Coherent bremsstrahlung atpporp¯pcolliders

Ginzburg, I.F.; Kotkin, Gleb L.; Polityko, S. I.; Serbo, V.G.

doi:10.1103/physrevlett.68.788

Cited by 40 publications

(65 citation statements)

References 4 publications

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“…A detailed theoretical treatment of this effect for CBS was given in Refs. [7][8][9][10][11]. Therefore, in our case we also expect an unusual behavior of the photon rate as a function of the beam axis displacements.…”

Section: Beam Axis Displacementmentioning

confidence: 83%

“…This result is fully consistent with that obtained in the CBS approximation of Refs. [7][8][9][10][11], because in the limit ! 0, mainly small deflection angles contribute to the coherent process, and thus the CBS approximation remains valid, including prefactors.…”

Section: Spectrum Of Low-energy Photonsmentioning

confidence: 99%

“…CBS was considered in detail in Refs. [7][8][9][10][11][12]. However, for all the discussed colliders, the parameter * 1 (see Table II).…”

Section: Introductionmentioning

confidence: 99%

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Emission of low-energy photons by electrons at electron-positron and electron-ion colliders with dense bunches

Kotkin

Serbo

2009

Phys. Rev. ST Accel. Beams

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Usually, the emission of low-energy photons in electron-positron (or electron-ion) bunch collisions is calculated with the same approach as for synchrotron radiation (beamstrahlung). However, for soft photons (E < E c where E c is a critical photon energy), when the coherence length of the radiation becomes comparable to the bunch length, the beamstrahlung approximation becomes invalid. In this paper, we present results of our calculation for this region based on approximation of classical currents. We consider several colliders with dense bunches. The number of low-energy photons dN emitted by N e electrons per bunch crossing in the energy interval dE is dN ¼ gN e dE =E , where is the finestructure constant, and the function g, which depends on the bunch parameters, typically is of order unity for modern colliders. In particular, for the International Linear Collider, we find that E c ¼ 83 keV and g ¼ 5:5 at a vanishing beam axis displacement, and g ¼ 0:88, E c ¼ 0:24 keV for KEKB. We also calculate the specific dependence of dN on the impact parameter between the two beam axes. In principle, the latter aspect allows for online monitoring of the beam axis displacement.

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Section: Beam Axis Displacementmentioning

confidence: 83%

Section: Spectrum Of Low-energy Photonsmentioning

confidence: 99%

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Emission of low-energy photons by electrons at electron-positron and electron-ion colliders with dense bunches

Kotkin

Serbo

2009

Phys. Rev. ST Accel. Beams

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“…(6,13,15), the number of the emitted CBS photons is proportional to the number of electrons N e and to the squared number of positrons N 2 p , i.e. dN CBS γ ∝ N e N 2 p .…”

Section: Discussionmentioning

confidence: 99%

“…[4]. A quantum treatment of CBS based on the rigorous concept of colliding wave packets were considered in [5], some applications of CBS to modern colliders in [6,3,7,8,9]. A new method to calculate CBS based on the equivalent photon approximation for the collective electromagnetic field of the oncoming bunch is presented in [8].…”

Section: Three Types Of Radiation At Collidersmentioning

confidence: 99%

Coherent Bremsstrahlung at Beijing Electron-Positron Collider

Ding

Serbo

1999

Chinese Phys. Lett.

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Coherent bremsstrahlung (CBS) is a specified type of radiation at colliders with short bunches. In the present paper we calculate the main characteristics of CBS for the BEPC collider. At this collider dN γ ∼ 3 · 10 8 dE γ /E γ photons of CBS will be emitted for a single collision of the beams in the energy range E γ < ∼ 240 eV. It seems that CBS can be a potential tool for optimizing collisions and for measuring beam parameters. Indeed, the bunch length σ z can be found from the CBS spectrum because critical energy E c ∝ 1/σ z ; the horizontal transverse bunch size σ x is related to dN γ ∝ 1/σ 2 x . Besides, CBS may be very useful for a fast control over an impact parameter R between the colliding bunch axes because a dependence of dN γ on R has a very specific behavior.It seems quite interesting to investigate this type of radiation at the BEPC collider (for example, in the range of a visible light with the rate about 3 · 10 14 photons per second) and to apply it for the fast beam control.

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