Many fixes!

pyproject.toml

@@ -15,7 +15,7 @@ requires-python = ">=3.9"
 license = { file = "LICENSE" }
 dependencies = [
     "h_transport_materials~=0.17",
-    "festim@git+https://github.com/festim-dev/FESTIM@effcbac86ba0620da1388dcee4e8424ce33939db"]
+    "festim@git+https://github.com/kaelyndunnell/FESTIM@d1b71deed2d0998159b99591951493bffa1f5ca8"]
 
 classifiers = [
     "Natural Language :: English",

src/hisp/bin.py

@@ -5,6 +5,7 @@
 
 class SubBin:
     thickness: float
+    copper_thickness: float
     material: str
     mode: str
     dfw: bool
@@ -31,6 +32,7 @@ def __init__(
 
         Attributes:
             thickness: The thickness of the subbin (in m).
+            copper_thickness: The thickness of the copper layer behind W bins (m).
             material: The material of the subbin.
             mode: The mode of the subbin (shadowed, wetted, low_wetted, high_wetted).
             dfw: A boolean indicating if the subbin is a Divertor First Wall (DFW) subbin.
@@ -45,6 +47,7 @@ def __init__(
         self.material = material
         self.mode = mode
         self.dfw = False
+        self.copper_thickness = None
         self.parent_bin_index = None
         self.low_wetted_area = None
         self.high_wetted_area = None