[Acc_sem_comm] [EXTERNAL] Accelerator Seminar: Eric Lechner 6/3/21 11 am

[Tristan Jones via BlueJeans Network]

To join the meeting on a computer or mobile phone: https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_380219683-3Fsrc-3DtextEmail&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Go5UENzgixVXor8yH3HGLOkEsnbRfYycfEmE4poGuxo&m=3DvgDHndhCCngy6jTVOUGv1eX1BK0gcvz48T-jrKY5A&s=2tSLGy3eFWK2_1QDbpjbGfMOjfA9Q_sbTI1fiWnBmWg&e= 

Tristan Jones has invited you to a meeting.Phone Dial-in
+1.888.240.2560 (US Toll Free)
Global Numbers: https://urldefense.proofpoint.com/v2/url?u=https-3A__www.bluejeans.com_premium-2Dnumbers&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Go5UENzgixVXor8yH3HGLOkEsnbRfYycfEmE4poGuxo&m=3DvgDHndhCCngy6jTVOUGv1eX1BK0gcvz48T-jrKY5A&s=bk3L_zmZCGEGH9-QXs26Yj-s4dfN8p7EmHVbilmWFzw&e= 

Meeting ID: 380 219 683

Room System
199.48.152.152 or bjn.vc

Meeting ID: 380 219 683
Description:
Title: SRF surface resistance tuning of niobium via thermal diffusion of its native oxide 

Abstract:  
Interstitial thermal diffusion of several atomic species into the surface of niobium has resulted in extremely low RF surface resistance of superconducting niobium. Recently, Nb superconducting radio frequency cavities vacuum heat treated between 300-400°C for a few hours have exhibited very high quality factors (~5×1010 at 2.0 K). Our new secondary ion mass spectrometry measurements of O, N and C show this enhancement in RF surface conductivity is primarily associated with interstitial oxygen alloying via dissolution and diffusion of the native oxide. We analyzed the oxygen concentration depth profiles in the framework of Ciovati's model of oxygen decomposition and diffusion to quantify previously unknown parameters crucial in modeling this process for applications. Radio frequency measurements of a vacuum heat treated Nb superconducting radio frequency cavity confirm the minimized 

Want to test your video connection?
https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_111&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Go5UENzgixVXor8yH3HGLOkEsnbRfYycfEmE4poGuxo&m=3DvgDHndhCCngy6jTVOUGv1eX1BK0gcvz48T-jrKY5A&s=wm51VjyVEO45XzUy25Sj3elIeoGDuRTcay6XXm9Ab7U&e= 




-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/acc_sem_comm/attachments/20210526/1939780c/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: text/calendar
Size: 2534 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/acc_sem_comm/attachments/20210526/1939780c/attachment-0001.ics>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: invite.ics
Type: application/ics
Size: 2576 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/acc_sem_comm/attachments/20210526/1939780c/attachment-0001.bin>