By Helmut Wiedemann
This ebook covers newest improvement in thought and experiments of unconventional radiation construction. in particular, the iteration of Tera-Hertz and X-ray radiation from low strength electron beams within the kind of Channeling, Transition, Diffraction, Cherenkov, Smith-Purcell, PXR and Crystalline Undulator Radiation are provided. fabric features like skinny goals, curved or bend crystals, inhomogeneous and left passed fabrics, multilayers in addition to stimulation via exterior radiation are coated to illustrate their impression in those methods. Novel principles are provided at the use of such radiation in detectors and particle beam computer screen improvement with more desirable strength or time solution. The booklet assumes a few familiarity of the reader with theoretical strategies underlying those phenomena and is for that reason of basic use to the training scientist. extra basic discussions of those phenomena are available within the 2002 monograph "Electron-Photon interplay in Dense Media" in the NATO technology sequence II: arithmetic, Physics and Chemistry – Vol. forty nine.
Read or Download Advanced Radiation Sources and Applications: Proceedings of the NATO Advanced Research Workshop, held in Nor-Hamberd, Yerevan, Armenia, August 29-September 2, 2004 PDF
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Additional info for Advanced Radiation Sources and Applications: Proceedings of the NATO Advanced Research Workshop, held in Nor-Hamberd, Yerevan, Armenia, August 29-September 2, 2004
Thus, the PXR generated on the G crystallographic planes g1 in the whole bent crystal, several centimeters in length will be collected (focused) on the axis f . The Huygens construction for formation of the PXR from a perfect crystal may be found in Refs. [12,14]. Here, Fig. 2 shows the Huygens construction for formation and focusing of the PXR wavetrain from a bent crystal. The spherical wavefronts are going from the points, where the particle crosses the crystallographic planes denoted by the reciprocal lattice G vector g1 .
Besides, the backward-going PXR is generated on the G crystallographic planes denoted by the reciprocal lattice vector g3 . It is shown by a horizontal wavy line with the arrow. Then it is diffracted on the crystallographic planes denoted by the G reciprocal lattice vector g 2 and is focused at the axis f . of length l Apart from the PXR emission, the particles moving through the crystalline plate ionize the crystal atoms, and thus make them emit the PXR,CR,CU Radiation from Bent Crystals 33 characteristic X-ray radiation (CXR).
3. The exact tuning of CUR frequency may be provided by a correct choice of the incident particle energy. The angular positions of the PXR reflection, and of diffracted and extracted crystal undulator radiation (DCUR) are shown in Fig. 6. Note that the frequency band of extracted CUR may be proportional to the amplitude of the periodical crystal bend, as the Bragg condition should vary periodically, according to the crystal lattice curvature. Figure 6. Extraction of undulator radiation from the crystal undulator.