Y. A. Chesnokov

Publications (9)7.37 Total impact

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  Available from: P. N. Chirkov

  Article: Channeling Radiation of Positrons with Energy in the Region of 100 GeV in Single Crystals

  V. A. Maisheev, Y. A. Chesnokov, P. N. Chirkov, I. A. Yazynin, D. Bolognini, S. Hasan, M Prest, E Vallazza
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  ABSTRACT: The process of radiation of 120-GeV positrons moving in a channeling regime in (011) plane of a single crystal was considered. At the beginning on the basis of the theory of nonlinear oscillations the trajectory of moving positrons at different initial conditions were derived. Then taking into account the nonlinearity of motion the distribution function over oscillation amplitudes of channeling particles was found. After this the intensity of radiation at different initial conditions was calculated with the help of two various methods. These results may be useful for comparison with experimental data at positron energies from 100 and more GeV.
  02/2011;
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  Available from: Valery Biryukov

  Conference Proceeding: Creating microbeams and nanobeams by channeling in micro- and nano-structures

  V.M. Biryukov, Y.A. Chesnokov, S. Bellucci, V. Guidi, W. Scandale
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  ABSTRACT: A particle beam of very small cross-section is useful in many accelerator applications including biological and medical ones. We show the capability of channeling technique using a micron-sized structure on a surface of a single crystal, or using a nanotube, to produce beam of a cross-section down to 1 square micrometer (or nanometer). The channeled beam can be deflected and well separated in angle and space from the primary and scattered particles. According to our Monte Carlo simulations of channeling and experience with crystal channeling at IHEP (Protvino), emittances down to 0.1-0.001 nanometer-radian, and flux up to 1 million ions per square micron per second, can be achieved for protons and ions in the range 0.1-3 GeV/u. We discuss the experimental techniques to achieve suitable structures for particle beam channeling.
  Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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  Available from: Valery Biryukov

  Article: The Investigations Of Beam Extraction And Collimation At U-70 Proton Synchrotron Of IHEP By Using Short Silicon Crystals

  A. G. Afonine, V. T. Baranov, V. M. Biryukov, V. N. Chepegin, Y. A. Chesnokov, Y. S. Fedotov, V. I. Kotov, V. A. Maisheev, V. I. Terekhov, E. F. Troyanov, A Drees, D. Trbojevic, W. Scandale, M. B. H. Breese, V. Guidi, G Martinelli, M. Stefancich, D. Vincenzi
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  ABSTRACT: The new results of using short (2-4mm) bent crystals for extraction and collimation of proton beam at IHEP 70 Gev proton synchrotron are reported. A broad range of energies from 6 to 65 GeV has been studied in the same crystal collimation set-up. The efficiency of extraction more than 85% and intensity more than 10E12 were obtained by using crystal with the length 2-mm and the angle 1 mrad. The new regime of extraction is applied now at the accelerator to deliver the beam for different experimental setups within the range of intensity 10E7-10E12ppp.
  08/2002;
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  Available from: Valery Biryukov

  Article: Application of bent crystals at IHEP 70-GeV accelerator to enhance the efficiency of its usage

  V. I. Kotov, A. G. Afonin, V. M. Biryukov, Y. A. Chesnokov, N. A. Galyaev, V. N. Gres, V. A. Maisheev, V. A. Medvedev, A. V. Minchenko, V. I. Terekhov, E. F. Troyanov, Y. S. Fedotov, V. N. Zapolsky, B. A. Zelenov, Y M Ivanov, W. Scandale
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  ABSTRACT: Bent crystal was extracting 70-GeV protons with average intensity 4*10^11 (as measured in external beamline) per spill of 1.6 s duration, in parallel to the simultaneous work of two internal targets in the accelerator ring. An additional crystal, placed in the external beamline, was deflecting a small part of the extracted beam with intensity 10^7 protons toward another physics experiment. Crystal-extracted beam had a typical size of 4 mm by 4 mm fwhm at the end of the external beamline. Measurements for the extraction efficiency and other characteristics at the simultaneous work of four experimental set-ups are presented. With crystal working in the above-said regime during one month, no degradation of channeling was observed. The studies of extraction efficiency have been continued with new crystals.
  12/2001;
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  Available from: Valery Biryukov

  Article: High-efficiency beam extraction and collimation using channeling in very short bent crystals.

  A G Afonin, V T Baranov, V M Biryukov, M B Breese, V N Chepegin, Y A Chesnokov, V Guidi, Y M Ivanov, V I Kotov, G Martinelli, W Scandale, M Stefancich, V I Terekhov, D Trbojevic, E F Troyanov, D Vincenzi
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  ABSTRACT: 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 of approximately 10(12) protons directed towards crystals of approximately 2 mm length in spills of approximately 2 s duration. The experimental data follow very well the prediction of Monte Carlo simulations. This demonstration is important in devising a more efficient use of the U-70 accelerator in Protvino and provides crucial support for implementing crystal-assisted slow extraction and collimation in other machines, such as the Tevatron, RHIC, the AGS, the SNS, COSY, and the LHC.
  Physical Review Letters 09/2001; 87(9):094802. · 7.37 Impact Factor
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  Available from: Valery Biryukov

  Conference Proceeding: Progress in study of efficient crystal extraction and collimation at IHEP

  A.G. Afonin, V.T. Baranov, V.M. Biryukov, V.N. Chepegin, Y.A. Chesnokov, Y.S. Fedotov, V.I. Kotov, V.I. Terekhov, E.F. Troyanov, Y.M. Ivanov, W. Scandale, D. Vincenzi
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  ABSTRACT: The radical efficiency increase of accelerator beam extraction by means of bent crystals is reached by reducing the longitudinal dimension and bending angle of crystals. The usage of short crystals results in reduction of dechanneling losses and in increase of average number of crystal crossings by the particles. Both factors allowed an increased 70 GeV beam extraction efficiency of more than 80% which was proved experimentally and is in a good agreement with theoretical predictions. The feasibility of the crystal efficiency at injection energies (1.3 GeV) is demonstrated as well
  Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001; 02/2001
• Conference Proceeding: Optimization of the parameters in the RHIC single crystal heavy ion collimation

  V.M. Biryukov, Y.A. Chesnokov, V.I. Kotov, D. Trbojevic, A. Stevens
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  ABSTRACT: In the framework of the project to design and test a collimation system prototype using a bent channeling crystal for cleaning of the RHIC heavy ion beam halo, we have studied the optimal length and bending angle of a silicon (110) single crystal proposed to be a primary element situated upstream of the traditional heavy amorphous collimator. Besides the matters of the channeling and collimation efficiency, we also looked into the impact the crystal may have on the non-channeled particles that go on circulating in the ring, so as to reduce the momentum offset of the particles scattered of the crystal
  Particle Accelerator Conference, 1999. Proceedings of the 1999; 02/1999
• Conference Proceeding: New projects of crystal extraction at IHEP 70 GeV accelerator

  A.G. Afonin, V.M. Biryukov, V.N. Chepegin, Y.A. Chesnokov, V.I. Kotov, V.I. Terekhov, E.F. Troyanov, Yu.S. Fedotov
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  ABSTRACT: Using channeling in a 5-mm crystal with bending angle of 0.65 mrad, a record high efficiency, over 60%, of particle extraction from the accelerator was achieved. The extracted beam intensity was up to 5.2×10¹¹ protons per spill of ~0.5 s duration. Also, the first proof-of-principle experiment on `crystal collimation' was performed where crystal-serving as a scraper-has reduced the radiation level in the accelerator by a factor of two. The measurements agree with Monte Carlo predictions
  Particle Accelerator Conference, 1999. Proceedings of the 1999; 02/1999
• Conference Proceeding: Bent single crystals to form high energy particle beams

  N.A. Galyaev, V.N. Zapol'sky, V.I. Kotov, S.V. Tsarik, Y.A. Chesnokov
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  ABSTRACT: The idea of deflecting high-energy particles with the help of bent single crystals has been widely applied at the IHEP complex for beam forming. Results of work with the crystals used in the extracted beams are presented.< >
  Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE; 06/1991