[FFA_CEBAF_Collab] [EXTERNAL] Re: FFA corrector concept

Tue Aug 23 10:59:43 EDT 2022

Hi Stephen,

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.
We will further tackle it on Friday…Feel free to lead the discussion…
Thanks.

Cheers,

Alex
___________________________________
S. Alex Bogacz,
Accelerator Physics Group Leader
Center for Advanced Studies of Accelerators
Jefferson Lab
12000 Jefferson Avenue,<x-apple-data-detectors://8>
Newport News, VA 23606<x-apple-data-detectors://8>
___________________________________
Sent from my iPhone

On Aug 23, 2022, at 10:40 AM, Brooks, Stephen via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org> wrote:

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.

I think what Jay is saying makes sense too.  Not sure where "50" came from.

   -Stephen

________________________________________
From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> on behalf of Jay Benesch via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Sent: 22 August 2022 11:42
To: Chase Dubbe; Omar Garza; ffa_cebaf_collab at jlab.org
Cc: Joseph Meyers; Mike Bevins; Will Oren; Camille Ginsburg
Subject: Re: [FFA_CEBAF_Collab] FFA corrector concept

Chase,

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.

Jay

________________________________________
From: Chase Dubbe <cdubbe at jlab.org>
Sent: Monday, August 22, 2022 11:15 AM
To: Omar Garza; Jay Benesch; ffa_cebaf_collab at jlab.org
Cc: Will Oren; Camille Ginsburg; Mike Bevins; Joseph Meyers; Alex Bogacz
Subject: Re: FFA corrector concept

Good Morning Omar,

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.

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?

[cid:e6d9ef9a-552c-471e-b389-b9c5801d6a03]
*Snap shot from Jay's paper 'FFA Corrector Concept'

       Name    L[cm]   B[kG]   G[kG/cm]        Number of magnets
       BD      50      3.1     4.7     200
       BF      50      5.5     1.5     200
Panofsky window quad, per Jay's sprec   100
*Cells Taken from 'New Magnet and RF Inventory' Excel

Thanks,
Chase
________________________________
From: Omar Garza <garza at jlab.org>
Sent: Monday, August 22, 2022 10:51 AM
To: Jay Benesch <benesch at jlab.org>; Chase Dubbe <cdubbe at jlab.org>; ffa_cebaf_collab at jlab.org <ffa_cebaf_collab at jlab.org>
Cc: Will Oren <oren at jlab.org>; Camille Ginsburg <ginsburg at jlab.org>; Mike Bevins <mbevins at jlab.org>; Joseph Meyers <meyers at jlab.org>; Alex Bogacz <bogacz at jlab.org>
Subject: Re: FFA corrector concept

Good morning everyone.
Does someone have the power requirements for the FFAs and new dipoles?
Thank you.
O'

Omar Garza
Deputy of Electrical Engineering Systems - Accelerator Reliability
Thomas Jefferson National Accelerator Facility
(757) 269-7257 garza at jlab.org<mailto:garza at jlab.org>
________________________________
From: Jay Benesch <benesch at jlab.org>
Sent: Monday, August 8, 2022 11:41 AM
To: Chase Dubbe <cdubbe at jlab.org>; ffa_cebaf_collab at jlab.org <ffa_cebaf_collab at jlab.org>
Cc: Will Oren <oren at jlab.org>; Omar Garza <garza at jlab.org>; Camille Ginsburg <ginsburg at jlab.org>; Mike Bevins <mbevins at jlab.org>; Joseph Meyers <meyers at jlab.org>; Alex Bogacz <bogacz at jlab.org>
Subject: Re: FFA corrector concept

Chase,

It is my understanding that each of the permanent magnets will require
one of these correctors.  Only two of the three windings per assembly
will likely be powered.  Hence the estimate of 400 units and 800 power
supplies.  It seems to me better to build all the units with the three
windings and power only two, to simplify fabrication and assembly.  And
we might need three in some locations. Rabbet joints assumed in the
steel to simplify assembly.

I'll send you the opc file for this under separate email.

Jay

On 8/8/22 11:27, Chase Dubbe wrote:
Good Morning Jay,

First, thank you for sharing all the other panofsky quad models. I have
been out on vacation, so have not had a chance to look through them, but
they are greatly appreciated.

I am still trying to catch up, but for the cost estimate of these
Picture Frame Correctors, is the intent to have one per each FODO set of
permanent magnets in the FFA line, or will there be more or less? I just
want to get a grasp at the quantity so that I can either use the cost
estimate numbers Tommy Hiatt had developed, or perhaps go out for an RFI
for cost.

Thanks again for the help,
Chase Dubbe'
------------------------------------------------------------------------
*From:* Jay Benesch <benesch at jlab.org>
*Sent:* Monday, August 8, 2022 10:18 AM
*To:* ffa_cebaf_collab at jlab.org <ffa_cebaf_collab at jlab.org>
*Cc:* Chase Dubbe <cdubbe at jlab.org>; Will Oren <oren at jlab.org>; Omar
Garza <garza at jlab.org>; Camille Ginsburg <ginsburg at jlab.org>
*Subject:* FFA corrector concept
Attached please find a "picture frame" corrector concept which satisfies
the requirements Stephen provided Friday. It should suffice for the cost
estimate. Comments welcome.

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