Next-generation ultra-compact calorimeters based on oriented crystals

Soldani, M.; Bandiera, L.; Bomben, L.; Brizzolari, C.; Camattari, Riccardo; Cavoto, G.; Salvador, Davide De; Guidi, V.; Lutsenko, Evgeny; Mascagna, V.; Mazzolari, A.; Moulson, M.; Prest, M.; Romagnoni, M.; Ronchetti, F.; Sytov, Alexei; Vallazza, E.

doi:10.22323/1.390.0872

“…The crystalline target was mounted on a high-precision goniometer equipped with two linear stages (vertical and horizontal) to move the crystal under test into the beam path and two rotational stages to orient its lattice planes or axes with respect to the average beam direction [63]. The crystal was mounted on a light plastic support that was built to guarantee a pre-alignment of the order of 1 mrad at the installation on the rotational stages.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Crystal-based pair production for a lepton collider positron source

Bandiera

¹

,

Bomben

²

,

Camattari

³

et al. 2022

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An intense positron sources is a demanding element in the design of future lepton colliders. A crystal-based hybrid positron source could be an alternative to a more conventional scheme based on the electron conversion into positron in a thick amorphous target. The conceptual idea of the hybrid source is to have two separate objects, a photon radiator and a photon-to-positron converter target. In such a scheme an electron beam crosses a thin axially oriented crystal with the emission of a channeling radiation, characterized by a considerably larger amount of photons if compared to Bremsstrahlung. The net result is an increase in the number of produced positrons at the converter target. In this paper we present the results of a beam test conducted at the DESY TB 21 with 5.6 GeV electron beam and a crystalline tungsten radiator. Experimental data clearly highlight an increased production of photons and they are critically compared with the outcomes of novel method to simulate the number of radiated photons, showing a very good agreement. Strong of this, the developed simulation tool has been exploited to design a simple scheme for a positron source based on oriented crystal, demonstrating the advantages in terms of reduction of both deposited energy and the peak energy deposition density if compared to conventional sources. The presented work opens the way for a realistic and detailed design of a hybrid crystal-based positron source for future lepton colliders.

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“…The electromagnetic interactions between crystalline matter and charged particles can occur with a small angle between the lattice axes (the periodic strings of nuclei) of the former and the trajectories of the latter. If this is the case, in general, the features of such interactions are substantially different from those occurring in amorphous matter and depend on the angle between the input trajectories and the target axes [1,2].…”

Section: Coherent Interactions Of Particles With Oriented Crystals An...mentioning

confidence: 99%

Enhanced electromagnetic radiation in oriented scintillating crystals at the 100-MeV and sub-GeV scales

Soldani¹,

Bandiera²,

Bomben³

et al. 2022

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2021)

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Nowadays, it is well known that the electromagnetic interaction between high-energy particles and matter experiences substantial modifications when the latter consists of a crystalline medium and its lattice axes are almost parallel to the input beam direction. In particular, a strong boost to the cross section of bremsstrahlung by electrons and positrons in high-density oriented crystals has been observed in the 10-to-100 GeV regime. This effect proves particularly appealing when it comes to inorganic scintillators, given the possibility to exploit it for the development of high-performance, ultra-compact electromagnetic calorimeters. This work provides a detailed discussion of the results obtained by probing a PWO (lead tungstate) oriented sample with 120 GeV/ electrons and positrons at the CERN North Area: in particular, a comparison between the outcomes obtained with electrons and positrons is made. Moreover, output radiation measurements on a thinner oriented PWO sample have been recently performed in the sub-GeV regime at the MAMI-B facility: an overview on the resulting characterisation is given.

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“…The crystalline target was mounted on a high-precision goniometer equipped with two linear stages (vertical and horizontal) to move the crystal under test into the beam path and two rotational stages to orient its lattice planes or axes with respect to the average beam direction [62]. The crystal was mounted on a light plastic support that was built to guarantee a pre-alignment of the order of 1 mrad at the installation on the rotational stages.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Crystal-based pair production for a lepton collider positron source

Bandiera,

Bomben,

Camattari

et al. 2022

Preprint

0

View full text Add to dashboard Cite

An intense positron sources is a demanding element in the design of future lepton colliders. A crystal-based hybrid positron source could be an alternative to a more conventional scheme based on the electron conversion into positron in a thick amorphous target. The conceptual idea of the hybrid source is to have two separate objects, a photon radiator and a photon-to-positron converter target. In such a scheme an electron beam crosses a thin axially oriented crystal with the emission of a channeling radiation, characterized by a considerably larger amount of photons if compared to Bremsstrahlung. The net result is an increase in the number of produced positrons at the converter target. In this paper we present the results of a beam test conducted at the DESY TB 21 with 5.6 GeV electron beam and a crystalline tungsten radiator. Experimental data clearly highlight an increased production of photons and they are critically compared with the outcomes of novel method to simulate the number of radiated photons, showing a very good agreement. Strong of this, the developed simulation tool has been exploited to design a simple scheme for a positron source based on oriented crystal, demonstrating the advantages in terms of reduction of both deposited energy and the peak energy deposition density if compared to conventional sources. The presented work opens the way for a realistic and detailed design of a hybrid crystal-based positron source for future lepton colliders.

show abstract

Next-generation ultra-compact calorimeters based on oriented crystals

Cited by 6 publications

References 8 publications

Crystal-based pair production for a lepton collider positron source

Crystal-based pair production for a lepton collider positron source

Enhanced electromagnetic radiation in oriented scintillating crystals at the 100-MeV and sub-GeV scales

Crystal-based pair production for a lepton collider positron source

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