S. Sinyatkin

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Papers by S. Sinyatkin

Use of the methods of accelerator physics in precision measurements of particle masses at the VEPP-4 complex with the KEDR detector

Instruments and Experimental Techniques, 2010

Based on precision measurements of the beam energy using the resonant depolarization and Compton ... more Based on precision measurements of the beam energy using the resonant depolarization and Compton backscattering methods, it is possible to conduct high precision experiments in the field of high energy physics at the VEPP 4M electron-positron collider with the KEDR detector. The J/ψ and ψ(2s) meson masses measured at the VEPP 4M collider are among the ten most precisely known masses of elementary particles measured over the whole physical history. The degree of accuracy that we attained in determining the τ lepton mass by the threshold behavior of the e + eτ + τreaction cross section is the best in the world. Systems automatically controlling the temperature of the distillate that cools the magnets of the main accelerating structure and the RF accelerating cavities of the VEPP 4M collider have been devel oped, produced, and placed in operation in order to increase the efficiency of the complex. Simultaneous measurements of the transverse displacement and the angle of inclination of the beam near the interaction point can be taken with the aid of a multipinhole X ray camera.

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Fast magnetic injection and extraction kickers for NSLS-II booster synchrotron

Instruments and Experimental Techniques, 2015

ABSTRACT Nanosecond non-vacuum ferrite kickers have been developed by the Budker Institute of Nuc... more ABSTRACT Nanosecond non-vacuum ferrite kickers have been developed by the Budker Institute of Nuclear Physics to implement single-turn injection and extraction from the NSLS-II booster synchrotron (Brookhaven National Laboratory (BNL), United States). The kickers have short pulsed magnetic field fronts of ∼150 ns and a flat-top duration of 300 ns at an instability as high as 0.2%. The design of the kicker magnets comprising ceramic vacuum chambers with longitudinal titanium nitride strips deposited inside them is described. Results of bench tests of the kickers are presented: oscillograms of the current pulse in bus bars, the waveform of the pulsed magnetic field, and transverse distribution of the longitudinal field integral in the kicker aperture.

A Project for synchrotron with electron cooling for cancer therapy

Physics of Particles and Nuclei Letters, 2012

ABSTRACT A project for a new generation of proton and ion accelerator facilities for cancer thera... more ABSTRACT A project for a new generation of proton and ion accelerator facilities for cancer therapy has been developed at the Budker Institute of Nuclear Physics (BINP), Siberian Branch, Russian Academy of Sciences (SB RAS). This facility includes an electrostatic injector, a booster with a 10-Hz repetition rate, and a main synchrotron with electron cooling and beam transport lines for delivering the beam to treatment rooms. The application of electron cooling makes it possible to increase the beam intensity and reduce the apertures of both the synchrotron and the high-energy transport lines, as well as save construction costs and energy consumption as required by the accelerator complex. This paper describes the main features of the synchrotron and the requirements for its main systems and their parameters.

The magnets of the metrology light source in Berlin-Adlershof

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007

The German National Metrology Institute (PTB) in close cooperation with BESSY II (Berlin) is curr... more The German National Metrology Institute (PTB) in close cooperation with BESSY II (Berlin) is currently carrying out the construction the low-energy “Metrology Light Source” (MLS). Constructions of the MLS facility are in progress and nearly finished [1]. The user operation is scheduled to begin of 2008.Dedicated to metrology and technology development in the UV and EUV spectral range the MLS will close the gap that is existent since the shutdown of BESSY I [2].A 100MeV microtron will provide the electrons for the MLS. The MLS magnetic ring with a circumference of 48m consists of eight bending magnets, 24 quadrupole magnets, 24 sextupole magnets and four octuple magnets, and has two long and two short straight sections. The MLS magnets have been produced by the Budker Institute for Nuclear Physics, Novosibirsk, Russia [3,4]. The electron energy is ramped to the desired value between 200 and 600MeV. The expected lifetime for electron energy between 200 and 600MeV at maximum beam current of 200mA is between 1 and 10h, respectively.

Final Focus Quadrupole for the Crab-Waist Tau-Charm Factory

In the crab-waist colliders design of the final focus region is a matter of primary importance. T... more

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$Research paper thumbnail of Measurement of $J/\psi\to\gamma\eta_{\rm c}$ decay rate and $\eta_{\rm c}$ parameters at KEDR$

Measurement of $J/\psi\to\gamma\eta_{\rm c}$ decay rate and $\eta_{\rm c}$ parameters at KEDR

by S. Sinyatkin, Andrey Yushkov, and I. Bedny

Using the inclusive photon spectrum based on a data sample collected at the $J/\psi$ peak with th... more Using the inclusive photon spectrum based on a data sample collected at the $J/\psi$ peak with the KEDR detector at the VEPP-4M $e^+e^-$ collider, we measured the rate of the radiative decay $J/\psi\to\gamma\eta_{\rm c}$ as well as $\eta_{\rm c}$ mass and width. Taking into account an asymmetric photon lineshape we obtained: $\Gamma^0_{\gamma\eta_{\rm c}}=2.98\pm0.18 \phantom{|}^{+0.15}_{-0.33}$ keV, $M_{\eta_{\rm c}} = 2983.5 \pm 1.4 \phantom{|}^{+1.6}_{-3.6}$ MeV/$c^2$, $\Gamma_{\eta_{\rm c}} = 27.2 \pm 3.1 \phantom{|}^{+5.4}_{-2.6}$ MeV.

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Search for narrow resonances in e + e − annihilation between 1.85 and 3.1 GeV with the KEDR detector

by S. Sinyatkin, V. Kudryavtsev, and Sergey Karnaev

Physics Letters B, 2011

We report results of a search for narrow resonances in e+e− annihilation at center-of-mass energi... more We report results of a search for narrow resonances in e+e− annihilation at center-of-mass energies between 1.85 and 3.1 GeV performed with the KEDR detector at the VEPP-4M e+e− collider. The upper limit on the leptonic width of a narrow resonance ΓeeR⋅Br(R→hadr)120 eV has been obtained (at 90% C.L.).

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Bending magnets for the SAGA Storage Ring

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2005

ABSTRACT The dipole bending magnets (BM) for SR Source Storage Ring (prefecture SAGA, Japan) were... more ABSTRACT The dipole bending magnets (BM) for SR Source Storage Ring (prefecture SAGA, Japan) were designed, manufactured and measured by the Budker INP, Novosibirsk, Russia. The main features of magnetic modeling and magnetic measurements are presented in the paper. The measured basic parameters of the manufactured bending magnets have good agreement with the model simulation.

Bending Magnets for the Saga Storage Ring: Manufacturing and Magnetic Measurements

The creation of BM with that large good field area is complicated due to necessity to combine it ... more The creation of BM with that large good field area is complicated due to necessity to combine it with small transverse dimensions of BM, indicated in Fig.1. Before a serial production the prototype (BM00) of the bending magnet was designed, manufactured and measured by the Budker INP and in KHI, Japan. On the basis of this prototype the 16 serial

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Parameters of Charmonium States from Kedr

by S. Sinyatkin and V. Kudryavtsev

International Journal of Modern Physics: Conference Series, 2014

Study of Ψ(2S) → Μ + Μ - Decay with Kedr Detector

by S. Sinyatkin and V. Kudryavtsev

International Journal of Modern Physics: Conference Series, 2014

Recent SuperB Design Choices Improve Next-Generation e e___ B-Factory Collider

by S. Sinyatkin and S. Nikitin

Status of the SuperB factory Design

by S. Sinyatkin and S. Nikitin

The SuperB international team continues to optimize the design of an electron-positron collider, ... more The SuperB international team continues to optimize the design of an electron-positron collider, which will allow the enhanced study of the origins of flavor physics. The project combines the best features of a linear collider (high single-collision luminosity) and a storage-ring collider (high repetition rate), bringing together all accelerator physics aspects to make a very high luminosity of 10Â³â¶ cmâ»Â² secâ»Â¹. This asymmetric-energy collider with a polarized electron beam will produce hundreds of millions of B-mesons at the Y(4S) resonance. The present design is based on extremely low emittance beams colliding at a large Piwinski angle to allow very low Î²{sub y} without the need for ultra short bunches. Use of crab-waist sextupoles will enhance the luminosity, suppressing dangerous resonances and allowing for a higher beam-beam parameter. The project has flexible beam parameters, improved dynamic aperture, and spin-rotators in the Low Energy Ring for longitudinal polariza...

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Project of a Super Charm-Tau factory at the Budker Institute of Nuclear Physics in Novosibirsk

by S. Sinyatkin, A. Zhemchugov, A. Petrenko, V. Kudryavtsev, K. Zolotarev, Andrey Yushkov, and S. Nikitin

Physics of Atomic Nuclei, 2013

A project of a Super Charm-Tau factory is being developed at the Budker Institute of Nuclear Phys... more A project of a Super Charm-Tau factory is being developed at the Budker Institute of Nuclear Physics (Siberian Branch, Russian Academy of Sciences) in Novosibirsk. The electron-positron collider to be employed will operate at c.m. energies in the range between 2 and 5 GeV at an unprecedentedly high luminosity of 10 35 cm −2 s −1 with a longitudinal electron polarization at the beam-interaction point. The main objective of experiments at the Super Charm-Tau factory is to study processes involving the production and properties of charmed quarks and tau leptons. A high luminosity of this setup will make it possible to obtain a statistical data sample that will be three to four orders of magnitude vaster than that from any other experiment performed thus far. Experiments at this setup are assumed to be sensitive to effects of new physics beyond the Standard Model. Investigations to be carried out at the Super-Charm-Tau factory will supplement future experiments at Super-B factories under construction in Italy and in Japan. high-energy-physics studies. All of these setups were designed to a beam energy of 1 to 3 GeV and a peak luminosity of about 10 33 cm −2 s −1 [1-7]. Moreover, a project based on an electron-positron collider with cylindrical beams and rated to a luminosity of 10 34 cm −2 s −1 was developed in Novosi-

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Measurement of and meson masses with the KEDR detector

by S. Sinyatkin, Andrey Yushkov, and I. Bedny

Physics Letters B, 2010

The masses of the neutral and charged D mesons have been measured with the KEDR detector at the V... more The masses of the neutral and charged D mesons have been measured with the KEDR detector at the VEPP-4M electron-positron collider: M D 0 = 1865.30 ± 0.33 ± 0.23 MeV, M D + = 1869.53 ± 0.49 ± 0.20 MeV. address: A.O.Poluektov@inp.nsk.su (A.O. Poluektov). according to some models, is a bound state of D 0 and D * 0 mesons [5] and has a mass very close to the sum of the D 0 and D * 0 meson masses. Presently, the world-average D 0 mass value [6] (M D 0 = 1864.84 ± 0.17 MeV) is dominated by the CLEO measurement M D 0 = 1864.847 ± 0.150(stat) ± 0.095(syst) MeV [7]

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Tau mass measurement at KEDR

by S. Sinyatkin, Andrey Yushkov, and I. Bedny

Nuclear Physics B - Proceedings Supplements, 2008

The status of the experiment on the precise τ lepton mass measurement running at the VEPP-4M coll... more The status of the experiment on the precise τ lepton mass measurement running at the VEPP-4M collider with the KEDR detector is reported. The mass value is evaluated from the τ + τ − cross section behavior around the production threshold. The preliminary result based on 15.2 pb −1 of data is mτ = 1776.69 +0.17 −0.19 ± 0.15 MeV.

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New precise determination of the τ lepton mass at KEDR detector

by S. Sinyatkin, Andrey Yushkov, and I. Bedny

Nuclear Physics B - Proceedings Supplements, 2007

The status of the experiment on the precise τ lepton mass measurement running at the VEPP-4M coll... more The status of the experiment on the precise τ lepton mass measurement running at the VEPP-4M collider with the KEDR detector is reported. The mass value is evaluated from the τ + τ − cross section behaviour around the production threshold. The preliminary result based on 6.7 pb −1 of data is mτ = 1776.80 +0.25 −0.23 ± 0.15 MeV. Using 0.8 pb −1 of data collected at the ψ ′ peak the preliminary result is also obtained: Γee ·Bττ (ψ ′ ) = 7.2 ± 2.1 eV.

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τ lepton mass determination at KEDR

by S. Sinyatkin, Andrey Yushkov, and I. Bedny

Nuclear Physics B - Proceedings Supplements, 2011

We present preliminary results of a new high-precision determination of the tau lepton mass perfo... more

Lattice Study for the Carbon Ion Synchrotron for Cancer Therapy with Electron Cooling

In this paper the preliminary design of magnet lattice of the Carbon Ion Therapy Facility with el... more In this paper the preliminary design of magnet lattice of the Carbon Ion Therapy Facility with electron cooling is described. The influence of misalignments of magnetic elements on ring parameters and the layout of the orbit correction are estimated. The different methods of ion extractions from the synchrotron are considered including the pellet extraction, recombination extraction and the extraction on the sextupole resonance.

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Experiments on the physics of charged particle beams at the VEPP-4M electron-positron collider

Journal of Experimental and Theoretical Physics, 2009

The VEPP 4M accelerator facility with a universal KEDR detector is designed to conduct exper imen... more The VEPP 4M accelerator facility with a universal KEDR detector is designed to conduct exper iments with colliding electron-positron beams. High energy physics, nuclear physics, and studies using syn chrotron radiation are the main directions of research with this facility. In addition, experiments on poorly explored issues in the physics of beams in the electron-positron storage ring and methodological studies to prepare an experiment aimed at testing corollaries of the CPT theorem for an electron and a positron are reg ularly conducted at the VEPP 4 facility. A number of works performed in recent years are described: studies to increase the accuracy of comparing the electron and positron spin precession frequencies by the resonant depolarization method; measurements of the count rate of Touschek electrons as a function of the beam energy in a wide range; comparison of the methods for measuring the beam energy spread; a study of the elec tron beam dynamics when a nonlinear betatron resonance is crossed.

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