\subsection{The \moc{/BIHET/} sub-directory}\label{sect:bihettrackingdir}

\vskip -0.3cm

\begin{DescriptionEnregistrement}{The contents of the
\moc{/BIHET/} sub-directory}{8.0cm}
\IntEnr
  {PARAM\blank{7}}{$8$}
  {Record containing the parameters related to a double-heterogeneity tracking
   $\mathcal{P}_{i}$} 
\IntEnr
  {NS\blank{10}}{$\mathcal{P}_{4}$}
  {Number of tubes or shells in each kind of micro structure}
\IntEnr
  {IBI\blank{9}}{$\mathcal{P}_{3}$}
  {Type of mixture in each generating region of the macro geometry}
\RealEnr
  {VOLUME\blank{6}}{$\mathcal{P}_{3}$}{cm$^3$~~~}
  {Volumes of the macro geometry}
\RealEnr
  {RS\blank{10}}{$\mathcal{P}_{5}+1,\mathcal{P}_{4}$}{cm}
  {Radii of the micro regions}
\RealEnr
  {FRACT\blank{7}}{$\mathcal{P}_{4},\mathcal{P}_{2}$}{}
  {Volume fraction of each type of micro region in each mixture}
\RealEnr
  {VOLK\blank{8}}{$\mathcal{P}_{4},\mathcal{P}_{5}$}{}
  {Volume fractions of the tubes or shells in the micro regions}
\IntEnr
  {IDIL\blank{8}}{$\mathcal{P}_{2}-\mathcal{P}_{1}$}
  {Elementary mixture indices in the diluent of the composite mixtures}
\IntEnr
  {MIXGR\blank{7}}{$\mathcal{P}_{5},\mathcal{P}_{4},\mathcal{P}_{2}-\mathcal{P}_{1}$}
  {Elementary mixture indices in the micro structures}
\end{DescriptionEnregistrement}

\noindent
with the dimension parameter $\mathcal{P}_{i}$, representing:

\begin{itemize}

\item The number of ordinary mixtures pointing to the macrolib. $\mathcal{P}_{1}$

\item The number of mixtures, including the composite mixtures (i.e., containing micro structures)
$\mathcal{P}_{2}$

\item The number of regions in the macro geometry $\mathcal{P}_{3}$

\item The number of different kinds of macro structures $\mathcal{P}_{4}=\mathcal{S}^{dh}_{1}$

 A kind of macro structure is characterized by the radii of its tubes or shells. All the micro region of the same kind should own
the same nuclear properties in a given macro region.

\item The maximum number of regions (tubes or shells) in each kind of macro structure
$\mathcal{P}_{5}=\mathcal{S}^{dh}_{2}-1$

\item The type of double-heterogeneity model $\mathcal{P}_{6}$
\noindent where
\begin{displaymath}
\mathcal{P}_{6} = \left\{
\begin{array}{rl}
 1 & \textrm{Sanchez-Pomraning model} \\
 2 & \textrm{Hebert model} \\
 3 & \textrm{She-Liu-Shi model} \\
\end{array} \right.
\end{displaymath}

\item The type of micro structures $\mathcal{P}_{7}=\mathcal{S}^{dh}_{5}$
\noindent where
\begin{displaymath}
\mathcal{P}_{7} = \left\{
\begin{array}{rl}
 3 & \textrm{Cylinder} \\
 4 & \textrm{Sphere} \\
\end{array} \right.
\end{displaymath}

\item The quadrature parameter for the 1-D collision probability calculation in the micro structures
$\mathcal{P}_{8}$

\end{itemize}

\eject
