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- R.A. Baartman, F.W. Bach, I.V. Bylinskii, J.F. Cessford, G. Dutto, D.T. Gray, A. Hurst, K. Jayamanna, M. Mouat, Y.-N. Rao, W.R. Rawnsley, L.W. Root, R. Ruegg, V.A. Verzilov
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
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In 2001, after 25 years of smooth cyclotron operation with up to ~200 μA H¯ acceleration, developments towards higher intensities became compelling because of the ISAC expansion. Recently average current of 300 μA, within a nominal ~90% duty cycle, was routinely achieved. Beam availability was 90-94% over the last five years. Development highlights are discussed in the paper. These include: ion source and beam transport re-optimized for this cyclotron acceptance; the 12 m long vertical injection line section was redesigned to accommodate higher space charge. In the centre region, a water cooled beam scraper was installed to absorb unwanted phases; other electrodes were realigned. Other activities were aimed at beam stability enhancement for ISAC. This included: reducing νr = 3/2 resonance effects at 420 MeV, stabilizing the intensity of the primary beam through pulser feedback regulation and improving beam quality at the target through beam optics optimization and target position stability feedback, etc. Extraction was also improved, using special stripping foils.
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