[FFA_CEBAF_Collab] [EXTERNAL] Re: FFA at CEBAF WG mtg. this Friday, May 30

Brooks, Stephen sbrooks at bnl.gov
Fri May 30 13:19:38 EDT 2025


Yes, I thought maybe we could overall shorten the cell and that would naturally decrease the energy range, even the overall radius of curvature and magnet cross-sections and fields could be the same.  The betas would scale down with lengths.  Tunes would be the same.

I think it's basically to get 1/2 energy you multiply all lengths (and bend angles) by 1/sqrt(2).  11-22GeV would become 5.5-11GeV.

Scott, I can go through what the "baseline" FODO lattice I provided way back in Dec 2022 is, the following file shows one arc element-by-element.

https://urldefense.proofpoint.com/v2/url?u=https-3A__jeffersonlab-2Dmy.sharepoint.com_-3At-3A_r_personal_tristan-5Fjlab-5Forg_Documents_Grad-2520Student-25202019_Graduate-2520Student-2520Steering_CEBAF-2520FFA-2520Working-2520Group_Optics_FFA-2520Arcs_Brooks-5F20221216_Muon1_listcomponents-5FCEBAF-5FDec-252722-5Feast-5FMatchBentTrue.txt-3Fcsf-3D1-26web-3D1-26e-3DaxqOuR&d=DwIGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Ogg4WFNBwvADBq3fkmCLiJ7SaRDPYtawHzJElJMB0jE&m=PopKNslxSMCtM51-QDazXpIquCL-gDw1DUDZucbo6gUuKWInMm7nJOYM25nmzd7i&s=nNKP_OKUMkAWZcQFVzq5iYBa1SeReueIA_sfmz03HPM&e= 

     -Stephen

________________________________________
From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> on behalf of Berg, J Scott via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Sent: 30 May 2025 12:36
To: Alex Bogacz via FFA_CEBAF_Collab
Subject: [FFA_CEBAF_Collab] [EXTERNAL] Re:  FFA at CEBAF WG mtg. this Friday, May 30

A couple more thoughts on the discussion we had:

  *
What about putting the cell on a mover that lets us change x-z, to help with setting up different initial conditions?
  *
I'm mildly concerned with a design where we can only probe one side of the aperture, and close to the limit. There seems to be a lot of risk there (beam is not in the mood to reach the energy, magnets come in with a lower Br than expected, etc.). How about a design where we don't quite imitate our cell, but maybe use the same magnet cross sections, but remove one or two slices from each magnet? We could even see if we could have two options, one where we remove the end slices, and one where we have all the slices. I'm being sloppy on details here, so maybe it's not as straightforward as I'm imagining, but it seems something like this could be made to work.

-Scott


________________________________
From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> on behalf of Donish Khan via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Sent: Friday, May 30, 2025 12:17
To: Alex Bogacz <bogacz at jlab.org>
Cc: Alex Bogacz via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>; Sadiq Saitiniyazi <saitiniy at jlab.org>
Subject: Re: [FFA_CEBAF_Collab] FFA at CEBAF WG mtg. this Friday, May 30

Hi All,

Great discussion today. Attached are the meeting notes (FFA_at_CEBAF_Minutes_20250530.pdf<https://urldefense.com/v3/__https://jeffersonlab-my.sharepoint.com/:b:/r/personal/tristan_jlab_org/Documents/Grad*20Student*202019/Graduate*20Student*20Steering/CEBAF*20FFA*20Working*20Group/Minutes/FFA_at_CEBAF_Minutes_20250530.pdf?csf=1&web=1&e=5tBLcc__;JSUlJSUlJQ!!P4SdNyxKAPE!Hth8QVRfyn3UHMdYpmsUIuQaHu7wl7enJtqrepyyyPNres8ltwkhDBquAHIBTrSS8cL07zX9yEwDBFKmHyDGs-zE5g$ >).

Have a great weekend,
Donish






On May 27, 2025, at 3:08 PM, Alex Bogacz via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org> wrote:


Dear Colleagues,

We will continue our design efforts this Friday, May 30, at 11:00 am.

  *   Gearing up for FFA beam transport test - Salim
  *   Splitter design, magnet error tolerances  - 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=PopKNslxSMCtM51-QDazXpIquCL-gDw1DUDZucbo6gUuKWInMm7nJOYM25nmzd7i&s=Tf_NdqNNR5CyIz3pJDW6plxtGG31LmavXr7YNfaAX38&e= <https://urldefense.com/v3/__https://jlab-org.zoomgov.com/j/1614898082?pwd=TnUzMS81M2sxbDZIbERJU01tYkJCQT09__;!!P4SdNyxKAPE!Hth8QVRfyn3UHMdYpmsUIuQaHu7wl7enJtqrepyyyPNres8ltwkhDBquAHIBTrSS8cL07zX9yEwDBFKmHyB_wsNsYg$ >

In case of problems, the zoom room is below:

Meeting ID: 161 489 8082

Passcode: 123456

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