Search for the prewave zone effect in transition radiation

Castellano, M.; Verzilov, V.; Catàni, L.; Cianchi, A.; D’Auria, G.; Ferianis, M.; Rossi, C.

doi:10.1103/physreve.67.015501

Cited by 17 publications

(24 citation statements)

References 5 publications

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“…It corresponds to distances for which the angular distribution of the electromagnetic field is affected by the transverse dimension of the source. Transition radiation in the prewave zone was then studied experimentally [5] showing good agreement with theoretical expectations. Far field conditions can only be considered valid for distances from the source much larger than γ 2 λ/2π, which implies that beam diagnostics based on TR radiation using long wavelength or for very high beam energies will be perturbed by prewave zone effects [6,7].…”

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confidence: 74%

Experimental Observation of “Shadowing” in Optical Transition Radiation

et al. 2018

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We report the observation of shadowing between two optical transition radiation (OTR) sources from a 205 MeV electron beam. The total optical intensity is measured as a function of the distance d between the sources, covering the range 0 < d < 4L v , where L v is the formation length of the particles. Data show that the total optical intensity starts decreasing due to shadowing when d approaches L v until it becomes undetectable for very short distances d/L v → 0. A model based solely on interference between the two OTR sources is in good agreement with experimental data. To the knowledge of the authors this is the first systematic experimental observation of shadowing in OTR.

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confidence: 74%

Experimental Observation of “Shadowing” in Optical Transition Radiation

et al. 2018

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“…In both cases the radiation was considered under several conditions, such as infinite perfectly conducting target and wave zone approximation, which impose some restriction on the field of application. Later further studies were conducted in order to generalize the obtained results beyond the ideal conditions, therefore finite screen size and observation in pre-wave zone [4,[9][10][11]. Here and further we use terms wave and pre-wave zones as they were used by Verzilov in [9].…”

Section: Theory and Simulationsmentioning

confidence: 98%

“…The TR and DR can be considered as an interaction between electron field and the target material. At high energy, due to the relativistic effects, the electron field becomes a flat disc in a plane perpendicular to the electron velocity vector, whose ''effective'' size can be estimated as $ kc [4,11,12]. For the wave zone approximation [3,6] the size of the target was considered as infinite with respect to the electron field, and in order to satisfy this condition the size of the target should be larger than the effective size of the electron field.…”

Section: Theory and Simulationsmentioning

confidence: 99%

Pre-wave zone studies of Coherent Transition and Diffraction Radiation

Shpakov

Bellaveglia

Castellano

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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Advanced accelerator technology, based on plasma structures, requires high brightness electron beams, which can be used also to drive advanced radiation sources. Indeed, electron beams to be injected into the plasma and accelerated in the plasma channel are characterized by small transverse size and ultra-short time duration, allowing the production of coherent radiation in the THz range. In the present work we report both theoretical and experimental studies on the spatial/angular distribution of Coherent Transition and Diffraction Radiation in the pre-wave zone

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“…For the case of TR such situation was first theoretically considered in [18,19]. The experimental investigations of TR characteristics in the prewave zone are reported in [20][21][22]. In these papers it was shown that radiation spectral-angular distribution registered by a pointlike detector in this situation significantly differs from the one registered in the wave zone (outside the formation region).…”

Section: Introductionmentioning

confidence: 99%

Formation region effects in transition radiation, bremsstrahlung, and ionization loss of ultrarelativistic electrons

Trofymenko

Шульга

2016

Phys. Rev. Accel. Beams

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The processes of transition radiation and bremsstrahlung by an ultrarelativistic electron as well as the effect of transition radiation influence upon the electron ionization loss in thin layer of substance are theoretically investigated in the case when radiation formation region has macroscopically large size. Special attention is drawn to transition radiation (TR) generated during the traversal of thin metallic plate by the electron previously deflected from its initial direction of motion. In this case TR characteristics are calculated for realistic (circular) shape of the electron deflection trajectory. The difference of such characteristics under certain conditions from the ones obtained previously with the use of approximation of anglelike shape of the electron trajectory (instant deflection) is shown. The problem of measurement of bremsstrahlung characteristics in the prewave zone is investigated. The expressions defining the measured radiation distribution for arbitrary values of the size and the position of the detector used for radiation registration are derived. The problem of TR influence upon the electron ionization loss in thin plate and in a system of two plates is discussed. The proposal for experimental investigation of such effect is formulated.

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Search for the prewave zone effect in transition radiation

Cited by 17 publications

References 5 publications

Experimental Observation of “Shadowing” in Optical Transition Radiation

Experimental Observation of “Shadowing” in Optical Transition Radiation

Pre-wave zone studies of Coherent Transition and Diffraction Radiation

Formation region effects in transition radiation, bremsstrahlung, and ionization loss of ultrarelativistic electrons

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