INITIAL EMITTANCE MEASUREMENTS OF THE SUPERCONDUCTING ELECTRON-CYCLOTRON-RESONANCE AT NSCL

We report on preliminary emittance measurements of oxygen and argon io ns extracted from the superconducting electron cyclotron resonance (SC ECR). For oxygen, charge states 1+ through 8+ have been measured for 1 00% intensity with the SCECR tuned to maximize highly charged ions, at a 10 kV extraction voltage. For argon, charge states 6+ through 14+ h ave been measured under the same conditions. For both species, both no rmalized and unnormalized emittances show the same trend-increasing wi th charge Q for low charge, and falling sharply for highly charged ion s. The increase in emittance with Q for low Q implies an expected magn etic field dependence. The decreasing emittance for high Q is unexpect ed, and possible explanations for this effect will be discussed.