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Wang, C.-X.

Paper Title Page
TUPLT145 Transverse Coupling Measurement using SVD Modes from Beam Histories 1470
 
  • C.-X. Wang
    ANL, Argonne, Illinois
  • R. Calaga
    BNL, Upton, Long Island, New York
  
  In this report we investigate the measurement of local transverse coupling from turn-by-turn data measured at a large number of beam position monitors. We focus on a direct measurement of coupled lattice functions using the Singular Value Decomposition (SVD) modes and explore the accuracy of this method. The advantages and shortcomings of this model-independent method for coupling measurement will be also discussed.  
TUPLT146 Techniques to Extract Physical Modes in Model-independent Analysis of Rings 1473
 
  • C.-X. Wang
    ANL, Argonne, Illinois
  
  SVD mode analysis is a basic techinique in Model-Independent Analysis of beam dynamics. It decomposes the spatial-temporal variation of a beam centroid into a small set of orthogonal modes based on statistical analysis. Although such modes have been proven to be rather informative, each orthogonal mode may not correspond to an individual physical source but a mix of several in order to be orthogonal. Such mixing makes it difficult to quantitatively understand the SVD modes and thus limits their usefulness. Here we report a new techinique to untangle the mixed modes in storage ring analysis based on the fact that most of the physical modes in a ring have identifiable characteristics in frequency domain.  
WEPLT144 New Characteristics of a Single-bunch Instability Observed in the APS Storage Ring 2170
 
  • C.-X. Wang
    ANL, Argonne, Illinois
  • K. Harkay
    ANL/APS, Argonne, Illinois
  
  In the Advanced Photon Source storage ring, a transverse single-bunch instability has long been observed that appears unique to this ring. Many of its features have been previously reported. New results have recently been obtained using beam centroid history measurements and analysis. These preliminary results provide more detailed information regarding the characteristics of this instability and could provide insight into the physics mechanism.