Rongli Geng - Jefferson Lab
Rongli Geng - Jefferson Lab
Rongli Geng - Jefferson Lab
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Example of Field Emitter Revealed by<br />
Surface Studies: Nb-O produced by EP<br />
Nb samples EP’ed together with 9-cell cavities<br />
• High-voltage tip scans surface for field emitter map.<br />
• Integrated SEM analysis for nature of field emitter.<br />
• Solution for removal: Lowering temperature; adding 30<br />
minutes acid flow after voltage off.<br />
<strong>Rongli</strong> <strong>Geng</strong><br />
Director's Review, March<br />
20, 2009, <strong>Jefferson</strong> <strong>Lab</strong><br />
Nb-O<br />
Dominant field emitters<br />
on as EP’ed Nb surface<br />
9
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