[FFA_CEBAF_Collab] [EXTERNAL] Re: FFA at CEBAF WG mtg. this Friday, November 1

[Berg, J Scott]

I think reducing the R56 range is generally a big win, large R56 correction is usually difficult and often requires very strong focusing. ToF probably doesn’t matter so much, you’ll likely find that you’re inserting extra wavelengths in some of your lines anyhow. PMs in the splitter lines can be good if it helps manage space. You still need enough flexibility in electromagnetic quadrupoles to make your matches. You have to watch out with quadrupoles to ensure that it doesn’t ultimately limit your ability to make certain changes in your matching.

-Scott

From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> On Behalf Of Ryan Bodenstein via FFA_CEBAF_Collab
Sent: Friday, November 1, 2024 2:00 PM
To: Brooks, Stephen <sbrooks at bnl.gov>
Cc: ffa_cebaf_collab at jlab.org
Subject: Re: [FFA_CEBAF_Collab] [EXTERNAL] Re: FFA at CEBAF WG mtg. this Friday, November 1

Thanks Stephen!
I certainly think looking at your Option B would help reduce the burden on the splitters without adding nonlinear magnets. If it also helps the match conditions, all the better!
Cheers!
Ryan
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On Nov 1, 2024, at 1:54 PM, "Brooks, Stephen" <sbrooks at bnl.gov<mailto:sbrooks at bnl.gov>> wrote:

I wonder what would happen if you allowed permanent magnets in the splitter lines.  For example the sort of FDFDF "complex bend" Dejan was showing a picture of could allow bending without the dispersion getting too high.

The thing I think might be hard to solve that way is R56 (TOF is OK overall because separate lines).

I should mention I had an alternative lattice "B" in my IPAC24 paper that reduced the TOF and R56 by over a factor of two from the baseline, even with linear magnets, by using a slightly shorter cell.  One of the nonlinear field solutions does even better even with a long cell.  We could try and optimise a cell with the smallest TOF variation if that would help in the splitters.

     -Stephen

________________________________

From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org<mailto:ffa_cebaf_collab-bounces at jlab.org>> on behalf of Ryan Bodenstein via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org<mailto:ffa_cebaf_collab at jlab.org>>
Sent: 01 November 2024 12:21
To: Alex Bogacz via FFA_CEBAF_Collab
Subject: Re: [FFA_CEBAF_Collab] FFA at CEBAF WG mtg. this Friday, November 1

Good afternoon, Colleagues!

Attached, you'll find our minutes (as well as uploaded).

You all have a great weekend!
Ryan



Dr. Ryan Bodenstein (he/him)

Staff Scientist II – Center for Advanced Studies of Accelerators (CASA)

[signature_2397784822]

12000 Jefferson Avenue

Newport News, VA 23606

United States of America

________________________________

From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org<mailto:ffa_cebaf_collab-bounces at jlab.org>> on behalf of Alex Bogacz via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org<mailto:ffa_cebaf_collab at jlab.org>>
Sent: Monday, October 28, 2024 5:38 PM
To: Alex Bogacz via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org<mailto:ffa_cebaf_collab at jlab.org>>
Subject: [FFA_CEBAF_Collab] FFA at CEBAF WG mtg. this Friday, November 1



Dear Colleagues,

We will continue our design efforts this Friday, November 1, at 11:00 am.

  *   Emittance budget update - Kirsten
  *   ‘White Paper’ on 22 GeV CEBAF - ALL
  *   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:

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In case of problems, the zoom room is below:

Meeting ID: 161 489 8082

Passcode: 123456

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