows, for a given main stage spool, the values of the geometrical parameters of the pilot stage to be chosen along with the characteristics of the ring bender. This design procedure is applied to a 7 mm diameter main spool; afterward, a detailed numerical model of the entire valve, solved by SimScape Fluids software, is employed to demonstrate that the response of the main stage valve is very rapid while ensuring negligible internal leakage through the piezo-valves when the main stage is closed (resulting in lower power consumption). For this reason, the proposed valve can be regarded as a “clean” component for energy conversion, having lower energy consumption than commercially available servovalves.
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Full Simulation of a piezoelectric double nozzle flapper pilot valve coupled with a main stage spool valve
Energy Procedia, 2018Co-Authors: Paolo Tamburrano, Riccardo Amirante, Elia Distaso, Andrew PlummerAbstract:Abstract This paper develops a detailed Simulation model, realized by the software Simscape, which can be a powerful tool to analyze the performance of a double nozzle flapper valve actuated by a piezoelectric ring bender. The particularity of this valve is that the use of the torque motor and flexure tube is avoided, thus reducing the complexity, manufacturing time and cost of the valve assembly. The model accounts for all the real phenomena present in the valve, such as fluid compressibility and fluid viscosity. The viability of the valve concept is validated by step tests simulated at different valve openings. It is shown that the response time obtained for a supply pressure of 210 bar and necessary to reach 90% of the maximum opening degree (corresponding to a maximum spool position of 1mm and maximum flow rate of 60 l/min) is only 6 ms, which is comparable with typical commercially available double nozzle flapper valves, but with the advantage of having removed critical components such as the torque motor and the flexure tube.
Andrew Plummer - One of the best experts on this subject based on the ideXlab platform.
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A Novel Servovalve Pilot Stage Actuated by a Piezo-Electric Ring Bender (Part II): Design Model and Full Simulation
Energies, 2020Co-Authors: Paolo Tamburrano, Elia Distaso, Andrew Plummer, Pietro De Palma, Riccardo AmiranteAbstract:In part I of this study, we experimentally and numerically investigated the pilot stage of a novel two-stage servovalve architecture. The novelty of the proposed configuration is the torque motor being removed and replaced with two small two-way two-position (2/2) valves actuated by piezoelectric ring benders, which can effectively control the opening degree of a main spool valve. With this novel architecture, the typical drawbacks of two-stage servovalves can be overcome, such as the high complexity of the torque motor and the high internal leakage in the pilot stage when the main valve is at rest in the neutral position (null). The low complexity and the negligible internal leakage of the piezo-valves are accompanied by the high response speed typical of piezoelectric actuators. The valve assessment is completed in the present study, since the entire valve architecture (main stage + pilot stage) is investigated. In particular, a simplified numerical model is developed to provide a design tool that allows, for a given main stage spool, the values of the geometrical parameters of the pilot stage to be chosen along with the characteristics of the ring bender. This design procedure is applied to a 7 mm diameter main spool; afterward, a detailed numerical model of the entire valve, solved by SimScape Fluids software, is employed to demonstrate that the response of the main stage valve is very rapid while ensuring negligible internal leakage through the piezo-valves when the main stage is closed (resulting in lower power consumption). For this reason, the proposed valve can be regarded as a “clean” component for energy conversion, having lower energy consumption than commercially available servovalves.
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Full Simulation of a piezoelectric double nozzle flapper pilot valve coupled with a main stage spool valve
Energy Procedia, 2018Co-Authors: Paolo Tamburrano, Riccardo Amirante, Elia Distaso, Andrew PlummerAbstract:Abstract This paper develops a detailed Simulation model, realized by the software Simscape, which can be a powerful tool to analyze the performance of a double nozzle flapper valve actuated by a piezoelectric ring bender. The particularity of this valve is that the use of the torque motor and flexure tube is avoided, thus reducing the complexity, manufacturing time and cost of the valve assembly. The model accounts for all the real phenomena present in the valve, such as fluid compressibility and fluid viscosity. The viability of the valve concept is validated by step tests simulated at different valve openings. It is shown that the response time obtained for a supply pressure of 210 bar and necessary to reach 90% of the maximum opening degree (corresponding to a maximum spool position of 1mm and maximum flow rate of 60 l/min) is only 6 ms, which is comparable with typical commercially available double nozzle flapper valves, but with the advantage of having removed critical components such as the torque motor and the flexure tube.
Paolo Tamburrano - One of the best experts on this subject based on the ideXlab platform.
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A Novel Servovalve Pilot Stage Actuated by a Piezo-Electric Ring Bender (Part II): Design Model and Full Simulation
Energies, 2020Co-Authors: Paolo Tamburrano, Elia Distaso, Andrew Plummer, Pietro De Palma, Riccardo AmiranteAbstract:In part I of this study, we experimentally and numerically investigated the pilot stage of a novel two-stage servovalve architecture. The novelty of the proposed configuration is the torque motor being removed and replaced with two small two-way two-position (2/2) valves actuated by piezoelectric ring benders, which can effectively control the opening degree of a main spool valve. With this novel architecture, the typical drawbacks of two-stage servovalves can be overcome, such as the high complexity of the torque motor and the high internal leakage in the pilot stage when the main valve is at rest in the neutral position (null). The low complexity and the negligible internal leakage of the piezo-valves are accompanied by the high response speed typical of piezoelectric actuators. The valve assessment is completed in the present study, since the entire valve architecture (main stage + pilot stage) is investigated. In particular, a simplified numerical model is developed to provide a design tool that allows, for a given main stage spool, the values of the geometrical parameters of the pilot stage to be chosen along with the characteristics of the ring bender. This design procedure is applied to a 7 mm diameter main spool; afterward, a detailed numerical model of the entire valve, solved by SimScape Fluids software, is employed to demonstrate that the response of the main stage valve is very rapid while ensuring negligible internal leakage through the piezo-valves when the main stage is closed (resulting in lower power consumption). For this reason, the proposed valve can be regarded as a “clean” component for energy conversion, having lower energy consumption than commercially available servovalves.
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Full Simulation of a piezoelectric double nozzle flapper pilot valve coupled with a main stage spool valve
Energy Procedia, 2018Co-Authors: Paolo Tamburrano, Riccardo Amirante, Elia Distaso, Andrew PlummerAbstract:Abstract This paper develops a detailed Simulation model, realized by the software Simscape, which can be a powerful tool to analyze the performance of a double nozzle flapper valve actuated by a piezoelectric ring bender. The particularity of this valve is that the use of the torque motor and flexure tube is avoided, thus reducing the complexity, manufacturing time and cost of the valve assembly. The model accounts for all the real phenomena present in the valve, such as fluid compressibility and fluid viscosity. The viability of the valve concept is validated by step tests simulated at different valve openings. It is shown that the response time obtained for a supply pressure of 210 bar and necessary to reach 90% of the maximum opening degree (corresponding to a maximum spool position of 1mm and maximum flow rate of 60 l/min) is only 6 ms, which is comparable with typical commercially available double nozzle flapper valves, but with the advantage of having removed critical components such as the torque motor and the flexure tube.
Elia Distaso - One of the best experts on this subject based on the ideXlab platform.
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A Novel Servovalve Pilot Stage Actuated by a Piezo-Electric Ring Bender (Part II): Design Model and Full Simulation
Energies, 2020Co-Authors: Paolo Tamburrano, Elia Distaso, Andrew Plummer, Pietro De Palma, Riccardo AmiranteAbstract:In part I of this study, we experimentally and numerically investigated the pilot stage of a novel two-stage servovalve architecture. The novelty of the proposed configuration is the torque motor being removed and replaced with two small two-way two-position (2/2) valves actuated by piezoelectric ring benders, which can effectively control the opening degree of a main spool valve. With this novel architecture, the typical drawbacks of two-stage servovalves can be overcome, such as the high complexity of the torque motor and the high internal leakage in the pilot stage when the main valve is at rest in the neutral position (null). The low complexity and the negligible internal leakage of the piezo-valves are accompanied by the high response speed typical of piezoelectric actuators. The valve assessment is completed in the present study, since the entire valve architecture (main stage + pilot stage) is investigated. In particular, a simplified numerical model is developed to provide a design tool that allows, for a given main stage spool, the values of the geometrical parameters of the pilot stage to be chosen along with the characteristics of the ring bender. This design procedure is applied to a 7 mm diameter main spool; afterward, a detailed numerical model of the entire valve, solved by SimScape Fluids software, is employed to demonstrate that the response of the main stage valve is very rapid while ensuring negligible internal leakage through the piezo-valves when the main stage is closed (resulting in lower power consumption). For this reason, the proposed valve can be regarded as a “clean” component for energy conversion, having lower energy consumption than commercially available servovalves.
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Full Simulation of a piezoelectric double nozzle flapper pilot valve coupled with a main stage spool valve
Energy Procedia, 2018Co-Authors: Paolo Tamburrano, Riccardo Amirante, Elia Distaso, Andrew PlummerAbstract:Abstract This paper develops a detailed Simulation model, realized by the software Simscape, which can be a powerful tool to analyze the performance of a double nozzle flapper valve actuated by a piezoelectric ring bender. The particularity of this valve is that the use of the torque motor and flexure tube is avoided, thus reducing the complexity, manufacturing time and cost of the valve assembly. The model accounts for all the real phenomena present in the valve, such as fluid compressibility and fluid viscosity. The viability of the valve concept is validated by step tests simulated at different valve openings. It is shown that the response time obtained for a supply pressure of 210 bar and necessary to reach 90% of the maximum opening degree (corresponding to a maximum spool position of 1mm and maximum flow rate of 60 l/min) is only 6 ms, which is comparable with typical commercially available double nozzle flapper valves, but with the advantage of having removed critical components such as the torque motor and the flexure tube.
