NSCL, East Lansing, Michigan, USA
Intense heavy ion beam acceleration by superconducting compact cyclotrons presents significant challenges since surfaces impacted by lost beam are subject to high thermal loads and consequent damage. High transmission efficiencies allow 0.7-1.0 kW beams to be routinely delivered for experiment at the NSCL, with minimal negative impact on reliability. Net beam transmission measured from just before the K500 to extracted beam from the K1200 can be about 30% depending on the ion used (factoring out the unavoidable loss due to the charge stripping foil in the K1200). Techniques and examples are discussed.
