First results of experiments on high-efficiency single-crystal extraction of protons from the U-70 accelerator

Afonin, A. G.; Biryukov, V.M.; Gavrilushkin, V. A.; Gres, V. N.; Zelenov, B.A.; Kotov, V.I.; Maisheev, V. A.; Minchenko, A. V.; Terekhov, V. N.; Troyanov, E. F.; Chesnokov, Yu. A.; Gordeeva, M. G.; Denisov, A.S.; Ivanov, Yu. M.; Petrunin, A.; Skorobogatov, V. V.; Chunin, B. A.

doi:10.1134/1.567748

Cited by 46 publications

(32 citation statements)

References 7 publications

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“…Only recently, SD was experimentally observed for either positively [14] or negatively [15] charged particles, owing to the advent of a new generation of bent crystals [16,17], short enough to efficiently deflect high-energy particles up to the nominal bending angle of the crystal.…”

Section: Introductionmentioning

confidence: 99%

Relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal

et al. 2016

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An investigation on the mechanism of relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal was carried out at the extracted line H8 from CERN Super Proton Synchrotron. The experimental results were critically compared to computer simulations, showing a good agreement. We identified a necessary condition for the exploitation of axial confinement or its relaxation for particle beam manipulation in high-energy accelerators. We introduce the idea of using a short bent crystal, aligned with one of its main axis to the beam direction, as a beam steerer or a beam splitter with adjustable intensity in the field of particle accelerators. In particular, in the latter case, a complete relaxation from axial confinement to planar channeling takes place, resulting in beam splitting into the two strongest skew planar channels.

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Section: Introductionmentioning

confidence: 99%

Relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal

et al. 2016

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“…Results concerning one quasi-mosaic silicon crystal, produced and bent as described in [16], and six strip silicon crystals produced and bent with the method described in [17][18][19][20] are reported here.…”

Section: Experimental Measurementsmentioning

confidence: 99%

Study of inelastic nuclear interactions of 400 GeV/c protons in bent silicon crystals for beam steering purposes

et al. 2018

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Inelastic nuclear interaction probability of 400 GeV/c protons interacting with bent silicon crystals was investigated, in particular for both types of crystals installed at the CERN Large Hadron Collider for beam collimation purposes. In comparison to amorphous scattering interaction, in planar channeling this probability is ∼ 36% for the quasimosaic type (planes (111)), and ∼ 27% for the strip type (planes (110)). Moreover, the absolute inelastic nuclear interaction probability in the axial channeling orientation, along the 110 axis, was estimated for the first time, finding a value of 0.6% for a crystal 2 mm long along the beam direction, with a bending angle of 55 µrad. This value is more than two times lower with respect to the planar channeling orientation of the same crystal, and increases with the vertical angular misalignment. Finally, the correlation between the inelastic nuclear interaction probability in the planar channeling and the silicon crystal curvature is reported.

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“…The key factors which lead to spread of this technology in worldwide accelerators were the increasing of channeling efficiency and the discovery of the VR effect, both achieved thanks to the advent of innovative crystal manufacturing processes [12][13][14] and geometries [15][16][17]. A high steering efficiency, both with channeling ($80%) and VR (more than 95%), was obtained with positive particles [18,19], while, comparatively, very little has been achieved concerning steering of negatively charged particle beams in bent crystals [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Manufacturing and characterization of bent silicon crystals for studies of coherent interactions with negatively charged particles beams

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et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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First results of experiments on high-efficiency single-crystal extraction of protons from the U-70 accelerator

Cited by 46 publications

References 7 publications

Relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal

Relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal

Study of inelastic nuclear interactions of 400 GeV/c protons in bent silicon crystals for beam steering purposes

Manufacturing and characterization of bent silicon crystals for studies of coherent interactions with negatively charged particles beams

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