|
Introduction to the Operation
of the KSU-CRYEBIS
|
|
|
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
stockli@phys.ksu.edu
Office Hours: Cardwell 17, Tu, Th 3-4 pm, and by appointment
|
Lab Instructor: |
Paul E. Gibson
Voice: 785-532-2650
Office: Cardwell 19
paul@phys.ksu.edu
|
|
- 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)
- 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
- 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
- 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
- decelerating S8+ to 1 keV/q, and repeating 2)
- 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.
|