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

We report on preliminary emittance measurements of oxygen and argon ions extracted from the superconducting electron cyclotron resonance (SCECR). For oxygen, charge states 1+ through 8+ have been measured for 100% intensity with the SCECR tuned to maximize highly charged ions, at a 10 kV extraction voltage. For argon, charge states 6+ through 14+ have been measured under the same conditions. For both species, both normalized and unnormalized emittances show the same trend-increasing with charge Q for low charge, and falling sharply for highly charged ions. The increase in emittance with Q for low Q implies an expected magnetic field dependence. The decreasing emittance for high Q is unexpected, and possible explanations for this effect will be discussed.