Complete mesh generation parameters for flex cables

Chris Smartt
1 parent 8c230103
Showing 13 changed files with 1405 additions and 102 deletions Show diff stats
DOCUMENTATION/THEORY_MANUAL/Tex/cable_types.tex
DOCUMENTATION/THEORY_MANUAL/Tex/preamble.tex
DOCUMENTATION/USER_GUIDE/Imgs/ML_flex_cable.eps
DOCUMENTATION/USER_GUIDE/Imgs/ML_flex_cable.obj
DOCUMENTATION/USER_GUIDE/Tex/creating_a_cable_bundle_model.tex
DOCUMENTATION/USER_GUIDE/Tex/creating_a_cable_model.tex
DOCUMENTATION/USER_GUIDE/Tex/introduction.tex
DOCUMENTATION/USER_GUIDE/Tex/preamble.tex
SRC/GENERAL_MODULES/constants.F90
SRC/PUL_PARAMETER_CALCULATION/CG_solve.F90
SRC/PUL_PARAMETER_CALCULATION/Laplace.F90
SRC/cable_bundle_model_builder.F90
SRC/cable_model_builder.F90
@@ -480,7 +480,7 @@ I_0 \\
 \begin{figure}[h]
 \centering
-\includegraphics[scale=0.5]{../USER_GUIDE/Imgs/flex_cable.eps}
+\includegraphics[scale=0.5]{../USER_GUIDE/Imgs/ML_flex_cable.eps}
 \caption{flex cable}
 \label{fig:flex_cable}
 \end{figure}
@@ -566,12 +566,12 @@ V_{d2\_c1} \\
 V_{ref}\\
 \end{array} \right)
 =\left[ \begin{array}{cccccc}
-  1     &     0   & \cdots &     0   &&  -1       0    \\
-  0     &     1   & \cdots &     0   &&  -1       0    \\
- \vdots & \vdots  & \ddots & \vdots  && \vdots\vdots   \\
-  0     &     0   & \cdots &     1   &&  -1       0    \\
-  0     &     0   & \cdots &     0   &&   1      -1    \\
-  0     &     0   & \cdots &     0   &&   0       1    \\
+  1     &     0   & \cdots &     0   &  -1    &    0    \\
+  0     &     1   & \cdots &     0   &  -1    &    0    \\
+ \vdots & \vdots  & \ddots & \vdots  & \vdots & \vdots   \\
+  0     &     0   & \cdots &     1   &  -1    &    0    \\
+  0     &     0   & \cdots &     0   &   1    &   -1    \\
+  0     &     0   & \cdots &     0   &   0    &    1    \\
 \end{array} \right]
 \left( \begin{array}{c}
 V_1    \\
@@ -597,7 +597,7 @@ I_{ref}\\
 =\left[ \begin{array}{cccccc}
   1     &     0   & \cdots &     0   &   0    &   0    \\
   0     &     1   & \cdots &     0   &   0    &   0    \\
- \vdots & \vdots  & \ddots & \vdots  & \vdots\vdots   \
+ \vdots & \vdots  & \ddots & \vdots  & \vdots & \vdots   \
   0     &     0   & \cdots &     1   &   0    &   0    \\
   0     &     0   & \cdots &     0   &   1    &   0    \\
   1     &     1   & \cdots &     1   &   1    &   1    \\
@@ -4,7 +4,7 @@
 \newcommand{\DocumentTitle}{Theory Manual}
 \newcommand{\DocumentSubTitle}{SACAMOS: State of the Art CAble MOdels for Spice}
 \newcommand{\DocumentSubSubTitle}{Open Souce Cable Models for EMI Simulations}
-\newcommand{\DocumentVersion}{1.1}
+\newcommand{\DocumentVersion}{1.2}
 \newcommand{\DocumentAuthors}{Christopher Smartt\footnote{\UONname, contact: Chris.Smartt@nottingham.ac.uk}, David Thomas$^1$, Steve Greedy$^1$, \\ Jaco Verpoorte\footnote{\NLRname, contact: Jaco.Verpoorte@nlr.nl}, Jesper Lansink Rotgerink$^2$ and Harmen Schippers$^2$}
 \newcommand{\License}{This document is subject to the GNU Free Documentation License (version 2.0).}
 \newcommand{\Reference}{ESA 40000112765/14/NL/HK}
@@ -0,0 +1,927 @@
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@@ -71,6 +71,10 @@ In addition to the data required to specify a cable bundle, additional flags may
 \item `verbose'    output detailed summary of the software operation and calculation results.\\
 \item `use\_Laplace'    use the numerical Laplace solver to calculate inductance and capacitance matrices for the external domain and any overshielded domains. By default, approximate analytic formulae are used. \\
 \item `plot\_mesh'    output a vtk file which shows the mesh used in Finite Element Laplace calculations.\\
+\item `direct\_solver'  Solve the Finite Element matrix equation using a direct solver i.e. by calculating the matrix inverse. \\
+\item `iterative\_solver'  Solve the Finite Element matrix equation using an iterative solver. This is much more efficient than the direct solver and is the default option \\    
+\item `inf\_gnd' Include the ground plane as a boundary condition on the y=0 boundary in the Finite Element Laplace solution for the bundle cross section. the outer boundary in this case is a semi-circle.   \\
+\item `finite\_gnd' Include the ground plane as a finite conductor in the Finite Element Laplace solution for the bundle cross section. In this case the ground plane is a finite rectangular conductor within a circular boundary.  \\
 \end{enumerate}
 If the Laplace solver is used then the mesh generation is be controlled by the parameters
@@ -86,10 +90,12 @@ If the Laplace solver is used then the mesh generation is be controlled by the p
                                        The edge length of elements on a cylindrical conductor of radius r is
                                        $\frac{r}{Laplace\_surface\_mesh\_constant}$. The default value is 3. \\
+\item `Max\_mesh\_edge\_length'  This (real) parameter determines the maximum finite element mesh edge length for the rectangular conductors of flex cables. It may be used to force an increase in mesh density in flex cables. \\
+                                   
 \end{enumerate}
 The default parameters are a compromise between accuracy and computation time for the Laplace solution. 
-The default values may be overridden by the user by appending the following to the end of the \textbf{.bundle\_spec file}:
+The default values may be overridden by the user by appending the following to the end of the \textbf{.bundle\_spec} file:
 \begin{verbatim}
 Laplace_boundary_constant
@@ -98,6 +104,14 @@ Laplace_surface_mesh_constant
 5
 \end{verbatim}
+If the iterative solver is used to solve the Finite Element matrix equations then the tolerance for the iterative solution may be set using the parameter $cg\_tol$. The default value is $10^{-12}$. The parameter may be set (in this example to 1E-14) by including the following lines int the \textbf{.bundle\_spec} file:
+
+\begin{verbatim}
+cg_tol
+1E-14
+\end{verbatim}
+
+
 A ground plane may be included in the bundle as shown in figure \ref{fig_ground_plane_specification}
 \begin{figure}[h]
@@ -214,6 +214,8 @@ The flags which may be applied in a \textbf{cable\_spec} file are as follows:
 \item `use\_Laplace'    use the numerical Laplace solver to calculate inductance and capacitance matrices for the internal domains. By default, approximate analytic formulae are used. \\
 \item `no\_Laplace'    use the (approximate) analytic formulae to calculate inductance and capacitance matrices for the internal domains. \\
 \item `plot\_mesh'    output a vtk file which shows the mesh used in Finite Element Laplace calculations.\\
+\item `direct\_solver'  Solve the Finite Element matrix equation using a direct solver i.e. by calculating the matrix inverse. \\
+\item `iterative\_solver'  Solve the Finite Element matrix equation using an iterative solver. This is much more efficient than the direct solver and is the default option \\
 \end{enumerate}
 If the Laplace solver is used then the mesh generation is controlled by the parameter
@@ -229,6 +231,13 @@ Laplace_surface_mesh_constant
 5
 \end{verbatim}
+If the iterative solver is used to solve the Finite Element matrix equations then the tolerance for the iterative solution may be set using the parameter $cg\_tol$. The default value is $10^{-12}$. The parameter may be set (in this example to 1E-14) by including the following lines int the \textbf{.cable\_spec} file:
+
+\begin{verbatim}
+cg_tol
+1E-14
+\end{verbatim}
+
 \subsection{Cable models available} \label{available_cable_models}
 The available cable models are described below. For each cable type a figure is provided which shows the cable cross section and the conductor numbering used for the cable. The parameters required to specify a cable are outlined and an example \textbf{.cable\_spec} file is provided.
@@ -809,29 +818,41 @@ Overshield
 \subsubsection{Flex cable} \label{flex_cable}
-Figure \ref{fig:flex_cable} shows the cross section of the flex cable model.
-A description of the model parameters is described in table \ref{table_flex_cable} followed by an example. The flex cable differs from most other cable models in that the number of conductors is a parameter of the model. The conductors are numbered from left to right. 
+Version 4.0.0 of the SACAMOS software introduces a new flex cable model in which more than one row of conductors can be included within the rectangular dielelctric region. This allows flex cables with multiple layers as well as cables with different conductor dimensions and spacings to be simulated. 
+Figure \ref{fig:flex_cable} shows the cross section of the new flex cable model.
+A description of the model parameters is described in table \ref{table_flex_cable} followed by an example. The flex cable differs from most other cable models in that the number of conductors is a parameter of the model. The conductors are numbered from left to right in each row. 
 \begin{figure}[h]
 \centering
-\includegraphics[scale=0.5]{./Imgs/flex_cable.eps}
+\includegraphics[scale=0.65]{./Imgs/ML_flex_cable.eps}
 \caption{flex cable}
 \label{fig:flex_cable}
 \end{figure}
+
 \begin{table}[h]
 \begin{center}
     \begin{tabular}{ |  p{3cm} | p{3cm} | p{6cm} |}
     \hline
 example value     & unit          & Comment \\ \hline
 8             & integer       & Number of conductors - can be any number of conductors in a flex cable model \\ \hline
-6             & integer       & Number of parameters, always 6 for flex cables \\ \hline
-1.0e-3       & metre         & parameter 1: conductor width (x) \\ \hline
-0.2e-3       & metre         & parameter 2: conductor height (y) \\ \hline
-0.6e-3       & metre         & parameter 3: conductor separation (x)\\ \hline
-1.0e-3       & metre         & parameter 4: dielectric offset in x \\ \hline
-0.2e-3       & metre         & parameter 5: dielectric offset in y \\ \hline
-5E7          & Siemens/metre & parameter 6: conductivity \\ \hline
+6             & integer       & Number of parameters = (number of rows of conductors)*6+4 \\ \hline
+6.0e-3        & metre         & parameter 1: dielectric width (x) \\ \hline
+1.2e-3        & metre         & parameter 2: dielectric height (y) \\ \hline
+2             & integer       & parameter 3: number of rows of conductors\\ \hline
+1.0e-3       & metre         &  parameter 4: row 1 centre offset x               \\ \hline
+0.4e-3       & metre         &  parameter 5: row 1 centre offset y                \\ \hline
+0.6e-3       & metre         &  parameter 6: row 1 conductor width (x dimension)  \\ \hline
+1.0e-4       & metre         &  parameter 7: row 1 conductor height (y dimension)  \\ \hline
+0.2e-3       & metre         &  parameter 8: row 1 conductor separation            \\ \hline
+3            & metre         &  parameter 9: row 1 number of conductors            \\ \hline
+1.0e-3       & metre         &  parameter 10: row 2 centre offset x               \\ \hline
+-0.4e-3      & metre         &  parameter 11: row 2 centre offset y                \\ \hline
+0.6e-3       & metre         &  parameter 12: row 2 conductor width (x dimension)  \\ \hline
+1.0e-4       & metre         &  parameter 13: row 2 conductor height (y dimension)  \\ \hline
+0.2e-3       & metre         &  parameter 14: row 2 conductor separation            \\ \hline
+3            & metre         &  parameter 15: row 2 number of conductors            \\ \hline
+5E7          & Siemens/metre & parameter 16: conductivity \\ \hline
 1	      &  integer      & number of frequency dependent parameters \\ \hline
 $\epsilon\left(j\omega \right)$ & rational function coefficients & Frequency dependent dielectric relative permittivity model\\ \hline
     \end{tabular}
@@ -848,24 +869,30 @@ $\epsilon\left(j\omega \right)$ &amp; rational function coefficients &amp; Frequency dep
 \begin{verbatim}
 #MOD_cable_lib_dir
 .
-Flex_cable
+flex_cable
 3		# number of conductors
-6		# number of parameters
-1.0e-3  	# parameter 1: conductor width (x dimension)
-0.25e-3  	# parameter 2: conductor height (y dimension)
-0.5e-3  	# parameter 3: conductor separation (x dimension)
-0.2e-3  	# parameter 4: dielectric offset x
-0.1e-3  	# parameter 5: dielectric offset y
-5E7  	        # parameter 6: conductivity
+10		# number of parameters
+5.0e-3          # parameter 1: dielectric width (x dimension)
+1.25e-3  	# parameter 2: dielectric height (y dimension)
+1               # parameter 3: number of rows of conductors
+0.0e-3  	# parameter 4: row 1 centre offset x
+0.0e-3  	# parameter 5: row 1 centre offset y
+1.0e-3          # parameter 6: row 1 conductor width (x dimension)
+0.25e-3         # parameter 7: row 1 conductor height (y dimension)
+0.5e-3          # parameter 8: row 1 conductor separation
+3               # parameter 9: row 1 number of conductors
+0.0  	        # parameter 10: conductivity
 1		# number of frequency dependent parameters
 # dielectric relative permittivity model follows
-   1E9          # w normalisation constant
-           1    # a order, a coefficients follow below:
-  2.2      2.0     
-           1    # b order, b coefficients follow below:
-  1.0      1.0
+   1E9        # w normalisation constant
+           0   # a order, a coefficients follow below:
+  2.2         
+           0   # b order, b coefficients follow below:
+  1.0      
 \end{verbatim}
+When creating cable bundle models including flex cables the mesh control parameter $Max\_mesh\_edge\_length$ may be used to give an additional degree of control over the Finite Element mash. The number of mesh elements in the y direction on conductors (height) is set by the $Laplace\_surface\_mesh\_constant$ parameter (although the minimum number is two). 
+
 \clearpage
 \subsubsection{D connector} \label{Dconnector}
@@ -2,7 +2,7 @@
 \section{Software overview}
-The purpose of the SACAMOS software is to enable the creation of Spice cable models from the description/ characterisation of cables and bundles of cables together with information required to specify a particular modelling scenario (for example the specification of incident field excitation or transfer impedance coupling model). 
+The purpose of the SACAMOS software is to enable the creation of Spice cable models from the description/ characterisation of cables and bundles of cables together with information required to specify a particular modelling scenario (for example the specification of incident field excitation or transfer impedance coupling model). This User Guide relates to version 4.0.0 of the SACAMOS software.
 A cable bundle may consist of multiple individual cables usually with the addition of a ground plane. This is illustrated in figure\ref{fig_cable_bundle} The cables may consist of shielded and/ or unshielded conductors.
@@ -3,7 +3,7 @@
 \newcommand{\DocumentTitle}{User Guide}
 \newcommand{\DocumentSubTitle}{SACAMOS: State of the Art CAble MOdels for Spice}
 \newcommand{\DocumentSubSubTitle}{Open Souce Cable Models for EMI Simulations}
-\newcommand{\DocumentVersion}{1.1}
+\newcommand{\DocumentVersion}{1.2}
 \newcommand{\DocumentAuthors}{Christopher Smartt\footnote{\UONname, contact: Chris.Smartt@nottingham.ac.uk}, David Thomas$^1$, Steve Greedy$^1$, \\ Jaco Verpoorte\footnote{\NLRname, contact: Jaco.Verpoorte@nlr.nl}, Jesper Lansink Rotgerink$^2$ and Harmen Schippers$^2$}
 \newcommand{\License}{This document is subject to the GNU Free Documentation License (version 2.0).}
 \newcommand{\Reference}{ESA 40000112765/14/NL/HK.}
@@ -106,6 +106,8 @@ IMPLICIT NONE
                                                  ! if Laplace_surface_mesh_constant=5 we have just over 30 elements on the circumference
   real(dp) ::  max_mesh_edge_length=1d30          ! the maximum mesh edge length on internal boundaries
+                                           
+  real(dp) ::  cg_tol=1d-12          ! tolerance for conjugate gradient solution of Finite element Laplace matrix equation
   real(dp) ::  Twisted_pair_equivalent_radius=1.5d0 ! The twisted pair commmon mode interaction is calculated by treating the
                                                     ! common mode as being carried on an 'equivalent cylindrical conductor'
@@ -25,9 +25,9 @@
 ! 
 ! The University of Nottingham can be contacted at: ggiemr@nottingham.ac.uk
 !
-! SUBROUTINE solve_real_symm(n, b, x,tol)
+! SUBROUTINE solve_real_symm(n, b, x,tol,itmax)
 ! SUBROUTINE dot ( n, x, y ,res)
-! SUBROUTINE solve_complex_symm(n, b, x,tol)
+! SUBROUTINE solve_complex_symm(n, b, x,tolitmax)
 ! SUBROUTINE zdot ( n, x, y ,res)
 !
 ! NAME
@@ -44,7 +44,7 @@
 !
 ! COMMENTS
 ! 
-SUBROUTINE solve_real_symm(n, b, x,tol)
+SUBROUTINE solve_real_symm(n, b, x,tol,itmax)
 USE type_specifications
@@ -57,6 +57,7 @@ integer,intent(IN) :: n
 real(dp),intent(IN) :: b(n)
 real(dp),intent(INOUT) :: x(n)   ! x contains the initial guess for x
 real(dp),intent(IN) :: tol
+integer,intent(IN) :: itmax
 ! local variables
@@ -115,7 +116,7 @@ minres=.TRUE.
   pkb=rkb
 ! iteration loop
-  do itloop=1,2*n
+  do itloop=1,itmax
 ! calculate ak=(rkb.rk)/(pkb.A.pk)
@@ -167,7 +168,11 @@ minres=.TRUE.
   end do ! next iteration
-! finish
+! We only get here if the iterative solution has not converged after itmax iterations
+
+  run_status='ERROR in solve_real_symm: maximum number of iterations exceeded'
+  CALL write_program_status()
+  STOP 1
   RETURN
@@ -219,7 +224,7 @@ END SUBROUTINE dot
 !
 ! COMMENTS
 ! 
- SUBROUTINE solve_complex_symm(n, b, x,tol)
+ SUBROUTINE solve_complex_symm(n, b, x,tol,itmax)
 USE type_specifications
@@ -232,6 +237,7 @@ integer,intent(IN) :: n
 complex(dp),intent(IN) :: b(n)
 complex(dp),intent(INOUT) :: x(n)   ! x contains the initial guess for x
 real(dp),intent(IN) :: tol
+integer,intent(IN) :: itmax
 ! local variables
@@ -291,7 +297,7 @@ minres=.TRUE.
   pkb=rkb
 ! iteration loop
-  do itloop=1,2*n
+  do itloop=1,itmax
 ! calculate ak=(rkb.rk)/(pkb.A.pk)
@@ -343,7 +349,11 @@ minres=.TRUE.
   end do ! next iteration
-! finish
+! We only get here if the iterative solution has not converged after itmax iterations
+ 
+  run_status='ERROR in solve_complex_symm: maximum number of iterations exceeded'
+  CALL write_program_status()
+  STOP 1
   RETURN
@@ -284,23 +284,10 @@ integer      :: ierr   ! error code for matrix inversion
 ! variables for iterative solver
-logical  checkA 
 integer  itnlim 
 real(dp)   rtol   
-integer  nout
-logical  goodb
-logical  precon 
-real(dp)   shift
-
-integer istop, itn
-real(dp)  anorm, acond, rnorm, ynorm
-real(dp),allocatable :: r1(:)
-real(dp),allocatable :: r2(:)
-real(dp),allocatable :: vt(:)
-real(dp),allocatable :: wt(:)
-real(dp),allocatable :: yt(:)
-real(dp),allocatable :: bt(:)
+real(dp),allocatable :: bt(:)                ! real vectors for conjugate gradient solution for lossless problems
 real(dp),allocatable :: xt(:)
 logical :: lossy_dielectric                  ! flag to indicate lossy dielectric i.e. we must solve a complex problem
@@ -1095,19 +1082,9 @@ if (direct_solver) then
 else if(.NOT.lossy_dielectric) then
-  checkA = .true.
-  itnlim = N_unknown * 2
-  rtol   = 1.0D-12
-  nout=6
-  goodb=.FALSE.
-  precon = .FALSE.
-  shift=0d0
+  itnlim = N_unknown * 2  ! maximum number of iterations set to twice the number of unknowns
+  rtol   = cg_tol
-  allocate(r1(1:N_unknown))
-  allocate(r2(1:N_unknown))
-  allocate(vt(1:N_unknown))
-  allocate(wt(1:N_unknown))
-  allocate(yt(1:N_unknown))
   allocate(xt(1:N_unknown))
   allocate(bt(1:N_unknown))
@@ -1122,32 +1099,21 @@ else if(.NOT.lossy_dielectric) then
         b_tmp(1:N_unknown)=-matmul(K_rhs,v_tmp)
         bt(1:N_unknown)=b_tmp(1:N_unknown)
-! UoN conjugate gradient solution
-        CALL solve_real_symm(N_unknown, bt, xt, rtol)
+! conjugate gradient solution
+        CALL solve_real_symm(N_unknown, bt, xt, rtol, itnlim)
         x(j1,j2,1:N_unknown)=xt(1:N_unknown)
       end do
   end do
-  deallocate(r1)
-  deallocate(r2)
-  deallocate(vt)
-  deallocate(wt)
-  deallocate(yt)
   deallocate(xt)
   deallocate(bt)
 else if (lossy_dielectric) then
-  itnlim=4*N_unknown
-  nout=6
-  wantse=.FALSE.
-  atol=1D-8
-  btol=1d-8
-  conlim=1d10
-  damp=0d0
-  allocate(se(1:N_unknown))
+  itnlim = N_unknown * 2  ! maximum number of iterations set to twice the number of unknowns
+  rtol   = cg_tol
 ! Iterative solution
    do j1=1,jmax-1
@@ -1155,20 +1121,15 @@ else if (lossy_dielectric) then
         v_tmp(1:n_known)=V(j1,j2,1:n_known)
         b_tmp(1:N_unknown)=-matmul(K_rhs,v_tmp)
-        n=N_unknown
-        m=N_unknown
-        
-! UoN conjugate gradient solution
-        rtol   = 1.0D-12
-        CALL solve_complex_symm(N_unknown, b_tmp, x_tmp, rtol)
+              
+! conjugate gradient solution
+        CALL solve_complex_symm(N_unknown, b_tmp, x_tmp, rtol,itnlim )
         x(j1,j2,1:N_unknown)=x_tmp(1:N_unknown)
       end do
   end do
-  
-  deallocate(se)
-       
+         
 end if
 ! STAGE 12 Determine the voltage phi in each node of the mesh
@@ -347,19 +347,23 @@ integer        :: dim
 ! redefine mesh generation parameters if required
     if (INDEX(line,'laplace_boundary_constant').NE.0) then
-      read(bundle_spec_file_unit,*,END=100,ERR=100)Laplace_boundary_constant
+      read(bundle_spec_file_unit,*,END=9000,ERR=9000)Laplace_boundary_constant
     end if
     if (INDEX(line,'laplace_surface_mesh_constant').NE.0) then
-      read(bundle_spec_file_unit,*,END=100,ERR=100)Laplace_surface_mesh_constant
+      read(bundle_spec_file_unit,*,END=9000,ERR=9000)Laplace_surface_mesh_constant
     end if
     if (INDEX(line,'twisted_pair_equivalent_radius').NE.0) then
-      read(bundle_spec_file_unit,*,END=100,ERR=100)Twisted_pair_equivalent_radius
+      read(bundle_spec_file_unit,*,END=9000,ERR=9000)Twisted_pair_equivalent_radius
     end if
     if (INDEX(line,'max_mesh_edge_length').NE.0) then
-      read(bundle_spec_file_unit,*,END=100,ERR=100)max_mesh_edge_length
+      read(bundle_spec_file_unit,*,END=9000,ERR=9000)max_mesh_edge_length
+    end if
+    
+    if (INDEX(line,'cg_tol').NE.0) then
+      read(bundle_spec_file_unit,*,END=9000,ERR=9000)cg_tol
     end if
   end do  ! continue until all flags are read - indicated by an end of file.
@@ -485,7 +489,12 @@ integer        :: dim
   run_status='Finished_Correctly'
   CALL write_program_status()
-
+  
+  STOP
+ 
+9000    run_status='ERROR reading control parameter from the bundle_spec file'
+        CALL write_program_status()
+        STOP 1
 END PROGRAM cable_bundle_model_builder
@@ -430,19 +430,23 @@ integer        :: i
 ! redefine mesh generation parameters if required
     if (INDEX(line,'laplace_boundary_constant').NE.0) then
-      read(cable_spec_file_unit,*,END=100,ERR=100)Laplace_boundary_constant
+      read(cable_spec_file_unit,*,END=9000,ERR=9000)Laplace_boundary_constant
     end if
     if (INDEX(line,'laplace_surface_mesh_constant').NE.0) then
-      read(cable_spec_file_unit,*,END=100,ERR=100)Laplace_surface_mesh_constant
+      read(cable_spec_file_unit,*,END=9000,ERR=9000)Laplace_surface_mesh_constant
     end if
     if (INDEX(line,'twisted_pair_equivalent_radius').NE.0) then
-      read(cable_spec_file_unit,*,END=100,ERR=100)Twisted_pair_equivalent_radius
+      read(cable_spec_file_unit,*,END=9000,ERR=9000)Twisted_pair_equivalent_radius
     end if
     if (INDEX(line,'max_mesh_edge_length').NE.0) then
-      read(cable_spec_file_unit,*,END=100,ERR=100)max_mesh_edge_length
+      read(cable_spec_file_unit,*,END=9000,ERR=9000)max_mesh_edge_length
+    end if
+    
+    if (INDEX(line,'cg_tol').NE.0) then
+      read(cable_spec_file_unit,*,END=9000,ERR=9000)cg_tol
     end if
   end do  ! continue until all flags are read - indicated by an end of file.
@@ -532,6 +536,12 @@ integer        :: i
   run_status='Finished_Correctly'
   CALL write_program_status()
+  STOP
+ 
+9000    run_status='ERROR reading control parameter from the cable_spec file'
+        CALL write_program_status()
+        STOP 1
+  
 END PROGRAM cable_model_builder