Lens4escan

[vespos]

Description

Make lens stack class usable for energy scans with the CCM

Motivation and Context

This includes:

• Energy functionality based on either user input, mono energy or LCLS energy.
• Utility function to get the current setup.
• Report status on move. Needed for scans
• Allow for either the pulse-picker or attenuator to be used for blocking the beam. Pulse-picker is fast to insert/remove so there is some time to be gained there. Kinda messy, but it works
• Fix the lens_set vs lens path argument. Do that better?

How Has This Been Tested?

Where Has This Been Documented?

Pre-merge checklist

• Code works interactively
• Code contains descriptive docstrings, including context and API
• New/changed functions and methods are covered in the test suite where possible
• Test suite passes locally
• Test suite passes on GitHub Actions
• Ran docs/pre-release-notes.sh and created a pre-release documentation page
• Pre-release docs include context, functional descriptions, and contributors as appropriate

DO NOT FORGET TO REMOVE https://github.com/pcdshub/pcdsdevices/pull/1202/files#diff-5a91e8b8e2d4fabd6201376dd1c45357ec3ccf379d64d91641b430e7cad6b84aR222 BEFORE MERGE

[vespos]

DO NOT FORGET TO REMOVE BEFORE MERGE

[vespos]

Note to self: to check again

[tangkong]

Are we looking to merge this in addition to #1194 ? It seems like there's some duplicated work here

[vespos]

Yes, I expect #1194 to be merged first. This is sort of the next step and will likely take a bit more time.
In the meantime I need that other PR code in here for now. I expect git to take care of making this nice once the other PR is merged and I merge master back into this one.