[FFA_CEBAF_Collab] [EXTERNAL] Re: FFA at CEBAF WG mtg. this Friday, March 15

[Brooks, Stephen]

The design accepts 9-21GeV, so if the beam enters at 9GeV after 5 full turns, then after another 5 full turns it would be at 18GeV minus any synchrotron radiation loss, so 17.5GeV or something like that.  You wouldn't run into the FFA upper limit when operating the linacs at only 900MeV, you'd just get less energy overall.

To get 22GeV after 10 full turns you'd need about 1150MeV per linac.  The range between these two settings covers the full "energy adjustability" range ~2.2GeV between the final two turns, meaning you can get a continuous range of energies by combining selecting which turn to extract with varying the linac energy.

     -Stephen

________________________________________
From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> on behalf of Roger Ruber via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Sent: 15 March 2024 13:28
To: ffa_cebaf_collab at jlab.org
Subject: Re: [FFA_CEBAF_Collab] FFA at CEBAF WG mtg. this Friday, March 15

Hi,

Apologies I couldn't join today and missed this interesting discussion.

I see from the conclusions that the sextupole magnets would help to
lower the energy acceptance to 9 GeV. That would be 0.9 GeV/linac
and give and overhead of >200 MeV or 2 C100 cryomodules/linac.
That would be really a good solution.

How does it affect the upper energy acceptance?

Best regards,
Roger.

-----Original Message-----
From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> On Behalf Of Ryan Bodenstein via FFA_CEBAF_Collab
Sent: Friday, 15 March, 2024 12:03
To: Alex Bogacz via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Cc: Tim Michalski <michalsk at jlab.org>; Nick Sereno <nsereno at jlab.org>; Salim Ogur <salim.ogur at cern.ch>; Planche Thomas <tplanche at triumf.ca>
Subject: Re: [FFA_CEBAF_Collab] FFA at CEBAF WG mtg. this Friday, March 15

Dear Colleagues,

Thanks for the updates this week. Attached (and uploaded), you'll find our minutes.

Everyone have a great weekend!

Cheers!
Ryan


Dr. Ryan Bodenstein (he/him)

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



12000 Jefferson Avenue

Newport News, VA 23606

United States of America

________________________________

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>
Sent: Monday, March 11, 2024 11:01 PM
To: Alex Bogacz via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Cc: Tim Michalski <michalsk at jlab.org>; Planche Thomas <tplanche at triumf.ca>; Salim Ogur <salim.ogur at cern.ch>
Subject: [FFA_CEBAF_Collab] FFA at CEBAF WG mtg. this Friday, March 15





Dear Colleagues,




We will continue our design efforts this Friday, March 15, at 11:00 am.

*       Permanent magnets with a sextupole, energy acceptance  - Stephen, Dejan
*       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

12000 Jefferson Avenue,





ZOOM connection:

The link is here: https://urldefense.com/v3/__https://jlab-org.zoomgov.com/j/1614898082?pwd=TnUzMS81M2sxbDZIbERJU01tYkJCQT09__;!!P4SdNyxKAPE!AcpwSnCPikr_D_8MO9mIn7cqIkDms6zOg-wZGJNp7atIoh_j1JwnxPv3anxqkYBPeNObKuhjCm8diyImAupOz30FeT0$

In case of problems, the zoom room is below:

Meeting ID: 161 489 8082

Passcode: 123456

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