diff --git a/appletree/parameters/nestv2.json b/appletree/parameters/nestv2.json
index 1fa52a8..7715656 100644
--- a/appletree/parameters/nestv2.json
+++ b/appletree/parameters/nestv2.json
@@ -10,6 +10,17 @@
         "unit": "g/cm^3",
         "doc": "Density of the lXe"
     },
+    "field": {
+        "prior_type": "fixed",
+        "prior_args": {
+            "val": 23.0
+        },
+        "allowed_range": null,
+        "init_mean": null,
+        "init_std": null,
+        "unit": "V/cm",
+        "doc": "Drift field"
+    },
     "alpha": {
         "prior_type": "twohalfnorm",
         "prior_args": {
diff --git a/appletree/parameters/nestv2_yield_only.json b/appletree/parameters/nestv2_yield_only.json
index c8b6d42..7acec60 100644
--- a/appletree/parameters/nestv2_yield_only.json
+++ b/appletree/parameters/nestv2_yield_only.json
@@ -10,6 +10,17 @@
         "unit": "g/cm^3",
         "doc": "Density of the lXe"
     },
+    "field": {
+        "prior_type": "fixed",
+        "prior_args": {
+            "val": 23.0
+        },
+        "allowed_range": null,
+        "init_mean": null,
+        "init_std": null,
+        "unit": "V/cm",
+        "doc": "Drift field"
+    },
     "alpha": {
         "prior_type": "twohalfnorm",
         "prior_args": {
diff --git a/appletree/plugins/detector.py b/appletree/plugins/detector.py
index 2f04438..3f3767a 100644
--- a/appletree/plugins/detector.py
+++ b/appletree/plugins/detector.py
@@ -71,7 +71,7 @@ class EField(Plugin):
     def simulate(self, key, parameters, x, y, z):
         # Safe to use "if" because we expect config to be fixed
         if not self.efield_position_dependence.value:
-            return key, parameters["field"]
+            return key, jnp.ones(x.shape) * parameters["field"]
         r = jnp.sqrt(x**2 + y**2)
         pos_true = jnp.stack([r, z]).T
         return key, self.efield_map.apply(pos_true)