[FFA_CEBAF_Collab] [EXTERNAL] Re: FFA at CEBAF WG mtg. this Friday, April 4

[Nick Sereno]

Hi Scott,

You said something interesting during the meeting I did not quite hear as the audio was going in and out at my end.

I think you said to Donish that to understand how to keep the twiss/dispersion parameters constant while trying to
set the R56 to what  one wants.  You described to consider the matrix equation:

Dx = b

where x is the vector of quad strengths, b is the vector of beta functions/dispersion and you want to find the linear combinations
of quad strengths that don't change the vector b.  I think you are searching for the null space of D (the matrix of derivatives) which
can be found using SVD of the matrix D assumed to not be of full rank.   Anyway, that was my interpretation of what I partially heard
you say but I think you used a different algorithm to obtain the null space.

Is this the correct interpretation of what you said?

Thanks,
Nick
________________________________
From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> on behalf of Brooks, Stephen via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Sent: Friday, April 4, 2025 12:09 PM
To: Alex Bogacz via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>; Ryan Bodenstein <ryanmb at jlab.org>
Subject: [FFA_CEBAF_Collab] [EXTERNAL] Re: FFA at CEBAF WG mtg. this Friday, April 4

Sorry I was in a project review for a different FFA(!)

     -Stephen

________________________________________
From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> on behalf of Ryan Bodenstein via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Sent: 04 April 2025 12:08
To: Alex Bogacz via FFA_CEBAF_Collab
Subject: Re: [FFA_CEBAF_Collab] FFA at CEBAF WG mtg. this Friday, April 4

Dear Colleagues,

Thanks for the good discussion!

Attached are the minutes.

Cheers!
Ryan

From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> on behalf of Alex Bogacz via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Date: Monday, March 31, 2025 at 5:54 PM
To: Alex Bogacz via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Subject: [FFA_CEBAF_Collab] FFA at CEBAF WG mtg. this Friday, April 4

Dear Colleagues,
We will continue our design efforts this Friday, April 4, at 11:00 am.

  *   Splitter design, update - Donish
  *   AOB - ALL
Please, follow a ZOOM invitation below.
Cheers,
Alex
 ___________________________________
S. Alex Bogacz,
Accelerator Physics Group Leader
Center for Advanced Studies of Accelerators
Jefferson Lab

ZOOM connection:

The link is here: https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1614898082-3Fpwd-3DTnUzMS81M2sxbDZIbERJU01tYkJCQT09&d=DwIGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Ogg4WFNBwvADBq3fkmCLiJ7SaRDPYtawHzJElJMB0jE&m=te-lLg-vSoDwMBjseLUaw3xcu5jYz_Ny2M_wPF-XRVjsU8ew333N0xZUJYc3Tyxf&s=YoiFqr2WlLAR-C_sjdSO0tKTuWhfq-X7S3CyO19BDuc&e= <https://urldefense.com/v3/__https://jlab-org.zoomgov.com/j/1614898082?pwd=TnUzMS81M2sxbDZIbERJU01tYkJCQT09__;!!P4SdNyxKAPE!Gg4oWbBxGQSSg8iwfieUq9U3j7MLZUDVF3-z6-GshsiVO1GzyT-yu_oHm98C03qrmvDK_S9hywyxdaOgEjjrXV0hnro$ >

In case of problems, the zoom room is below:
Meeting ID: 161 489 8082
Passcode: 123456
________________________



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