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\section{Contents of a \dir{mc} Directory}\label{sect:mcdir}
This directory contains information generated by the \moc{MC:} multigroup Monte Carlo
module.
\subsection{State vector content for the \dir{mc} data structure}\label{sect:mcstate}
The dimensioning parameters for the \dir{mc} data structure, which are stored in
the state vector $\mathcal{S}^{mc}$, represent:
\begin{itemize}
\item Nominal number of source histories $M$ per $K_{\rm eff}$ cycle $N_{\rm nsrck}=\mathcal{S}^{mc}_{1}$
\item Number of source cycles $I_{\rm c}$ to skip before $K_{\rm eff}$ accumulation $N_{\rm ikz}=\mathcal{S}^{mc}_{2}$
\item Total number of cycles $N$ in the problem $N_{\rm kct}=\mathcal{S}^{mc}_{3}$
\item Initial seed for the random number generator $S=\mathcal{S}^{mc}_{4}$
\item N2N processing flag $F=\mathcal{S}^{mc}_{5}$
\begin{displaymath}
F = \left\{
\begin{array}{ll}
0 & \textrm{do not use information in the {\tt 'N2N} and {\tt 'N3N} records} \\
1 & \textrm{use information in the {\tt 'N2N} and {\tt 'N3N} records to perform
the random walk}
\end{array} \right.
\end{displaymath}
\item Type of tallies $T=\mathcal{S}^{mc}_{6}$
\begin{displaymath}
T = \left\{
\begin{array}{ll}
0 & \textrm{no tallies} \\
1 & \textrm{effective multiplication factor tally} \\
2 & \textrm{effective multiplication factor {\sl and} macrolib tallies}
\end{array} \right.
\end{displaymath}
\item The number of homogenized mixtures in the macrolib tally ${M_{\rm out}}=\mathcal{S}^{mc}_{7}$
\item The number of condensed energy groups in the macrolib tally ${G_{\rm out}}=\mathcal{S}^{mc}_{8}$
\item The number of regions in the initial geometry ${N_{\rm in}}=\mathcal{S}^{mc}_{9}$
\end{itemize}
\subsection{The main \dir{mc} directory}\label{sect:mcdirmain}
The following records and sub-directories will be found on the first level of a \dir{mc}
directory:
\begin{DescriptionEnregistrement}{Main records and sub-directories in \dir{mc}}{8.0cm}
\CharEnr
{SIGNATURE\blank{3}}{$*12$}
{Signature of the \dir{mc} data structure ($\mathsf{SIGNA}=${\tt L\_MC\blank{8}}).}
\IntEnr
{STATE-VECTOR}{$40$}
{Vector describing the various parameters associated with this data structure
$\mathcal{S}^{mc}_{i}$, as defined in \Sect{mcstate}.}
\RealEnr
{K-EFFECTIVE\blank{1}}{$1$}{}
{Effective multiplication factor $K_{\mathrm{eff}}$}
\RealEnr
{K-EFFECTI-SD}{$1$}{}
{Standard deviation of the effective multiplication factor $\Delta K_{\mathrm{eff}}$}
\OptIntEnr
{REF:IMERGE\blank{2}}{$N_{\rm in}$}{$T =2$}
{Merged region number associated with each of the original region number in the macrolib tally $M_{r}$}
\OptIntEnr
{REF:IGCOND\blank{2}}{$G_{\rm out}$}{$T =2$}
{Reference group limits associated with the condensed groups in the macrolib tally $C_{g}$}
\OptDirEnr
{MACROLIB\blank{4}}{$T =2$}
{Directory containing the \dir{macrolib} structure associated with the
macrolib tally, following the specification presented in \Sect{macrolibdirmain}.}
\end{DescriptionEnregistrement}
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