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<p class="MsoNormal"><span style="color:#1F497D">Colleagues, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I was talking to Thomas Roser last week at DESY about our design.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">He suggested to avoid spreaders and combiners altogether, and instead use FFA-like beamline that adiabatically transition to regular FFA of the arcs. I.e., it will be FFA with varying cell length – starting from
longer near linacs, to shorter cell in the arcs. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The timing corrections of individual energies can be done by some closed bumps.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Can this be considered? <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> Andrei<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="mso-ligatures:none">From:</span></b><span style="mso-ligatures:none"> FFA_CEBAF_Collab <ffa_cebaf_collab-bounces@jlab.org>
<b>On Behalf Of </b>Ryan Bodenstein via FFA_CEBAF_Collab<br>
<b>Sent:</b> Thursday, December 7, 2023 11:35 AM<br>
<b>To:</b> ffa_cebaf_collab@jlab.org<br>
<b>Subject:</b> [FFA_CEBAF_Collab] Alternative FFA Arc - A tech note describing a brainstorm<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear FFA Colleagues,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Since we’ve been entertaining a lot of alternative options lately, I thought I’d add to the pile.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve spoken to a few of you about this, but I thought I’d write it down informally and share it with the group. Please note: this is no more than brainstorming put to paper (or digital paper, if you will). But it describes a few alternative
ways to design the FFA arcs. These ideas may or may not be feasible, and may or may not help things. They will likely cost more, but may be worth it.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Attached, you’ll find a copy of the tech note. If you are on JLab’s network, you can also find it here: <a href="https://jlabdoc.jlab.org/docushare/dsweb/View/Collection-55373" title="https://jlabdoc.jlab.org/docushare/dsweb/View/Collection-55373">https://jlabdoc.jlab.org/docushare/dsweb/View/Collection-55373</a>
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cheers!<o:p></o:p></p>
<p class="MsoNormal">Ryan<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="mso-ligatures:none">Dr. Ryan Bodenstein (he/him)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-ligatures:none">Staff Scientist II – Center for Advanced Study of Accelerators (CASA)<o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-ligatures:none"><img border="0" width="403" height="88" style="width:4.1979in;height:.9166in" id="Picture_x0020_1" src="cid:image002.jpg@01DA29B2.577369F0" alt="signature_3922909626"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-ligatures:none">12000 Jefferson Avenue<o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-ligatures:none">Newport News, VA 23606<o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-ligatures:none">United States of America</span><o:p></o:p></p>
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