Download Advanced Radiation Sources and Applications: Proceedings of by R. Avakian, K. Ispirian (auth.), Helmut Wiedemann (eds.) PDF

By R. Avakian, K. Ispirian (auth.), Helmut Wiedemann (eds.)

A NATO complicated study Workshop on ”Advanced Radiation assets and purposes” was once held from August 29 to September 2, 2004. Hosted via the Yerevan Physics Institute, Yerevan, Armenia, 30 invited researchers from former Soviet Union and NATO nations accrued at Nor-Hamberd, Yerevan, at the slopes of Mount Aragats to debate fresh theoretical in addition to expe- psychological advancements on technique of generating photons from more often than not low power electrons. Thismeetingbecamepossiblethroughthegenerousfundingprovidedbythe NATO technology Committee and the programme director Dr. Fausto Pedrazzini within the NATO Scienti?c and Environmental Affairs department. The workshop - rectors have been Robert Avakian, Yerevan Physics Institute, Armenia and Helmut Wiedemann, Stanford (USA). Robert Avakian supplied employees, logistics and - frastructure from the Yerevan Physics institute to guarantee a gentle execution of the workshop. distinctive thank you is going to Mrs. Ivetta Keropyan for admin- trative and logistics help to overseas viewers. The workshop was once held on the institute’s lodge in Nor-Hamberd at the slopes of Mount Aragats now not faraway from the Yerevan cosmic ray station. The isolation and peaceable surroundings of the lodge supplied the historical past for a fruitful week of displays and discussions. Following our invites, 38 researchers during this ?eld got here to the workshop from Armenia, Belarus, Romania, Russia, Ukraine, Denmark, France, G- many and the us. Commuting from Yerevan neighborhood scientists joined the day-by-day displays. Over a ?ve day interval forty shows have been given.

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Extra resources for Advanced Radiation Sources and Applications: Proceedings of the NATO Advanced Research Workshop, held in Nor-Hamberd, Yerevan, Armenia, August 29 - September 2, 2004

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Lett. A 148, 485-488 (1990). 21. -H. , B. , H. , S. , H. , F. , C. H. , O. Kettig, G. Kube, W. Lauth, H. Schope, Th. , Phys. Rev. Lett. 79, 2462-2465 (1997). 22. V. A. Khizhnyak, Differential properties of parametric X-ray radiation from a thin crystal, Nucl. Instr. and Meth. B 119, 115-122 (1996). 23. T. Ikeda, Y. Matsuda, H. H. Ohtsuki, Parametric X-ray radiation by relativistic channeled particles, Nucl. Instr. and Meth. B 115, 380-383 (1996). 24. V. I. A. Khizhnyak, K-shell ionization cross section of Si atoms by relativistic electrons, Nucl.

2 Focusing of channeling radiation In some cases, the extracted channeling radiation, shown in Fig. 3, may be focused if the crystal is smoothly bent. As an example, Fig. 4 shows the focusing of ChR extracted at a right angle from a cylindrically bent crystal. Positrons are channeling along the crystallographic planes denoted G by the reciprocal lattice vector g . A part of channeling radiation with the frequency ZChR equal to the Bragg frequency ZB and with the polarization in the plane of Fig.

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). The CXR is isotropic and not focused, but it exists at points F1 and F2 , too. Further, the backward-going PXR should be focused at the same points F1 and F2 .

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