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<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Go5UENzgixVXor8yH3HGLOkEsnbRfYycfEmE4poGuxo&m=3DvgDHndhCCngy6jTVOUGv1eX1BK0gcvz48T-jrKY5A&s=QySooJd5dMHVXJI7lS1L5WiS3wikWd2aBUaE8ehTv8k&e=">
<img src="https://static.bluejeans.com/z73/custom-assets/enterprise/3308/enterprise_logo/e33c250e7b214756978f04869a6fc8d0.png" alt="Blue Jeans" style="border:none;">
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<a href="mailto:tristan@jlab.org">Tristan Jones</a> has invited you to a meeting. <br>
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<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_380219683-3Fsrc-3DhtmlEmail&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Go5UENzgixVXor8yH3HGLOkEsnbRfYycfEmE4poGuxo&m=3DvgDHndhCCngy6jTVOUGv1eX1BK0gcvz48T-jrKY5A&s=0fHLOmHY4bBryI-DGb0lqLt6UhzUH6GVzfZEdcqmFoU&e=" style="font-family:Helvetica,sans-serif;border-radius:2px;background:#0b88e6;height:50px;line-height: 50px;text-align:center;color:#fff;font-size:16px;width: 200px;font-weight:bold;margin:auto;display:inline-block;padding:0 20px;text-decoration:none;" target="_blank">
Join Meeting
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<span>(Join from computer or phone)</span>
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<b>Phone Dial-in</b><br>
<a href="tel:+1.888.240.2560">+1.888.240.2560</a> (US Toll Free)<br>
(<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.bluejeans.com_premium-2Dnumbers&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Go5UENzgixVXor8yH3HGLOkEsnbRfYycfEmE4poGuxo&m=3DvgDHndhCCngy6jTVOUGv1eX1BK0gcvz48T-jrKY5A&s=bk3L_zmZCGEGH9-QXs26Yj-s4dfN8p7EmHVbilmWFzw&e=">Global Numbers</a>)<br><br>
Meeting ID: 380 219 683<br>
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<b>Room System</b><br>
199.48.152.152 or bjn.vc<br><br>
Meeting ID: 380 219 683<br>
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<span style="color:#666666">Description:</span><br>
Title: SRF surface resistance tuning of niobium via thermal diffusion of its native oxide <br /><br />Abstract: <br />Interstitial thermal diffusion of several atomic species into the surface of niobium has<br />resulted in extremely low RF surface resistance of superconducting niobium. Recently, Nb<br />superconducting radio frequency cavities vacuum heat treated between 300-400°C for a few<br />hours have exhibited very high quality factors (~5×1010 at 2.0 K). Our new secondary ion<br />mass spectrometry measurements of O, N and C show this enhancement in RF surface<br />conductivity is primarily associated with interstitial oxygen alloying via dissolution and<br />diffusion of the native oxide. We analyzed the oxygen concentration depth profiles in the<br />framework of Ciovati's model of oxygen decomposition and diffusion to quantify previously<br />unknown parameters crucial in modeling this process for applications. Radio frequency<br />measurements of a vacuum heat treated Nb superconducting radio frequency cavity confirm<br />the minimized
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<span style="color:#666666">Want to test your video connection?</span><br>
<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_111-3Fll-3Den&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Go5UENzgixVXor8yH3HGLOkEsnbRfYycfEmE4poGuxo&m=3DvgDHndhCCngy6jTVOUGv1eX1BK0gcvz48T-jrKY5A&s=WpPjzhoQX79H6fbbZtBNFCFcqpfx_H89pmV5sZigEb4&e=">https://bluejeans.com/111</a>
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<img src="http://meeting.bluejeans.com/wf/open?upn=dZXZro7Cp3Z2rNuTIcGwKSlP5zbmKubxIZgW19nICOd7o-2Bh-2FGlzPrWHNeYR8X1FZBJn0FmfOA4clkwvLEPlEFERBvSWWRZnggV1hE9sEumArdR9BklPWDp3bA22S2hjazByOvAr7mtXUVwAAIPXqdvh3pldGXgwyWaqHG287lqhciuq4JtG0a1Il2dwdcQ674NZ0FNBFdZY1uic-2BApvdURzwBBRBXVFgV4SoTKpdBMs-3D" alt="" width="1" height="1" border="0" style="height:1px !important;width:1px !important;border-width:0 !important;margin-top:0 !important;margin-bottom:0 !important;margin-right:0 !important;margin-left:0 !important;padding-top:0 !important;padding-bottom:0 !important;padding-right:0 !important;padding-left:0 !important;"/>