Equilibrium energy spread and emittance in a Compton ring: An alternative approach

Chaikovska, Iryna; Variola, A.

doi:10.1103/physrevstab.17.044004

Cited by 11 publications

(5 citation statements)

References 33 publications

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“…The luminosity of the Compton collisions strongly depends on the size of the electron beam28 and so reflects the evolution of the electron beam emittance in the DR during which the electron beam eventually reaches an equilibrium determined by a balance between the radiation damping and the quantum excitation29. However, the collective effects such as intrabeam scattering, coherent synchrotron radiation, wakefields, etc.…”

Section: Discussionmentioning

confidence: 99%

High flux circularly polarized gamma beam factory: coupling a Fabry-Perot optical cavity with an electron storage ring

Chaikovska

Cassou

Chiche

et al. 2016

Sci Rep

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We report and discuss high-flux generation of circularly polarized γ-rays by means of Compton scattering. The γ-ray beam results from the collision of an external-cavity-enhanced infrared laser beam and a low emittance relativistic electron beam. By operating a non-planar bow-tie high-finesse optical Fabry-Perot cavity coupled to a storage ring, we have recorded a flux of up to (3.5 ± 0.3) × 108 photons per second with a mean measured energy of 24 MeV. The γ-ray flux has been sustained for several hours. In particular, we were able to measure a record value of up to 400 γ-rays per collision in a full bandwidth. Moreover, the impact of Compton scattering on the electron beam dynamics could be observed resulting in a reduction of the electron beam lifetime correlated to the laser power stored in the Fabry-Perot cavity. We demonstrate that the electron beam lifetime provides an independent and consistent determination of the γ-ray flux. Furthermore, a reduction of the γ-ray flux due to intrabeam scattering has clearly been identified. These results, obtained on an accelerator test facility, warrant potential scaling and revealed both expected and yet unobserved effects. They set the baseline for further scaling of the future Compton sources under development around the world.

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Section: Discussionmentioning

confidence: 99%

High flux circularly polarized gamma beam factory: coupling a Fabry-Perot optical cavity with an electron storage ring

Chaikovska

Cassou

Chiche

et al. 2016

Sci Rep

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“…TSST [33]), modelling the equivalent undulator radiation emitted by electrons wiggling in the electromagnetic field of the incoming laser pulse, allow to analyze particular situations such as the use of chirped [34], tilted [35] and twisted [36] lasers. In the recent past some efforts have been developed to carry out analytical treatments of the beam-beam collision physics, embedding the single electron-photon collision from a quantum point of view within a rms distribution of the scattered photon beam [27,[37][38][39][40][41][42][43], or, within a classical framework, integrating the radiated power in the far field on the distributions of the colliding beams [1,33,44]. This latter approach suffers from a non-conservation of energy and momentum, due to its lack of describing correctly the electron recoil in the scattering process.…”

Section: Introductionmentioning

confidence: 99%

Analytical description of photon beam phase spaces in inverse Compton scattering sources

Curatolo

Drebot

Petrillo

et al. 2017

Phys. Rev. Accel. Beams

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We revisit the description of inverse Compton scattering sources and the photon beams generated therein, emphasizing the behavior of their phase space density distributions and how they depend upon those of the two colliding beams of electrons and photons. Main objective is to provide practical formulas for bandwidth, spectral density, brilliance, which are valid in general for any value of the recoil factor, i.e. both in the Thomson regime of negligible electron recoil, and in the deep Compton recoil dominated region, which is of interest for gamma-gamma colliders and Compton Sources for the production of multi-GeV photon beams. We adopt a description based on the center of mass reference system of the electron-photon collision, in order to underline the role of the electron recoil and how it controls the relativistic Doppler/boost effect in various regimes. Using the center of mass reference frame greatly simplifies the treatment, allowing to derive simple formulas expressed in terms of rms momenta of the two colliding beams (emittance, energy spread, etc.) and the collimation angle in the laboratory system. Comparisons with Monte Carlo simulations of inverse Compton scattering in various scenarios are presented, showing very good agreement with the analytical formulas: in particular we find that the bandwidth dependence on the electron beam emittance, of paramount importance in Thomson regime, as it limits the amount of focusing imparted to the electron beam, becomes much less sensitive in deep Compton regime, allowing a stronger focusing of the electron beam to enhance luminosity without loss of mono-chromaticity. A similar effect occurs concerning the bandwidth dependence on the frequency spread of the incident photons: in deep recoil regime the bandwidth comes out to be much less dependent on the frequency spread. The set of formulas here derived are very helpful in designing inverse Compton sources in diverse regimes, giving a quite accurate first estimate in typical operational conditions for number of photons, bandwidth, spectral density and brilliance values -the typical figures of merit of such radiation sources.

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“…In Sec. III, we briefly summarize the formula proposed by Chaikovska [32] to evaluate the equilibrium energy spread and emittance of an electron beam for the storage ring aiming to generate an x-or gamma-ray source based on the CBS technique. Then we describe our simulation process, present the results for transverse and longitudinal dynamics, and compare the simulation results to the theoretical prediction.…”

Section: B a Storage Ring Designmentioning

confidence: 99%

“…In order to operate the storage ring with stable gamma-ray flux generation, we should study the beam dynamics at the equilibrium states under the influence of Compton scattering. We conduct our study primarily by a simulation which uses the parallel macroparticle tracking technique based on the accelerator modeling library TRACY [42] and compare the results to analytical estimation by the formula from Chaikovska [32]. The laser energy and wavelength are varied to investigate how the Compton scattering affects the beam dynamics in a storage ring and study the stability condition associated with particle loss.…”

Section: Dynamics In Compton Gamma-ray Storage Ringmentioning

confidence: 99%

Design and dynamic studies for a compact storage ring to generate gamma-ray light source based on Compton backscattering technique

Pan¹,

Byrd²,

Hao³

et al. 2019

Phys. Rev. Accel. Beams

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As the development of nuclear physics and atomic sciences progresses, monochromatic and high-flux gamma-ray light sources are highly demanded by many experiments in these fields. We have designed a compact storage ring for gamma-ray source generation based on the Compton backscattering technique. The energy range of the electron beam stored in the ring will be from 500 to 800 MeV, with the capability of generating a gamma ray with an energy range from about 4 to 10 MeV. The maximum energy loss for an electron could be more than 1% for one scattering event, which could have a significant impact on electron beam dynamics. To study this impact, a 6D macroparticle tracking code has been developed by including the Compton scattering, damping, quantum excitation, and synchrotron radiation in the storage ring. The equilibrium states have been studied with this code, and the results show good agreement with theoretical predictions. The electron beam loss rate induced by Compton scattering has also been investigated by varying the input laser beam parameters. This study allows us to optimize the storage ring operation for a stable, high-flux, and narrow-bandwidth gamma-ray beam generation.

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Equilibrium energy spread and emittance in a Compton ring: An alternative approach

Cited by 11 publications

References 33 publications

High flux circularly polarized gamma beam factory: coupling a Fabry-Perot optical cavity with an electron storage ring

High flux circularly polarized gamma beam factory: coupling a Fabry-Perot optical cavity with an electron storage ring

Analytical description of photon beam phase spaces in inverse Compton scattering sources

Design and dynamic studies for a compact storage ring to generate gamma-ray light source based on Compton backscattering technique

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