On the electromagnetic radiation of channeled particles in a curved crystal

Kaplin, V. V.; Vorobiev, S.A.

doi:10.1016/0375-9601(78)90044-0

Cited by 27 publications

(19 citation statements)

References 4 publications

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“…The centrifugal term leads to the inclination of the effective potential and to the reduction of the outer wall in each channel. This effect, in turn, decreases the critical channeling angle, the capture probability P c of particles into the channeling regime and the dechanneling length L d [2][3][4]. The potential well fully disappears and the channeling regime is no longer possible, when the bend radius R is equal or smaller than R c .…”

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confidence: 99%

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Volume Reflection Dependence of400 GeV/cProtons on the Bent Crystal Curvature

Scandale¹,

Vomiero²,

Baricordi³

et al. 2008

Phys. Rev. Lett.

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The trend of volume reflection parameters (deflection angle and efficiency) in a bent (110) silicon crystal has been investigated as a function of the crystal curvature with 400 GeV/c protons on the H8 beam line at the CERN Super Proton Synchrotron. This Letter describes the analysis performed at six different curvatures showing that the optimal radius for volume reflection is approximately 10 times greater than the critical radius for channeling. A strong scattering of the beam by the planar potential is also observed for a bend radius close to the critical one.

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“…The transverse motion of a channeled particle in a bent crystal is governed by the effective potential [2] U ef ðx; F c Þ ¼ UðxÞ þ F c x, where F c ¼ pv=R is the centrifugal force and the x coordinate is measured in the direction opposite to the radial one (Fig. 1).…”

mentioning

confidence: 99%

Volume Reflection Dependence of400 GeV/cProtons on the Bent Crystal Curvature

Scandale¹,

Vomiero²,

Baricordi³

et al. 2008

Phys. Rev. Lett.

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“…I n order to design the original instruments for steering a charged particle beam, e.g., the crystalline septa [lo], the deflection efficiency should be analyzed in the way similar to the above consideration of the optimum radius for the crystal bending. I n conclusion it should be noted that side by side with the deflection of charged particles the bent crystals should provide the formation of polarized beams in the channeling conditions [ll] and the generation of quasi-synchrotron radiation in bent crystals [3] with changing frequency in the X-ray and ultraviolet regions.…”

Section: Resultsmentioning

confidence: 99%

“…I n the general case the efficiency of proton deflection will be determined by the efficiency of particle capture in the curved channel, which was shortly considered in [3], and by the dechanneling velocity. For a unidirectional particle beam the efficiency of proton capture into a planar channel may be given as Pc(R) == 1 -x0(R)/Z.…”

Section: Efficiency Of Proton Beam Deflection By Bent Crystalsmentioning

confidence: 99%

“…At the bending radii R 2 lOR,, where R, is the critical radius, about 90% of the incident protons remain captured in the planar channel [3,4]. However, the estimation of the real efficiency of the deflection of particles by a bent crystal requires to take into account the dechanneling of particles due to multiple scattering on crystal electrons and nuclei.…”

Section: Introductionmentioning

confidence: 99%

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Theory of Planar Channeling of Relativistic Protons in Bent Crystals

Taratin

Filimonov

Vyatkin

et al. 1980

Physica Status Solidi (b)

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Dechanneling of relativistic protons in planar channels of bent crystals is examined on the basis of the Fokker-Planck equation. The dependence of the dechanneling half-length x 1 p in a curved channel of (110) Si on the particle energy E and the bending radius R is found. It is shown that in the bent crystal the dechanneling lengths are considerably reduced and the proportionality between the x1/2 value and the particle energy E is violated. The optimum conditions for deflection of a proton beam a t the definite angle by a bent crystal are considered. PaccMaTpHsaeTcR neKaHanHpoBaHHe penmmHcTcK~x IIPOTOHOB B nnocKocTHbIx IcaHajIax nonyronmtiabr neKaHannposaHm x l / e B M~O~H Y T O M (110) Si OT 3~e p r m sacmq E EI

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Radiation of Channeled Particles in Deformed Crystals

Kaplin

Плотніков

Vorobiev

1980

Physica Status Solidi (b)

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Recently the radiation of relativistic electrons and positrons, arising under channeling in single crystals, was successfully observed /1, 2/. The radiation occupied the hard X-ray region at the GeV energy of channeled particles with the peak spectral density about two o r d e r s of magnitude l a r g e r than the spectral density in the case of bremsstrahlung from the amorphous target.Such an X-ray source is of a great interest for irradiation technology of materials and solid state physics.

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On the electromagnetic radiation of channeled particles in a curved crystal

Cited by 27 publications

References 4 publications

Volume Reflection Dependence of400 GeV/cProtons on the Bent Crystal Curvature

Volume Reflection Dependence of400 GeV/cProtons on the Bent Crystal Curvature

Theory of Planar Channeling of Relativistic Protons in Bent Crystals

Radiation of Channeled Particles in Deformed Crystals

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