A. D. Kovalenko
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View article: Feasibility of crystal-assisted collimation in the CERN accelerator complex
Feasibility of crystal-assisted collimation in the CERN accelerator complex Open
Bent silicon crystals mounted on high-accuracy angular actuators were installed in the CERN Super Proton Synchrotron (SPS) and extensively tested to assess the feasibility of crystal-assisted collimation in circular hadron colliders. The a…
View article: The mathematical modeling of magnetic systems with rectangular structure for different experiments
The mathematical modeling of magnetic systems with rectangular structure for different experiments Open
Design, construction and operation of the magnetic systems of some electrophysical setups require a preliminary mathematical modeling as well as a constant maintenance of mathematical modeling when debugging and operating the setups. While…
View article: The Boundary Value Problem for Elliptic Equation in the Corner Domain in the Numerical Simulation of Magnetic Systems
The Boundary Value Problem for Elliptic Equation in the Corner Domain in the Numerical Simulation of Magnetic Systems Open
АннотацияПостановка краевой задачи возникает в магнитостатике при моделировании распределения магнитного поля методом двух скалярных потенциалов в области, содержащей ферромагнетик и вакуум.Нелинейность задачи обусловлена зависимостью свой…
View article: Observation of strong reduction of multiple scattering for channeled particles in bent crystals
Observation of strong reduction of multiple scattering for channeled particles in bent crystals Open
Strong reduction of multiple scattering for channeled particles has been observed in an experiment on the deflection of a 180 GeV/c π+-meson beam by bent silicon crystals. The RMS deflections due to multiple scattering for the channeled pa…
View article: Angular asymmetry of the nuclear interaction probability of high energy particles in short bent crystals
Angular asymmetry of the nuclear interaction probability of high energy particles in short bent crystals Open
The rate of inelastic nuclear interactions in a short bent silicon crystal was precisely measured for the first time using a 180 GeV/c positive hadron beam produced in the North Experimental Area of the CERN SPS. An angular asymmetry depen…
View article: Kinematics of proton and deuteron beam polarization in the transparent spin mode of the NICA collider
Kinematics of proton and deuteron beam polarization in the transparent spin mode of the NICA collider Open
For experiments with polarized protons and deuterons, the NICA collider is planned to be used in the transparent spin mode, which is provided by two solenoid snakes. The required direction of polarization in the SPD detector is set by “spi…
View article: Beam steering performance of bent silicon crystals irradiated with high-intensity and high-energy protons
Beam steering performance of bent silicon crystals irradiated with high-intensity and high-energy protons Open
Beam steering performance of bent silicon crystals irradiated with high-intensity and high-energy protons has been studied. In particular, crystals of the type used for collimation and extraction purposes in the Large Hadron Collider and t…
View article: Double-crystal setup measurements at the CERN SPS
Double-crystal setup measurements at the CERN SPS Open
In this paper, we discuss an experimental layout for the two-crystals scenario at the Super Proton Synchrotron (SPS) accelerator. The research focuses on a fixed target setup at the circulating machine in a frame of the Physics Beyond Coll…
View article: Status and Perspectives of the NICA Project
Status and Perspectives of the NICA Project Open
The NICA (Nuclotron-based Ion Collider fAcility) is the new international research facility under construction at the Joint Institute for Nuclear Research (JINR) in Dubna. The main targets of the facility are the following: 1) study of hot…
View article: Measurement of analysing powers for neutron scattering on CH2, CH, C and Cu target for momenta from 3.0 to 4.2 GeV/c
Measurement of analysing powers for neutron scattering on CH2, CH, C and Cu target for momenta from 3.0 to 4.2 GeV/c Open
During two beam runs in the years 2016 and 2017, the analyzing powers (Ay) for protons and neutrons scattering on CH2, CH, C and Cu targets were measured at the nucleon momentum from 3.0 to 4.2 GeV/c with the ALPOM2 setup at the Nuclotron …
View article: The new light-ion linac for the NICA collider
The new light-ion linac for the NICA collider Open
With the realization of the NICA project, a joint team from JINR (Dubna, Russia) and Bevatech GmbH (Frankfurt-am-Main, Germany) is now realizing the new light ion linac LILac. Results of beam dynamics and conceptual design are discussed in…
View article: Dechanneling of high energy particles in a long bent crystal
Dechanneling of high energy particles in a long bent crystal Open
Experimental results on deflection of a 180 GeV/c pi(+)-meson beam by a 23 mm long bent silicon crystal are analyzed to study the dechanneling process of particles due to multiple scattering. A new approach for the determination of contrib…
View article: Study of inelastic nuclear interactions of 400 GeV/c protons in bent silicon crystals for beam steering purposes
Study of inelastic nuclear interactions of 400 GeV/c protons in bent silicon crystals for beam steering purposes Open
Inelastic nuclear interaction probability of 400 GeV/c protons interacting with bent silicon crystals was investigated, in particular for both types of crystals installed at the CERN Large Hadron Collider for beam collimation purposes. In …
View article: Spin Transparency Mode in the NICA Collider with Solenoid Siberian Snakes for Proton and Deuteron Beam
Spin Transparency Mode in the NICA Collider with Solenoid Siberian Snakes for Proton and Deuteron Beam Open
Two solenoid Siberian Snakes are required to obtain ion polarization in spin transparency mode of the NICA collider. The snake solenoids with a total field integral of 2×50 T·m are placed into the straight sections of the NICA collider. It…
View article: Source of polarized ions for the JINR accelerator complex
Source of polarized ions for the JINR accelerator complex Open
The JINR atomic beam type polarized ion source is described. Results of tests of the plasma ionizer with a storage cell and of tuning of high frequency transition units are presented. The source was installed in a linac injector hall of NU…
View article: Focusing of a particle beam by a crystal device with a short focal length
Focusing of a particle beam by a crystal device with a short focal length Open
Recent discussions about accelerators in high energy physics identified several challenges for the future, where it is necessary to focus particle beams over a distance of a few cm. In this paper, we investigate the focusing of particles b…
View article: Observation of channeling in bent crystals at the CERN LHC
Observation of channeling in bent crystals at the CERN LHC Open
The feasibility of crystal-assisted collimation is being investigated for improvements of the LHC collimation system, as a part of the future high luminosity upgrade of the CERN LHC (HL-LHC). Two high-accuracy goniometers, each equipped wi…
View article: The Boundary Value Problem for Elliptic Equation in the Corner Domain in the Numerical Simulation of Magnetic Systems
The Boundary Value Problem for Elliptic Equation in the Corner Domain in the Numerical Simulation of Magnetic Systems Open
Modern accelerator systems and detectors contain magnetic systems of complex geometrical configuration. Design and optimization of the magnetic systems demands solving a nonlinear boundary-value problem of magnetostatic. The region in whic…
View article: High-efficiency deflection of high energy protons due to channeling along the 〈110〉 axis of a bent silicon crystal
High-efficiency deflection of high energy protons due to channeling along the 〈110〉 axis of a bent silicon crystal Open
A deflection efficiency of about 61% was observed for 400 GeV/c protons due to channeling, most strongly along the 〈110〉 axis of a bent silicon crystal. It is comparable with the deflection efficiency in planar channeling and considerably …
View article: Charge exchange<i>dp</i>→ (<i>pp</i>)<i>n</i>reaction study at 1.75 A GeV/c by the STRELA spectrometer
Charge exchange<i>dp</i>→ (<i>pp</i>)<i>n</i>reaction study at 1.75 A GeV/c by the STRELA spectrometer Open
The differential cross sections of the charge exchange reaction dp → (pp)n has been measured at 1.75 GeV/c momentum per nucleon for small transferred momenta using the one arm magnetic spectrometer STRELA at the Nuclotron accelerator. The …
View article: Orbital parameters of proton and deuteron beams in the NICA collider with solenoid Siberian snakes
Orbital parameters of proton and deuteron beams in the NICA collider with solenoid Siberian snakes Open
Two solenoid Siberian snakes are required to obtain ion polarization in the "spin transparency" mode of the NICA collider. The field integrals of the solenoid snakes for protons and deuterons at maximum momentum of 13.5 GeV/c are equal to …
View article: Numerical calculation of ion polarization in the NICA collider
Numerical calculation of ion polarization in the NICA collider Open
The NICA Collider with two solenoid Siberian snakes is "transparent" to the spin. The collider transparent to the spin provides a unique capability to control any polarization direction of protons and deuterons using additional weak soleno…
View article: NICA Facility in Polarized Proton and Deuteron Mode
NICA Facility in Polarized Proton and Deuteron Mode Open
NICA project at JINR is aimed at the experiments with polarized protons and deuterons at both as fixed target and colliding mode over beam momentum range from 2 to 13.5[Formula: see text]GeV/c. Polarized beams are injected into collider fr…
View article: Observation of strong leakage reduction in crystal assisted collimation of the SPS beam
Observation of strong leakage reduction in crystal assisted collimation of the SPS beam Open
In ideal two-stage collimation systems, the secondary collimator–absorber should have its length sufficient to exclude practically the exit of halo particles with large impact parameters. In the UA9 experiments on the crystal assisted coll…