How far is the temperature dropping?
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only by 2 degrees.
We think the extractor lens was shorting out when a voltage was applied to it.
Managed to resolve by removing the source and cleaning the ion body, extractor lens, extractor lens insulator, ion focus lens, lens insulator and entrance lens. They were already cleaned but were not rinsed enough to remove any excess aluminium oxide during the cleaning process.
After rinsing with water and hexane (just in case there was an organic contaminant).
Now it's working great.