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P Sorensen - One of the best experts on this subject based on the ideXlab platform.

  • Beam Energy Scan Results from RHIC
    Journal of Physics: Conference Series, 2013
    Co-Authors: P Sorensen
    Abstract:

    In 2010 and 2011, RHIC ran the first phase of a planned Beam Energy scan program to probe, among other things, the nature of the phase transition between hadrons and Quark Gluon Plasma as the matter vs anti-matter excess increases. Many experimental findings are now available from that scan. In this talk, I discuss the meaning of those results and the future plans and motivation for the second phase of the RHIC Beam Energy scan.

  • Interpreting near-side correlations and the RHIC Beam Energy scan
    The European Physical Journal C, 2009
    Co-Authors: P Sorensen
    Abstract:

    Recent data from heavy ion collisions at RHIC show strong near-side correlations extending over several units of rapidity. This ridge-like correlation exhibits an abrupt onset with collision centrality. In this talk, I argue that the centrality and Beam-Energy dependence of these near-angle correlations could provide access to information about the Quark Gluon Plasma phase boundary and the Equation of State of nuclear matter. A Beam-Energy-scan at RHIC will better reveal the true source of these correlations and should be a high priority at RHIC.

J T Mitchell - One of the best experts on this subject based on the ideXlab platform.

  • the rhic Beam Energy scan program results from the phenix experiment
    Nuclear Physics, 2013
    Co-Authors: J T Mitchell
    Abstract:

    Abstract The PHENIX Experiment at RHIC has conducted a Beam Energy scan at several collision energies in order to search for signatures of the QCD critical point and the onset of deconfinement. PHENIX has conducted measurements of transverse Energy production, muliplicity fluctuations, and the skewness and kurtosis of net charge distributions. The data analyzed to date show no significant indications of the presence of the critical point.

N. Yu. Muchnoi - One of the best experts on this subject based on the ideXlab platform.

  • Laser backscattering for Beam Energy calibration in collider experiments
    Journal of Instrumentation, 2017
    Co-Authors: M. N. Achasov, N. Yu. Muchnoi
    Abstract:

    Laser backscattering was implemented as a tool for accurate Beam Energy measurement at three of the five existing electron-positron colliders. The present report summarizes the experience obtained during these experiments.

  • Fast and Precise Beam Energy Measurement using Compton Backscattering at e+e- Colliders
    2017
    Co-Authors: V.v. Kaminskiy, N. Yu. Muchnoi, V. N. Zhilich, M. N. Achasov
    Abstract:

    The report describes a method for a fast and precise Beam Energy measurement in the Beam Energy range 0.5-2 GeV and its application at various e+e- colliders. Low-Energy laser photons interact head-on with the electron or positron Beam and produce Compton backscattered photons whose Energy is precisely measured by HPGe detector. The method allows measuring the Beam Energy with relative accuracy of ∼2-5.10 -5 . The method was successfully applied at VEPP-4M, VEPP-3, VEPP-2000 (BINP, Russia) and BEPC-II (IHEP, China).

  • Measurement of the ripple of magnet power supply and its effect to the Beam Energy
    Radiation Detection Technology and Methods, 2017
    Co-Authors: Jian-yong Zhang, Xiao Cai, Guang-yi Tang, Wei Shujun, Feng-li Long, M. N. Achasov, Bin Chen, N. Yu. Muchnoi
    Abstract:

    This study is aimed at measuring the ripple of magnetic power supply of BEPCII and checking its effect to Beam Energy. A sensor made of printed circuit board coils is designed and manufactured. The sensor was inserted into a good area region of the magnetic field with the surface perpendicular to the field force lines. The change of the magnetic field would be detected according to Faraday’s law. The experiment result indicates that the time-dependent ripple of the magnetic field is in the magnitude of ppm. Such a small effect of the time-dependent ripplecan be negligibleto Beam Energy.

  • Upgrade of Beam Energy measurement system at BEPC-II
    Chinese Physics C, 2016
    Co-Authors: Jian-yong Zhang, Xiao Cai, M. N. Achasov, N. Yu. Muchnoi, A.a. Krasnov, Di-zhou Guo, Jian-li Wang, B. J. Liu, E. E. Pyata
    Abstract:

    The Beam Energy measurement system is of great importance for both BEPC-II accelerator and BES-III detector. The system is based on measuring the energies of Compton back-scattered photons. In order to meet the requirements of data taking and improve the measurement accuracy, the system has continued to be upgraded, which involves the updating of laser and optics subsystems, replacement of a view-port of the laser to the vacuum insertion subsystem, the use of an electric cooling system for a high purity germanium detector, and improvement of the data acquisition and processing subsystem. The upgrade system guarantees the smooth and efficient measurement of Beam Energy at BEPC-II and enables accurate offline Energy values for further physics analysis at BES-III.

  • Beam Energy determination in experiments at electron-positron colliders
    Journal of Instrumentation, 2014
    Co-Authors: M. N. Achasov, N. Yu. Muchnoi
    Abstract:

    The review of using of compton backscattering method for determination of the Beam Energy in collider experiments is given.

X Luo - One of the best experts on this subject based on the ideXlab platform.

  • Beam Energy dependence of the squeeze out effect on the directed and elliptic flow in au au collisions in the high baryon density region
    Physical Review C, 2018
    Co-Authors: Chao Zhang, X Luo, Jiamin Chen, Feng Liu, Yasushi Nara
    Abstract:

    We present a detailed analysis of the Beam Energy dependence of the mechanisms for the generation of directed and elliptic flows in Au+Au collisions focusing on the role of hadronic rescattering and spectator shadowing within a microscopic transport model JAM with different equation of state. A systematic study of the Beam Energy dependence is performed for Au+Au collisions at $\sqrt{s_{NN}} =2.3 - 62.4$ GeV. The transition of the dynamical origin of the directed flow is observed. We find that the initial Glauber type nucleon-nucleon collisions generate negative $v_1$ for nucleons at midrapidity due to the presence of spectator matter, and this negative nucleon $v_1$ is turned to be positive by the meson-baryon interactions at the Beam Energy region of $\sqrt{s_{NN}} 0.5$, which decreases as Beam Energy increases.

  • exploring the qcd phase structure with Beam Energy scan in heavy ion collisions
    Nuclear Physics, 2016
    Co-Authors: X Luo
    Abstract:

    Beam Energy scan programs in heavy-ion collisions aim to explore the QCD phase structure at high baryon density. Sensitive observables are applied to probe the signatures of the QCD phase transition and critical point in heavy-ion collisions at RHIC and SPS. Intriguing structures, such as dip, peak and oscillation, have been observed in the Energy dependence of various observables. In this paper, an overview is given and corresponding physics implications will be discussed for the experimental highlights from the Beam Energy scan programs at the STAR, PHENIX and NA61/SHINE experiments. Furthermore, the Beam Energy scan phase II at RHIC (2019–2020) and other future experimental facilities for studying the physics at low energies will be also discussed.

V. E. Blinov - One of the best experts on this subject based on the ideXlab platform.

  • Beam Energy Measurement by Resonant Depolarization Method at VEPP-4M
    2017
    Co-Authors: I. B. Nikolaev, V. E. Blinov, Vladimir Ivakin, Vyacheslav Kaminskiy, Vasily Kudryavtsev, S.a. Nikitin, Lev Shekhtman
    Abstract:

    Experiments on high precision mass measurement of particles require precise Beam Energy calibration. The most accurate method of Beam Energy measurement is the resonant depolarization technique. This article describes the Beam Energy measurement at the VEPP-4M storage ring using this method together with a Touschek polarimeter. The accuracy achieved is about 10 −6 . More than thousand Energy calibrations were used in the KEDR detector for the precise experiments on the measurement of J/ψ, ψ(2S), ψ(3770), D + , D 0 meson and τ lepton masses.

  • The Beam Energy measurement system for the Beijing electron-positron collider
    Nuclear Physics B - Proceedings Supplements, 2012
    Co-Authors: J.y. Zhang, M. N. Achasov, V. E. Blinov, E.v. Abakumova, Cai, H.y. Dong, F. A. Harris, V.v. Kaminsky, A.a. Krasnov
    Abstract:

    The Beam Energy measurement system (BEMS) for the upgraded Beijing electron-positron collider BEPC-II is described. The system is based on measuring the energies of Compton back-scattered photons. The relative systematic uncertainty of the electron and positron Beam Energy determination is estimated as 2 ⋅ 10 − 5 .

  • the Beam Energy measurement system for the beijing electron positron collider
    Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2011
    Co-Authors: E.v. Abakumova, M. N. Achasov, V. E. Blinov, H.y. Dong, F. A. Harris, V.v. Kaminsky, A.a. Krasnov, X Cai, Q Liu, Yu N Muchnoi
    Abstract:

    Abstract The Beam Energy measurement system (BEMS) for the upgraded Beijing electron–positron collider BEPC-II is described. The system is based on measuring the energies of Compton back-scattered photons. The relative systematic uncertainty of the electron and positron Beam Energy determination is estimated as 2×10−5. The relative uncertainty of the Beam's Energy spread is about 6%.

  • review of Beam Energy measurements at vepp 4m collider kedr vepp 4m
    Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2009
    Co-Authors: V. E. Blinov, I. B. Nikolaev, S.a. Nikitin, Yu N Muchnoi, A V Bogomyagkov, A G Shamov, V Zhilich
    Abstract:

    Abstract An accurate knowledge of the colliding Beam energies is essential for the current experiments with the KEDR detector at the VEPP-4M collider. Now the experimental activity is focused on the measurements of τ lepton mass and parameters of narrow resonances of the ψ -family in the c.m.Energy range of 3.0–4.0 GeV. Two complementary approaches are used for the Beam Energy measurements. The resonant spin depolarization technique (RD) provides an accuracy about 1–3 keV for the instantaneous Beam Energy value, but requires a special regime of the collider. Between calibrations the interpolation procedure is used providing the accuracy of 6–10 keV for the J / ψ , ψ ( 2 s ) and 15–30 keV for the τ lepton mass determination experiments. Another approach allows to calculate Beam Energy via the maximum Energy of backscattering laser photons. The Compton BackScattering (CBS) monitor allows continuous on-line monitoring of the Beam Energy with accuracy about 150 keV, which is critical during the τ lepton mass measurement. The statistical error for a 1 h period is about 100 keV, the present systematic error is 50–70 keV.

  • Review of Beam Energy measurements at VEPP-4M collider ☆: KEDR/VEPP-4M
    Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, 2009
    Co-Authors: V. E. Blinov, N. Yu. Muchnoi, I. B. Nikolaev, S.a. Nikitin, A V Bogomyagkov, A G Shamov, V. N. Zhilich
    Abstract:

    Abstract An accurate knowledge of the colliding Beam energies is essential for the current experiments with the KEDR detector at the VEPP-4M collider. Now the experimental activity is focused on the measurements of τ lepton mass and parameters of narrow resonances of the ψ -family in the c.m.Energy range of 3.0–4.0 GeV. Two complementary approaches are used for the Beam Energy measurements. The resonant spin depolarization technique (RD) provides an accuracy about 1–3 keV for the instantaneous Beam Energy value, but requires a special regime of the collider. Between calibrations the interpolation procedure is used providing the accuracy of 6–10 keV for the J / ψ , ψ ( 2 s ) and 15–30 keV for the τ lepton mass determination experiments. Another approach allows to calculate Beam Energy via the maximum Energy of backscattering laser photons. The Compton BackScattering (CBS) monitor allows continuous on-line monitoring of the Beam Energy with accuracy about 150 keV, which is critical during the τ lepton mass measurement. The statistical error for a 1 h period is about 100 keV, the present systematic error is 50–70 keV.