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1.
Bogomolov Yu. V. Alekseev V. V. Levanova O. A. Maiorov A. G. Malakhov V. V. Yazynin S. G. 《JETP Letters》2022,115(12):697-703
JETP Letters - Unfolding is currently an important stage of processing experimental data, reducing the effect of errors and reconstructing approximately real distributions of quantities. Numerous... 相似文献
2.
S. Bellucci Yu. A. Chesnokov P. N. Chirkov M. Ćosić G. Giannini V. A. Maisheev S. Petrović I. A. Yazynin 《JETP Letters》2014,98(11):649-651
The phenomenon of the deflection of a charged particle beam due to channeling in a bent crystal is thoroughly investigated and successfully applied for the extraction of the beam in high-energy accelerators, at the energies of about 10 GeV and higher. However, a big practical interest lies in the task of bending and extracting charged particles with energies below 1 GeV, for example, for the production of ultrastable beams of low emittance for medical and biological applications. That is why a novel crystal technique, namely thin straight crystal targets, is investigated in this article, using crystals as elements for extraction and collimation of the circulating beam in a ring accelerator. The advantages of reflection in straight crystals in comparison with bent crystal channeling consist in the small length of straight crystals along the beam that reduces the amount of nuclear interactions and improves the background. Experimental results were obtained for the bending of a 100 MeV positron beam with using five sequential straight crystals. 相似文献
3.
A. G. Afonin V. T. Baranov M. K. Bulgakov I. S. Voinov V. N. Gorlov I. V. Ivanova D. M. Krylov A. N. Lun’kov V. A. Maisheev S. F. Reshetnikov D. A. Savin E. A. Syshchikov V. I. Terekhov Yu. A. Chesnokov P. N. Chirkov I. A. Yazynin 《JETP Letters》2011,93(4):187-190
The possibilities of the extraction and collimation of a circulating beam by a new method due to the reflection of particles in crystals with axial orientation were experimentally investigated in the Fall 2010 run at the U-70 synchrotron. Such crystals have positive features, because the axial potential is five times larger than the planar potential. It has been shown that the collimation efficiency can reach 90% due to axial effects in the crystal. Losses of the circulating beam on a collimator have been reduced by several times; this makes it possible to suppress the muon jet near the steel collimator of the circulating beam. 相似文献
4.
V. A. Maisheev Yu. A. Chesnokov P. N. Chirkov I. A. Yazynin D. Bolognini S. Hasan M. Prest E. Vallazza 《Journal of Experimental and Theoretical Physics》2016,122(5):802-812
Emission by 120-GeV positrons in the channeling regime in the (011) plane of a silicon single crystal has been considered. Trajectories of positrons under different initial conditions have been calculated within the theory of nonlinear oscillations. The amplitude distribution function of channeled particles has been determined taking into account the nonlinearity of their motion. The intensity of radiation under various initial conditions has been calculated by two different methods. These results can be useful for comparison with experimental data at energies of positrons beginning with 100 GeV and higher. 相似文献
5.
W. Scandale A. Vomiero E. Bagli S. Baricordi P. Dalpiaz M. Fiorini V. Guidi A. Mazzolari D. Vincenzi R. Milan Gianantonio Della Mea E. Vallazza A.G. Afonin Yu.A. Chesnokov V.A. Maisheev I.A. Yazynin V.M. Golovatyuk 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.A. Vavilov D. Bolognini S. Hasan M. Prest 《Physics letters. [Part B]》2010
Different kinds of deflection in a silicon crystal bent along the 〈111〉 axis was observed for 150 GeV/c negative particles, mainly π− mesons, at one of the secondary beams of the CERN SPS. The whole beam was deflected to one side in quasi-bound states of doughnut scattering (DSB) by atomic strings with the efficiency (95.4 ± 0.2)% and with the peak position close to the bend crystal angle, α=185 μrad. It was observed volume capture of π− mesons into the DSB states with a probability higher than 7%. A beam deflection opposite to the crystal bend was observed for some orientations of the crystal axis due to doughnut scattering and subsequent multiple volume reflections of π− mesons by different bent planes crossing the axis. 相似文献
6.
Scandale W Vomiero A Baricordi S Dalpiaz P Fiorini M Guidi V Mazzolari A Della Mea G Milan R Ambrosi G Bertucci B Burger WJ Zuccon P Cavoto G Luci C Santacesaria R Valente P Vallazza E Afonin AG Chesnokov YA Maisheev VA Yazynin IA Kovalenko AD Taratin AM Denisov AS Gavrikov YA Ivanov YM Lapina LP Malyarenko LG Skorobogatov VV Suvorov VM Vavilov SA Bolognini D Hasan S Mozzanica A Prest M 《Physical review letters》2008,101(16):164801
Beam deflection due to axial channeling in a silicon crystal bent along the 111 axis was observed with 400 GeV/c protons at the CERN Super Proton Synchrotron. The condition for doughnut scattering of protons by the atomic strings of the crystal was attained. Such a condition allowed one to observe a beam deflection of 50 murad with about 30% efficiency. The contribution of hyperchanneled states of protons to the observed beam deflection was less than 2% according to simulation results. 相似文献
7.
A. G. Afonin V. I. Baranov V. T. Baranov G. I. Britvich A. P. Bugorskii M. K. Bulgakov A. A. Durum I. S. Lobanov A. N. Lun’kov A. V. Lutchev V. A. Maisheev Yu. E. Sandomirskii A. V. Skleznev Yu. A. Chesnokov P. N. Chirkov I. A. Yazynin A. A. Yanovich 《JETP Letters》2012,96(7):424-426
Bent crystals are used at large accelerators to deflect particle beams for extraction and collimation. Not only the deflection but also the focusing of beams by bent crystals can be required for recently formulated proposals for investigations at the Large Hadron Collider (LHC) with a fixed target. The experimental results on the focusing of a 50-GeV proton beam with a new crystal device, which can be used in a circulating beam of a large accelerator such as the LHC, have been reported. 相似文献
8.
Chesnokov M. Yu. Chesnokov Yu. A. Maisheev V. A. Sandomirskiy Yu. E. Yanovich A. A. Yazynin I. A. 《JETP Letters》2020,111(1):1-7
JETP Letters - The famous Balitsky-Fadin-Kuraev-Lipatov (BFKL) equation was derived using the hypothesis that amplitudes of non-abelian gauge theories with the adjoint representation of the gauge... 相似文献
9.
A. A. Arkhipenko A. G. Afonin V. T. Baranov G. I. Britvich V. I. Kotov V. A. Maisheev A. V. Maksimov S. F. Reshetnikov V. N. Chepegin Yu. A. Chesnokov I. A. Yazynin 《JETP Letters》2008,88(4):229-231
The measurements of the efficiency of the extraction of protons from the U-70 accelerator with the use of silicon crystals with bending angles of 36 and 64 mrad are reported. The data are confirmed by computer simulation. Proposals are made on the use of several crystals for the extraction of particles from the U-70 accelerator in the carbon ion acceleration mode. 相似文献
10.
It has been shown that the use of a bent crystal with a variable curvature radius makes it possible to reduce the fraction
of dechanneled particles by an order of magnitude. This effect enables the strong reduction of the particle density at the
edge of a collimator or the partition of a septum upon the multi-turn extraction of a beam from a ring accelerator. In particular,
the beam extraction efficiency at the U-70 synchrotron and Large Hadron Collider can be increased to 95 and 99.65%, respectively. 相似文献