А. С. Белов
A5074453686- Dark Matter and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Atomic and Molecular Physics
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Cosmology and Gravitation Theories
- Magnetic confinement fusion research
- Muon and positron interactions and applications
- Plasma Diagnostics and Applications
- Mass Spectrometry Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Gyrotron and Vacuum Electronics Research
- Neutrino Physics Research
- Radioactive Decay and Measurement Techniques
- Nuclear physics research studies
- Solar and Space Plasma Dynamics
- Radiation Detection and Scintillator Technologies
- Quantum and Classical Electrodynamics
- Photocathodes and Microchannel Plates
Kazan State Technical University named after A. N. Tupolev
2024
Institute for Nuclear Research
2011-2022
Russian Academy of Sciences
2004-2016
Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
2011-2012
University of Oslo
2012
University of Pavia
2011
Istituto Nazionale di Fisica Nucleare
2011
Politecnico di Milano
2011
University of Milan
2011
Brookhaven National Laboratory
2009
Hypothetical low-mass particles, such as axions, provide a compelling explanation for the dark matter in universe. Such particles are expected to emerge abundantly from hot interior of stars. To test this prediction, CERN Axion Solar Telescope (CAST) uses 9 T refurbished Large Hadron Collider magnet directed towards Sun. In strong magnetic field, solar axions can be converted X-ray photons which recorded by detectors. 2013–2015 run, thanks low-background detectors and new telescope,...
We have searched for solar axions or similar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup with improved conditions in all detectors. From absence of excess X-rays when magnet was pointing Sun, we set an upper limit on axion-photon coupling 8.8 x 10^{-11} GeV^{-1} at 95% CL m_a <~ 0.02 eV. This result is best experimental over a broad range axion masses and eV also supersedes previous derived from energy-loss arguments globular-cluster stars.
Hypothetical axionlike particles with a two-photon interaction would be produced in the sun by Primakoff process. In laboratory magnetic field ("axion helioscope"), they transformed into x-rays energies of few keV. Using decommissioned Large Hadron Collider test magnet, CERN Axion Solar Telescope ran for about 6 months during 2003. The first results from analysis these data are presented here. No signal above background was observed, implying an upper limit to axion-photon coupling...
We have searched for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously reported results from CAST with evacuated magnet bores (Phase I), setting limits on lower mass axions, here report where were filled 4He gas II) of variable pressure. The introduction generates a refractive photon mγ, thereby achieving maximum possible conversion rate those axion masses ma match mγ. With 160 different...
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using 3He as a buffer gas. At T=1.8 K this allows larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with 4He. With about 1 h of data taking at each 252 different we have scanned the mass range 0.39 eV < m_a 0.64 eV. From absence excess X-rays when magnet was pointing Sun set typical upper limit on axion-photon coupling g_ag 2.3 x 10^{-10} GeV^{-1} 95% CL, exact...
The CERN Axion Solar Telescope has finished its search for solar axions with (3)He buffer gas, covering the range 0.64 eV ≲ ma 1.17 eV. This closes gap to cosmological hot dark matter limit and actually overlaps it. From absence of excess x rays when magnet was pointing Sun we set a typical upper on axion-photon coupling gaγ 3.3 × 10(-10) GeV(-1) at 95% C.L., exact value depending pressure setting. Future direct axion searches will focus increasing sensitivity smaller values gaγ, example by...
The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in 19.74 $\mu$eV to 22.47 mass range. detection concept follows Sikivie haloscope principle, where Dark Matter convert into photons within a resonator immersed magnetic field. is an array of four individual rectangular cavities inserted strong phase-matched maximize sensitivity. Here we report on data acquired 4124 h from 2019 2021. Each cavity equipped with fast frequency tuning mechanism...
The AEGIS experiment, currently being set up at the Antiproton Decelerator CERN, has objective of studying free fall antimatter in Earth's gravitational field by means a pulsed cold atomic beam antihydrogen atoms. Both duration and vertical displacement horizontally emitted atoms will be measured, allowing first test WEP with antimatter.
In non-hadronic axion models, which have a tree-level axion-electron interaction, the Sun produces strong flux by bremsstrahlung, Compton scattering, and axio-recombination, ``BCA processes.'' Based on new calculation of this flux, including for first time we derive limits Yukawa coupling gae axion-photon interaction strength gaγ using CAST phase-I data (vacuum phase). For ma≲10 meV/c2 find < 8.1 × 10−23 GeV−1 at 95% CL. We stress that next-generation helioscope such as proposed IAXO could...
Abstract The precise measurement of forces is one way to obtain deep insight into the fundamental interactions present in nature. In context neutral antimatter, gravitational interaction high interest, potentially revealing new that violate weak equivalence principle. Here we report on a successful extension tool from atom optics—the moiré deflectometer—for acceleration slow antiprotons. setup consists two identical transmission gratings and spatially resolving emulsion detector for...
The CERN Axion Solar Telescope (CAST) searches for $a\ensuremath{\rightarrow}\ensuremath{\gamma}$ conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward Sun. Two parallel bores filled with helium adjustable pressure to match x-ray refractive mass ${m}_{\ensuremath{\gamma}}$ axion search ${m}_{a}$. After vacuum phase (2003--2004), which is optimal ${m}_{a}\ensuremath{\lesssim}0.02\text{ }\text{ }\mathrm{eV}$, we used $^{4}\mathrm{He}$ 2005--2007...
We have searched for 14.4 keV solar axions or more general axion-like particles (ALPs), that may be emitted in the M1 nuclear transition of 57Fe, by using axion-to-photon conversion CERN Axion Solar Telescope (CAST) with evacuated magnet bores (Phase I). From absence excess monoenergetic X-rays when was pointing to Sun, we set model-independent constraints on coupling constants pseudoscalar couple two photons and a nucleon gaγ|−1.19gaN0+gaN3| < 1.36 × 10−16 GeV−1 ma 0.03 eV at 95% confidence level.
In this work we present a search for (solar) chameleons with the CERN Axion Solar Telescope (CAST). This novel experimental technique, in field of dark energy research, exploits both chameleon coupling to matter (βm) and photons (βγ) via Primakoff effect. By reducing X-ray detection threshold used axions from 1 keV 400 eV CAST became sensitive converted solar spectrum which peaks around 600 eV. Even though have not observed any excess above background, can provide 95% C.L. limit strength...
We describe a system designed to re-bunch positron pulses delivered by an accumulator supplied source and Surko-trap. Positron from the are magnetically guided in 0.085 T field injected into region free of magnetic fields through μ-metal terminator. Here positrons temporally compressed, electrostatically accelerated towards porous silicon target for production emission positronium vacuum. Positrons focused spot less than 4 mm FWTM bunches ∼8 ns FWHM. Emission vacuum is shown single shot...
The main goal of the AEgIS experiment at CERN is to test weak equivalence principle for antimatter. will measure free-fall an antihydrogen beam traversing a moir\'e deflectometer. determine gravitational acceleration g with initial relative accuracy 1% by using emulsion detector combined silicon micro-strip time flight. Nuclear emulsions can annihilation vertex atoms precision about 1 - 2 microns r.m.s. We present here results detectors operated in vacuum low energy antiprotons from...
The understanding of the origin dark matter has great importance for cosmology and particle physics. Several interesting extensions standard model dealing with solution this problem motivate concept hidden sectors consisting SU(3)xSU(2)_LxU(1)_Y singlet fields. Among these models, mirror is certainly one most interesting. explains parity violation in weak interactions, it could also explain baryon asymmetry Universe provide a natural ground explanation matter. have portal to our world...
We report on a first measurement with sensitive opto-mechanical force sensor designed for the direct detection of coupling real chameleons to matter. These dark energy candidates could be produced in Sun and stream unimpeded Earth. The KWISP detector installed CAST axion search experiment at CERN looks tiny displacements thin membrane caused by mechanical effect solar chameleons. are detected Michelson interferometer homodyne readout scheme. benefits from focusing action ABRIXAS X-ray...
Status of the JINR polarized ion source development is described. The under tests at test-bench LHEP, JINR. A charge-exchange plasma ionizer has been tested initially without a storage cell in ionization region. An unpolarized deuterium beam with peak current 160 mA, 23 keV energy, pulse duration 100 μs and repetition rate 1 Hz extracted from ionizer. With free atomic hydrogen injected into proton 1.4 mA obtained. nearest plans for include tuning high frequency transition units installed...
The AEgIS Experiment is an international collaboration based at CERN whose aim to perform the first direct measurement of gravitational acceleration g antihydrogen in field Earth. Cold will be produced with a pulsed charge exchange reaction cylindrical Penning trap where antiprotons cooled 100mK. cold excited Rydberg state and subsequently formed into beam. deflection beam measured by using Moiré deflectometer gratings. After being approved late 2008, started taking data commissioning phase...
The formation of the antihydrogen beam in AEGIS experiment through use inhomogeneous electric fields is discussed and simulation results including geometry apparatus realistic hypothesis about initial conditions are shown. resulting velocity distribution matches requirements gravity experiment. In particular it shown that provide radial cooling during acceleration.
The JINR atomic beam type polarized ion source is described. Results of tests the plasma ionizer with a storage cell and tuning high frequency transition units are presented. was installed in linac injector hall NUCLOTRON May 2016. has been commissioned used runs 2016 February – March 2017. Polarized unpolarized deuteron beams were produced as well protons for acceleration NUCLOTRON. pulsed current up to 2 mA produced. Deuteron polarization 0.6-0.9 theoretical values different modes...