JRM Logo Introduction to the Operation

Introduction to the Operation of the KSU-CRYEBIS
Short Course Syllabus


Time &Locations: 29 June 1998
Cardwell 119 and J.R. Macdonald Laboratory
Provided Text: "The Operation of Electron Beam Ion Sources for Atomic Physics",
Martin P. Stockli, in
"Accelerator-Based Atomic Physics Techniques and Applications"
S. Shafroth and J. Austin, edts.,
(American Institute of Physics, Woodbury, New York, 1997), pg. 67-116.
Enrollment: Restricted to approximately 8 lab participants,
instructor's permission required.
Lecturer: Martin P. Stöckli,
Voice: 785-532-2661, Fax: 785-532-6806
Office Hours: Cardwell 17, Tu, Th 3-4 pm, and by appointment
Lab Instructor: Paul E. Gibson
Voice: 785-532-2650
Office: Cardwell 19
  • Lecture 1: (9:30-10:15) Production of Highly-charged Ions

    Motivation, direct electron impact ionization cross sections, evolution of charge states, ionization factor, maximum abundance of charge states, indirect ionization and maximum abundance of Ne like ions, ionization factor and confinement time, limits on useful confinement times, ion yields limited by the seed trap, other limits of the ion yield.
  • Lecture 2: (10:30-11:15) Operation of the KSU-CRYEBIS

    Optimization of high and low charge states, the operation of the 5T solenoid, the electron beam: current, current density, energy, seed gas injection, the ion switch yard, fast and slow expulsions.
  • Lecture 3: (2:30-3:15) Ion Beam Transport on the KSU-CRYEBIS

    Electrical vs. magnetic ion transport elements, focussing of the accelerator column, maximum platform voltage, refocusing to the target station, magnetic ion optical elements, electric einzel lenses, measuring the ion energy per charge and ripple, transporting very low ion energies.
  • Lecture 4: (3:30-4:15) Diagnostics on the KSU-CRYEBIS

    Charge state distributions, resolution and slits, tables with required analyzing fields, current measurements, gated current measurements, ion beam time structure measurements, measurements with multipliers, checking internal connections.
  • Laboratory: (5-7 hours, by appointment, June 30, July 1, 2, or 3)

    1. adjusting CRYEBIS for high (Xe35+) &low (S+) charge states:
      • changing seed gas supply,
      • changing solenoid field,
      • tuning electron beam transmission,
      • optimizing desired charge state,
      • measuring charge state distribution,
      • tuning slow and fast expulsions
    2. accelerating S8+ ions to 50 keV/q
      • changing platform high voltage supply,
      • detecting ions at switching magnet with BPM and FC
      • optimizing transport with platform elements,
      • identifying charge states with diagnostics
    3. transporting 50 kV S8+ ions to a target in a beam line
      • selecting proper supplies for switching magnet and lenses
      • finding ions with multiplier, slits, or Faraday cup,
      • determining peak count rates of detected particles
    4. decelerating S8+ to 1 keV/q, and repeating 2)
    5. transporting 1 kV/q S8+ ions to a target in a beam line and repeating 3)

A short course on Vacuum Physics is also being offered this summer.
Last updated on Monday, 13-Feb-2006.
Kansas State University

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