The Gamma Factory Project at CERN: a New Generation of Research Tools Made of Light

Płaczek, W.; Abramov, A.; Alden, Siobhan; Fernandez, Reyes Alemany; Antsiferov, P. S.; Apyan, Armen; Bartosik, Hannes; Bessonov, E. G.; Biancacci, Nicolò; Bieroń, Jacek; Bogacz, Alex; Bosco, A.; Bruce, Roderik; Budker, Dmitry; Cassou, K.; Castelli, F.; Chaikovska, Iryna; Curatolo, C.; Czodrowski, P.; Derevianko, Andrei; Dupraz, Kevin; Dutheil, Yann; Dzierżęga, Krzysztof; Fedosseev, Valentin; Martinez, Nuria Fuster; Gibson, S. M.; Goddard, Brennan; Gorzawski, Arkadiusz; Hirlander, Simon; Jowett, J.; Kersevan, R.; Kowalska, Magdalena; Krasny, M. W.; Kroeger, Felix; Küchler, D.; Lamont, Mike; Lefèvre, T.; Manglunki, D.; Marsh, B. A.; Molson, James; Nutarelli, D.; Nevay, Laurence; Petrenko, Alexey; Petrillo, V.; Redaelli, Stefano; Peinaud, Y.; Pustelny, Szymon; Rochester, Simon; Sapinski, Mariusz; Schaumann, Michaela; Scrivens, R.; Serafini, L.; Shevelko, V.; Stoehlker, Thomas; Surzhykov, A.; Tolstikhina, I. Yu.; Velotti, Francesco; Weber, G.; Wu, Y.; Yin-Vallgren, C.; Zanetti, M.; Zimmermann, Felix; Zolotorev, M.; Zomer, F.

doi:10.5506/aphyspolbsupp.13.645

Cited by 7 publications

(4 citation statements)

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“…If we consider the muons around the energy distribution peak of 50 GeV corresponding to a 10% rms relative energy spread, the 20% of the produced muons are selected (with a longituadinal emittance value of ∼ 4.5 mm). The above mentioned coefficient corresponding to this selection is N µ ± / n xµ = 2×2.34 10 18 m −1 s −1 , comparable with the best option of the Gamma Factory [20,21] combined with LEMMA [3] analysed in Ref. [19].…”

Section: Simulation Results For Muon Beamssupporting

confidence: 65%

GeV muon beams with picometer-class emittance from electron-photon collisions

Curatolo,

Serafini

2021

Preprint

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Section: Simulation Results For Muon Beamssupporting

confidence: 65%

GeV muon beams with picometer-class emittance from electron-photon collisions

Curatolo,

Serafini

2021

Preprint

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“…If we consider the muons around the energy distribution peak of 50-100 GeV corresponding to a 10% RMS relative energy spread, the 20% of the produced muons are selected (with a longitudinal emittance value of ∼4.5 mm). The above-mentioned coefficient corresponding to this selection is N 10% µ ± / n x µ = 2 × 2.3 × 10 18 m −1 s −1 , is comparable with the best option of the Gamma Factory [18,19] combined with LEMMA [3], analysed in reference [17]. The corresponding value for WP500 is N 10% µ ± / n x µ = 2 × 16.3 × 10 18 m −1 s −1 .…”

Section: Simulation Results For Muon Beamssupporting

confidence: 59%

Electrons and X-rays to Muon Pairs (EXMP)

Curatolo

Serafini

2022

Applied Sciences

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One of the challenges of future muon colliders involves the production of muon beams carrying high phase space densities. In particular, the muon beam normalised transverse emittance is a relevant figure of merit used to meet luminosity requests. A typical issue impacting the achieved transverse emittance in muon collider schemes, thus far considered, is the phase space dilution caused by the Coulomb interaction of primary particles propagating into the target where muons were generated. In this study, we present a new scheme(named electrons and X-rays to muon pairs) for muon beam generation occurring in a vacuum via interactions of electron and photon beams. Setting the center of mass energy at about twice the threshold (i.e., around 350 MeV), the normalised emittance of the muon beam generated via muon pair production reaction (e−+γ→e−+μ++μ−) is largely independent on the emittance of the colliding electron beam and is set basically by the excess of transverse momentum in the muon pair creation. In absence of any other mechanism for emittance dilution, the resulting muon beam, with energy in the range of a few tens of GeV, is characterised by an ultra-low normalised transverse RMS emittance of a few nm rad, corresponding to a geometrical emittance below 10 π pm rad. This opens up the way to a new muon collider paradigm based on muon sources conceived with primary colliding beams delivered by 100 GeV-class energy recovery LINACs interacting with hard-X ray free electron lasers. The challenge is to achieve the requested luminosity of the muon collider adopting a strategy of low muon fluxes/currents combined to ultra-low emittances, to largely reduce the levels of muon beam-induced backgrounds.

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“…Indeed, the steering and control of the polarization of the Gamma Factory photons is of a paramount importance in various of its applications, such as creation of polarized muons and pions, searches for atomic parity nonconservation, or for nuclear physics spectroscopy. [ 2–5 ] Therefore, there is a strong request to investigate and analyze the polarization properties of elastically scattered photons within the framework of the Gamma Factory proposal. In the past, the irreducible polarization tensor approach has been successfully applied for the theoretical investigation of these (angular and polarization) properties.…”

Section: Introductionmentioning

confidence: 99%

Polarization of Photons Scattered by Ultra‐Relativistic Ion Beams

et al. 2022

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A theoretical investigation of the elastic resonant scattering of photons by ultra–relativistic and partially stripped ions is presented. Particular attention in the study is given to the angular distribution and polarization of scattered photons as “seen” in both the ion‐rest and laboratory reference frames. In order to evaluate these angular and polarization properties, the irreducible polarization tensor approach is combined with the density matrix theory. If, furthermore, the ion–photon coupling is treated within the electric dipole approximation, this framework enables one to obtain simple analytical expressions for both the emission pattern and the polarization Stokes parameters of the outgoing radiation. These (analytical) expressions for the , , and transitions are displayed and analyzed , that are of interest for the Gamma Factory project and whose realization is currently under discussion at CERN. Based on the performed analysis, it is demonstrated that the resonantly scattered photons can be strongly (linearly or circularly) polarized, and that this polarization can be well controlled by adjusting either the emission angle and/or the polarization state of the incident radiation. Moreover, the potential of the photon scattering for measuring the spin‐polarization of ion beams is also discussed in detail.

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The Gamma Factory Project at CERN: a New Generation of Research Tools Made of Light

Cited by 7 publications

References 0 publications

GeV muon beams with picometer-class emittance from electron-photon collisions

GeV muon beams with picometer-class emittance from electron-photon collisions

Electrons and X-rays to Muon Pairs (EXMP)

Polarization of Photons Scattered by Ultra‐Relativistic Ion Beams

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