GRAAL: a polarized γ-ray beam at ESRF

Bocquet, J. P.; Ajaka, J.; Anghinolfi, M.; Bellini, V.; Berrier, G.; Calvat, P.; Capogni, M.; Casano, L.; Castoldi, M.; Corvisiero, P.; D’Angelo, A.; Didélez, J. P.; Salvo, R. Di; Djalali, C.; Duval, M.; Frascaria, R.; Gervino, G.; Ghio, F.; Girard, Pascal; Girolami, B.; Guinault, E.; Hourani, E.; Kuznetsov, V.; Lapik, A.; Sandri, P. Levi; Nigro, S. Ló; Moricciani, D.; Morlet, M.; Muccifora, V.; Nedorezov, V.; Perrin, C.; Rebreyend, D.; Renard, F.; Ricco, G.; Rigney, M.; Ripani, M.; Rosier, L.; Rossi, P.; Russew, T.; Sanzone, M.; Schaerf, C.; Scire, A.; Sperduto, M. L.; Sudov, A.S.; Taiuti, M.; Turinge, A.; Wiele, J. Van de; Vinciguerra, D.; Zucchiatti, A.

doi:10.1016/s0375-9474(97)00337-0

Cited by 28 publications

(5 citation statements)

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“…The common ways of producing high-energy polarized γrays are linear Compton scattering [15][16][17][18][19] and bremsstrahlung [20][21][22][23]. The advantage of the former is that it employs unpolarized electron beams, and the emitted γ-photon polarization is determined by the driving laser polarization, while in the latter the spin of the scattering electron determines the γ-photon polarization [24].…”

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confidence: 99%

“…Namely, in the nonlinear regime the circular polarization of the emitted γphoton requires longitudinally spin-polarized (LSP) electrons. Nevertheless, the nonlinear regime of Compton scattering is beneficial for the generation of polarized γ-photons, because the polarization is enhanced at high γ-photon energies [15], and the latter is increased in the nonlinear regime. Regarding deficiencies connected with the bremsstrahlung mechanism, the incoherent bremsstrahlung cannot generate LP γ-photons, and the scattering angle and emission divergence are both relatively large [25].…”

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confidence: 99%

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Polarized Ultrashort Brilliant Multi-GeV γ Rays via Single-Shot Laser-Electron Interaction

Shaisultanov

Chen

et al. 2020

Phys. Rev. Lett.

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Generation of circularly-polarized (CP) and linearly-polarized (LP) γ-rays via the single-shot interaction of an ultraintense laser pulse with a spin-polarized counterpropagating ultrarelativistic electron beam has been investigated in nonlinear Compton scattering in the quantum radiation-dominated regime. For the process simulation a Monte Carlo method is developed which employs the electron-spin-resolved probabilities for polarized photon emissions. We show efficient ways for the transfer of the electron polarization to the high-energy photon polarization. In particular, multi-GeV CP (LP) γ-rays with polarization of up to about 90% (95%) can be generated by a longitudinally (transversely) spin-polarized electron beam, with a photon flux at a single shot meeting the requirements of recent proposals for the vacuum birefringence measurement in ultrastrong laser fields. Such high-energy, high-brilliance, high-polarization γ-rays are also beneficial for other applications in high-energy physics, nuclear physics, and laboratory astrophysics.

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confidence: 99%

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confidence: 99%

Polarized Ultrashort Brilliant Multi-GeV γ Rays via Single-Shot Laser-Electron Interaction

Shaisultanov

Chen

et al. 2020

Phys. Rev. Lett.

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“…The microstrip detector provided the positions of the scattered electrons, i.e. their energy in microstrip units with the given calibration and resolution of the system (see 4,5,9 ). Then, for ESRF 6.04 GeV electron beam (γ = 11820) one has ∆c/c = 0.7 10 −8 ∆X CE /X CE .…”

Section: Abstract: Compton Effect; Acceleratorsmentioning

confidence: 99%

A New Limit on the Light Speed Isotropy From the Graal Experiment at Esrf

Gurzadyan

Bellini

Beretta

et al. 2012

The Twelfth Marcel Grossmann Meeting

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When the electrons stored in the ring of the European Synchrotron Radiation Facility (ESRF, Grenoble) scatter on a laser beam (Compton scattering in flight) the lower energy of the scattered electron spectra, the Compton Edge (CE), is given by the two body photon-electron relativistic kinematics and depends on the velocity of light. A precision measurement of the position of this CE as a function of the daily variations of the direction of the electron beam in an absolute reference frame provides a oneway test of Relativistic Kinematics and the isotropy of the velocity of light. The results of GRAAL-ESRF measurements improve the previously existing one-way limits, thus showing the efficiency of this method and the interest of further studies in this direction.

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“…At GRAAL, the 4π LAGRANγE detector was used in conjunction with a tagged polarised photon beam produced by Compton-scattering laser photons off circularly polarised electrons in the storage ring at the European Synchrotron Radiation Facility (ESRF) [46]. This data were taken at photon energies from threshold up to 1.5 GeV, and measured both the Σ (beam polarisation) and P (recoil) observables [47].…”

Section: Polarisation Observables At Other Facilitiesmentioning

confidence: 99%

Polarisation observables for strangeness photoproduction on a frozen spin target with CLAS at Jefferson Lab

Fegan¹

2012

AIP Conference Proceedings

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GRAAL: a polarized γ-ray beam at ESRF

Cited by 28 publications

References 1 publication

Polarized Ultrashort Brilliant Multi-GeV γ Rays via Single-Shot Laser-Electron Interaction

Polarized Ultrashort Brilliant Multi-GeV γ Rays via Single-Shot Laser-Electron Interaction

A New Limit on the Light Speed Isotropy From the Graal Experiment at Esrf

Polarisation observables for strangeness photoproduction on a frozen spin target with CLAS at Jefferson Lab

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