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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">Tristan,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif">We want to schedule an Accelerator seminar on May 3<sup>rd</sup> for Bruno Muratori (<a href="mailto:bruno.muratori@stfc.ac.uk">bruno.muratori@stfc.ac.uk</a>) I will try to get
a teaser slide from him. We need to try to reserve F113 for 11:00 on that day if it is available. If it is not, we can try L102 or a different time. Note that Friday is not our usual seminar day but his travel plans do not allow a Thursday date. The abstract
for the seminar is below. There is a photo of him on his web page at:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><a href="https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.astec.stfc.ac.uk%2FPages%2FBruno-Muratori-Senior-Accelerator-Physicist.aspx&data=02%7C01%7C%7C61e5b4de54004999988608d6c342caa8%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636911088967478087&sdata=ZQMsJVCzvG3F61LC5hiVd48kp2IY55ebr9x4iLlp3Qw%3D&reserved=0" originalsrc="https://www.astec.stfc.ac.uk/Pages/Bruno-Muratori-Senior-Accelerator-Physicist.aspx" shash="iAYZPZpp0Ph58be896dXCFQ7P2kg1bphlPR/uC3zOkTTlrgTBuOvKweXAj92NMDa1lUAxZw8Svc2AE1Ikv9x0WE5nGi3vKtFasTKaO8BY2OYsDgp15ezsXiDVNOv3ZYTNJt85r86xmVHCznn9fLDB+/6SJnWU+aqWWDRt0oexJg=">https://www.astec.stfc.ac.uk/Pages/Bruno-Muratori-Senior-Accelerator-Physicist.aspx</a><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman",serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman",serif;color:black">Apparently he would like to come down on May 2<sup>nd</sup> from Cornell and return there on Sunday. We can cover at least one day of lodging and expenses and can cover the
plane fare for the trip. Can you contact him to make arrangement? Thanks.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman",serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman",serif;color:black">Steve Benson<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman",serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:14.0pt;font-family:"Times New Roman",serif;color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:14.0pt;font-family:"Times New Roman",serif;color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:14.0pt;font-family:"Times New Roman",serif;color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:14.0pt;font-family:"Times New Roman",serif;color:black">Multipole Fringe Fields</span></b><span style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:8.0pt;font-family:"Times New Roman",serif;color:black"> </span><span style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:8.0pt;font-family:"Times New Roman",serif;color:black">Bruno Muratori, ASTeC, Daresbury Laboratory (STFC) & Cockcroft Institute, UK</span><span style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black"> </span><span style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black">When creating an initial model of an accelerator, one usually has to resort to a hard edge model for the quadrupoles and higher order
multipoles at the start of the project. Ordinarily, it is not until much later on that a field map for the given multipoles becomes available. This can be rather inconvenient when dealing with particularly thin elements or elements which are rather close together
in a beamline as the hard edge model is usually inadequate for the level of precision desired. For example, in the EMMA project, the two types of quadrupoles used are so close together that they are usually described by a single field map or via hard edge
models. The first method has the desired accuracy but was not available at the start of the project and the second is known to be a rough approximation. An analytic expression is derived and presented for fringe fields for a multipole of any order. The theory
is then successfully applied to the EMMA quadrupoles as well as the LHC inner triplet quadrupoles. Future work and possible extensions will also be discussed.</span><span style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:black">Stephen Benson
</span><o:p></o:p></p>
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