Keyword: insertion
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WEPB01 Photon Beam Imager at SOLEIL undulator, radiation, vacuum, operation 425
  • M. Labat, J. Da Silva, N. Hubert, F. Lepage
    SOLEIL, Gif-sur-Yvette, France
  In one of the long straight sections of SOLEIL is installed a pair of canted in-vacuum undulators for the ANATOMIX and NANOSCOPIUM beamlines. Since the upstream undulator radiation can potentially damage the downstream undulator magnets, an accurate survey of the respective alignment of the two devices is mandatory. An XBPM has been initially installed for this purpose in the beamline frontend. For redundancy and further analysis, an X-ray imager was then designed and added just downstream the XBPM. It is made of a diamond plate that can be inserted into the upstream beamline frontend at low current. Fluorescence of the Nitrogen impurities in the diamond is imaged on a CCD to check that the upstream radiation is not hitting the downstream insertion device. We present the commissioning of this new device together with its first results in operation.  
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THOB02 Energy Loss Measurements with Streak Camera at ALBA injection, storage-ring, simulation, synchrotron 548
  • A.A. Nosych, B. Bravo, U. Iriso
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  Analyzing streak camera images of the beam injected into a Storage Ring with no RF voltage allows calculating several parameters, like the energy loss per turn and the energy mismatch between injected and stored beams. These measurements are based on the analysis of the centroid drift path of a bunch as it spirals inwards, changing its rotation period. This drift is clear and measurable in single and multi-bunch modes in several horizontal sweep speeds of the streak. With this technique we also measure the momentum compaction factor and observe its change with respect to the insertion devices' open/closed states. The obtained values are comparable with theoretical expectations, as well as with values measured by other means.  
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THOB03 Long Term Investigation of the Degradation of Coaxial Cables radiation, operation, scattering, pick-up 552
  • M. Kuntzsch, R. Schurig
    HZDR, Dresden, Germany
  • S.J. Burger
    Delta Gamma RF-Expert, Melbourne, Australia
  • T. Weber
    el-spec GmbH, Geretsried, Germany
  For the transport of RF signals coaxial cables with PTFE ('Teflon') as dielectric medium are widely used because they offer a wide bandwidth and low insertion loss. Coaxial cables that are routed in immediate vicinity to the beamline are exposed to ionizing radiation that is mainly generated by beam-loss. In this radiative environment cables change their electrical properties which directly affects the signal on the receiver side and in turn the measured beam parameters. This contribution describes a measurement setup at the superconducting CW accelerator ELBE that was used to investigate the degradation of coaxial cables under well-controlled conditions up to an accumulated dose of 94 kGy. Furthermore the acquired data up to 40 GHz of two coaxial cable samples are presented and the results are discussed.  
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