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Superradiant Cherenkov–wakefield radiation as THz source for FEL facilities

An electron beam passing through a tube of small inner diameter which is lined on the inside with a dielectric layer will radiate energy in the THz range due to the interaction with the boundary. The resonant enhancement of certain frequencies is conditioned by structure parameters such as tube radi...

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Autores principales: Floettmann, Klaus, Lemery, Francois, Dohlus, Martin, Marx, Michaela, Tsakanov, Vasili, Ivanyan, Mikayel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7842226/
https://www.ncbi.nlm.nih.gov/pubmed/33399548
http://dx.doi.org/10.1107/S1600577520014058
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author Floettmann, Klaus
Lemery, Francois
Dohlus, Martin
Marx, Michaela
Tsakanov, Vasili
Ivanyan, Mikayel
author_facet Floettmann, Klaus
Lemery, Francois
Dohlus, Martin
Marx, Michaela
Tsakanov, Vasili
Ivanyan, Mikayel
author_sort Floettmann, Klaus
collection PubMed
description An electron beam passing through a tube of small inner diameter which is lined on the inside with a dielectric layer will radiate energy in the THz range due to the interaction with the boundary. The resonant enhancement of certain frequencies is conditioned by structure parameters such as tube radius and the permittivity and thickness of the dielectric layer. In low-loss structures narrow-band radiation is generated which can be coupled out by suitable antennas. For higher frequencies, the coupling to the resistive outer metal layer becomes increasingly important. The losses in the outer layer prohibit reaching higher frequencies with narrow-band conditions. Instead, short broad-band pulses can be generated with still attractive power levels. In the first section of the paper, a general theory of the impedance of a two-layer structure is presented and the coupling to the outer resistive layer is discussed. Approximate relations for the radiated energy, power and pulse length for a set of structure parameters are derived and compared with numerical results in the following section. Finally, the first numerical result of the out-coupling of the radiation by means of a Vlasov antenna and estimates of the achieved beam quality are presented.
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spelling pubmed-78422262021-02-05 Superradiant Cherenkov–wakefield radiation as THz source for FEL facilities Floettmann, Klaus Lemery, Francois Dohlus, Martin Marx, Michaela Tsakanov, Vasili Ivanyan, Mikayel J Synchrotron Radiat Research Papers An electron beam passing through a tube of small inner diameter which is lined on the inside with a dielectric layer will radiate energy in the THz range due to the interaction with the boundary. The resonant enhancement of certain frequencies is conditioned by structure parameters such as tube radius and the permittivity and thickness of the dielectric layer. In low-loss structures narrow-band radiation is generated which can be coupled out by suitable antennas. For higher frequencies, the coupling to the resistive outer metal layer becomes increasingly important. The losses in the outer layer prohibit reaching higher frequencies with narrow-band conditions. Instead, short broad-band pulses can be generated with still attractive power levels. In the first section of the paper, a general theory of the impedance of a two-layer structure is presented and the coupling to the outer resistive layer is discussed. Approximate relations for the radiated energy, power and pulse length for a set of structure parameters are derived and compared with numerical results in the following section. Finally, the first numerical result of the out-coupling of the radiation by means of a Vlasov antenna and estimates of the achieved beam quality are presented. International Union of Crystallography 2021-01-01 /pmc/articles/PMC7842226/ /pubmed/33399548 http://dx.doi.org/10.1107/S1600577520014058 Text en © Klaus Floettmann et al. 2021 http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.http://creativecommons.org/licenses/by/4.0/
spellingShingle Research Papers
Floettmann, Klaus
Lemery, Francois
Dohlus, Martin
Marx, Michaela
Tsakanov, Vasili
Ivanyan, Mikayel
Superradiant Cherenkov–wakefield radiation as THz source for FEL facilities
title Superradiant Cherenkov–wakefield radiation as THz source for FEL facilities
title_full Superradiant Cherenkov–wakefield radiation as THz source for FEL facilities
title_fullStr Superradiant Cherenkov–wakefield radiation as THz source for FEL facilities
title_full_unstemmed Superradiant Cherenkov–wakefield radiation as THz source for FEL facilities
title_short Superradiant Cherenkov–wakefield radiation as THz source for FEL facilities
title_sort superradiant cherenkov–wakefield radiation as thz source for fel facilities
topic Research Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7842226/
https://www.ncbi.nlm.nih.gov/pubmed/33399548
http://dx.doi.org/10.1107/S1600577520014058
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