Abstract
The Multi-user Tandem Laboratory (MTL) at LLNL is a general purpose laboratory for analysis using ion beam techniques. Our initial interest in AMS was for large throughput with modest precision. Toward this goal, we purchased a prototype GIC spherical ionizer source with a 60 sample cassette changer. The source has been extensively modified to increase reliability and to adapt it for AMS operation. The sample changing mechanism was completely rebuilt, pumping was increased in critical areas, electrical stress has been reduced in areas where failures were frequent and protection of insulators from cesium vapor has been increased. We are limiting the divergence to 20 mrad to match the present injection system and are only able to get about 50 μA of stable carbon beam in this configuration. Details of failures, changes to date and planned improvements will be discussed.
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