[Bteam] injector relative orbit and zero pos

[Michele Joyce]

FYI, the Injector Autosteer has a feature to use a "gold" orbit saved by 
the Injector experts...as opposed to the relative orbit.
Michele

On 4/19/2011 8:05 AM, Jay Benesch wrote:
> Assertions
>
> 1. with two high current halls the orbit is the weighted average of the
> beam centroids
>
> 2. Qweak charge asymmetry is related, for reasons unknown, to the amount
> of beam scraped off on A2
>
> 3. When Ops does a save with zero position it saves the relative orbit
> for all BPMs
>
> 4. Injector autosteer relies on the relative orbit
>
>
> Conjecture
>
> 0R04 trips may be related to the relative orbits of the A and C beams.
> http://opweb.acc.jlab.org/CSUEApps/elog02/elog_item.php?elog_id=1579572
>
>
> Suggestions
>
> "Zero position" option in SAVER should be modified from yes/no choice to
> three choices:
>
> a. zero position for injector "[0123]I", 0L, 0R
> b. zero position for everything else
> c. no ZP
>
> Ops could choose any one or the a/b pair.
>
> For restore, there could be a few more templates at the end under a BPM
> restore "menu": injector, machine, hall A, hall B, hall C.  Or people
> could simply be required to continue to grep the needed BPMs when
> restoring a relative orbit.
>
> Jay
>
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