This hollow cathode tip is commonly used within a hollow cathode electron source (HCES) for Mark gridless (End-Hall) ion sources. Compare to part numbers B17968/SP, C28079/MP, and IS17968.
1/4 inch tube diameter, 2.67 inch overall length.
No heater cable.
Internal patented low work function insert (Pat. No. 10,002,738).
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Lead Time: Typically 4 weeks if not in stock.