[FFA_CEBAF_Collab] [EXTERNAL] 9-21GeV lattice cell with sextupole

[Brooks, Stephen]

I put a lattice cell containing sextupole on the shared area here:

"Sextupole_20240111"

https://urldefense.proofpoint.com/v2/url?u=https-3A__jeffersonlab-2Dmy.sharepoint.com_personal_tristan-5Fjlab-5Forg_-5Flayouts_15_onedrive.aspx-3FisAscending-3Dtrue-26ga-3D1-26id-3D-252Fpersonal-252Ftristan-255Fjlab-255Forg-252FDocuments-252FGrad-2520Student-25202019-252FGraduate-2520Student-2520Steering-252FCEBAF-2520FFA-2520Working-2520Group-252FOptics-252FFFA-2520Arcs-252FSextupole-255F20240111-26sortField-3DLinkFilename&d=DwIFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=Ogg4WFNBwvADBq3fkmCLiJ7SaRDPYtawHzJElJMB0jE&m=VsW-ppjXIE_p2iMM1dVoRSCbwjRwFvmSAybc2G1is0GORjfiPaqMPXiwY8k5T8Dv&s=GQrODP1Sm9eWy84zWaK_4OduOEr0QLwwrcpvPPD9C8s&e= 

It spans 9-21GeV energies, so should be fine down to a minimum linac voltage of 930MeV and tuning upwards to 1040MeV (with 6 passes) covers the range up to 22GeV output to halls A,B,C.  It is also compatible with 5-pass although you'd have to use linac energies up to 1210MeV to get 22GeV out of it that way.

The magnets are actually 44% smaller in volume than our current baseline Dec'22!

Now the bad news: I have no idea what the dynamic aperture of this is like.

Also, the tunes are interesting (see opticsmatch...csv) , some are quite close together, which may not be ideal for correction schemes.

Eventually, we might use a smaller sextupole (slightly larger magnets, but better DA and better separated tunes).  But this one might be informative to explore for now.

     -Stephen