[FFA_CEBAF_Collab] [EXTERNAL] RE: Two-aperture magnet

[Berg, J Scott]

Hi Stephen,

I'd expect the solution to be symmetric; does it get worse if you try to enforce symmetry?

-Scott

> -----Original Message-----
> From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> On Behalf Of
> Brooks, Stephen via FFA_CEBAF_Collab
> Sent: Friday, March 18, 2022 3:38 PM
> To: ffa_cebaf_collab at jlab.org
> Subject: [FFA_CEBAF_Collab] [EXTERNAL] Two-aperture magnet
> 
> I can find some sort of solution for a two-aperture magnet for both
> electrons and positrons.
> 
> It only takes 1.81x the material of two separate magnets, so it's not
> quite as bad as having four FFAs instead of two.
> 
> There's a 6mm wide gap in the middle for mechanical supports for the
> vacuum chamber.  It sounds like we'd share the chamber between electrons
> and positrons, which might save some money BUT the vacuum chamber will
> collapse if we make it wider.  So, there is now room to put metal tabs in
> the middle on the top and bottom of the chamber, with threaded holes, so
> you support it with a bolts through to the top and bottom of the magnet.
> 
>      -Stephen