Mag dipole sources, defined using prim-sec with a zero-frequency primary actually have a non-zer S_e component if there is variable mu. This has been corrected in the vector potential definition of the sources, and an issue created for the remaining sources. Testing has also been made more robust by using a rawVec source with both S_m and S_e defined which showed a couple bugs in some of the getRHSDeriv_m (which have been corrected), along with a couple minor sizing things in fields derivs

simpegEM/FDEM/FDEM.py

@@ -19,7 +19,7 @@ class BaseFDEMProblem(BaseEMProblem):
     surveyPair = SurveyFDEM
     fieldsPair = FieldsFDEM
 
-    def fields(self, m):
+    def fields(self, m=None):
         self.curModel = m
         F = self.fieldsPair(self.mesh, self.survey)
 
@@ -151,10 +151,6 @@ class BaseFDEMProblem(BaseEMProblem):
 
         return S_m, S_e
 
-    def getSourceTermDeriv(self,freq,m,v,u=None,adjoint=False):
-        raise NotImplementedError('getSourceTermDeriv not implemented yet')
-        return None, None
-
 
 ##########################################################################################
 ################################ E-B Formulation #########################################
@@ -321,14 +317,14 @@ class ProblemFDEM_b(BaseFDEMProblem):
 
     def getRHSDeriv_m(self, src, v, adjoint=False):
         C = self.mesh.edgeCurl
-        S_m, S_e = self.getSourceTerm(src.freq)
+        S_m, S_e = src.eval(self)
         MfMui = self.MfMui
 
         if self._makeASymmetric and adjoint:
             v = self.MfMui * v
 
         if S_e is not None:
-            MeSigmaIDeriv = self.MeSigmaIDeriv(S_e)
+            MeSigmaIDeriv = self.MeSigmaIDeriv(Utils.mkvc(S_e))
             if not adjoint:
                 RHSderiv = C * (MeSigmaIDeriv * v)
             elif adjoint:
@@ -577,7 +573,7 @@ class ProblemFDEM_h(BaseFDEMProblem):
         return RHS
 
     def getRHSDeriv_m(self, src, v, adjoint=False):
-        _, S_e = self.getSourceTerm(src.freq)
+        _, S_e = src.eval(self)
         C = self.mesh.edgeCurl
         MfRho  = self.MfRho
         MfRhoDeriv = self.MfRhoDeriv(S_e)