| Autor: |
Graves, W. S., Berggren, K. K., Ravi, K., Swanwick, K., Velasquez-Garcia, L. F., Wong, L. J., Yang, Yudong, Zapata, Luis E., Zhou, Yue, Bessuille, J., Brown, P., Ihloff, E., Carbajo, Sergio, Derksen, Johann, Fallahi, Arya, Kaertner, Franz, Scheiba, Fabian, Wu, Xiaojun, Mihalcea, D., Piot, Ph., Hobbs, R., Hong, K. H., Huang, W. R., Keathley, P. D., Moncton, D. E., Nanni, E. |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
35th International Free-electron laser conference, FEL2013, Manhattan, USA, 2013-08-26-2013-08-30 |
| Popis: |
X-ray free electron laser studies are presented that rely on a nanostructured electron beam interacting with a “laser undulator” configured in the head-on inverse Compton scattering geometry. The structure in the electron beam is created by a nanoengineered cathode that produces a transversely modulated electron beam. Electron optics demagnify the modulation period and then an emittance exchange line translates the modulation to the longitudinal direction resulting in coherent bunching at x-ray wavelength.The predicted output radiation at 1 keV from a 7 MeV electron beam reaches 10 nJ or 6X108 photons per shot and is fully coherent in all dimensions, a result of the dominant mode growth transversely and the longitudinal coherence imposed by the electron beam nanostructure. This output is several orders of magnitude higher than incoherent inverse Compton scattering and occupies a much smaller phase space volume, reaching peak brilliance of 1027 and average brilliance of 1017 photons/(mm2 mrad2 0.1% sec). The device is much smaller and less expensive than traditional XFELs, requiring electron beam energy ranging from 2 MeV to a few hundred MeV for output wavelengths from the EUV to hard x-rays. Both laser and THz radiation may provide the undulator fields. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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