Bugfix : WakePotential

Remove part which was causing "damping".
We have to re-process the wake function at each track call and not to reuse the previously processed wake function

tracking/wakepotential.py

@@ -196,15 +196,10 @@ class WakePotential(Element):
             Wake function array in [V/C] or [V/C/m].
 
         """
-        
-        try:
-            tau0 = getattr(self, "tau0_" + wake_type)
-            dtau0 = getattr(self, "dtau0_" + wake_type)
-            W0 = getattr(self, "W0_" + wake_type)
-        except AttributeError:
-            tau0 = np.array(getattr(self.wakefield, wake_type).data.index)
-            dtau0 = tau0[1] - tau0[0]
-            W0 = np.array(getattr(self.wakefield, wake_type).data["real"])
+
+        tau0 = np.array(getattr(self.wakefield, wake_type).data.index)
+        dtau0 = tau0[1] - tau0[0]
+        W0 = np.array(getattr(self.wakefield, wake_type).data["real"])
         
         # Keep only the wake function on the rho window
         ind = np.all([min(tau[0], 0) < tau0, max(tau[-1], 0) > tau0],