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Hi Andrei,
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<div class="">This is an excellent strategy and the ultimate application of FFAs for recirculating system. I would love to see this realized some day. Dejan and I, and others, have talked about this a lot and it has been considered. Alas, there are space constraints.
Dejan, Scott, and Stephen, can probably tell more about the specific problems.</div>
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<div class="">All the best,</div>
<div class="">Georg</div>
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<div class="">On Dec 8, 2023, at 8:41 AM, Andrei Seryi via FFA_CEBAF_Collab <<a href="mailto:ffa_cebaf_collab@jlab.org" class="">ffa_cebaf_collab@jlab.org</a>> wrote:</div>
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<span style="color: rgb(31, 73, 125);" class="">Colleagues,<span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class="">I was talking to Thomas Roser last week at DESY about our design.<o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class="">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.<span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class="">The timing corrections of individual energies can be done by some closed bumps.<o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class="">Can this be considered?<span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class="">Thanks<o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class=""> Andrei<o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div>
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<b class=""><span class="">From:</span></b><span class=""><span class="Apple-converted-space"> </span>FFA_CEBAF_Collab <<a href="mailto:ffa_cebaf_collab-bounces@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">ffa_cebaf_collab-bounces@jlab.org</a>><span class="Apple-converted-space"> </span><b class="">On
Behalf Of<span class="Apple-converted-space"> </span></b>Ryan Bodenstein via FFA_CEBAF_Collab<br class="">
<b class="">Sent:</b><span class="Apple-converted-space"> </span>Thursday, December 7, 2023 11:35 AM<br class="">
<b class="">To:</b><span class="Apple-converted-space"> </span><a href="mailto:ffa_cebaf_collab@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">ffa_cebaf_collab@jlab.org</a><br class="">
<b class="">Subject:</b><span class="Apple-converted-space"> </span>[FFA_CEBAF_Collab] Alternative FFA Arc - A tech note describing a brainstorm<o:p class=""></o:p></span></div>
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Dear FFA Colleagues,<o:p class=""></o:p></div>
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Since we’ve been entertaining a lot of alternative options lately, I thought I’d add to the pile.<o:p class=""></o:p></div>
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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 class=""></o:p></div>
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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" originalsrc="https://jlabdoc.jlab.org/docushare/dsweb/View/Collection-55373" shash="YdphXD95or1f2Vdixn7O9BHJSNZ87pIJlQluRoxQ81qumxZET4b4cbinnvOfXOwL6HP9C7JgYEDENJSP0YF0zsf3xlpszdDJsCjh1PxQdZaDZbDQ2AEB7gHszWMpIVpp5uat7zTySZv63CqPM5BbN6oHyzmIQe2yrF1QI5kR+2U=" title="https://jlabdoc.jlab.org/docushare/dsweb/View/Collection-55373" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">https://jlabdoc.jlab.org/docushare/dsweb/View/Collection-55373</a><o:p class=""></o:p></div>
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Cheers!<o:p class=""></o:p></div>
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Ryan<o:p class=""></o:p></div>
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<span class="">Dr. Ryan Bodenstein (he/him)<o:p class=""></o:p></span></div>
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<span class="">Staff Scientist II – Center for Advanced Study of Accelerators (CASA)<o:p class=""></o:p></span></div>
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<span class=""><span id="cid:image002.jpg@01DA29B2.577369F0"><image002.jpg></span><o:p class=""></o:p></span></div>
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<span class="">12000 Jefferson Avenue<o:p class=""></o:p></span></div>
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<span class="">Newport News, VA 23606<o:p class=""></o:p></span></div>
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<span class="">United States of America</span><o:p class=""></o:p></div>
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