Corretly convert hgap in dipole from bmad

desy-ml · Sep 26, 2024 · 2a0e662 · 2a0e662
1 parent 3038c7b
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -21,6 +21,7 @@
 - Add `TransverseDeflectingCavity` element (following the Bmad-X implementation) (see #240) (@jp-ga)
 - `Dipole` and `RBend` now take a focusing moment `k1` (see #235, #247) (@hespe)
 - Implement a converter for lattice files imported from Elegant (see #222) (@hespe)
+- Implement a converter to read bmad lattices (see #196, #261)
 
 ### 🐛 Bug fixes
 

diff --git a/cheetah/converters/bmad.py b/cheetah/converters/bmad.py
@@ -145,7 +145,7 @@ def convert_element(
             )
             return cheetah.Dipole(
                 length=torch.tensor([bmad_parsed["l"]]),
-                gap=torch.tensor([bmad_parsed.get("hgap", 0.0)]),
+                gap=torch.tensor([2 * bmad_parsed.get("hgap", 0.0)]),
                 angle=torch.tensor([bmad_parsed.get("angle", 0.0)]),
                 e1=torch.tensor([bmad_parsed["e1"]]),
                 e2=torch.tensor([bmad_parsed.get("e2", 0.0)]),