<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Dear all,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
please see below a suggested speaker, title and abstract for an Accel. Seminar. Please let me know if you agree by Thursday.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Thanks,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Gigi<br>
</div>
<div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div id="appendonsend"></div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Garcia, Cougar A [US] (MS) <Cougar.Garcia@ngc.com><br>
<b>Sent:</b> Tuesday, October 20, 2020 5:12 PM<br>
<b>To:</b> Gianluigi Ciovati <gciovati@jlab.org>; Steven Mark Anlage <anlage@umd.edu><br>
<b>Cc:</b> Talanov, Vladimir V [US] (MS) <Vladimir.Talanov@ngc.com><br>
<b>Subject:</b> [EXTERNAL] RE: EXT :Re: Fwd: Fw: Invitation for an Accelerator Seminar at Jefferson Lab</font>
<div> </div>
</div>
<div lang="EN-US">
<div class="x_WordSection1">
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">Dr. Ciovati,</span></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">Of course! here is my abstract from ASC that covers what I would talk about:</span></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<b><u><span style="font-family:"Arial",sans-serif">Title: Correlation of complex surface impedance and vortex dynamics in Nb thin films of varying quality</span></u></b></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<b><u><span style="font-family:"Arial",sans-serif">Authors: </span></u></b><span style="font-family:"Arial",sans-serif">Cougar Garcia, Alex Sirota, Vladimir Talanov, Anna Herr<b><u></u></b></span></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;line-height:150%">
<b><u><span style="font-family:"Arial",sans-serif">Abstract:</span></u></b></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;line-height:150%">
<span style="font-family:"Arial",sans-serif"> It is important to characterize both the RF properties and vortex dynamics of thin films for superconducting device and circuit applications that operate in low magnetic field environments, and determine
the circuit performance. </span><span style="font-family:"Arial",sans-serif">Using a Parallel Plate Resonator Technique (PPR) [Taber1990],
</span><span style="font-family:"Arial",sans-serif">it has been shown the average vortex pinning constant (</span><span style="font-size:12.0pt; font-family:"Times New Roman",serif; top:4.5pt"><img id="x__x0000_i1025" width="23" height="21" data-outlook-trace="F:1|T:1" src="cid:image001.png@01D6A704.2248C330"></span><span style="font-family:"Arial",sans-serif">
and viscosity (</span><span style="font-size:12.0pt; font-family:"Times New Roman",serif; top:3.0pt"><img id="x__x0000_i1025" width="9" height="19" data-outlook-trace="F:1|T:1" src="cid:image002.png@01D6A704.2248C330"></span><span style="font-family:"Arial",sans-serif">)
can be extracted from the RF surface impedance measurements as a function of applied perpendicular magnetic field ([Pambianchi1993], [Golosovsky1994]).
</span><span style="font-family:"Arial",sans-serif">To date, only two groups ([Janjusevic2006], [Kwon2018]) have measured these properties for Niobium thin films, which is commonly used in superconducting devices and circuits. For electronics applications all
of the important vortex dynamics occur near the critical temperature (Tc); however, the earlier work only characterized these properties at low temperature. In this work, we measured complex surface impedance of 200-nm thick Nb films and extracted the vortex
pinning constant and viscosity in the framework of the Coffey-Clem unified theory as a function of temperature and magnetic field. Our samples had a range of Ginzburg-Landau parameter (</span><span style="font-size:12.0pt; font-family:"Times New Roman",serif; top:3.0pt"><img id="x__x0000_i1025" width="102" height="19" data-outlook-trace="F:1|T:1" src="cid:image003.png@01D6A704.2248C330"></span><span style="font-family:"Arial",sans-serif">),
and, for </span><span style="font-size:12.0pt; font-family:"Times New Roman",serif; top:3.0pt"><img id="x__x0000_i1025" width="51" height="19" data-outlook-trace="F:1|T:1" src="cid:image004.png@01D6A704.2248C330"></span><span style="font-family:"Arial",sans-serif">,
typical values of vortex pinning constant, viscosity, and RF surface resistance at 10 GHz and 5 mT were</span><span style="font-family:"Arial",sans-serif"> 2 kN/m^2, ~1e-8 N-s/m^2, and
</span><span style="font-family:"Arial",sans-serif">1.2 </span><span style="font-size:12.0pt; font-family:"Times New Roman",serif; top:3.0pt"><img id="x__x0000_i1025" width="24" height="19" data-outlook-trace="F:1|T:1" src="cid:image005.png@01D6A704.2248C330"></span><span style="font-family:"Arial",sans-serif">
</span><span style="font-family:"Arial",sans-serif">near the critical temperature (~0.85Tc), respectively. The vortex parameters and surface resistance (</span><span style="font-size:12.0pt; font-family:"Times New Roman",serif; top:3.0pt"><img id="x__x0000_i1025" width="238" height="19" data-outlook-trace="F:1|T:1" src="cid:image006.png@01D6A704.2248C330"></span><span style="font-family:"Arial",sans-serif">)
</span><span style="font-family:"Arial",sans-serif">values agree well with [Janjusevic2006] and [Kwon2018], and the surface impedance as a function of Ginzburg-Landau parameter and its implications on flux trapping will be discussed.</span></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">Thanks,</span></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">Cougar</span></p>
<p class="x_MsoNormal" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;">
<span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<br>
</div>
</div>
</div>
</body>
</html>