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

Scandale, W.; Arduini, G.; Butcher, Mark; Cerutti, F.; Garattini, M.; Gilardoni, S.; Lechner, Anton; Masi, A.; Mirarchi, Daniele; Redaelli, Stefano; Rossi, Roberto; Smirnov, G.I.; Bretón, D.; Burmistrov, L.; Chaumat, V.; Dubos, S.; Maalmi, Jihane; Puill, V.; Stocchi, A.; Bagli, E.; Bandiera, L.; Germogli, G.; Guidi, V.; Mazzolari, A.; Dabagov, S.B.; Murtas, F.; Addesa, F. M.; Cavoto, G.; Iacoangeli, F.; Galluccio, F.; Afonin, A. G.; Chesnokov, Yury A.; Durum, A.; Maisheev, V. A.; Sandomirskiy, Yury; Yanovich, A.; Kovalenko, A. D.; Taratin, A.M.; Denisov, A.S.; Gavrikov, Y.; Ivanov, Y.; Lapina, L.P.; Malyarenko, L.G.; Skorobogatov, V. V.; James, T.; Hall, G.; Pesaresi, M.; Raymond, M.

doi:10.1016/j.physletb.2016.07.072

Cited by 20 publications

(16 citation statements)

References 33 publications

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“…We can notice that the relaxation length does not show the expected parabolic dependence from the radius of curvature as in Eq. (11). Instead of this one can see that starting from R ≈ 2 m l e grows with a vertical line dependence.…”

Section: Monte Carlo Simulations and Discussionmentioning

confidence: 86%

“…The third mechanism called stochastic deflection consists of the scattering of above-barrier particles in the field of bent crystal atomic strings. This mechanism was proposed in [8] and experimentally observed in [9][10][11] and [12] for positively and negatively charged particles, respectively. Recently, stochastic deflection was observed in the U-70 accelerator of the Institute for High Energy Physics (Protvino, Russia) [13].…”

Section: Introductionmentioning

confidence: 84%

“…(11) follows that the stochastic deflection mechanism gives the possibility to deflect a beam of negative particles up to the maximum angle…”

Section: Analytical Model For Stochastic Deflection Of Negative Partimentioning

confidence: 99%

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Influence of incoherent scattering on stochastic deflection of high-energy negative particle beams in bent crystals

et al. 2017

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An investigation on stochastic deflection of highenergy negatively charged particles in a bent crystal was carried out. On the basis of analytical calculation and numerical simulation it was shown that there is a maximum angle at which most of the beam is deflected. The existence of a maximum, which is taken in the correspondence of the optimal radius of curvature, is a novelty with respect to the case of positively charged particles, for which the deflection angle can be freely increased by increasing the crystal length. This difference has to be ascribed to the stronger contribution of incoherent scattering affecting the dynamics of negative particles that move closer to atomic nuclei and electrons. We therefore identified the ideal parameters for the exploitation of axial confinement for negatively charged particle beam manipulation in future high-energy accelerators, e.g., ILC or muon colliders.

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Section: Monte Carlo Simulations and Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 84%

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Influence of incoherent scattering on stochastic deflection of high-energy negative particle beams in bent crystals

et al. 2017

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“…Driven by those results, an intense experimental campaign [ 26 ] investigating the possibility to collimate or extract the proton beam circulating in the LHC was started in the late 1990 at H8 and H4 extracted lines of the SPS. New coherent interaction effects of ultra-relativistic proton beams with crystals were observed, among which were the phenomena of volume reflection [ 27 , 28 ], beam steering by means of crystal axes [ 29 – 31 ], multiple volume reflection [ 32 – 35 ] and mirroring [ 36 ]. For the first time, efficient beam steering was also recorded for both positively [ 37 – 39 ] and negatively charged particle beams [ 40 , 41 ].…”

Section: Extraction Of a Charged Particle Beam - Brief Excursusmentioning

confidence: 99%

Bent crystals for efficient beam steering of multi TeV-particle beams

et al. 2018

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Charged particle beams can be manipulated by exploiting the channeling phenomenon in bent crystals. Two plate-like crystals, bent by mechanical holders, were manufactured and characterised for such purpose at the Sensor and Semiconductor Laboratory in Ferrara, Italy. An anticlastic curvature was obtained for these crystals, achieving a steering angle of the order of 1 mrad, which is about 20 times larger than the values currently achieved for the bent crystals used in the LHC for collimation experiments. Finally, a Geant4 simulation was performed to study the channeling efficiency for beam deflection with 400 GeV/c and 7 TeV/c proton beams. Such crystals represent technological progress in the development of bent crystals for highly energetic charged particle beams. Indeed, they are designed to impart an angular kick to a 7 TeV/c proton beam with unprecedented high efficiency. Therefore, this study demonstrates the possibility of realizing bent crystals suitable for beam extraction in high-energy hadron accelerators, such as LHC or at the future FCC. A further series of studies should be conducted to evaluate the channeling efficiency and the deflection angle of the realized crystals via a charged proton beam.

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“…Planar channeling and volume reflection are used for beam collimation, extraction and splitting in particle accelerators [5]. The inelastic nuclear interaction (INI) rate in short bent crystals has been experimentally investigated in [6][7][8]. For high-energy channeled protons, INI event rate considerably smaller than for the amorphous case was reported, while an increase of the rate was preliminarily observed for volume reflection orientations.…”

Section: Introductionmentioning

confidence: 99%

Angular asymmetry of the nuclear interaction probability of high energy particles in short bent crystals

et al. 2020

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The rate of inelastic nuclear interactions in a short bent silicon crystal was precisely measured for the first time using a 180 GeV/c positive hadron beam produced in the North Experimental Area of the CERN SPS. An angular asymmetry dependence on the crystal orientation in the vicinity of the planar channeling minimum has been observed. For the inspected crystal, this probability is about ∼ 20% larger than in the amorphous case because of the atomic density increase along the particle trajectories in the angular range of volume reflection, whose dimension is determined by the crystal bending angle. Instead, for the opposite angular orientation with respect to the planar channeling, there is a smaller probability excess of ∼ 4%.

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

Cited by 20 publications

References 33 publications

Influence of incoherent scattering on stochastic deflection of high-energy negative particle beams in bent crystals

Influence of incoherent scattering on stochastic deflection of high-energy negative particle beams in bent crystals

Bent crystals for efficient beam steering of multi TeV-particle beams

Angular asymmetry of the nuclear interaction probability of high energy particles in short bent crystals

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