Keyword: synchrotron-radiation
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MOPG63 Recent Beam Size Measurement Result Using Synchrotron Radiation Inteferometer in TPS synchrotron, operation, radiation, shielding 217
  • M.L. Chen, H.C. Ho, K.H. Hsu, D.-G. Huang, C.K. Kuan, W.Y. Lai, C.J. Lin, S.Y. Perng, C.W. Tsai, T.C. Tseng, H.S. Wang
    NSRRC, Hsinchu, Taiwan
  Taiwan Photon Source (TPS) has operated in 2015. An optical diagnostic beam line is constructed in TPS 40th section for the diagnostics of the electron beam properties. One instrument of the optical diagnostic beam line is a synchrotron radiation interferometer, which is operated for monitoring the beam size. By improving the optical alignment and air disturbance, the beam size is performed stable. This paper presents the modifications and recent measurement results.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG63  
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MOPG71 Polarization Measurement and Modeling of Visible Synchrotron Radiation at Spear3 polarization, radiation, extraction, synchrotron 240
  • C.L. Li, W.J. Zhang
    East China University of Science and Technology, Shanghai, People's Republic of China
  • W.J. Corbett
    SLAC, Menlo Park, California, USA
  • Y.H. Xu
    DongHua University, Songjiang, People's Republic of China
  • W.J. Zhang
    University of Saskatchewan, Saskatoon, Canada
  Synchrotron radiation from dipole magnets is linearly polarized in the plane of acceleration and evolves toward circular polarization with increasing vertical observation angle. The intensity of the x-y field components can be modeled with Schwinger's theory for the angular-spectral power distribution. Combined with Fresnel's laws for reflection at a mirror surface, it is possible to model field polarization of visible SR light in the laboratory. The polarization can also be measured with a polarizer and quarter wave plate to yield Stokes' parameters S0-S3. In this paper we present measurements and modeling of the visible SPEAR3 SR beam in terms of Stokes' parameters and plot on the results on the Poincaré sphere.  
poster icon Poster MOPG71 [1.527 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG71  
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MOPG73 Transverse Beam Size Diagnostics using Brownian Nanoparticles at ALBA radiation, synchrotron, scattering, diagnostics 248
  • M. Siano, B. Paroli, M.A.C. Potenza
    Universita' degli Studi di Milano & INFN, Milano, Italy
  • A. Goldblatt, S. Mazzoni, G. Trad
    CERN, Geneva, Switzerland
  • U. Iriso, A.A. Nosych, L. Torino
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  In this work we describe a novel beam diagnostic method based on coherence characterization of broad-spectrum bending magnet radiation through the Heterodyne Near Field Scattering (HNFS) technique. HNFS is a self-referencing technique based on the interference between the transmitted beam and the spherical waves scattered by each particle of a colloidal suspension. The resulting single-particle interferogram shows circular fringes modulated by the spatio-temporal Complex Coherence Factor (CCF) of the radiation. Superposition of a number of these patterns results in a stochastic speckle field, from which spatial and temporal coherence information of the source can be retrieved in near field conditions. Here we describe the basics of this technique, the experimental setup mounted along the hard X-ray pinhole at the ALBA synchrotron light source, and the possibility of transverse electron beam size retrieval from the spatial coherence function of the emitted dipole radiation. We also show preliminary results concerning power spectral density of visible synchrotron radiation as obtained from temporal coherence.  
poster icon Poster MOPG73 [1.804 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG73  
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WEBL03 Beam Shape Reconstruction Using Synchrotron Radiation Interferometry radiation, synchrotron, coupling, simulation 589
  • L. Torino, U. Iriso
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  Synchrotron Radiation Interferometry (SRI) through a double-aperture system is a well known technique to measure the transverse beam size using visible light. In many machines the beam is tilted in the transverse plane, but the SRI technique only allows to directly measure the size of the projection of the beam shape along the axis connecting the two apertures. A method to fully reconstruct the beam in the transverse plane using SRI has been developed and successfully tested at the ALBA synchrotron light source. This report shows the full beam reconstruction technique and presents the results at ALBA. Moreover, we also discuss how this technique could improve the measurement of very small beam sizes, improving the resolution of standard SRI.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL03  
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WEPG63 Performance Evaluation of Molybdenum Blades in an X-ray Pinhole Camera emittance, synchrotron, radiation, electron 795
  • L.M. Bobb, A.F.D. Morgan, G. Rehm
    DLS, Oxfordshire, United Kingdom
  At Diamond Light Source transverse profile measurements of the 3 GeV electron beam are provided by x-ray pinhole cameras. From these beam size measurements and given knowledge of the lattice parameters the emittance, coupling and energy spread are calculated. Traditionally, tungsten blades are used to form the pinhole aperture due to the opacity of tungsten to x-rays in the keV spectral range. The physical properties of tungsten also make it difficult to work. To achieve the 25 micron x 25 micron aperture size required for high resolution measurements it is necessary to mount these tungsten blades in an assembly whereby the pinhole aperture size is defined by precisely machined shims. Here we propose to replace the tungsten blade and shim arrangement with machined molybdenum blades and evaluate the performance of the resulting imaging system.  
poster icon Poster WEPG63 [0.825 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG63  
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