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17 results on '"Yu.M. Ivanov"'

1. Observation of strong reduction of multiple scattering for channeled particles in bent crystals

Author

W. Scandale, G. Arduini, F. Cerutti, M. Garattini, S. Gilardoni, R. Losito, A. Masi, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, G. Smirnov, D. Breton, L. Burmistrov, V. Chaumat, S. Dubos, J. Maalmi, V. Puill, A. Stocchi, E. Bagli, L. Bandiera, M. Romagnoni, V. Guidi, A. Mazzolari, F. Murtas, F. Addesa, G. Cavoto, F. Iacoangeli, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, A.A. Durum, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, A.D. Kovalenko, A.M. Taratin, A.S. Denisov, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, L.G. Malyarenko, V.V. Skorobogatov, G. Auzinger, J. Borg, T. James, G. Hall, and M. Pesaresi

Subjects
Physics, QC1-999
Abstract

Strong reduction of multiple scattering for channeled particles has been observed in an experiment on the deflection of a 180 GeV/c π+-meson beam by bent silicon crystals. The RMS deflections due to multiple scattering for the channeled particles were about six times smaller than for non-channeled ones. It was shown that the approach suggested recently for the description of multiple scattering for channeled particles using the experimental data for random crystal orientations gives fair agreement with the experiment. Keywords: Crystal, Channeling, Multiple scattering, Dechanneling, Beam deflection

Published
2020
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2. High-efficiency deflection of high energy protons due to channeling along the 〈110〉 axis of a bent silicon crystal

Author

W. Scandale, G. Arduini, M. Butcher, F. Cerutti, M. Garattini, S. Gilardoni, A. Lechner, A. Masi, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, G. Smirnov, D. Breton, L. Burmistrov, V. Chaumat, S. Dubos, J. Maalmi, V. Puill, A. Stocchi, E. Bagli, L. Bandiera, G. Germogli, V. Guidi, A. Mazzolari, S. Dabagov, F. Murtas, F. Addesa, G. Cavoto, F. Iacoangeli, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, A.A. Durum, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, A.D. Kovalenko, A.M. Taratin, A.S. Denisov, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, L.G. Malyarenko, V.V. Skorobogatov, T. James, G. Hall, M. Pesaresi, and M. Raymond

Subjects
Crystal, Channeling, Beam deflection, Physics, QC1-999
Abstract

A deflection efficiency of about 61% was observed for 400 GeV/c protons due to channeling, most strongly along the 〈110〉 axis of a bent silicon crystal. It is comparable with the deflection efficiency in planar channeling and considerably larger than in the case of the 〈111〉 axis. The measured probability of inelastic nuclear interactions of protons in channeling along the 〈110〉 axis is only about 10% of its amorphous level whereas in channeling along the (110) planes it is about 25%. High efficiency deflection and small beam losses make this axial orientation of a silicon crystal a useful tool for the beam steering of high energy charged particles.

Published
2016
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3. Observation of channeling for 6500 GeV/c protons in the crystal assisted collimation setup for LHC

Author

W. Scandale, G. Arduini, M. Butcher, F. Cerutti, M. Garattini, S. Gilardoni, A. Lechner, R. Losito, A. Masi, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, P. Schoofs, G. Smirnov, G. Valentino, D. Breton, L. Burmistrov, V. Chaumat, S. Dubos, J. Maalmi, V. Puill, A. Stocchi, E. Bagli, L. Bandiera, G. Germogli, V. Guidi, A. Mazzolari, S. Dabagov, F. Murtas, F. Addesa, G. Cavoto, F. Iacoangeli, L. Ludovici, R. Santacesaria, P. Valente, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, A.A. Durum, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, A.D. Kovalenko, A.M. Taratin, A.S. Denisov, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, L.G. Malyarenko, V.V. Skorobogatov, T. James, G. Hall, M. Pesaresi, and M. Raymond

Subjects
Accelerator, Beam collimation, Crystal, Channeling, Physics, QC1-999
Abstract

Two high-accuracy goniometers equipped with two bent silicon crystals were installed in the betatron cleaning insertion of the CERN Large Hadron Collider (LHC) during its long shutdown. First beam tests were recently performed at the LHC with 450 GeV/c and 6500 GeV/c stored proton beams to investigate the feasibility of beam halo collimation assisted by bent crystals. For the first time channeling of 6500 GeV/c protons was observed in a particle accelerator. A strong reduction of beam losses due to nuclear inelastic interactions in the aligned crystal in comparison with its amorphous orientation was detected. The loss reduction value was about 24. Thus, the results show that deflection of particles by a bent crystal due to channeling is effective for this record particle energy.

Published
2016
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4. Observation of strong leakage reduction in crystal assisted collimation of the SPS beam

Author

W. Scandale, G. Arduini, M. Butcher, F. Cerutti, M. Garattini, S. Gilardoni, A. Lechner, R. Losito, A. Masi, A. Mereghetti, E. Metral, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, P. Schoofs, G. Smirnov, E. Bagli, L. Bandiera, S. Baricordi, P. Dalpiaz, G. Germogli, V. Guidi, A. Mazzolari, D. Vincenzi, G. Claps, S. Dabagov, D. Hampai, F. Murtas, G. Cavoto, F. Iacoangeli, L. Ludovici, R. Santacesaria, P. Valente, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, A.A. Durum, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, A.D. Kovalenko, A.M. Taratin, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, J. Fulcher, G. Hall, M. Pesaresi, and M. Raymond

Subjects
Accelerator, Beam collimation, Crystal, Channeling, Physics, QC1-999
Abstract

In ideal two-stage collimation systems, the secondary collimator–absorber should have its length sufficient to exclude practically the exit of halo particles with large impact parameters. In the UA9 experiments on the crystal assisted collimation of the SPS beam a 60 cm long tungsten bar is used as a secondary collimator–absorber which is insufficient for the full absorption of the halo protons. Multi-turn simulation studies of the collimation allowed to select the position for the beam loss monitor downstream the collimation area where the contribution of particles deflected by the crystal in channeling regime but emerging from the secondary collimator–absorber is considerably reduced. This allowed observation of a strong leakage reduction of halo protons from the SPS beam collimation area, thereby approaching the case with an ideal absorber.

Published
2015
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5. Observation of nuclear dechanneling length reduction for high energy protons in a short bent crystal

Author

W. Scandale, G. Arduini, M. Butcher, F. Cerutti, M. Garattini, S. Gilardoni, L. Lari, A. Lechner, R. Losito, A. Masi, A. Mereghetti, E. Metral, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, P. Schoofs, G. Smirnov, E. Bagli, L. Bandiera, S. Baricordi, P. Dalpiaz, G. Germogli, V. Guidi, A. Mazzolari, D. Vincenzi, G. Claps, S. Dabagov, D. Hampai, F. Murtas, G. Cavoto, F. Iacoangeli, L. Ludovici, R. Santacesaria, P. Valente, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, I.A. Yazynin, A.D. Kovalenko, A.M. Taratin, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, W. Ferguson, J. Fulcher, G. Hall, M. Pesaresi, M. Raymond, D. Bolognini, S. Hasan, M. Prest, and E. Vallazza

Subjects
Physics, QC1-999
Abstract

Deflection of 400 GeV/c protons by a short bent silicon crystal was studied at the CERN SPS. It was shown that the dechanneling probability increases while the dechanneling length decreases with an increase of incident angles of particles relative to the crystal planes. The observation of the dechanneling length reduction provides evidence of the particle population increase at the top levels of transverse energies in the potential well of the planar channels. Keywords: Crystal, Channeling, Beam, Deflection

Published
2015
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6. Corrigendum to 'Observation of strong leakage reduction in crystal assisted collimation of the SPS beam' [Phys. Lett. B 748 (2015) 451–454]

Author

W. Scandale, F. Andrisani, G. Arduini, M. Butcher, F. Cerutti, M. Garattini, S. Gilardoni, A. Lechner, R. Losito, A. Masi, A. Mereghetti, E. Metral, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, P. Schoofs, G. Smirnov, E. Bagli, L. Bandiera, S. Baricordi, P. Dalpiaz, G. Germogli, V. Guidi, A. Mazzolari, D. Vincenzi, G. Claps, S. Dabagov, D. Hampai, F. Murtas, G. Cavoto, F. Iacoangeli, L. Ludovici, R. Santacesaria, P. Valente, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, A.A. Durum, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, A.D. Kovalenko, A.M. Taratin, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, J. Fulcher, G. Hall, M. Pesaresi, and M. Raymond

Subjects
Physics, QC1-999
Published
2015
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8. PRACTICAL USE OF METHODOLOGY OF QUANTITATIVE RISK ASSESSMENT 'PROBABILITY HARM RISK (PHR)' AS EXEMPLIFIED BY 'SUEK-KUZBASS' JSC

Author

'Suek' Jsc, Moscow, Russian Federation, 'Nc VostNII' Jsc, Kemerovo, Russian Federation, V.V. Lisovskiy, 'SUEK-Kuzbass\\' Jsc, Leninsk-Kuznetskiy, Russian Federation, Yu.M. Ivanov, G.E. Sedelnikov, Li Khi Un, 'Kuzbass-COT' Llc, Kemerovo, Russian Federation, and A.S. Voroshilov

Subjects
Actuarial science, Harm, Geotechnical Engineering and Engineering Geology, Risk assessment, Psychology
Published
2018
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12. Determination of diffusion lengths of minority carriers in by the EBIC method

Author

Pavel Moravec, Eduard Belas, Helmut Sitter, A.L. Tóth, P. Höschl, Yu.M. Ivanov, and Jan Franc

Subjects
Scanning electron microscope, Chemistry, Diffusion, Schottky barrier, Electron beam-induced current, Semiconductor materials, Analytical chemistry, Condensed Matter Physics, Molecular physics, Electronic, Optical and Magnetic Materials, Charge-carrier density, Vertical gradient, Materials Chemistry, Electrical and Electronic Engineering
Abstract

Diffusion lengths of minority carriers in single crystals produced by the vertical gradient freezing method were studied. Au evaporated area was used as a Schottky barrier. Electron beam induced current images in the scanning electron microscope were used for an evaluation of minority carrier diffusion lengths at 300 K in different samples.

Published
1998
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13. Growth and homogeneity region of CdTe

Author

Yu.M. Ivanov

Subjects
Chemistry, Analytical chemistry, Crystal growth, Atmospheric temperature range, Condensed Matter Physics, Microstructure, Cadmium telluride photovoltaics, Inorganic Chemistry, Crystal, Crystallography, Homogeneity (physics), Materials Chemistry, Solubility, Phase diagram
Abstract

The works concerning the data regarding solid-phase transformations in cadmium telluride are considered. On the basis of these works the region of CdTe homogeneity has been plotted. The region is characterized by Cd and Te solubility in the range of 1019–1020 cm−3 as well as availability of two-phase fields in the temperature range of solid-phase transformations. This analysis and some technological investigations resulted in conclusions about the substantial influence of composition and post-crystallization cooling of crystal on its microstructure, optical and electrical properties. These conclusions are related to high-temperature synthesis of crystals, for example, in the application of the Bridgman method.

Published
1996
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14. The influence of plasticization on the rate of forced elastic deformation of rigid chain polymer

Author

Yu.M. Ivanov

Subjects
chemistry.chemical_classification, Materials science, General Engineering, Plasticizer, Thermodynamics, Activation energy, Polymer, Rate equation, Durability, chemistry.chemical_compound, chemistry, Polymer chemistry, Empirical formula, Cellulose, Deformation (engineering)
Abstract

It has been shown experimentally for a rigid polymer (natural cellulose, modelled by wood) that the influence of plasticization on the rate of development of forced elastic deformation at a stable activation energy Eo, is manifested in the change of the δ coefficient in the deformation rate equation. The dependence of δ on plasticizer content and temperature is similar to the corresponding dependence of the structurally-sensitive coefficient γ in the durability equation and may be expressed by a n empirical formula of the same type.

Published
1985
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17. Electrical and luminescence properties of (CdZn)Te single crystals prepared by the vertical gradient freezing method

Author

Helmut Sitter, M. Zvára, Pavel Hlídek, Roman Grill, P. Höschl, Jan Franc, Eduard Belas, Yu.M. Ivanov, Pavel Moravec, and A.L. Tóth

Subjects
Electron mobility, Photoluminescence, Chemistry, Diffusion, Exciton, Analytical chemistry, Condensed Matter Physics, Acceptor, Inorganic Chemistry, Full width at half maximum, Crystallography, Materials Chemistry, Dislocation, Luminescence
Abstract

Cd 1-x Zn x Te (x = 0.04-0.1) single crystals with a diameter up to 100 mm and maximum height of 35 mm were prepared in a vertical arrangement by gradual cooling of the melt. The crystals grew in most cases in (1 1 1) orientation and they are twin-free. The average density of dislocation pits is 5 x 10 4 cm -2 . The FWHM values ranging from 25 to 8 arcsec were obtained on the (1 1 1 )A face even near the edge of the ingot. Optical transmittance reaches 63% at 10 μm in most cases. The typical single crystals are p-type with a carrier concentration in the range of 10 14 -10 16 cm -3 and mobility of 50-100 cm 2 /V s at 300 K. An important acceptor level influencing carrier concentration was found to be 140 meV above the valence band. Diffusion length of both minority electrons and holes was determined to be typically 3-10 μm. In the luminescence spectra, free and bound exciton recombination bands were resolved together with donor-and acceptor- type defect features.

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