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Hi Stephen,
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<div>That initial number came from me; a corrector every other cell….which you feel is too sparse. How about one corrector per cell? I think we need more thorough study, perhaps a MC simulation to quantify.</div>
<div>We will further tackle it on Friday…Feel free to lead the discussion…</div>
<div>Thanks.</div>
<div><br>
</div>
<div>Cheers,</div>
<br>
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<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt;"><span style="background-color: rgba(255, 255, 255, 0);">Alex<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt;"><span style="background-color: rgba(255, 255, 255, 0);">S. Alex Bogacz,<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt;"><span style="background-color: rgba(255, 255, 255, 0);">Accelerator Physics Group Leader<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt;"><span style="background-color: rgba(255, 255, 255, 0);">Center for Advanced Studies of Accelerators<o:p></o:p></span></p>
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<span style="background-color: rgba(255, 255, 255, 0);">___________________________________</span>
<div>Sent from my iPhone</div>
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<blockquote type="cite">On Aug 23, 2022, at 10:40 AM, Brooks, Stephen via FFA_CEBAF_Collab <ffa_cebaf_collab@jlab.org> wrote:<br>
<br>
</blockquote>
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<blockquote type="cite">
<div dir="ltr"><span>100 cells per 180 degree FFA arc would be 200 magnets, and 200 correctors. So for all FFA sections in the facility (two 180 degree arcs), 400 permanent magnets and 400 correctors.</span><br>
<span></span><br>
<span>I think what Jay is saying makes sense too. Not sure where "50" came from.</span><br>
<span></span><br>
<span> -Stephen</span><br>
<span></span><br>
<span>________________________________________</span><br>
<span>From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces@jlab.org> on behalf of Jay Benesch via FFA_CEBAF_Collab <ffa_cebaf_collab@jlab.org></span><br>
<span>Sent: 22 August 2022 11:42</span><br>
<span>To: Chase Dubbe; Omar Garza; ffa_cebaf_collab@jlab.org</span><br>
<span>Cc: Joseph Meyers; Mike Bevins; Will Oren; Camille Ginsburg</span><br>
<span>Subject: Re: [FFA_CEBAF_Collab] FFA corrector concept</span><br>
<span></span><br>
<span>Chase,</span><br>
<span></span><br>
<span>If there are only 50 BD and 50 BF per arc, then 100 assemblies per arc. Since the length of the BD+BF cell is about 125 cm, the arc circumference is ~250 m and the packing fraction is about 90%, I rounded up to 100 cells. I remember 88 and 90 cells
per arc mentioned in weekly meetings. The splitters will need correctors as well and there are at least five cells in each of those. Since the splitters are individual lines by definition and there are six at each end of each arc in the present concept,
add 2*6*5 to the number needed, for 150 total per arc. Alex's MMV.</span><br>
<span></span><br>
<span>Jay</span><br>
<span></span><br>
<span>________________________________________</span><br>
<span>From: Chase Dubbe <cdubbe@jlab.org></span><br>
<span>Sent: Monday, August 22, 2022 11:15 AM</span><br>
<span>To: Omar Garza; Jay Benesch; ffa_cebaf_collab@jlab.org</span><br>
<span>Cc: Will Oren; Camille Ginsburg; Mike Bevins; Joseph Meyers; Alex Bogacz</span><br>
<span>Subject: Re: FFA corrector concept</span><br>
<span></span><br>
<span>Good Morning Omar,</span><br>
<span></span><br>
<span>To try to help, the FFA permanent magnets won't have a power requirement, but the Panofsky Quads that will be mounted along with them will. Based on the latest Magnet count sheet, there will be 50 of them per ARC (East/West) and reviewing Jay's technical
write up, they should need 900W per magnet. He did mention that each would require two power supplies.</span><br>
<span></span><br>
<span>With regards to the counts though, there is some discrepancy. Jay, for each of the ARCs, is the number 50 or 100? Looking at your paper, vs the magnet count sheet, you are specifying 100 per ARC vs. the 50. Also, do my assumptions on power and power supply
requirements line up with your specification?</span><br>
<span></span><br>
<span>[cid:e6d9ef9a-552c-471e-b389-b9c5801d6a03]</span><br>
<span>*Snap shot from Jay's paper 'FFA Corrector Concept'</span><br>
<span></span><br>
<span> Name L[cm] B[kG] G[kG/cm] Number of magnets</span><br>
<span> BD 50 3.1 4.7 200</span><br>
<span> BF 50 5.5 1.5 200</span><br>
<span>Panofsky window quad, per Jay's sprec 100</span><br>
<span>*Cells Taken from 'New Magnet and RF Inventory' Excel</span><br>
<span></span><br>
<span>Thanks,</span><br>
<span>Chase</span><br>
<span>________________________________</span><br>
<span>From: Omar Garza <garza@jlab.org></span><br>
<span>Sent: Monday, August 22, 2022 10:51 AM</span><br>
<span>To: Jay Benesch <benesch@jlab.org>; Chase Dubbe <cdubbe@jlab.org>; ffa_cebaf_collab@jlab.org <ffa_cebaf_collab@jlab.org></span><br>
<span>Cc: Will Oren <oren@jlab.org>; Camille Ginsburg <ginsburg@jlab.org>; Mike Bevins <mbevins@jlab.org>; Joseph Meyers <meyers@jlab.org>; Alex Bogacz <bogacz@jlab.org></span><br>
<span>Subject: Re: FFA corrector concept</span><br>
<span></span><br>
<span>Good morning everyone.</span><br>
<span>Does someone have the power requirements for the FFAs and new dipoles?</span><br>
<span>Thank you.</span><br>
<span>O'</span><br>
<span></span><br>
<span>Omar Garza</span><br>
<span>Deputy of Electrical Engineering Systems - Accelerator Reliability</span><br>
<span>Thomas Jefferson National Accelerator Facility</span><br>
<span>(757) 269-7257 garza@jlab.org<mailto:garza@jlab.org></span><br>
<span>________________________________</span><br>
<span>From: Jay Benesch <benesch@jlab.org></span><br>
<span>Sent: Monday, August 8, 2022 11:41 AM</span><br>
<span>To: Chase Dubbe <cdubbe@jlab.org>; ffa_cebaf_collab@jlab.org <ffa_cebaf_collab@jlab.org></span><br>
<span>Cc: Will Oren <oren@jlab.org>; Omar Garza <garza@jlab.org>; Camille Ginsburg <ginsburg@jlab.org>; Mike Bevins <mbevins@jlab.org>; Joseph Meyers <meyers@jlab.org>; Alex Bogacz <bogacz@jlab.org></span><br>
<span>Subject: Re: FFA corrector concept</span><br>
<span></span><br>
<span>Chase,</span><br>
<span></span><br>
<span>It is my understanding that each of the permanent magnets will require</span><br>
<span>one of these correctors. Only two of the three windings per assembly</span><br>
<span>will likely be powered. Hence the estimate of 400 units and 800 power</span><br>
<span>supplies. It seems to me better to build all the units with the three</span><br>
<span>windings and power only two, to simplify fabrication and assembly. And</span><br>
<span>we might need three in some locations. Rabbet joints assumed in the</span><br>
<span>steel to simplify assembly.</span><br>
<span></span><br>
<span>I'll send you the opc file for this under separate email.</span><br>
<span></span><br>
<span>Jay</span><br>
<span></span><br>
<span>On 8/8/22 11:27, Chase Dubbe wrote:</span><br>
<blockquote type="cite"><span>Good Morning Jay,</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>First, thank you for sharing all the other panofsky quad models. I have</span><br>
</blockquote>
<blockquote type="cite"><span>been out on vacation, so have not had a chance to look through them, but</span><br>
</blockquote>
<blockquote type="cite"><span>they are greatly appreciated.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>I am still trying to catch up, but for the cost estimate of these</span><br>
</blockquote>
<blockquote type="cite"><span>Picture Frame Correctors, is the intent to have one per each FODO set of</span><br>
</blockquote>
<blockquote type="cite"><span>permanent magnets in the FFA line, or will there be more or less? I just</span><br>
</blockquote>
<blockquote type="cite"><span>want to get a grasp at the quantity so that I can either use the cost</span><br>
</blockquote>
<blockquote type="cite"><span>estimate numbers Tommy Hiatt had developed, or perhaps go out for an RFI</span><br>
</blockquote>
<blockquote type="cite"><span>for cost.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Thanks again for the help,</span><br>
</blockquote>
<blockquote type="cite"><span>Chase Dubbe'</span><br>
</blockquote>
<blockquote type="cite"><span>------------------------------------------------------------------------</span><br>
</blockquote>
<blockquote type="cite"><span>*From:* Jay Benesch <benesch@jlab.org></span><br>
</blockquote>
<blockquote type="cite"><span>*Sent:* Monday, August 8, 2022 10:18 AM</span><br>
</blockquote>
<blockquote type="cite"><span>*To:* ffa_cebaf_collab@jlab.org <ffa_cebaf_collab@jlab.org></span><br>
</blockquote>
<blockquote type="cite"><span>*Cc:* Chase Dubbe <cdubbe@jlab.org>; Will Oren <oren@jlab.org>; Omar</span><br>
</blockquote>
<blockquote type="cite"><span>Garza <garza@jlab.org>; Camille Ginsburg <ginsburg@jlab.org></span><br>
</blockquote>
<blockquote type="cite"><span>*Subject:* FFA corrector concept</span><br>
</blockquote>
<blockquote type="cite"><span>Attached please find a "picture frame" corrector concept which satisfies</span><br>
</blockquote>
<blockquote type="cite"><span>the requirements Stephen provided Friday. It should suffice for the cost</span><br>
</blockquote>
<blockquote type="cite"><span>estimate. Comments welcome.</span><br>
</blockquote>
<span></span><br>
<span></span><br>
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