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Tobias Nyholm Wistisen

Quantum radiation reaction in aligned crystals beyond the local constant field approximation

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Quantum radiation reaction in aligned crystals beyond the local constant field approximation. / Wistisen, T. N.; Piazza, A. Di; Nielsen, C. F.; Sørensen, A. H.; Uggerhøj, U. I.

I: Physical Review Research , Bind 1, Nr. 3, 033014 , 10.2019.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

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@article{f84ed5db828447b88fbc0bdb3861d1a8,
title = "Quantum radiation reaction in aligned crystals beyond the local constant field approximation",
abstract = " We report on experimental spectra of photons radiated by 50 GeV positrons crossing silicon single crystals of thicknesses 1.1 mm, 2.0 mm, 4.2 mm, and 6.2 mm at sufficiently small angles to the (110) planes that their motion effectively is governed by the continuum crystal potential. The experiment covers a new regime of interaction where each positron emits several hard photons, whose recoil are not negligible and which are formed on lengths where the variation of the crystal field cannot be ignored. As a result neither the single-photon semiclassical theory of Baier et al. nor the conventional cascade approach to multiple hard photon emissions (quantum radiation reaction) based on the local constant field approximation are able to reproduce the experimental results. After developing a theoretical scheme which incorporates the essential physical features of the experiments, i.e., multiple emissions, photon recoil and background field variation within the radiation formation length, we show that it provides results in convincing agreement with the data. ",
keywords = "physics.plasm-ph, hep-ex, hep-ph",
author = "Wistisen, {T. N.} and Piazza, {A. Di} and Nielsen, {C. F.} and S{\o}rensen, {A. H.} and Uggerh{\o}j, {U. I.}",
year = "2019",
month = oct,
doi = "10.1103/PhysRevResearch.1.033014",
language = "English",
volume = "1",
journal = " Physical Review Research ",
issn = "2643-1564",
publisher = "American Physical Society",
number = "3",

}

RIS

TY - JOUR

T1 - Quantum radiation reaction in aligned crystals beyond the local constant field approximation

AU - Wistisen, T. N.

AU - Piazza, A. Di

AU - Nielsen, C. F.

AU - Sørensen, A. H.

AU - Uggerhøj, U. I.

PY - 2019/10

Y1 - 2019/10

N2 - We report on experimental spectra of photons radiated by 50 GeV positrons crossing silicon single crystals of thicknesses 1.1 mm, 2.0 mm, 4.2 mm, and 6.2 mm at sufficiently small angles to the (110) planes that their motion effectively is governed by the continuum crystal potential. The experiment covers a new regime of interaction where each positron emits several hard photons, whose recoil are not negligible and which are formed on lengths where the variation of the crystal field cannot be ignored. As a result neither the single-photon semiclassical theory of Baier et al. nor the conventional cascade approach to multiple hard photon emissions (quantum radiation reaction) based on the local constant field approximation are able to reproduce the experimental results. After developing a theoretical scheme which incorporates the essential physical features of the experiments, i.e., multiple emissions, photon recoil and background field variation within the radiation formation length, we show that it provides results in convincing agreement with the data.

AB - We report on experimental spectra of photons radiated by 50 GeV positrons crossing silicon single crystals of thicknesses 1.1 mm, 2.0 mm, 4.2 mm, and 6.2 mm at sufficiently small angles to the (110) planes that their motion effectively is governed by the continuum crystal potential. The experiment covers a new regime of interaction where each positron emits several hard photons, whose recoil are not negligible and which are formed on lengths where the variation of the crystal field cannot be ignored. As a result neither the single-photon semiclassical theory of Baier et al. nor the conventional cascade approach to multiple hard photon emissions (quantum radiation reaction) based on the local constant field approximation are able to reproduce the experimental results. After developing a theoretical scheme which incorporates the essential physical features of the experiments, i.e., multiple emissions, photon recoil and background field variation within the radiation formation length, we show that it provides results in convincing agreement with the data.

KW - physics.plasm-ph

KW - hep-ex

KW - hep-ph

U2 - 10.1103/PhysRevResearch.1.033014

DO - 10.1103/PhysRevResearch.1.033014

M3 - Journal article

VL - 1

JO - Physical Review Research

JF - Physical Review Research

SN - 2643-1564

IS - 3

M1 - 033014

ER -