Abstract
In order to investigate the ion-optical parameters of the AECR-U injection line into the 88-Inch Cyclotron, an electrostatic-deflection-type emittance scanner has been designed and constructed. It allows fast on-line measurements, while tuning the ion beam through the cyclotron. Emittance measurements have been performed for various high charge state ions. First results indicate a strong mass dependence of the normalized beam emittance. For example the normalized rms emittance for protons (0.24 π · mm · mrad) is four times higher than for O6+ (0.06 π · mm · mrad) and about 8 times higher than Kr19+ (0.03 π · mm · mrad). Furthermore it was found, that the emittance values are approximately independent of the current at the medium ion beam intensities. The predominant factor on the beam emittance is shown to be the plasma stability. The emittance measurements and the results are discussed in the paper.
Published Version
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