eic
Setup new far backwards geometry
Briefly, what does this PR introduce?
Makes the changes required to match the current EIC accelerator beamline setup in the Far Backward region. The vacuum pipe spanning the tagger drift volume has needed some significant revisions, simplifying the implementation but removing some functionality to allow the "antechamber" design.
Incorporates the volumes reviewed in https://github.com/eic/epic/pull/978, placed correctly.
Introduces a new script which automatically updates the xml description of the magnets, strengths and positions based on a provided twiss and survey file. (The current files have been added to the calibrations but could be removed as don't do anything other than act as an input to the script.)
Some extra tinkering of positions may be required. In particular the luminosity pipe along the z-axis doesn't extend into the B2AeR magnet. There is a small vacuum/air boundary between the tagger exit windows and the beampipe cylinder. These could be fixed in this PR or a future PR as they won't have the most significant impacts.
The Luminosity components will need their positions updated to match the new layout.
Not the cleanest PR.
What kind of change does this PR introduce?
- [x] Bug fix (issue #963)
- [ ] New feature (issue #__)
- [ ] Documentation update
- [ ] Other: __
Please check if this PR fulfills the following:
- [ ] Tests for the changes have been added
- [ ] Documentation has been added / updated
- [ ] Changes have been communicated to collaborators
Does this PR introduce breaking changes? What changes might users need to make to their code?
Hopefully nothing.
Does this PR change default behavior?
There is likely to be significant changes to the acceptance and reconstruction of the taggers.
Visual comparison between the CAD and simulation. Looks like definitely some positions to adjust still.