Transition radiation as an X-ray source

Piestrup, M. A.; Finman, P. F.; Chu, A. N.; Barbee, Troy W.; Pantell, R. H.; Gearhart, R.; Buskirk, F.R.

doi:10.1109/jqe.1983.1071820

Cited by 23 publications

(1 citation statement)

References 14 publications

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“…Equation ͑1͒ provides the condition for a constructive coherent interference of electromagnetic waves generated at different interfaces, at a distant point. Transition radiation differential efficiency in a multilayer structure, defined as the number of photons N per electron per unit solid angle ⍀ per unit interval of the TR frequency, can be expressed as 5,[11][12][13][14] …”

Section: Transition Radiation Efficiency Of a Multilayer Structurementioning

confidence: 99%

Transition radiation in metal-metal multilayer nanostructures as a medical source of hard x-ray radiation

Pokrovsky

Kaplan

Shkolnikov

2006

Journal of Applied Physics

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We show that a periodic metal-metal multilayer nanostructure can serve as an efficient source of hard x-ray transition radiation. Our research effort is aimed at developing an x-ray source for medical applications, which is based on using low-energy relativistic electrons. The approach toward choosing radiator-spacer couples for the generation of hard x-ray resonant transition radiation by few-MeV electrons traversing solid multilayer structures for the energies of interest to medicine (30–50keV) changes dramatically compared with that for soft x-ray radiation. We show that one of the main factors in achieving the required resonant line is the absence of the contrast of the refractive indices between the spacer and the radiator at the far wings of the radiation line; for that purpose, the optimal spacer, as a rule, should have a higher atomic number than the radiator. Having experimental goals in mind, we have considered also the unwanted effects due to bremsstrahlung radiation, absorption and scattering of radiated photons, detector-related issues, and inhibited coherence of transition radiation due to random deviation of spacing between the layers. Choosing as a model example a Mo–Ag radiator-spacer pair of materials, we demonstrate that the x-ray transition radiation line can be well resolved with the use of spatial and frequency filtering.

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Section: Transition Radiation Efficiency Of a Multilayer Structurementioning

confidence: 99%

Transition radiation in metal-metal multilayer nanostructures as a medical source of hard x-ray radiation

Pokrovsky

Kaplan

Shkolnikov

2006

Journal of Applied Physics

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Effects of space charge and multiple scattering on the gain of an X‐ray free electron laser using stimulated transition radiation

Yoshimori

Kawamura

1995

Electron Comm Jpn Pt II

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For the X‐ray free electron laser using stimulated transition radiation in periodic stacks of metal foils or polymer films, the effects considered are those that are due to: (1) the space charge of the relativistic electron beam; (2) multiple scattering of the electron beam passing through the stacks; and (3) both the space charge and multiple scattering simultaneously. Taking these respective effects into account in a Boltzmann transport equation, dispersion relations are derived and gain coefficients of the laser are calculated and compared. As a result, it is found that the effect of multiple scattering is large and it depends also on the magnitude of the electron beam energy, e.g., for the case of 50 GeV, the gain coefficient is decreased by several dB. The effect of the space charge is relatively small. Also, the gain coefficient generally decreases with the beam energy.

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Recent measurements of coherent transition radiation

Moran

1987

Nuclear Instruments and Methods in Physics Research Section B:

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Transition radiation as an X-ray source

Cited by 23 publications

References 14 publications

Transition radiation in metal-metal multilayer nanostructures as a medical source of hard x-ray radiation

Transition radiation in metal-metal multilayer nanostructures as a medical source of hard x-ray radiation

Effects of space charge and multiple scattering on the gain of an X‐ray free electron laser using stimulated transition radiation

Recent measurements of coherent transition radiation

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