Superradiant Cherenkov-Wakefield Radiation as THz Source for FEL Facilities
| Autor: | Michaela Marx, Vasili Tsakanov, Mikayel Ivanyan, Klaus Floettmann, Martin Dohlus, Francois Lemery |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Permittivity
Nuclear and High Energy Physics Terahertz radiation THz source Physics::Optics 01 natural sciences Optics 0103 physical sciences ddc:550 dielectric tube 010306 general physics Instrumentation Cherenkov radiation Coupling Physics Resistive touchscreen Range (particle radiation) Radiation 010308 nuclear & particles physics business.industry Vlasov antenna Research Papers Physics::Accelerator Physics Laser beam quality Antenna (radio) business |
| Zdroj: | Journal of synchrotron radiation 28(1), 18-27 (2021). doi:10.1107/S1600577520014058 Journal of Synchrotron Radiation |
| ISSN: | 1600-5775 |
| DOI: | 10.3204/pubdb-2020-04659 |
| Popis: | Journal of synchrotron radiation 28(1), 18 - 27 (2021). doi:10.1107/S1600577520014058 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. Published by Wiley-Blackwell, [S.l.] |
| Databáze: | OpenAIRE |
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