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Joe,</div>
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The dipole field maps for Arc 1 and Arc 2 have already been updated to include the anticipated error, so the expectation is that we are closer than before (others please correct me if I am wrong). We are planning on sending beam into Hall A 1st pass for the
energy calibration ahead of the spin dance to hopefully get a better idea of energy discrepancies. I think that this will help? Beam into Hall possibly by Friday next week for energy measurement, if all goes well, if of course Hall A is still okay with this. </div>
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Thanks,</div>
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-Brian</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> BTeam <bteam-bounces@jlab.org> on behalf of Joe Grames <grames@jlab.org><br>
<b>Sent:</b> Wednesday, November 13, 2019 10:28 PM<br>
<b>To:</b> Yves Roblin <roblin@jlab.org>; bteam@jlab.org <bteam@jlab.org><br>
<b>Cc:</b> Simona Malace <simona@jlab.org>; Javier Gomez <gomez@jlab.org>; Stepan Stepanyan <stepanya@jlab.org>; Dave Gaskell <gaskelld@jlab.org><br>
<b>Subject:</b> Re: [BTeam] B-Team Meeting to discuss new schedule</font>
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<b style="color:rgb(50,49,48)">Mike, Brian</b><span style="color:rgb(50,49,48); background-color:rgb(255,255,255); display:inline!important"><span> </span>- please include Simona, Stepan, Dave in your scheduling discussions, since their support is required
to validate the machine energy viz a viz the spin dance.</span></div>
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Since the purpose of <b><i>this</i></b> early spin dance is to belt and suspenders how precisely we set the machine energy, then it seems we ought to complete it <b><i>prior</i></b> to starting physics, right? Your<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> attached
schedule shows Halls B/D starting physics on 11/25, before the spin dance on 11/27.</span></div>
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That said, the spin dance is going to yield one of three cases:</div>
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<li><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif"><span style="">nailed it => great, move on...</span></font></li><li><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif"><span style="">good enough => w/ A longitudinal, Halls B&C say polarization is close enough => great, move on...</span></font></li><li><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif"><span style="">not good enough => w/ A longitudinal, Physics requests a machine energy adjustment to satisfy B&C</span></font></li></ol>
<div><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif"><span style="">In
<b>case #3</b> have you already agreed how to react? I imagined the response would be to use the Hall B or C spin dance data to inform a <0.1% adjustment to the linac energies. Why like this? In broad stroke, each ~10 deg correction at 5-pass incurs ~1
deg change at 1-pass. For example, changing machine energy to correct 20 deg error at 5-pass incurs ~2 deg change at 1-pass, or thereabouts. When you then fix 1-pass with the Wien to satisfy longitudinal polarization then 5-pass is now only "wrong" by
~2 deg, not 20 deg, which is tolerable, i.e. cos(2)~0.999 vs. cos(20)~0.940. That's the high level argument I have in mind.</span></font></div>
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<div><span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">I have a conference call + meeting Friday 1-3pm, so glad to discuss any of this before or after the b-team mtg,</span><br>
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<div><span style="">Joe</span><br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> BTeam <bteam-bounces@jlab.org> on behalf of Yves Roblin <roblin@jlab.org><br>
<b>Sent:</b> Wednesday, November 13, 2019 6:14 PM<br>
<b>To:</b> bteam@jlab.org <bteam@jlab.org><br>
<b>Subject:</b> [BTeam] Fwd: B-Team Meeting to discuss new schedule</font>
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<div dir="auto" style="font-size:85%; color:#575757">Sent from my Verizon, Samsung Galaxy smartphone</div>
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<div>From Camille Ginsburg:</div>
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Dear Colleagues,</div>
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Let's have a special B-Team meeting Friday 15.Nov. at 1pm in the MCC conference room to discuss the new schedule Mike A. and Brian put together (please see attachment). The goal is to check that the re-start schedule is as accurate as possible, and check whether
anything can be run in parallel or otherwise optimized so we can get to physics sooner. Clearly we must not compromise the quality of necessary work. By Monday I will give the experimenters our estimate for the physics start delay.</div>
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If you have a related Atlis, please be sure to attend or send a representative.</div>
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Thanks,<br>
Camille</div>
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