The main requirement for the formation of vacuum conditions in charged particle accelerators is the reduction of particle losses on residual gas molecules. The rate of losses is determined by both the beam parameters and the composition of the residual gas. As the beam accelerates and accumulates in the accelerator chain, the requirements for the residual pressure change, so to maintain...
The Joint Institute for Nuclear Research (JINR) is constructing a heavy ion collider based on the existing superconducting synchrotron, Nuclotron – NICA (Nuclotron based Ion Collider fAcility). It will be a multistage accelerator complex designed to study the interactions of ions with matter.
The report presents the results of the joint commissioning of the BINP SB RAS and JINR power supply...
Injection complex is a source of electron and positron beams for both BINP colliders: VEPP-2000 and VEPP-4. Now it covers all consumer needs in beams, however, future BINP projects require operating with higher intensity beams. For this reason building the injection complex damping ring longitudinal coupling impedance model has become important. This work aims at collective effect studies:...
To operate the angle of exit of the extracted ion beam, it is necessary to create a magnetic field changing with a frequency of up to 200 Hz. For this purpose the fast scanning magnets were developed and optimized to obtain a given irradiation field extracted ion beam. The shape of the poles is optimized to eliminate heating by eddy currents. Calculation of scanning magnets and magnetic field...
The generation of polarization radiation by electron beams passing near dielectric objects is attracted the attention of researchers due to the potential for introducing this effect to either measure the beam parameters or generate intense electromagnetic radiation beams in THz and sub-THz frequency range. One of the most interesting forms of this radiation is Cherenkov diffraction radiation...
The similarity of the effects of ionizing radiation and the effects of aging has been studied by many researchers at different levels of the organization of life, mainly molecular and cellular. Part of the research is aimed at studying radiation-induced changes in the central nervous system, experts in the field of molecular and cellular radiobiology noted the similarity of the identified...
High energy and elementary particle physics are the leading fields of science in recent decades. Since this, investigations of the properties of matter and the processes of collision and birth of new particles with subsequent detection and identification of the latter are being held all over the world. One of such mega-science projects is the NICA (Nuclotron-based Ion Collider Facility)...
Modeling of conformational excitations in a DNA molecule makes it possible to advance the study of fundamental patterns and mechanisms of biological functioning of living systems at the cellular level. Conformational excitations in the DNA molecule are involved in such important processes as transcription, translation, denaturation and replication.
In particular, the course of the replication...
Goal of the work:
Prove the following conjecture: The largest maximal subgroup of shifts of a multipermutation system in the Moran covering is isomorphic to the maximal discrete group of displacements (branchings) of Γ(c) To do this, prove the lemma 〖lim〗(n→∞) lim(k→∞)=#Aut(Γ)=ord(1/k)log#G_(n,k). Equivalent to this conjecture is the following statement: the vacuum expectation value of the...
The aims of the study are to create unique systems for cooling and thermal stabilization of the TPC and ECAL detectors of the MPD experiment (NICA project). The thermal stabilization of the TPC gas mixture Ar/CH4 (90:10) and nitrogen N2 is also an important part for the TPC detector.
The systems are “leakless” type. Cooling water (distilled or deionized) operates at a pressure of up to 0.3...
The study of molecular interaction kinetics is of crucial importance for fields such as medical diagnostics, pharmaceuticals, and the food industry. Although label-free biosensing methods, such as surface plasmon resonance, are widely used for kinetic studies, they face significant challenges. These include limitations in scaling to observe multiple interactions simultaneously, the complexity...
The capability to generate DNA molecules of designed architectures has allowed scientists to explore novel applications in various fields, including structural biology, drug delivery and creating new DNA microelectronic devices. The last application requires developing models with a detailed account of both the electronic and structural properties of DNA, as well as its interaction with...
Nanostructured materials based on CuSn(S,Se)2 are of interest in the context of renewable energy. They are effective photoadsorbers [1], and in addition, they have a high structural susceptibility to moisture adsorption. Thanks to the use of nanostructured photo adsorbers, it becomes possible to create a hybrid system that combines the properties of both phototransformers and converters of...
Ferritin nanoparticles have emerged as crucial components in new recombinant vaccine platforms. As we previously demonstrated in our previous works, the rational design of ferritin-immunogen nanoparticles remains a bottleneck in developing novel tools for drug delivery and immunology [1], [2]. This challenge arises from the stochastic nature of ferritin's self-assembly, which also affects...
Nuclear power plants are used to study properties of neutrino oscillation. The intensive antineutrino flux provides the large statistics, the main uncertainties come from systematic.
Usually, the baseline of reactor experiments, the distance between the reactor and the detector, varies from 0.5 km or more. It allows to effectively measure the oscillation parameters $\Delta m^2_{32}$,...
The Hartree-Fock (HF) method is one of the most important methods of electronic structure theory. So there is interest in this algorithm, for example, within the framework of a future software ecosystem for high-precision multi-scale ab initio relativistic quantum modeling of atoms, molecules, and materials (part of the BUFO program [1]). But the conventional sequential program...
Over the last few decades, significant progress has been made in the study of the $g$ factor of highly charged ions [1,2]. To date, the experimental accuracy for hydrogen-, lithium- and boron-like ions has reached values in the range of $10^{-9}$ - $10^{-11}$ [3-7]. These studies have provided the most precise value of the electron mass [8, 9]. Additionally, by measuring the $g$ factor of...
This paper presents a software-hardware complex for measuring the tension of the anode wire in drift tubes used in the SPD experiment's straw tracker at the NICA collider. The tension of the anode wire is critical for ensuring the accuracy of coordinate determination, as it affects electrical stability and the positioning of the wire due to electrostatic and gravitational forces.
The...
Gas type detectors nowadays utilise a resistive coating known as DLC (Dimond Like Carbon). It is this coating that acts as a current limiting resistor that not only diverts the electron avalanche after multiplication, but also prevents electrical breakdown in the gas. The resistance of DLC coatings varies over a wide range from units of kOhm to hundreds of Gohm depending on the method of...
Magnetic properties of Ni, Fe, Co nanowires synthesized using porous Al2O3 matrices
The magnetic properties of one-dimensional ferromagnetic nanostructures with diameters in the nanometer range and macrolengths are actively studied and many scientific works are devoted to them due to their non-trivial magnetic...
The article presents the results of a study of the mechanisms of coherent transient radiation (CTR) in the sub-terahertz frequency range. This type of radiation can be used to diagnose short electron bunches and can serve as a basis for the development of radiation sources in the THz and sub-THz range. The AREAL linear accelerator with an energy of 3.6 MeV, located at the CANDLE Synchrotron...
The dynamics of recovery of the open porous structure in HDPE films, which are preliminarily uniaxially deformed in the medium of supercritical $CO_2$ followed by shrinkage in the longitudinal direction, upon their repeated stretching in air is studied by structural mechanical methods. The process of shrinkage is accompanied by the approach of lamellas and the disappearance of the oriented...
Transglutaminases (TGases) are a unique group of enzymes that facilitate the post-translational modification of proteins by forming isopeptide bonds. Understanding that diverse processes such as normal and cancerous cell growth, reproduction, and cell death rely on sufficient levels of transglutaminases and that these enzymes can influence the differentiation and proliferation of various cell...
One of the key issues in modern physics is understanding strong interactions and, in particular, studying the properties of strongly interacting matter in equilibrium. Strongly interacting matter at extreme densities and temperatures is expected to be in the state of quasi-free quarks and quark-gluon plasma (QGP) [1]. This hypothesis motivates the study of phases (QGP and hadron gas) and...
At the commissioning stage of the NICA project, the electronics of the Nuclotron radio frequency (RF) stations are being modernized in parallel. The main achievements to date include the development and commissioning of two key elements of the system: an adjustable amplifier unit with automatic gain control and a remote control unit for RF stations. The remote control unit for RF stations...
In the first phase of the SPD experiment, the main tracking system will be supplemented by a Micromegas-based central tracker. When operating in a magnetic field, the performance of Micromegas detectors is largely determined by the gas mixture used. Experimental study results combined with detector simulation are presented.
Geant4 hadronic physics sub-library includes a wide variety of models for high and low-energy hadronic interactions. We report on recent progress in development of the Geant4 nuclear de-excitation module. This module is used by many Geant4 models for sampling of de-excitation of nuclear recoil produced in nuclear reactions. Hadronic shower shape and energy deposition are sensitive to these...
A track scintillation detector based on SiPM matrices has been developed. The detector has two arms oriented at 90 degrees relative to each other. To obtain an image of the particle track, it is necessary to focus the scintillation light on the SiPM matrix. The report describes the measurement process using Fresnel lenses and glass lenses.
In December, 2022 - January, 2023 the BM@N experiment conducted
its first physics run with full detector configuration. Over 500 million
events of Xe+CsI interactions with the Xe beam kinetic energy of
3.8A GeV were collected.
Since then, strong efforts have been put to reconstruct and
analyze the collected data. The current status of this activity will
be presented on the example...
This work presents calculations of the bond distances and dissociation energies of LiH, NaH, KH, RbH, CsH, FrH and 119H. The electron configuration of alkali metals contains one open s-orbital, therefore the molecular shells of alkali metal hydrides are closed, which simplifies the study of these molecules’ chemical properties.
To take into account electronic structure we use coupled cluster...
SEC-SAXS structural studies of ferritin-based heterooligomers
Oksana M. Tilinova, Margarita S. Gette, Vsevolod V. Sudarev, Yury L. Ryzhykau, Sergey V. Bazhenov, Ilya V. Manukhov, Alexander I. Kuklin, Alexey V. Vlasov
Ferritin is an iron storing protein complex typical for almost all living organisms. Ferritin complex poses the ability to self-assemble into a hollow sphere from 24...
The opaque scintillator detector is a novel concept for a new generation of position-sensitive detectors. The main idea is to localize the light near the point of its scintillation via the scattering medium. The first and only published results by the LiquidO collaboration are based on the usage of an opaque liquid scintillator.
Our approach suggests the usage of media based on solid granular...
Ferritin is a protein complex responsible for storing iron in living systems. One of its most remarkable properties is an ability to spontaneously form a spherical hollow protein globule consisting of 24 subunits, this process known as self-assembly [1]. This unique characteristic, combined with ferritin's exceptional stability across a wide range of temperatures and pH levels [2], make it a...
In this work, graphene-based nanostructures on ferrimagnetic substrates such as SmMnC$_3$Cu, EuMnC$_3$Cu, and GdMnC$_3$Cu were investigated. Supercells for the investigated materials were modeled and electronic properties such as the band structure and density of electronic states were calculated using density functional theory. The work was supported by the Ministry of Science and Higher...
I will present the information about T2K experiment, the near detector ND280 and it’s new subdetector
SuperFGD recently commissioned in the neutrino beam at J-PARC (Japan). SuperFGD is a 3D fine grained scintillating detector. It will detect neutrinos before oscillations and reconstruct kinematic parameters of charged particles with high precision in full solid angle.
Абстракт (Аннотация)
В статье разбирается одна из причин роста продольного эмиттанса в Бустере, возникшая в четвертом пуско-наладочном сеансе, а затем предлагается эффективный способ диагностики. Рассматриваются особенности метода, аппаратное решение и программной обеспечение.
Abstract
The article discusses one of the reasons for the increase of longitudinal emittance in Booster, which...
The adjustable amplifier unit in combination with the automatic gain control unit is designed to regulate and maintain the amplitude of the RF voltage at the accelerating electrode at a predetermined level. The tasks included circuit modernization, installation and bench testing of an adjustable amplifier. The circuit and topology of the board were developed to ensure the uniformity of...
One of the SCAN-3 multilayer neutron detectors on the neutron channel in LPI (Troitsk) has been studied. The photodesintegration reaction of a deuteron was used to form a neutron beam. The report describes the procedure for creating a neutron channel, the channel parameters, as well as the results obtained during the work.
In the course of this work, a review of articles on the topic was conducted, some methodological errors were identified and contradictions in the experimental results were revealed. An analysis of the Frank et al. experiment from 2002 was performed. It was shown that the depth of oxide penetration into the protective layer of titanium, which was used in this experiment to prevent gadolinium...
Time- correlated single photon counting (TCSPC) technique as a powerful analysis tool be used in fluorescence spectroscopy and imaging to measure the fluorescence lifetime of sample. In this report, by analyzing the decay curve of Al2O3 and MgAl2O4 single crystals irradiated by high energy Xe and Bi ions to several fluences. The measurements of the photoluminescence decay curves indicated...
This research is dedicated to the problem of strict topologically algebraic proof of discreetness and nondegeneracy of $\mathscr{N} = a^{\dagger} a$ operator in the Hilbert space. It is crucial for building of eigen spaces of operator $\mathscr{N}$ whose direct sum forms the Hilbert space.
