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Operation of the ECR ion source Alice and its platform

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The operation of the electron cyclotron resonance (ECR) ion source Alice is described, with attention to the improved ion analysis and the new diagnostic equipment. Ion current peaks as small as tens of nA can be measured; resolving power is about 100. Routine operation is still restricted to gases, but prototypes of ovens have passed the first tests. Since currents are still rather limited (about 400 nA for ↑(132)Xe↑(18+), a new removable plasma chamber with increased inner diameter (63 mm), made in aluminum, is under construction. Preliminary analysis of charge state distribution of xenon isotopes shows good fits with an approximately thermodynamical distribution; a sort of effective chemical potentialμ↓(c) is defined from fit parameters; in the particular case shown here μ↓(c)# 390 eV. A decision to install a high voltage insulation transformer to allow platform operation up to Vp= 350 kV was made, and an adequate location is being found, with proper wall feedthroughs in design. # 1998 American Institute of Physics. S0034-6748(98)53102-4

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