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<div dir="ltr">Dear Jay,</div>
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<div dir="ltr">I could translate the energy loss due to synchrotron radiation into the power loss using your beam currents very easily.</div>
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<div dir="ltr">Best from,</div>
<div dir="ltr">Dejan</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> FFA_CEBAF_Collab <ffa_cebaf_collab-bounces@jlab.org> on behalf of Jay Benesch via FFA_CEBAF_Collab <ffa_cebaf_collab@jlab.org><br>
<b>Sent:</b> Friday, June 24, 2022 3:48:44 PM<br>
<b>To:</b> Brooks, Stephen <sbrooks@bnl.gov><br>
<b>Cc:</b> ffa_cebaf_collab@jlab.org <ffa_cebaf_collab@jlab.org>; Douglas Higinbotham <doug@jlab.org><br>
<b>Subject:</b> Re: [FFA_CEBAF_Collab] [EXTERNAL] Re: FFA@CEBAF WG mtg. this Friday, June 24 at 11:00 am</font>
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<div class="PlainText">Colleagues,<br>
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One reason I've been pushing 4 EM at 1200 MeV and four FFA passes to ~20 <br>
GeV is current capability. At best the CMs can be pushed to ~720 uA <br>
total beam current. Two halls at 45 uA each, eight passes totals 720 <br>
uA. If we're limited to 500 uA because a heat exchanger in the beam <br>
dump system is not upgraded and we can't lower cavity input Qs, 31.25 uA <br>
for each of two high current halls on last pass. At 11 passes total, <br>
22.7 uA/hall at 500 uA total, 32.7 uA/hall at 720 uA total. 900 kW <br>
power limit per dump, so 45 uA at 20 GeV just works, while higher <br>
energies require less current. A lot of the suggestions I've seen from <br>
the high current halls assume high luminosity aka beam current.<br>
<br>
Jay<br>
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