С.Б. Дабагов
A5043097318- Crystallography and Radiation Phenomena
- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Accelerators and Free-Electron Lasers
- Nuclear materials and radiation effects
- Laser-Plasma Interactions and Diagnostics
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Advanced Electron Microscopy Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Muon and positron interactions and applications
- Advanced X-ray and CT Imaging
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Cultural Heritage Materials Analysis
- Electron and X-Ray Spectroscopy Techniques
- Glass properties and applications
- Laser-Matter Interactions and Applications
- Neutrino Physics Research
- Medical Imaging Techniques and Applications
- Carbon Nanotubes in Composites
- Radiation Therapy and Dosimetry
- X-ray Diffraction in Crystallography
- High-pressure geophysics and materials
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2015-2024
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2015-2024
Moscow Engineering Physics Institute
2015-2024
Institute of Engineering Physics
2024
Frascati Scienza
2024
Institute of Medical Cell Technologies
2018-2022
Istituto Nazionale di Fisica Nucleare
1999-2021
National Agency for New Technologies, Energy and Sustainable Economic Development
2018
Université Paris-Sud
2016-2017
GANIL
2017
We present the first results of Fermilab Muon g-2 Experiment for positive muon magnetic anomaly $a_\mu \equiv (g_\mu-2)/2$. The is determined from precision measurements two angular frequencies. Intensity variation high-energy positrons decays directly encodes difference frequency $\omega_a$ between spin-precession and cyclotron frequencies polarized muons in a storage ring. ring field measured using nuclear resonance probes calibrated terms equivalent proton spin precession...
We present a new measurement of the positive muon magnetic anomaly, a_{μ}≡(g_{μ}-2)/2, from Fermilab Muon g-2 Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, ω[over ˜]_{p}^{'}, anomalous precession frequency corrected for beam dynamics effects, ω_{a}. From ratio...
The Muon g-2 Experiment at Fermi National Accelerator Laboratory (FNAL) has measured the muon anomalous precession frequency $ω_a$ to an uncertainty of 434 parts per billion (ppb), statistical, and 56 ppb, systematic, with data collected in four storage ring configurations during its first physics run 2018. When combined a precision measurement magnetic field experiment's ring, determines anomaly $a_μ({\rm FNAL}) = 116\,592\,040(54) \times 10^{-11}$ (0.46 ppm). This article describes...
Two high-accuracy goniometers equipped with two bent silicon crystals were installed in the betatron cleaning insertion of CERN Large Hadron Collider (LHC) during its long shutdown. First beam tests recently performed at LHC 450 GeV/c and 6500 stored proton beams to investigate feasibility halo collimation assisted by crystals. For first time channeling protons was observed a particle accelerator. A strong reduction losses due nuclear inelastic interactions aligned crystal comparison...
The Fermi National Accelerator Laboratory has measured the anomalous precession frequency $a^{}_\mu = (g^{}_\mu-2)/2$ of muon to a combined precision 0.46 parts per million with data collected during its first physics run in 2018. This paper documents measurement magnetic field storage ring. is monitored by nuclear resonance systems and calibrated terms equivalent proton spin spherical water sample at 34.7$^\circ$C. weighted distribution resulting $\tilde{\omega}'^{}_p$, denominator ratio...
We present details on a new measurement of the muon magnetic anomaly, $a_\mu = (g_\mu -2)/2$. The result is based positive data taken at Fermilab's Muon Campus during 2019 and 2020 accelerator runs. uses $3.1$ GeV$/c$ polarized muons stored in $7.1$-m-radius storage ring with $1.45$ T uniform field. value $ a_{\mu}$ determined from measured difference between spin precession frequency its cyclotron frequency. This normalized to strength field, using Nuclear Magnetic Resonance (NMR). ratio...
On the wake of results obtained so far at SPARC_LAB test-facility Laboratori Nazionali di Frascati (Italy), we are currently investigating possibility to design and build a new multi-disciplinary user-facility, equipped with soft X-ray Free Electron Laser (FEL) driven by ∼1 GeV high brightness linac based on plasma accelerator modules. This study is performed in synergy EuPRAXIA study. In this paper report about recent progresses going facility.
After a brief review of the main areas research in X-ray optics and an analysis development capillary optics, general theory radiation propagation through capil- lary structures is described both geometrical wave approximations. Analysis field structure inside waveguide shows that channels can be purely modal nature, with transmitted energy mostly concentrated immediate neighborhood inner walls. A qualitative change scattering decreasing channel diameter — namely, transition from surface...
A study of crystal assisted collimation has been continued at the CERN SPS for different energies stored beams using 120 GeV/c and 270 protons Pb ions with per charge. bent silicon used as a primary collimator deflected halo particles channeling directing them into tungsten absorber. strong correlation beam losses in off-momentum intensity measured first high dispersion (HD) area downstream was observed. In conditions, loss rate induced by inelastic interactions nuclei is significantly...
We present a new measurement of the positive muon magnetic anomaly, $a_\mu \equiv (g_\mu - 2)/2$, from Fermilab Muon $g\!-\!2$ Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, $\tilde{\omega}'^{}_p$, anomalous precession frequency corrected for beam dynamics effects,...
We present an idea for creation of a crystalline undulator and report its first realization. One face silicon crystal was given periodic microscratches (grooves) by means diamond blade. The x-ray tests the deformation due to pattern surface scratches have shown that sinusoidal-like shape is observed on both scratched opposite (unscratched) crystal; is, goes through bulk crystal. This opens up possibility experiments with high-energy particles channeled in undulator, novel compact source radiation.
The results of observation and studies focusing 400 GeV/c proton beam with the help bent single crystals are presented. Two silicon have been used in measurements. focal length first second is found to be 1.48 m 0.68 m, respectively. mean square size horizontal profile focus was 3.1 4.3 times as small at exit crystals.
Bent silicon crystals mounted on high-accuracy angular actuators were installed in the CERN Super Proton Synchrotron (SPS) and extensively tested to assess feasibility of crystal-assisted collimation circular hadron colliders. The adopted layout was exploited regularly upgraded for about a decade by UA9 Collaboration. investigations provided compelling evidence strong reduction beam losses induced nuclear inelastic interactions aligned comparison with amorphous orientation. A conceptually...
CUPID will be a next generation experiment searching for the neutrinoless double $\beta$ decay, whose discovery would establish Majorana nature of neutrino. Based on experience achieved with CUORE experiment, presently taking data at LNGS, aims to reach background free environment by means scintillating Li$_{2}$$^{100}$MoO$_4$ crystals coupled light detectors. Indeed, simultaneous heat and detection allows us reject dominant $\alpha$ particles, as proven CUPID-0 CUPID-Mo demonstrators. In...
Diffraction and refraction phenomena at the entrance of a hollow x-ray waveguide with weakly absorbing dielectric cladding layers are investigated using two independent approaches: (a) analytical (b) numerical solutions wave equation in paraxial (parabolic) approximation. It is shown that penetrating through material substantially modifies field near entrance. results significant increase total energy flux inside guiding layer additional spatial modulation electromagnetic field.
Channeling is the confinement of trajectory a charged particle in crystalline solid. Positively particles channeled between crystal planes oscillate with certain oscillation length, which depends on energy. A whose thickness half length for planar channeling may act as mirror particles. If incident angle plane less than critical channeling, under-barrier undergo an and exit reversal their transverse momentum, i.e., are "mirrored" by planes. Unlike traditional scheme relying millimeter-long...