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Low-T Baking at Cornell

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Presentation on theme: "Low-T Baking at Cornell"— Presentation transcript:

1 Low-T Baking at Cornell
J. T. Maniscalco CLASSE, Cornell University 8/7/2019 James Maniscalco

2 Overview LTE1-14: 800 °C UHV, 120 °C N2 48 hr
+ 75 °C 6 hr in situ LTE1-15: 800 °C UHV, 120 °C UHV 48 hr + HF rinse STE1-1 (2.6 GHz): 800 °C UHV, 160 °C N2 48 hr + HF rinse, + 75 °C 6 hr (furnace) 8/7/2019 James Maniscalco

3 In situ baking Baking setup:
Cavity assembled on insert + pumped down (ion pump) Instrumentation removed Insulating box assembled, thermocouples mounted on cavity PID controller maintains setpoint 8/7/2019 James Maniscalco

4 LTE1-14: 800 °C UHV, 120 °C N2 48 hr 120 °C N treatment decreased quench field, increased Q Decrease in RBCS 75 °C treatment restored quench field, lowered high field Q (FE activated) Increase in R0 – more trapped flux? 2K results 8/7/2019 James Maniscalco

5 LTE1-15: 800 °C UHV, 120 °C UHV 48 hr 75 °C treatment improved quench field, lowered Q 8 MV/m) Increase in R0 – more trapped flux? Slight increase in RBCS Low R0, lower quench field restored by HF rinse Subsequent 75 °C gives no change 2K results 8/7/2019 James Maniscalco

6 STE1-1 (2.6 GHz): 160 °C HF + 75 °C (in furnace): Decrease R0, RBCS
Increase quench field 2K results 8/7/2019 James Maniscalco

7 Quench field (+/- change)
Overview of results Cavity Treatment protocol Quench field (+/- change) Notes LTE1-14 120 °C UHV 48 hours 28 MV/m 120 °C N2 48 hours 25 MV/m (-3) Lower RBCS … + 75 °C 6 hours in situ 28 MV/m (+3) FE activated, maintained low RBCS LTE1-15 25 MV/m 35 MV/m (+10) FE activated, Higher RBCS … + HF rinse 25 MV/m (-10) FE removed, lower R0 … + 75 °C 25 MV/m (+0) No change STE1-1 (2.6 GHz) 160 °C N2 48 hours 14 MV/m … + HF + 75 °C 6 hours 23 MV/m (+9) Decrease R0 and RBCS, no FE 8/7/2019 James Maniscalco

8 Thanks for your attention!
Acknowledgements: DOE ILC Cost Reduction (1.3 GHz tests) NSF Award (2.6 GHz tests) NSF CBB (travel to TRIUMF) See also: “Low-temperature baking…”, M. Ge, et al. LINAC 2018 8/7/2019 James Maniscalco

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