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+\subsection{The tracking modules}\label{sect:TRKData}
+
+A tracking module is required to analyze a spatial domain (geometry) assuming
+a specific algorithm will be used for the collision probability or method of characteristics
+calculations.  It performs zone numbering operations, volume and surface area
+calculations and generates the required  integration lines for a geometry that
+was previously defined in the \moc{GEO:} module. These operations are carried
+out differently depending on the solution algorithm used.
+
+\vskip 0.15cm
+
+Many different operators are available for tracking in DRAGON. The \moc{SYBILT:} module
+is used for 1--D geometries (either plane, cylindrical or spherical) and
+interface current tracking inside heterogeneous blocks. The \moc{EXCELT:} module
+is used to perform full cell collision probability tracking with
+isotropic\cite{DragonPIJI,Mtl93a} or specular\cite{DragonPIJS1,Mtl93b}
+surface current. The \moc{NXT:} module is an extension of the \moc{EXCELT:}
+module to more complex geometry including assemblies of clusters in two and
+three dimensions.\cite{ige260}  The \moc{MCCGT:} module is an implementation of the open
+characteristics method of I.~R.~Suslov.\cite{mccg,suslov2}. These are the transport
+tracking modules which can be used everywhere in the code where tracking
+information needs to be generated. The \moc{SNT:} module is an implementation of
+the discrete ordinates (or $S_N$) method in 1-D/2-D/3-D geometries.
+The module \moc{BIVACT:} is used to perform a finite-element (diffusion or SP$_n$) 1-D/2-D
+tracking which may be required for diffusion synthetic acceleration (DSA) or homogenization
+purposes.\cite{BIVAC} The final module \moc{TRIVAT:} is used to perform a finite-element
+1-D/2-D/3-D tracking which may be required for DSA or homogenization purposes.\cite{TRIVAC}
+
+\vskip 0.15cm
+
+None of these modules can analyze all of the geometry available in the code
+DRAGON. In general, the restrictions that apply to a given tracking module
+result directly from the approximation associated with this method. Moreover, in
+other instances, some geometries which would have had the same tracking file
+generated by two different method, such as tube geometry for the \moc{SYBILT:}
+and \moc{EXCELT:} module, have been made available only to one of these tracking
+module (module \moc{SYBILT:} in this case).
+
+\vskip 0.15cm
+
+The general information resulting from these
+tracking is stored in a \dds{tracking} data structure.
+For the \moc{EXCELT:} and \moc{NXT:} modules, an additional sequential binary
+tracking file may be generated.
+
+\vskip 0.15cm
+
+The global numbering of the zones in a geometry proceeds following an
+order of priorities given by:
+
+\begin{itemize}
+
+\item the different rings of a cylindrical or spherical region starting with the
+inner most after mesh splitting;
+
+\item for a cluster regions located in a ring, two different numbering schemes are possible. For the \moc{EXCELT:} 
+module, one first numbers the region inside the pin in the same way as for cylindrical regions and finishes 
+by associating the next region number to the shell of the global geometry which contains this pin. If two 
+cluster types are located in a given ring, they are classified according to increasing \dusa{rpin} and \dusa{apin} and then 
+numbered in this order. Cluster overlapping annular region are numbered before considering the annular 
+regions. For the \moc{NXT:} module, each pin is numbered individually in a Cartesian region according to their 
+ordered in the \moc{CLUSTER} keywords and then the Cartesian regions are numbered sequentially. A description 
+of the explicit numbering of regions and surfaces can be found in report IGE-260.\cite{ige260}
+ 
+\item the zones in ascending order corresponding to the first axial component
+(normally $X$) after mesh splitting;
+
+\item the zones in ascending order corresponding to the second axial component
+(normally $Y$) after mesh splitting;
+
+\item the hexagonal zones corresponding to the order described in
+\Fig{s30} to \Fig{compl}.
+
+\item  the sub-geometry of type \moc{CARCELX}, \moc{CARCELY} and
+\moc{CARCELZ} are numbered assuming that the third component corresponds to 
+$X$, $Y$ and $Z$ respectively.
+
+\end{itemize}
+ 
+We should also note that symmetry conditions implicitly force the grouping of
+certain calculation zones.
+
+\vskip 0.2cm
+
+All the tracking operators of DRAGON share an identical general tracking data
+structure defined as
+
+\begin{DataStructure}{Structure \dstr{desctrack}}
+$[$ \moc{EDIT} \dusa{iprint} $]$\\
+$[$ \moc{TITL} \dusa{TITLE} $]$ \\
+$[$ \moc{MAXR} \dusa{maxreg} $]$\\
+$[$ $\{$ \moc{NORE} $|$ \moc{RENO} $|$ \moc{REND} $\}$ $]$
+\end{DataStructure}
+
+\noindent with
+
+\begin{ListeDeDescription}{mmmmmmm}
+
+\item[\moc{EDIT}] keyword used to modify the print level \dusa{iprint}.
+
+\item[\dusa{iprint}] index used to control the printing of this operator. The
+amount of output produced by this tracking operators will vary substantially
+depending on the print level specified. For example,
+
+\begin{itemize}
+
+\item when \dusa{iprint}=0 no output is produced;
+
+\item when \dusa{iprint}=1 a minimum amount of output is produced; the 
+main geometry properties are printed (fixed default option);
+
+\item when \dusa{iprint}$\ge$2 In addition to the information printed when
+using \dusa{iprint}=1 the zone numbering (zones associated with a flux) is
+printed;
+
+\end{itemize}
+
+\item[\moc{TITL}] keyword which allows the run title to be set.
+
+\item[\dusa{TITLE}] the title associated with a DRAGON run. This
+title may contain up to 72 characters. The default when \moc{TITL}  is not
+specified is no title.
+
+\item[\moc{MAXR}] keyword which permits the maximum number of regions to be
+considered during a DRAGON run to be specified.
+
+\item[\dusa{maxreg}] maximum dimensions of the problem to be considered.  The
+default value is set to the number of regions previously computed by the
+\moc{GEO:} module. However this value is generally insufficient if symmetries or
+mesh-splitting are specified.
+
+\item[\moc{NORE}] keyword to specify that the automatic normalization of the integration lines is deactivated.
+
+\item[\moc{RENO}]  keyword to specify the activation of the {\sl direction-independent} normalization procedure of the
+integration lines. The normalization factors are {\sl not} function of the subtracks directions. This option is only
+valid for modules \moc{NXT:}, \moc{EXCELT:} and \moc{SALT:}. This is the default option for \moc{NXT:} and \moc{SALT:}
+modules.
+
+\item[\moc{REND}]  keyword to specify the activation of the {\sl direction-dependent} normalization procedure of the
+integration lines. The normalization factors are function of the subtracks directions. This option is only valid for
+modules \moc{NXT:}, \moc{EXCELT:} and \moc{SALT:}. This is the default option for \moc{EXCELT:} module.
+
+\end{ListeDeDescription}
+\eject
+
+\input{Section3.04_sybil.tex} % structure (sybilT)
+\input{Section3.04_excell.tex} % structure (excellT)
+\input{Section3.04_nxt.tex} % structure (nxtT)
+\input{Section3.04_mccg.tex} % structure (mccgT)
+\input{Section3.04_sn.tex} % structure (snT)
+\input{Section3.04_bivac.tex} % structure (bivacT)
+\input{Section3.04_trivac.tex} % structure (trivacT)
+\input{Section3.90_salt.tex} % structure (salT)