Cresting Algorithm Using Fourier Analysis of Beam Position for CEBAF Accelerator

POSTER

Abstract

The Continuous Electron Beam Accelerator Facility (CEBAF) accelerator contains two linear accelerators with Radio frequency (RF) cavities to accelerate electrons. For this to happen, the maxima of the sinusoidal electric fields in each cavity must be precisely matched to the timing of the particle's trajectories. Optimization of the beam energy is achieved by modulating the phase of cavities one at a time until the electrons are observed have the maximum energy. The focus of this project is to improve the process of finding the crest (maxima) phase of multiple cavities by modulating several cavities simultaneously. This was done by modulating the phase of each cavity at a different frequency and observing the position of the beam. The position of the beam over the period of modulation was then Fourier Transformed, producing peaks at the frequencies that corresponded to the different cavities. This was repeated with different amplitudes of modulation to fit a relationship between the amplitude of modulation and the Fourier Transform spike amplitude, which contained phase information. It has been shown that multiple cavities can be crested at the same time through the phase modulation of cavities at different frequencies and Fourier transforming the positions of the resulting beam. This has ramifications for accelerator operation because it dramatically decreases tuning time needed for beam optimization.

Authors

  • Ryan Roussel

    None

  • Adam Bernstein

    Indiana University, University of California, San Diego, Los Alamos National Laboratory, Jefferson Lab, University of Virginia, Ohio University, Los Alamos National Lab, Yale University, Lawrence Berkeley National Laboratory, Oak Ridge Associated Universities, Oak Ridge National Laboratory, Tennessee Technological University, Colorado School of Mines, Louisiana State University, University of Tennessee, Rutgers University, Lawrence Livermore National Laboratory, UC Berkeley, RCNP, Osaka Univ., Osaka 567-0047, U of ND, ND, IN-46556, Dept. of Phys., Tohoku Univ., Sendai 980-8578, Univ. of ND, ND, IN-46556, Dept. of Phys., Kyoto Univ., Kyoto 606-8502, Dept. of Phys., Konan Univ., Kobe 568-8501, JAEA, Kyoto 619-0215, Japan, CNS, Univ. of Tokyo, Tokyo 113-0033, Japan, CYRIC, Tohoku Univ., Sendai 980-8578, Japan, Dept. of Phys., Konan Univ., Kobe, 568-8501, Japan, RCNP, Osaka Univ., Osaka 567-0047, Japan, Hebrew University, Jerusalem, Argonne National Laboratory, Argonne National Laboratory and Western Michigan Univesity, Laboratorio Tandar, Argentina, Michigan State University, Texas A\&M University, National Nuclear Data Center, Brookhaven National Laboratory, WNSL, TAMU, LLNL, University of Richmond, UM-DAE Centre for Excellence in Basic Sciences, University of Maryland, Univerisity of Massachusetts Lowell, University of Massachusetts Lowell, U.S. Naval Academy, CSNSM, University of Jyvaskyla, University of Edinburgh, University of Kentucky, Massachusetts Institute of Technology, ORNL Reactor and Nuclear Systems Division, Tennessee Tech. Univ., Beihang Univ., ANL, U. Chicago/ANL, U. Manitoba, Northwestern U., McGill U./ANL, Department of Applied Mathematics and Sciences, Khalifa University of Science, Technology \& Research, Indian Institute of Technology Ropar, NSCL, JINA, Department of Physics and Astronomy, Michigan State University, Physics Department, Kalamazoo College, Department of Physics, University of Notre Dame, Notre Dame, IN, Uppsala University, Kocaeli University, University of Notre Dame, College of William and Mary, U. San Luis Potosi, U. Maryland, TRIUMF, Laboratori Nazionali del Sud-INFN, RIKEN Nishina Center, CEA-DAM, Yale University, USA, University of Cologne, Germany, University of Richmond, USA, Yale University, USA / TU Darmstadt \& GSI, Germany, Yale University, USA / University of Cologne, Germany, US Naval Academy, Department of Physics, U.S. Naval Academy, Annapolis, MD 21402, USA, Argonne National Laboratory, Argonne, IL 60439, USA, Department of Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA, Bhabha Atomic Research Centre, India, Univ. of Tennessee, NBI, Denmark, Mississippi State Univ., Univ. of Tennessee (Knoxville), Mississippi State University, Univ. of Kentucky, Univ. of Notre Dame, Univ. of Wisconsin - La Crosse, STARS-LIBERACE Collaboration, Atomic Energy of Canada Limited, Sandia National Laboratory, UC Davis, University of Connecticut, University of Massachusetts Amherst, California State University, Long Beach, University of Manitoba, Institut fuer Kernphysik, University of Cologne, 50937 Cologne, Germany, Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06511, USA, Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06511, USA/NSCL, MSU, USA, Brookhaven National Laboratory, University of Massachusetts, Lowell, UGCDAE-CSR, Kolkata, India, SINP, Kolkata, India, BARC, Mumbai, India, TIFR, Mumbai, India, CSNSM, U P-Sud and CNRS/IN2P3, Orsay, France, ANL, Argonne, USA, U of Notre Dame, Notre Dame, USA, Charles University, Prague, Czech Republic, LANL, Georgia Institute of Technology, USA, United States Naval Academy, USA, University of Dallas, USA, University of Guelph, Canada, University of Kentucky, USA, University Santiago de Compestela, Spain, Hope College, NSCL, Michigan State University, University of North Florida, National Superconducting Cyclotron Laboratory, Michigan State University, Florida State University, INFN, NSCL/Michigan State Univ, Department of Physics and the Joint Institute for Nuclear Astrophysics, University of Notre Dame, Duke University and TUNL, Duke University, North Carolina State University and TUNL, GSI, FIAS, TU-Darmstadt, Physics Department E12, TU Munich, Department of Physics, University of Tokyo, Institute for Nuclear Physics, University of Cologne, NSCL, NSCL/Rutgers University, ORNL, University of Tennessee/LLNL, University of Tennessee/TRIUMF, Sungkyunkwan University/ORNL, University of Kentucky, Lexington, KY 40506, Triangle Universities Nuclear Laboratory, George Washington University, York U., IKP Cologne, NSCL/MSU, Radiation Monitoring Devices Inc., Colorado Sch. Mines, Rutgers, Louisiana State U., U. 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Richmond, St. Marys, Rutgers University and University of Surrey, California Science \& Engineering Corporation, McGill U., ANL, Northwestern U., ANL, UChicago, LLNL, UC Berkeley, University of California Berkeley, University of Liverpool, Pennsylvania State University