diff --git a/sims/run/generate_configs.py b/sims/run/generate_configs.py
index b55c332..75f0eee 100644
--- a/sims/run/generate_configs.py
+++ b/sims/run/generate_configs.py
@@ -44,7 +44,8 @@ def get_defaults():
                 cry_width=102,
                 cry_depth=54,
                 N=1,
-                acceptance_angle=0.05651551,
+                # will be set when buliding end station
+                acceptance_angle=0,
                 thickness=1,
             ),
             "scan": SimScanConfig(start=min_tth, stop=max_tth, delta=1e-4),
@@ -71,7 +72,7 @@ def convert_cycler(cycle: Cycler) -> list[CompleteConfig]:
 
 
 if __name__ == "__main__":
-    cycle = cycler("source.E_hwhm", np.array([.1, 1, 2, 5]) * 1.4e-4)
+    cycle = cycler("source.E_hwhm", np.array([0.1, 1, 2, 5]) * 1.4e-4)
     configs = convert_cycler(cycle)
     config_path = Path("configs")
     config_path.mkdir(exist_ok=True)
diff --git a/src/bad_tools/xrt/endstation.py b/src/bad_tools/xrt/endstation.py
index f03815f..480c875 100644
--- a/src/bad_tools/xrt/endstation.py
+++ b/src/bad_tools/xrt/endstation.py
@@ -1,5 +1,5 @@
 import functools
-from dataclasses import dataclass
+from dataclasses import dataclass, replace
 from typing import Self
 
 import numpy as np
@@ -31,8 +31,9 @@ def from_configs(
         sim: SimConfig,
     ) -> Self:
         crystalSi01 = rmats.CrystalSi(t=analyzer.thickness)
-
         theta_b = _bragg(crystalSi01, source.E_incident)
+        analyzer = replace(analyzer, acceptance_angle=np.rad2deg(theta_b))
+
         arm_tth = np.deg2rad(15)
         beamLine = raycing.BeamLine()