On the influence of scattering on atomic strings on the stability of planar channeling of high-energy positively charged particles

Kyryllin, I. V.; Шульга, Н.Ф.

doi:10.1088/1748-0221/13/02/c02020

Cited by 5 publications

(3 citation statements)

References 9 publications

(13 reference statements)

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“…1 (which is averaged with respect to impact parameters) and its two-humped structure. This study was carried out using numerical simulation of charged particles motion in oriented crystal, the principle of which is described in [14][15][16][17]. The simulation was carried out for 150 GeV/c   mesons that pass through the silicon crystal of 1 mm thickness in the regime of planar channeling in (110) atomic planes.…”

Section: Impact Parameter Dependence Of the Ionization Energy Loss Di...mentioning

confidence: 99%

On the Impact Parameter Dependence of the Ionization Energy Loss of Fast Negatively Charged Particles in an Oriented Crystal

Trofymenko

Kyryllin

Shchus

2021

EEJP

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When a fast charged particle passes through matter, it loses some of its energy to the excitation and ionization of atoms. This energy loss is called ionization energy loss. In rather thin layers of matter, the value of such energy loss is stochastic. It is distributed in accordance with the law, which was first received by L.D. Landau. In amorphous substances, such a distribution (or spectrum), known as the Landau distribution, has a single maximum that corresponds to the most probable value of particle energy loss. When a particle moves in crystal in a planar channeling mode, the probability of close collisions of the particle with atoms decreases (for a positive particle charge) or increases (for a negative charge), which leads to a change in the most probable energy loss compared to an amorphous target. It has recently been shown that during planar channeling of negatively charged particles in a crystal, the distribution of ionization energy loss of the particles is much wider than in the amorphous target. In this case, this distribution can be two-humped, if we neglect the incoherent scattering of charged particles on the thermal oscillations of the crystal atoms and the electronic subsystem of the crystal. This paper explains the reason for this distribution of ionization energy loss of particles. The ionization energy loss distribution of high-energy negatively charged particles which move in the planar channeling mode in a silicon crystal are studied with the use of numerical simulation. The dependence of this distribution on the impact parameter of the particles with respect to atomic planes is considered. The dependence of the most probable ionization energy loss of particles on the impact parameter is found. It is shown that, for a large group of particles, the most probable ionization energy loss during planar channeling in a crystal is lower than in an amorphous target.

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Section: Impact Parameter Dependence Of the Ionization Energy Loss Di...mentioning

confidence: 99%

On the Impact Parameter Dependence of the Ionization Energy Loss of Fast Negatively Charged Particles in an Oriented Crystal

Trofymenko

Kyryllin

Shchus

2021

EEJP

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“…The trajectories of positrons were found using numerical simulation of particle motion in the field of crystal atomic strings. The code was the same as in [10][11][12]. The computes the trajectory of a high-energy charged particle in the field of continuous atomic string potential in the Doyle-Turner approximation through numerical integration of the equation of motion.…”

Section: Jinst 15 C07019mentioning

confidence: 99%

On the influence of periodicity in the arrangement of crystalline atomic strings upon the spectral and spectral-angular distribution of high-energy positively charged particle radiation in crystal

Kyryllin¹,

Шульга²

2020

J. Inst.

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Spectral and spectral-angular distribution of the radiated energy in case of positron motion in an oriented crystal and in case of positron motion in the field of randomly located atomic strings (random strings approximation) when the angle between particle momentum and crystal axes is less than the critical angle of axial channeling were calculated. Obtained results showed that the peak in the emission spectrum is related to the quasi-regular motion of the above-barrier positrons in planar channels.

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“…The fact that positively charged particles, when moving at a small angle to atomic strings or planes, do not come too close to the atoms leads to the fact that stable modes of motion (planar and axial channeling) for positively charged particles in an oriented crystal are significantly more resistant to incoherent scattering of particles on thermal atomic vibrations than in the case of negatively charged particles which are attracted by atomic nuclei. That is why oriented crystals, including bent ones, have recently been more often used to deflect the direction of motion of positively charged particles [3][4][5][6][7][8][9][10][11][12][13][14][15]. The process of passage of negatively charged particles through oriented crystals is more difficult to describe.…”

Section: Introductionmentioning

confidence: 99%

Diffusion of High-Energy Negatively Charged Particles in the Field Atomic Strings of an Oriented Crystal

Kyryllin,

Shul’ga,

Shchus

2023

East Eur. J. Phys.

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The work analyzes the dependence of the diffusion index of high-energy negatively charged particles on the energy of the transverse motion in oriented crystal. The crystal had an axial orientation relative to the direction of particle incidence. The analysis was carried out using the example of π− mesons with a momentum of 100 GeV/c that impinged on a silicon crystal, which corresponds to the conditions achievable on secondary beam of the the CERN SPS accelerator. The analysis showed that the dependence under consideration is not monotonic. It has a minimum in the energy region slightly exceeding the value of the potential energy of particles at the saddle point of the potential of crystal atomic strings. At higher values of the energy of transverse motion of particles E⊥, the diffusion index increases with increasing E⊥, since this increases the average absolute value of the velocity of particle motion in the plane orthogonal to the crystal axis, near which motion takes plase. The increase in the diffusion index at low values of E⊥ is associated with the manifestation of incoherent scattering of particles on thermal vibrations of crystal atoms. The analysis carried out in the work is of interest both for a deeper understanding of the process of high-energy negatively charged particle beams passage through oriented crystals, and for improving methods for charged particle beams steering with a help of straight and bent oriented crystals.

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On the influence of scattering on atomic strings on the stability of planar channeling of high-energy positively charged particles

Cited by 5 publications

References 9 publications

On the Impact Parameter Dependence of the Ionization Energy Loss of Fast Negatively Charged Particles in an Oriented Crystal

On the Impact Parameter Dependence of the Ionization Energy Loss of Fast Negatively Charged Particles in an Oriented Crystal

On the influence of periodicity in the arrangement of crystalline atomic strings upon the spectral and spectral-angular distribution of high-energy positively charged particle radiation in crystal

Diffusion of High-Energy Negatively Charged Particles in the Field Atomic Strings of an Oriented Crystal

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