Abstract
The multipole/reflex discharge ion source ELSIRE delivered high-current heavy ion beams (20–50 mA) of low emittance, but with poor power- and gas-efficiencies. Therefore, a new version of the source, CORDIS, was constructed, based on the same discharge principle. The diameter of the discharge chamber was doubled, compared to ELSIRE, thus allowing enlarged extraction areas. At the same time, a modified magnetic multipole field leads to enhanced electron confinement, while a shift of the extraction plane increases the effective plasma density. The measurements show a reduction of discharge power and gas pressure by a factor of ten. Thus reliability and life-time are much improved and dc operation has also become possible. With 1.3 kW dc discharge power, the source life-time exceeds 80 h. Several test runs with single- and multi-aperture extraction systems will be discussed. The most prominent result amounts to 71 mA for xenon ions or 814 (mA) normalized current (proton equivalent).
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