Recent 160 C “N infusion” impurity doping results

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Presentation transcript:

Recent 160 C “N infusion” impurity doping results J. T. Maniscalco CLASSE, Cornell University 2/25/2019 James Maniscalco

High-frequency results SC-06: 800 C degas UHV 3 hr, 160 C UHV 3 hr, 160 C 40 mTorr N2 96 hr No post-chemistry 2 K 2/25/2019 James Maniscalco

High-frequency results SC-06: 800 C degas UHV 3 hr, 160 C UHV 3 hr, 160 C 40 mTorr N2 96 hr HF rinse (~5 nm removal) 2 K 2/25/2019 James Maniscalco

High-frequency results RDTTD-4: 800 C degas UHV 3 hr, 160 C UHV 3 hr, 160 C 40 mTorr N2 48 hr No post chemistry 2 K 2/25/2019 James Maniscalco

High-frequency results RDTTD-4: 800 C degas UHV 3 hr, 160 C UHV 3 hr, 160 C 40 mTorr N2 48 hr 2x HF rinse (~10 nm removed) 2 K 2/25/2019 James Maniscalco

High-frequency results RDTTD-4: 800 C degas UHV 3 hr, 160 C UHV 3 hr, 160 C 40 mTorr N2 48 hr 2x HF rinse (~10 nm removed) + 100 nm VEP Similar Q @ low field, improved quench field High residual resistance – potentially high trapped flux 2/25/2019 James Maniscalco

High-frequency results SIMS results indicate Ti contamination (SC-06 witness sample) Separated by 2 layers of Nb foil (caps, foil box) – maybe much higher on cavity surface 2/25/2019 James Maniscalco