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Xiao, A.

Paper Title Page
TPAP036 Fitting the Luminosity Decay in the Tevatron 2434
 
  • E.S. McCrory, V.D. Shiltsev, A.J. Slaughter, A. Xiao
    Fermilab, Batavia, Illinois
  
  Funding: Operated by Universities Research Association Inc. under Contract No. DE-AC02-76CH03000 with the United States Department of Energy.

This paper explores the various ways in which the decay of the luminosity in the Tevatron have been fit. The standard assumptions of a fixed-lifetime exponential decay are only appropriate for very short time intervals. A "1/time" funcional form fits rather well, and is supported by analytical derivations. A more complex form, assuming a time-varying lifetime, produces excellent results. Changes in the luminosity can be factored into two phenomena: The luminosity burn-off rate, and the burn-off rate from non-luminosity effects. The luminous and the non-luminous burn rate are shown for stores in the Tevatron.

 
RPPP051 Characterization of a 6-km Damping Ring for the International Linear Collider 3147
 
  • A. Xiao
    Fermilab, Batavia, Illinois
  • L. Emery
    ANL, Argonne, Illinois
  
  Several damping ring designs for the International Linear Collider have been proposed recently. One particular design has a circumference of 6 km (hoping to take advantage of future kicker technology advances), TME arc cells, and 77 m of 2 T wigglers. Several beam dynamics characterizations and optimizations are reported. We used the accelerator code elegant for matching and tracking, and a 100-CPU linux cluster to provide high throughput.  
FPAT008 SDA-Based Diagnostic and Analysis Tools for Collider Run II 1099
 
  • V. Papadimitriou, T.B. Bolshakov, P. Lebrun, S. Panacek, A.J. Slaughter, A. Xiao
    Fermilab, Batavia, Illinois
  
  Funding: Fermilab (Department of Energy).

Operating and improving the understanding of the Fermilab Accelerator Complex for the colliding beam experiments requires advanced software methods and tools. The Shot Data Acquisition and Analysis (SDA) has been developed to fulfill this need. Data is stored in a relational database, and is served to programs and users via Web-based tools. Summary tables are systematically generated during and after a store. These tables, the Supertable, and the Recomputed Emittances and Recomputed Intensity tables are discussed here. This information is also accesible in JAS3 (Java Analysis Studio version 3).

 
FPAT012 Tevatron Beam Lifetimes at Injection Using the Shot Data Analysis System 1279
 
  • A. Xiao, T.B. Bolshakov, P. Lebrun, E.S. McCrory, V. Papadimitriou, A.J. Slaughter
    Fermilab, Batavia, Illinois
  
  The purpose of the Shot Data Acquisition and Analysis (SDA) system is to provide summary data on the Fermilab RunII accelerator complex and provide related software for detailed analyses. In this paper, we discuss such a specific analysis on Tevatron beam lifetimes at injection. These results are based on SDA data, tools and methodology. Beam lifetime is one of our most important diagnostics. An analysis of it can give information on intra beam scattering, aperture limitations, instabilities and most importantly beam-beam effects. Such an analysis gives us a better understanding of our machine, and will lead to an improved performance in the future.