Optimizing Position Sensitivity of the Detection System for the St. George Recoil Mass Separator

POSTER

Abstract

The St. George recoil mass separator at the University of Notre Dame will be used to study ($p$,$\gamma$) reactions of astrophysical interest. A detection system for use with St. George, which utilizes energy and time-of-flight to identify detected particles, is being developed at Indiana University South Bend. An electrostatic mirror assembly is used to deflect secondary electrons produced by the passage of an ion through a thin foil onto a microchannel plate (MCP) detector, which registers the start time for the time-of-flight measurement. Simulations of the transport of the secondary electrons from the foil to the MCP detector have been carried out using SIMION, in order to determine how well the position of the ion at the foil is preserved by the electrostatic mirror. The effective position resolution of the electrostatic mirror assembly has been found to be sensitive to the pitch of a wire grid that accelerates the secondary electrons away from the foil. Position sensitivity for both the start detector and the stop detectors of the time-of-flight system will allow corrections based on the ion trajectory.

Authors

  • Luis Morales

    Indiana Univ. South Bend

  • Jerry Hinnefeld

    Indiana Univ. South Bend

  • Manoel Couder

    Univ. of Notre Dame

  • Chris Perkins

    Univ. of California at Berkeley, North Carolina Central U. (NCCU), Triangle Universities Nuclear Laboratory (TUNL), Los Alamos National Laboratory, Lawrence Livermore National Laboratory, SJSU, LLNL, United States Naval Academy, Annapolis, USA, University of Dallas, USA, University of Kentucky, USA, ASU, UNC/TUNL, Univ. Tennessee, ORNL/ORAU, ORNL, ORNL/ORAU/Warsaw Univ., Mississippi State Univ., Louisiana State Univ., ORNL/Warsaw Univ., Vanderbilt Univ., UNRIB/ORAU, Vanderbilt Univ./LBNL, Univ. Tennessee/Warsaw Univ., GANIL, CENBG/CNRS/IN2P3, ANL, U. Jyv\"alsky\"a, CENPA, U. Washington, TRIUMF, IFIC, CSIC-Univ. Valencia, Argonne Nat. Lab., The University of Tennessee at Knoxville, Dept. of Physics (TUNL), Duke University, USA, Wright Nucl. Structure Lab., Yale University, USA, Dept. of Nucl. Physics, Australian National University (ANU), Australia, Dept. Chemistry, University of Kentucky, USA, Dept. of Physics and Astronomy, University of Kentucky, USA, Dept. of Physics \& Astronomy and Chemistry, University of Kentucky, USA, Yale University, Bonn University, Germany, Rutgers University, Millsaps College, Texas A\&M University, Oak Ridge National Laboratory, Oregon State University, UC Berkeley, NSCL/MSU, TA\&MU, RIKEN, Japan, University of Tennessee, Knoxville, BHSU, Sanford Lab, UMass Lowell, LSU, UTK, UTK, ORNL, ORNL, ORAU, ORNL, ORAU, UW, Michigan State University, Pacific Northwest National Laboratory, University of Chicago, Osaka U., Tokyo Inst. of Tech., UND, Konan U, Kyoto U., Konan U., Tohoku U., KVI, University of Stuttgart, IFIN-HH, TUNL, University of Kentucky, TU-Darmstadt, Yale, Surrey, Istituto Nazionale Fisica Nucleare Laboratori Nazionali del Sud, Florida State University, University of Jyv\"askyla, NSCL / MSU, Hope College, Central Michigan University, Gettysburg College, Concordia College, Argonne National Laboratory and University of Chicago and JINA, Hebrew University, Argonne National Laboratory and Western Michigan University, Argonne National Laboratory and JINA, Western Michigan University, Argonne National Laboratory, Universidad Nacional Autonoma de Mexico, State Univ. of New York at Oswego, Department of Physics, State University of New York at Oswego, Physics Division, Oak Ridge National Laboratory, CNRS, Indiana University, LANL, CEA-Saclay, FRIB/MSU, Surrey, Mississippi State University, Technische Universitat Munchen, Univ. of Notre Dame, Univ. of Wisconsin - La Crosse, Kocaeli University, Turkey, RIKEN, NSCL, University of Notre Dame, ATOMKI, Hungary, The University of Alabama, Arizona State University, SUNY Stony Brook, United States Naval Research Laboratory, Ruhr-Universit\"at Bochum, UNC-Wilmington, Tulane U., MIT, Waterloo U., NIST, U. 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U., Chung-Ang U., Univ. of Stellenbosch, iThemba LABS, Univ. of Witwatersrand, iThema LABS, Univ. of Cape Town, Univ. of Witwatersand, KVI Univ. of Groningen, NSCL, Michigan State University, East Lansing, MI 48824, USA, Helmholtz-Insitut Mainz, Johannes Gutenberg-Universit\"at Mainz, D-55128 Mainz, Germany, KVI Groningen, U S Naval Academy, University of Surrey, Cyclotron Institute, Texas A\&M University, JIHIR, UNIRIB, ICN-UNAM, FSU, U. of Surrey, NSCL, MSU, Departments of Chemistry and Physics \& Astronomy, University of Kentucky, Lexington, KY 40506, School of Physics, Georgia Institute of Technology, USA, Dept. of Physics, University of Guelph, Canada, Dept. of Chemistry, University of Kentucky, USA, Depts. of Physics \& Astronomy and Chemistry, University of Kentucky, USA, UNIRIB/ORAU, ORAU, U Richmond, WNSL Yale, IKP Univ. Cologne, Univ. 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South Bend, Cyclotron Institute A\&M University, Westmont College, Oak Ridge National Lab, Kyoto University, Texas A\&M University Cyclotron Institute, NSCL, Michigan State University, Collider-Accelerator Division, Brookhaven National Laboratory, Institut f\"ur Physik, Universit\"at Mainz, Lousiana State University Baton Rouge, Colorado School of Mines, Golden, CO, Ohio University, Athens, OH, Rutgers University, Piscataway, NJ, University of Tennesse Knoxville, WFU and TUNL, UNC and TUNL, Iowa State University, University of Arizona, University of Toronto, Universita di Napoli, Universita degli Studi di Napoli ``Frederico II'' and INFN, University of Toronto, University of Notre Dame, Lousiana State University, University of Rochester, Institut fur Kernphysik, Darmstadt, WNSL-Yale U., U. of M., ANL/U. of M., Manchester, (Miss S.U.), (ORNL), (K.U. 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