VARIABLE ENERGY EXTRACTION FROM A NEGATIVE ION CYCLOTRON AND RELATED MEASUREMENTS.
CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS
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A scheme was developed for the variable energy extraction of 25 to 48 MeV protons into a common external beam transport system. The extraction is accomplished by stripping negative hydrogen ions with a thin foil. The magnetic field is held constant while the radius and azimuth of the stripping foil are chosen so that the trajectories for any energy cross at a common point outside the cyclotron vacuum tank. A small combination magnet placed at this crossover point bends the trajectories into a common beam transport system. The first order ion optic matrix representing the fringing field of the cyclotron was calculated at five different energies. An ion optic calculation of the beam transport system is given for two different phase space vectors at the stripper. Comparison is made with the observed operating values. Author
- Particle Accelerators