Advanced Radiation Sources and Applications by Helmut Wiedemann

By Helmut Wiedemann

This publication covers most up-to-date improvement in thought and experiments of unconventional radiation construction. particularly, 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 awarded. fabric features like skinny goals, curved or bend crystals, inhomogeneous and left passed fabrics, multilayers in addition to stimulation by way of exterior radiation are coated to illustrate their effect in those approaches. Novel rules are provided at the use of such radiation in detectors and particle beam visual display unit improvement with superior power or time answer. The booklet assumes a few familiarity of the reader with theoretical options underlying those phenomena and is as a result of fundamental use to the practising scientist. extra primary discussions of those phenomena are available within the 2002 monograph "Electron-Photon interplay in Dense Media" in the NATO technological know-how sequence II: arithmetic, Physics and Chemistry – Vol. forty nine.

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Meth. B 122 (1997) 13. 4. Ivashin, Nucl. Instr. Meth. A 249 (1986) 308. 5. Polikarpov, J. of Phys D: Appl. Phys. 21 (1988) 831. 6. Feranchuk, Nucl. Instr. Meth. 228 (1985) 490. 7. Feranchuk, Phys. Lett. A 76 (1980) 452. 8. Feranchuk, Phys. Lett. A 102 (1984) 141. 9. Ivashin, Krystallographiya 34 (1989) 39. 10. Baryshevsky, Channeling, Radiation and Reactions in Crystals under the High Energies, Belarusian University, Minsk, 1982. 11. Feranchuk, Coherent Phenomena for the Processes of X-ray and J - Radiation from the Relativistic Charged Particles, Doctor of Science Thesis, Belarusian University, Minsk, 1985.

The focused PXR train will possess the periodical frequency and phase modulation with the period T l / V , where l the crystal undulator period and V is the particle velocity. Figure 7. Diffraction, extraction and focusing of crystal undulator radiation. Positrons or other positive particles are channeling along a cylindrically bent crystal undulator in the G crystallographic planes denoted by the reciprocal lattice vector g . They emit the CUR of frequency ZCUR Z B along of particles trajectory ( Z B is the Bragg frequency relative to the crystallographic planes at 45 D to the particle trajectory, that are denoted by the reciprocal G lattice vector g1 ).

Therefore it would be of interest to extract the CUR through the side of the undulator. This may be done provided that the CUR frequency is equal to the Bragg frequency for one of the crystallographic planes. V. Shchagin the channeling radiation case in Fig. 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.

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