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The ion source is optimized on 40Ar9+ (black spectrum). This is a reference spectrum with 160 µA of Ar9+. After a plasma chamber replacement, the ion source is validated if the Ar9+ beam intensity is greater or equal to 120 µA. A record intensity of 245 µA has been reported on the graph below (red spectrum) although no clear conclusion could be made : much better distribution due to a magnesium wall coating effect, or due to the higher RF power injected into the plasma ?
Phoenix V2 - 18 GHz
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SPIRAL 2
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2016-04-18 15:02. Best Ar spectrum optimized on 40Ar14+ (46µA) obtained at SPIRAL2 with the Phoenix-V2 ion source.
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