Beam quality investigations for H- extraction at TRIUMF

The direct extraction of high intensities of H- ions from the TRIUMF cyclotron and their injection into an accumulator ring will impose demands on beam quality and thereby on the fields of the added extraction hardware and on the operation of the cyclotron. The fields of each of the extraction devices have been simulated in computer codes to estimate their influence on the final extracted emittance. Parameters controlling vertical emittance have been experimentally investigated to devise an optimum tuning procedure. Results of both computer simulations and experimental beam tests will be given. (author)