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The beamline and model is defined in the XAL beamline defintion file that Paul is maintaining:
http://www.slac.stanford.edu/cgi-wrap/cvsweb/ The production model is in:

/u1/lcls/physics/config/model/

This is the lcls.xdxf?rev=1.1&content-type=text/x-cvsweb-markup&cvsroot=LCLS
The default "accelerator" is loaded at startup. If you want to load a test model, Use Accelerator->Load Accelerator...

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To create a knob, just do the following:

1. Optionally, create a group Group.
2. Create a knob Knob
3. Add devices:
   1. Do this "by hand" if you know the PV. Eg YCOR:IN20:492:BDES
   2. Do this by "drilldown" (which uses physics name). In the Editor:
      1. Select a model sequence: Eg BXG TO BX01. Note that sequences are in alphabetical order. That is on the fix list.
      2. Select a device "type". Note that the type names given are:
         1) SNS type names, which themselves use >1 name eg hcorr == dch == horrzcorr => X correctors.
         2) and also flattened hierarchy of types, eg type "dipole" includes hcorr and vcorr.
      3. Select a device name, by "physics name".
      4. Select FieldSet (not FieldRB). (issue: FieldRB should not be offered).
   3. Or calculate bump knobs
      1. Select a section of contiguous sequence of sections (a "combo sequence") Accelerator->Sequences
         BXG TO BX01 - BX01 to BX02 works.
      2. Knobs->(Make Horizontal Bumps | Make vertical bumps) Make Horizontal Bumps (Make Vertical Doesn't work, since it seems so many of our correctors are SLC!)
      3. For Horizontal Bumps: These setups were tested.
         1. Design Offset 3 (default) magnets - works (4 magnet doesn't work!)
         2. Design Angle 5 (default) magnets - works
         3. Live Offset 3 - works
         4. Live Angle 5 works - works
      4. For Vertical Bumps, select sections BXG to BX01 - QM15 to FV2
         1. Design Offset 3 (default) magnets - works, but they're mostly SLC magnets, so you can't connect and can't set them.

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