V. V. Skorobogatov
Petersburg Nuclear Physics Institute
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Featured researches published by V. V. Skorobogatov.
Physical Review Letters | 2003
S. Bellucci; S. Bini; V.M. Biryukov; Yu.A. Chesnokov; S. Dabagov; G. Giannini; V. Guidi; Yu.M. Ivanov; V. I. Kotov; V. A. Maisheev; C. Malagù; G. Martinelli; A. A. Petrunin; V. V. Skorobogatov; Marco Stefancich; D. Vincenzi
We present an idea for creation of a crystalline undulator and report its first realization. One face of a silicon crystal was given periodic microscratches (grooves) by means of a diamond blade. The x-ray tests of the crystal deformation due to a given periodic pattern of surface scratches have shown that a sinusoidal-like shape is observed on both the scratched surface and the opposite (unscratched) face of the crystal; that is, a periodic sinusoidal-like deformation goes through the bulk of the crystal. This opens up the possibility for experiments with high-energy particles channeled in a crystalline undulator, a novel compact source of radiation.
Jetp Letters | 2005
Yu.M. Ivanov; A. A. Petrunin; V. V. Skorobogatov
A considerable elastic quasi-mosaicity effect has been observed upon the diffraction of x-rays on a bent silicon single-crystal plate. It has been shown that the effect depends on the choice of reflecting crystallographic planes and the orientation of the plate cut. The effect can be applied to improve the characteristics of silicon single-crystal monochromators of electromagnetic radiation and silicon single-crystal deflectors of charged-particle beams.
Physics Letters B | 1998
A. G. Afonin; A. A. Arkhipenko; V.I. Baranov; V.M. Biryukov; Yu.A. Chesnokov; V. A. Gavrilushkin; V. N. Gres; V. I. Kotov; V. A. Maisheev; A. V. Minchenko; V. I. Terekhov; E. F. Troyanov; V.A Zelenov; B. A. Chunin; A. S. Denisov; M. G. Gordeeva; Yu.M. Ivanov; A. A. Petrunin; V. V. Skorobogatov
Abstract Using channeling in a 5-mm crystal with a bending angle of 1.5 mrad, a radical increase in the efficiency of beam extraction from accelerator was achieved due to an increased number of particle encounters with crystal. The measured world-highest efficiency of crystal extraction, over 40%, is in good agreement with theory predictions. The extracted beam intensity of 6×1011 ppp was obtained, five orders of magnitude higher than previous results.
Jetp Letters | 1998
A. G. Afonin; V.M. Biryukov; V. A. Gavrilushkin; V. N. Gres; B. A. Zelenov; V. I. Kotov; V. A. Maisheev; A. V. Minchenko; V. N. Terekhov; E. F. Troyanov; Yu.A. Chesnokov; M. G. Gordeeva; A. S. Denisov; Yu. M. Ivanov; A. A. Petrunin; V. V. Skorobogatov; B. A. Chunin
A radical increase in the efficiency of beam extraction from an accelerator is achieved with a short (7 mm long) crystal bent by a small angle (1.7 mrad) by increasing the number of times particles pass through the crystal. A particle extraction efficiency of ~20%, in agreement with the prediction of the theory, was achieved experimentally. A record high intensity of the extracted beam 1.9×1011 protons per cycle, which is four orders of magnitude higher than previous results, is obtained.
Jetp Letters | 2006
Yu.M. Ivanov; N. F. Bondar; Yu.A. Gavrikov; A. S. Denisov; A. V. Zhelamkov; V. G. Ivochkin; S. V. Kos’yanenko; L.P. Lapina; A. A. Petrunin; V. V. Skorobogatov; V.M. Suvorov; A. I. Shchetkovsky; A.M. Taratin; W. Scandale
The volume reflection of 1-GeV protons by a bent crystal has been observed. The crystal is made of single crystal silicon. The (111) atomic planes are bent owing to the elastic quasimosaicity effect, which makes it possible to reduce the crystal length for a beam to 30 µm. It is found that the probability of the reflection effect is higher than the probability of the channeling effect (0.71 vs. 0.63), and the deflection angle of the protons reflected inside the crystal is equal to 1.39 ± 0.04 in terms of the critical angle for channeling under the conditions of the experiment (170 µrad). The width of the reflected peak is equal to 1.76 ± 0.04 in the same units. The protons that are not involved in channeling at the angular position of maximum channeling undergo volume reflection and are deflected in the direction opposite to the channeled beam by the angle 1.01 ± 0.05 in terms of the critical angle for channeling. The width of the reflected peak is equal to 1.94 ± 0.08 in the same units.
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1992
A. S. Denisov; O.L. Fedin; M.A. Gordeeva; M. P. Gur'ev; Yu.P. Platonov; A.I. Schetkovsky; V. V. Skorobogatov; A.I. Smirnov; V.I. Baranov; Yu.A. Chesnokov; V.V. Dudenko; N.A. Galyaev; V. I. Kotov; S.V. Tsarik; V.N. Zapolsky
Abstract The technique of beam focusing by a bent crystal is described and results from its application presented in this note. A 70 GeV 2 mm wide proton beam was deflected and focused into a narrow 200 μm wide strip.
bipolar/bicmos circuits and technology meeting | 2003
S. Bellucci; S. Bini; G. Giannini; V.M. Biryukov; G. I. Britvich; Yu.A. Chesnokov; V. I. Kotov; V. A. Maisheev; V. A. Pikalov; V. Guidi; C. Malagù; G. Martinelli; Marco Stefancich; D. Vincenzi; Yu.M. Ivanov; A. A. Petrunin; V. V. Skorobogatov; F. Tombolini
A crystalline undulator (CU) with periodically deformed crystallographic planes is capable of deflecting charged particles with the same strength as an equivalent magnetic field of 1000 T and could provide quite a short period L in the sub-millimeter range. We present an idea for creation of a CU and report its first realization. One face of a silicon crystal was given periodic micro-scratches (grooves), with a period of 1 mm, by means of a diamond blade. The X-ray tests of the crystal deformation have shown that a sinusoidal-like shape of crystalline planes goes through the bulk of the crystal. This opens up the possibility for experiments with high-energy particles channeled in CU, a novel compact source of radiation. The first experiment on photon emission in CU has been started at LNF with 800 MeV positrons aiming to produce 50 keV undulator photons.
EPL | 2011
W. Scandale; Alberto Vomiero; E. Bagli; S. Baricordi; P. Dalpiaz; M. Fiorini; V. Guidi; A. Mazzolari; D. Vincenzi; Riccardo Milan; G. Della Mea; E. Vallazza; A. G. Afonin; Yu.A. Chesnokov; V. A. Maisheev; I. A. Yazynin; A. D. Kovalenko; A.M. Taratin; A. S. Denisov; Yu.A. Gavrikov; Yu.M. Ivanov; L.P. Lapina; L. G. Malyarenko; V. V. Skorobogatov; V.M. Suvorov; S. Vavilov; D. Bolognini; S. Hasan; A. Mattera; M. Prest
Multiple volume reflection by different planes passing through the 〈111〉 axis in a bent silicon crystal was observed for the first time for 150 GeV/c negative particles, π- mesons, at one of the se ...
arXiv: Accelerator Physics | 2006
V.M. Biryukov; A. G. Afonin; V. T. Baranov; S. Baricordi; S. Bellucci; G. I. Britvich; V. N. Chepegin; Yu.A. Chesnokov; C. Balasubramanian; G. Giannini; V. Guidi; Yu.M. Ivanov; V. I. Kotov; A. Kushnirenko; V. A. Maisheev; C. Malagù; G. Martinelli; E. Milan; A. A. Petrunin; V. A. Pikalov; V. V. Skorobogatov; Marco Stefancich; V. I. Terekhov; F. Tombolini; U.I. Uggerhøj
A series of Silicon crystal undulator samples were produced based on the approach presented in PRL 90 (2003) 034801, with the periods of undulation from 0.1 mm to 1 mm, and the number of periods on the order of 10. The samples were characterized by X-rays, revealing the sine-like shape of the crystal lattice in the bulk. Next step in the characterization has been the channeling tests done with 70 GeV protons, where good channeling properties of the undulated Silicon lattice have been observed. The photon radiation tests of crystal undulators with high energy positrons are in progress on several locations: IHEP Protvino, LNF Frascati, and CERN SPS. The progress in the experimental activities and the predictions from detailed simulations are reported.
Jetp Letters | 1998
A. G. Afonin; V.M. Biryukov; V. A. Gavrilushkin; V. N. Gres; B. A. Zelenov; V. I. Kotov; V. A. Maisheev; A. V. Minchenko; V. I. Terekhov; E. F. Troyanov; Yu.A. Chesnokov; M. G. Gordeeva; A. S. Denisov; Yu. M. Ivanov; A. A. Petrunin; V. V. Skorobogatov; B. A. Chunin
A record-high particle extraction efficiency, exceeding 40%, in agreement with theoretical predictions, is achieved using a short (5 mm long) crystal bent by 1.5 mrad. An extracted beam intensity of ∼6×1011 protons per cycle is obtained. This is five to six orders of magnitude higher than previous results.