[FFA_CEBAF_Collab] [EXTERNAL] Re: Vertical orbit spread in FFA Branch

[Brooks, Stephen]

If I take those heights and assume the up/down parts to be equivalent to a triangular dog-leg of total length 14m, then the path length differences are +15.0mm for the lowest energy and +3.4mm for the highest energy.

I'm happy to see the path length changing because for example in the 2021 lattices, the total variation in a half-turn was ~100mm.  So just that bend and bend back has given 10% of what the entire splitter needs.

Also, in those FFA designs the higher energies tended to have longer path lengths, but in this bend section the higher energies have shorter path lengths.  So even the bend section is contributing in the right direction!

     -Stephen

________________________________________
From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> on behalf of Ryan Bodenstein via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Sent: 29 July 2022 15:43
To: ffa_cebaf_collab at jlab.org
Subject: [FFA_CEBAF_Collab] Vertical orbit spread in FFA Branch

Good evening colleagues,

As a quick follow up to our meeting, I’m sending out two plots in answer to questions of the spread of the orbits in the FFA branch of our spreader.

One is a plot of *all* elevations for the different passes in the NE spreader. Please recall, passes 1-7 are EM passes, and 9+ are all in the FFA branch.

The second plot is simply focusing on the FFA branch (passes 9-19). As expected, they scale like the dispersion. To simulation accuracy, the full width of the spread is 10032.372 - 10015.834 = 16.583 cm. So, it’ll be a big (rectangular?) beampipe, but I think that was expected by all of us.

Just wanted to send that out before everyone got off for the weekend. Speaking of which, have a wonderful one!

Cheers!
Ryan

Dr. Ryan Bodenstein (he/him)
Staff Scientist II – Center for Advanced Study of Accelerators (CASA)
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