Synchrotron oscillations in high-energy synchrotrons
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Oscillation (cell signaling)
High-energy X-rays
Synchrotron light source
Christian ministry
Beam emittance
High-energy X-rays
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In recent years, X-ray synchrotron radiation became a powerful tool for studies of condensed matter, and in view of that a proposal for the construction of a European Synchrotron Radiation Facility (ESRF) was elaborated in some detail by the European Synchrotron Radiation Project. The heart of the proposed Facility is a 5 GeV electron storage ring with a 100-200 mA electron current and a characteristic wavelength of 0.9 A from bending magnets. The storage ring is able to accommodate up to 30 wavelength shifters, multipole wigglers and undulators. It is characterized by a small emittance (7 X 10/sup 9/ rad m) leading to a very high brilliance (10/sup 19/ photons/s/mm/sup 2/ of the source1/mrad/sup 2/ solid angle in a relative bandwidth of 0.1% in case of a 1 A undulator). The review gives a brief account of the storage ring, the emitted radiation and applications of X-ray synchrotron radiation in fundamental and applied research. It is preceded by a short summary of information about synchrotron radiation. (Auth.).
Undulator
High-energy X-rays
Wiggler
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There are 40 bending magnets in the 432-m storage ring of the Shanghai Synchrotron Radiation Facility(SSRF).A total power of 435 kW is delivered by synchrotron radiations when the electron beams pass through the bending magnets.Only a small part of the radiation is extracted into the beamlines and the experiment stations, and the rest has to be absorbed and transferred out of the storage ring.Photon absorbers are placed at different points of the storage ring to intercept the unused synchrotron radiation and align the extracted light.In this paper, the radiation treatment method is discussed and layout of the absorbers is described in detail.The structure of the absorbers, the manufacture and assembly, and performance of the absorbers are introduced.
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Precise measurement and control of the particle beam emittance is a very important input to characterize the performance of any accelerator/SRS. Beam characterizations at the SOLARIS National Synchrotron Radiation Centre are provided by two independent diagnostic beamlines called the X-ray synchrotron radiation (PINHOLE) and optical synchrotron radiation (LUMOS) beamlines, respectively. The PINHOLE beamline depicts the electron beam by analyzing the emitted X-rays. However this method is predominantly applied to the middle and high energy storage rings. At Solaris storage ring with the nominal energy of 1.5 GeV and critical photon beam energy of c.a. 2 keV, the design of the beamline was modified to provide sufficient X-ray photon flux for proper imaging. Second diagnostic beamline LUMOS will be installed and commissioned in next few months. Issues discussed include the general design philosophy, choice of instrumentation, limits to resolution, and actual performance.
Pinhole (optics)
High-energy X-rays
Advanced Photon Source
Synchrotron light source
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Oscillation (cell signaling)
High-energy X-rays
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We investigate influence on the storage ring beam dynamics of the coherent Synchrotron Radiation (SR) self fields produced by an electron bunch. We show that the maximum energy gain in the RF cavity must far exceed the energy loss of electrons due to the coherent SR.
Dynamics
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High-energy X-rays
SPring-8
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We study the modifications of synchrotron radiation of charges in a storage ring as they are cooled. The pair correlation lengths between the charges are manifest in the synchrotron radiation and coherence effects exist for wavelengths longer than the coherence lengths between the charges. Therefore, the synchrotron radiation can be used as a diagnostic tool to determine the state (gas, liquid, crystal) of the charged plasma in the storage ring. We show also that the total power of the synchrotron radiation is significantly reduced for crystallized beams, both coasting and bunched. This opens the possibility of accelerating particles to ultrarelativistic energies using small-sized cyclic accelerators.
High-energy X-rays
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High-energy X-rays
Synchrotron light source
Radius of curvature
Bunches
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The advent of large high-energy storage rings has facilitated the need for more detailed analysis of synchrotron radiation interactions and related thermal effects. In the PEP storage ring, a maximum of 5 MW of synchrotron radiation with a critical energy of 44 keV will interact with 2200 m of vacuum hardware. A Monte Carlo based computer code, EGS, was employed to follow electromagnetic reactions of the synchrotron radiation through various computerized models of the vacuum system. The computer simulated structures with hundreds of discrete regions and varying materials. Results showed that typically 70% of the synchrotron power was absorbed in incident surfaces and 20% was scattered outside the vacuum vessel. The remaining power was deposited in varied vacuum components. Sensitive PEP ring components, particularly distributed ion pumps, were subsequently designed to minimize power absorption and to maximize cooling effects. Other thermal calculations were employed to design for minimal wall temperatures in areas of direct synchrotron radiation incidence.
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