Keyword: synchrotron-radiation
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TUPP031 Electron Beam Size Measurements Using the Heterodyne Near Field Speckles at ALBA radiation, experiment, synchrotron, scattering 378
 
  • M. Siano, M.A.C. Potenza
    Universita’ degli Studi di Milano & INFN, Milano, Italy
  • U. Iriso, C.S. Kamma-Lorger, A.A. Nosych
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  • S. Mazzoni, G. Trad
    CERN, Geneva, Switzerland
  • B. Paroli
    Universita’ degli Studi di Milano, Milano, Italy
 
  Experiments using the heterodyne near field speckle method (HNFS) have been performed at ALBA to characterize the spatial coherence of the synchrotron radiation, with the ultimate goal of measuring both the horizontal and vertical electron beam sizes. The HNFS technique consists on the analysis of the interference between the radiation scattered by a colloidal suspension of nanoparticles and the synchrotron radiation, which in this case corresponds to the hard x-rays (12keV) produced by the in-vacuum undulator of the NCD-Sweet beamline. This paper describes the fundamentals of the technique, possible limitations, and shows the first experimental results changing the beam coupling of the storage ring.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP031  
About • paper received ※ 06 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP038 Observation of Microbunching Instabilities using THz Detector at NSLS-II detector, radiation, synchrotron, dipole 624
 
  • W.X. Cheng
    ANL, Lemont, Illinois, USA
  • B. Bacha, G.L. Carr
    BNL, Upton, Long Island, New York, USA
 
  Microbunching instabilities have been observed in several light sources with high single bunch current stored. The instability is typically associated with threshold beam currents. Energy spread and bunch length are increasing above the thresholds. Recently, a terahertz (THz) detector was installed at the cell 22 infrared (IR) beamline at NSLS-II storage ring to study the micro-bunch instabilities. The IR beamline has wide aperture allowing long-wavelength synchrotron radiation or microwave signal propagate to the end station, where the detector was installed. The detector output signal has been analyzed using oscilloscope, spectrum analyzer and FFT real-time spectrum analyzer. Clear sidebands appear as single bunch current increases and the sidebands tend to shift/jump. We present measurement results of the THz detector at different nominal bunch lengths and ID gaps.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP038  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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