W. Scandale
A5015063835- Particle Accelerators and Free-Electron Lasers
- Crystallography and Radiation Phenomena
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Advanced X-ray Imaging Techniques
- Nuclear materials and radiation effects
- High-Energy Particle Collisions Research
- Radiation Detection and Scintillator Technologies
- Microstructure and mechanical properties
- Advanced Electron Microscopy Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Geophysical Methods and Applications
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Magnetic confinement fusion research
- Gyrotron and Vacuum Electronics Research
- Photonic and Optical Devices
- X-ray Diffraction in Crystallography
- Physics of Superconductivity and Magnetism
- Advanced Fiber Optic Sensors
- Muon and positron interactions and applications
- Ion-surface interactions and analysis
- Quantum chaos and dynamical systems
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2012-2024
Imperial College London
2020-2024
European Organization for Nuclear Research
2013-2022
GANIL
2016-2017
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2013-2017
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2017
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2017
Joint Institute for Nuclear Research
2007-2017
Kurchatov Institute
2017
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...
A silicon crystal was used to channel and extract 70 GeV protons from the U-70 accelerator with an efficiency of 85.3+/-2.8%, as measured for a beam approximately 10(12) directed towards crystals 2 mm length in spills s duration. The experimental data follow very well prediction Monte Carlo simulations. This demonstration is important devising more efficient use Protvino provides crucial support implementing crystal-assisted slow extraction collimation other machines, such Tevatron, RHIC,...
The volume reflection phenomenon was detected while investigating 400 GeV proton interactions with bent silicon crystals in the external beam H8 of CERN Super Proton Synchrotron. Such a process observed for wide interval crystal orientations relative to axis, and its efficiency exceeds 95%, thereby surpassing any previously value. These observations suggest new perspectives manipulation high-energy beams, e.g., collimation extraction new-generation hadron colliders, such as Large Hadron...
The concept of crystal collimation relies on the use bent crystals to coherently deflect positively charged particles with suitable impact conditions by trapping them in potential well generated adjacent crystalline planes. resulting deflection is much higher than what can be achieved multiple scattering amorphous materials. For this reason, technique has been explored past decades for applications particle accelerators. In particular, a full test stand was installed betatron insertion Large...
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...
Volume reflection predicted in the mid-1980s by Taratin and Vorobiev has been observed for first time interactions of a 70 GeV proton beam with short bent crystal. Incident protons deviate from convex atomic planes bulk crystal as result coherent interaction lattice around tangency point particle trajectory curved plane. The deflection angle 2theta(R) was found to be (39.5+/-2.0) microrad, or (1.65+/-0.08)theta(c) terms critical channeling. process large probability respect channeling takes...
The trend of volume reflection parameters (deflection angle and efficiency) in a bent (110) silicon crystal has been investigated as function the curvature with 400 GeV/c protons on H8 beam line at CERN Super Proton Synchrotron. This Letter describes analysis performed six different curvatures showing that optimal radius for is approximately 10 times greater than critical channeling. A strong scattering by planar potential also observed bend close to one.
This paper presents a detailed study of the deflection phenomena $400\text{ }\text{ }\mathrm{GeV}/c$ proton beam impinging on new generation bent silicon crystals; tests have been performed at CERN Super Proton Synchrotron H8 line. Channeling and volume reflection angles are measured with an extremely precise goniometer high resolution microstrip detectors. Volume has observed for first time this energy, single-pass efficiency as large 98%, in good agreement simulation results. makes...
The new generation of hadron machines may profitably take advantage channeling for steering and collimation high-energy particle beams. In that case, the requirements on quality crystal surface are rather stringent in terms both lattice perfection roughness. Here, authors show structural morphological characterizations crystals fabricated through a method to achieve fulfills all needed specifications application machines.
Beam deflection due to axial channeling in a silicon crystal bent along the ⟨111⟩ axis was observed with 400 GeV/c protons at CERN Super Proton Synchrotron. The condition for doughnut scattering of by atomic strings attained. Such allowed one observe beam 50 μrad about 30% efficiency. contribution hyperchanneled states less than 2% according simulation results.Received 30 May 2008DOI:https://doi.org/10.1103/PhysRevLett.101.164801©2008 American Physical Society
The radiation emitted by $180\ensuremath{-}\mathrm{GeV}∕c$ volume-reflected electrons and positrons impinging on a bent crystal has been measured the H8RD22 Collaboration H8 beamline at CERN SPS. A dedicated spectrometer developed to measure high-energy photon spectra (up $\ensuremath{\sim}100\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$) under volume reflection: charged particle beams have separated bending magnet leptons were detected tagged microstrip silicon detectors Pb-scintillator sampling...
Deflection due to planar channeling and volume reflection in short bent silicon crystals was observed for the first time 150 GeV/c negative particles, π− mesons, at one of secondary beams CERN SPS. The deflection efficiency about 30% higher than 80% reflection. Volume occurs, spite attractive character forces acting between particles crystal planes, a wide angular range orientations determined by bend angle.
Channeling in a short bent silicon crystal was investigated at the CERN SPS using 400-GeV/c protons with an angular spread much narrower than critical channeling angle. Particle dechanneling due to multiple scattering on atomic nuclei of observed and its length measured be about 1.5 mm. For comparable such length, efficiency 83.4% recorded, which is close maximum value expected for parallel beam exceeds previously known limitation deflection long crystals.
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...
The interactions of 400 GeV protons with different sequences bent silicon crystals have been investigated at the H8 beam line CERN Super Proton Synchrotron. multiple volume reflection proton has studied in detail on a five-crystal reflector measuring an angular deflection theta = 52.96 +/- 0.14 microrad. efficiency was found larger than 80% for acceptance entrance 70 microrad, maximal value epsilon 0.90 0.01 0.03.