The absolute polarimeter for measurements of proton and antiproton beam polarizations at the SPASCHARM experiment at U-70 of IHEP, Protvino, is discussed. Polarized target will be used to measure analyzing power AN of the elastic reactions. Measured value of AN is required to define beam polarization. Two different detectors of the experimental setup were analyzed. The first one is supposed to...
The possibility to use the pp-, pd- and dd- elastic scattering for the polarimetry at NICA using the existing experimental data is discussed. The first results of the simulation of these processes at the total energy up to 27 GeV for the segmented scintillation counter are presented.
Data taking has been started at the first stage of the polarization experiment SPASCHAR$M at U70 accelerator. The report describes the detectors of the current experimental setup as well as the results of measurements of their characteristics during the beam data taking in the runs of 2018-2022
Antineutron studies are an unexplored domain of high energy physics. Several directions of research can be outlined, such as: measuring of hadrons decaying into antineutrons, measuring the interaction of antineutrons with hadrons, and searching for bound states of antineutrons. We present a method for measuring antineutrons by the electromagnetic calorimeter PHOS of the ALICE experiment. The...
T2K (Tokai to Kamioka) is the first long-base neutrino experiment with the concept of an off-axis neutrino beam generated by a 30 GeV proton synchrotron (PS) based on the Japan Proton Accelerator Research Complex (J-PARC).
This project is aimed at finding of a new source of violation of charge-conjugation parity-reversal CP-symmetry in the neutrino sector - a necessary element for explaining...
The annihilation photons are the first system where the entanglement of quantum states was experimentally studied. These photons are produced in the positron-electron annihilation and have 511 keV energy that coincides with the electron mass. According to the theory, two photons have mutually perpendicular linear polarizations, and their quantum states are entangled. Inspite of extensive...
DANSS detector at Kalininskaya nuclear power plant sets world records in antineutrino detection. Counting rates of up to 5000 events per day made it possible to collect more than 6.5 million antineutrinos in 6 years of stable operation. The data sample is extremely clean and features the signal to background ratio in excess of 50. Yet only moderate energy resolution of 34% at 1 MeV limits the...
Aging of the plastic scintillators plays a significant role in the degradation
of detectors performance. Several effects are considered responsible for
this process like mechanical stresses, water penetration and oxidation.
The DANSS detector core consists of 2500 polystyrene based scintillation strips.
The detector is located just below an industrial nuclear reactor
of Kalininskaya NPP. The...
The intrinsically large variation of the energy deposited in a calorimeter by hadrons imposes limitations on the improvement of hadron energy resolution. The fluctuation of electromagnetic fraction within a hadronic shower is known to be one of the main sources of such variations. Several techniques were developed to improve the energy resolution for hadrons including the so called hardware...
The technology of highly granular calorimeters is one of the main innovations that will be implemented in planned experiments on future colliders. This work shows an algorithm for the improvement of energy resolution in highly granular calorimeters based on a machine learning technique. An artificial neural network, which helps to connect calorimeter observables, was trained and tested. The...
M.Bhattacharjee1,3, S.A.Bulychjov2, Yu.F.Krechetov1, V.V. Kulikov2,
M.A. Martemianov2, M.A. Matsyuk2, I.A. Tyapkin1
1 Joint Institute for Nuclear Research, 141980, Dubna, Russia
2 National Research Center “Kurchatov Institute”, Moscow, 123182 Russia
3 Gauhati University, Guwahati, Assam 781014, India
In a framework of the NICA/MPD project [1], a cylindrical electromagnetic calorimeter...
SPD (Spin Physics Detector) collaboration proposes to install a universal setup in the second interaction point of the NICA collider (JINR, Dubna) to study the spin structure of the proton and deuteron. It will be able to research of spin-related phenomena with polarized proton and deuteron beams at a collision energy up to 27 GeV and a luminosity up to 10$^{32}$ cm$^{-2}$ s$^{-1}$. In this...
The LHCb Upgrade phase II aims to collect $300 fb^{-1}$ in a few years operating at a luminosity of $1.5*10^{34} cm^{-2} s^{-1}$. This requires a significant change of the systems including the electromagnetic calorimeter (ECAL), which must be capable to sustain integrated radiation doses up to 1 MGy in the innermost region. The second major requirement is time resolution of the order of a few...
The NA61/SHINE is a fixed target experiment at SPS (CERN) aimed to study proton-ion and ion-ion collisions with the energy range 13 – 150 AGeV. A new physics program of the NA61/SHINE experiment beyond 2020 includes open charm measurements. The increased by an order of magnitude beam rate requires detectors upgrade to work with high trigger rate and to survive in new high radiation...
Detection of low energy neutrino is a challenging task for advanced
studies of coherent neutrino scattering processes or for the observation
of neutrino magnetic momentum. For this purpose, the detector must be
capable to register the deposited energies starting from a hundred of
eV. One of the option is the development of CsI(pure) scintillation
detector operating at the temperature of...
Studying spin-related phenomena will help uncover information about internal structure of nucleon. It can be done using polarized beams of protons and deuterons. To study those effects on NICA collider it is proposed to install the Spin Physics Detector(SPD) in one of two interaction points.
In this work two problems were studied. First is developing a fast and accurate algorithm for...
The results of development and laboratory testing of a prototype data concentrator integrated circuit (ASIC HUBv1) are presented. HUBv1 was developed for processing of signals from the detector chips of the time-projection chamber of the MPD experiment (NICA, Dubna). The main target of this ASIC is uninterrupted processing and serialization of digital output data from two SAMPA detector chips...
The cool storage ring (CSR) external-target experiment (CEE) will be the first large-scale nuclear physics experiment at the Heavy Ion Research Facility in Lanzhou (HIRFL). Within the project of CEE, a gaseous detector is being developed for the beam monitoring. It is designed to measure the lateral position of each beam particle up to a rate of $10^{6}$ pps with a spatial resolution better...
In the frame of the JINR scientific program on study of hot and dense baryonic matter a new accelerator complex Ion Collider fAcility (NICA) based on the Nuclotron-M is under realization. It will operate at a luminosity up to 1027 cm-2 s-1 for ions up to Au79+. Two interaction points are foreseen at NICA for two detectors which will operate simultaneously. One of these detectors, the...
NICA (Nuclotron-based Ion Collider fAсility) is a new accelerator complex designed at the Joint Institute for Nuclear Research to study properties of dense baryonic matter. Two interaction points are foreseen in the NICA collider: one for studying the collision of heavy ions on the Multipurpose detector MPD, the other for polarized beams for the experiment on the SPD installation. The...
A new Time-Of-Flight neutron detector for the BM@N experiment at JINR, Dubna is planned to be developed and produced. This detector will identify and measure the energies of neutrons produced in nucleus-nucleus collisions at energies up to 4 AGeV. Detector design utilizes small (40x40x25mm) scintillator tiles with solid-state readout, with timing resolution of up to 100-150ps. A small-scale...
Baryonic Matter at Nuclotron (BM@N) is the first experiment at the NICA accelerator complex. The aim of the BM@N experiment is to study interactions of relativistic heavy ion beams with fixed targets. Detectors based on Gas Electron Multipliers (GEM) are used of the central tracking system, which is located inside the BM@N analyzing magnet. The next BM@N physics run is planned at the end of...
The BM@N experiment is an ongoing fixed-target experiment launched on the extracted beam of the Nuclotron accelerator to study highly compressed nuclear matter. The forward detectors of the BM@N experiment are designed to determine the geometry of nucleus-nucleus collisions - the centrality and orientation of the reaction plane, as well as to measure the charge distributions of spectator...
A more recently launched UCN source development utilizes superfluid helium (He-II) as conversion medium of cold neutrons into ultracold one. Initially proposed and designed for PNPI’s old WWR-M reactor, the project has been reshaped to equip the institute’s PIK reactor with a modern UCN source of this type. The projected UCN density in the closed source chamber is 2200 cm-3, which, as...
Monte Carlo simulation of the complex of research with ultracold neutrons at the PIK reactor (Gatchina, Russia) is carried out. The complex is being built on the basis of a high-intensity source of ultracold neutrons at the GEK-4 channel. A Monte Carlo model has been developed, which includes a source, a neutron guide system and experimental installations, taking into account their real...
Trackers build of straw drift tubes are a perfect solution for precise track measurements in High Energy and Neutrino Physics experiments operating at low and moderate event rate. Straw Trackers will play crucial roles in such future detectors as Near-Detector Complex of the DUNE experiment, Hidden Sector Detector of the SHiP experiment and the SPD detector. Performance requirements on a...
The change in temperature of single crystals in vacuum conditions, such as lithium tantalate (LiTaO3), gives an attractive possibility to generate and accelerate electron and positive ions fluxes up to 100 keV and more. This phenomenon is a base of the conception of a pyroelectric accelerator. This type of the accelerator is a compact device, which does not require an external high-voltage...
From strangeness to charm and beauty with Inner Tracking System of ALICE at LHC
Grigory Feofilov, Saint-Petersburg State University, RF,
on behalf of the ALICE Collaboration
In the first part of this talk, we present the major motivations for the current new ALICE physics programme of measurements of low-momentum charm and beauty hadrons and low-mass dielectrons in heavy-ion collisions...
Evaluation of the impact parameter in a single event of relativistic heavy ion collision is crucial for correct and efficient data processing and analysis. In this work, we studied the possibility of estimating the impact parameter in heavy ion collisions by using artificial neural networks applied to the charged particle data from the fast microchannel plate (MCP) detectors.
To carry out...
The data acquisition system contains 1488 Front-End Cards (FEC) grouped into 24 groups of 62 pcs. in each. Each FEC has an individual full-duplex few gigabit communication channel with Readout and Control Unit (RCU). The RCU manages each FEC within the group, collects data and then transmits it via a high-speed optical channel. Every 4 optical channels are connected to a Local Data...
A series of low-pressure time-projection chambers for experiments with low-energy ions is being developed at the Budker Institute of Nuclear Physics. The development of the series began with the creation of a test chamber with the GEM based readout for the separation of ions by measuring the stopping range in the gas medium. This detector is designed to upgrade the accelerator based...
An upgraded version of the DGFRS-2 (the Dubna Gas-Filled Recoil Separator-2) analog spectrometer to search for rare ER-α correlated sequence in a real-time mode to suppress radically cyclotron associated background signals is presented. New “flexible” algorithm to operate with new analog spectrometer of the DGFRS-2 installed at DC-280 (the JINR Superheavy Element Factory) cyclotron setup is...
The RED-100 is a two-phase LXe detector designed for searching CEvNS of reactor antineutrino. In 2021 this detector was located on Kalinin NPP, data collection was finished at the beginning of 2022. In this report methods of data processing and analysis, signal correction, event selection, position and energy reconstruction are described. Results of calibration and comparison with simulation...
An ionization loss simulation in several sequent gaps of the neutron detector is preformed. It is based on the rigid layer converter so as boron-10 or lithium-6 and gaseous chamber. It was shown that the distribution of ionization losses over gas gaps varies significantly depending on the incident neutron energy.The fact can be used to control the energy of the neutron flux using this detector.
At present, the primary computational problems in particle physics experiments is the amount
of computing resources to facilitate the slow low level simulation of particles passing through
the detector material.
A promising way to work around this problem driven by the low speed of the full low level Geant4 simulation
is to use a data-driven surrogate generative models instead. Such models may...
