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\section{Contents of a \dir{source} directory}\label{sect:sourcedir}
This directory contains the source components of a fixed source problem. This data structure is also useful for
{\sl fixed source eigenvalue problems} as used in the generalized perturbation theory (GPT).
\subsection{State vector content for the \dir{source} data structure}\label{sect:sourcestate}
The dimensioning parameters for this data structure, stored in the state vector
$\mathcal{S}^{sou}_{i}$, represent:
\begin{itemize}
\item The number of energy groups $N_{G}=\mathcal{S}^{sou}_{1}$
\item The number of unknowns per energy group $N_{U}=\mathcal{S}^{sou}_{2}$
\item The number of direct fixed sources $N_{D}=\mathcal{S}^{sou}_{3}$
\item The number of adjoint fixed sources $N_{A}=\mathcal{S}^{sou}_{4}$
\end{itemize}
\subsection{The main \dir{source} directory}\label{sect:sourcedirmain}
On its first level, the following records and sub-directories will be found in the \dir{source} directory:
\begin{DescriptionEnregistrement}{Main records and sub-directories in \dir{source}}{8.0cm}
\CharEnr
{SIGNATURE\blank{3}}{$*12$}
{Signature of the data structure ($\mathsf{SIGNA}=${\tt L\_SOURCE\blank{4}})}
\IntEnr
{STATE-VECTOR}{$40$}
{Vector describing the various parameters associated with this data structure $\mathcal{S}^{sou}_{i}$,
as defined in \Sect{sourcestate}.}
\CharEnr
{TRACK-TYPE\blank{2}}{$*12$}
{Type of tracking considered ($\mathsf{CDOOR}$). Allowed values are:
{\tt 'EXCELL'}, {\tt 'SYBIL'}, {\tt 'MCCG'}, {\tt 'SN'}, {\tt 'BIVAC'} and {\tt 'TRIVAC'}.}
\CharEnr
{LINK.FLUX\blank{3}}{$*12$}
{Name of the unperturbed {\sc flux} orthogonal to the fixed sources.}
\CharEnr
{LINK.SYSTEM\blank{1}}{$*12$}
{Name of the unperturbed {\sc system} object.}
\CharEnr
{LINK.TRACK\blank{2}}{$*12$}
{Name of the tracking object used to construct the system matrices.}
\OptDirlEnr
{DSOUR\blank{7}}{$\mathcal{S}^{sou}_{3}$}{$\mathcal{S}^{sou}_{3}\ge 1$}
{List of direct fixed source sub-directories. Each component of this list is a multigroup list of
dimension $\mathcal{S}^{sou}_{1}$. Each component of the multigroup list is a real array of dimension
$\mathcal{S}^{sou}_{2}$ containing a direct fixed source array.}
\OptDirlEnr
{ASOUR\blank{7}}{$\mathcal{S}^{sou}_{4}$}{$\mathcal{S}^{sou}_{4}\ge 1$}
{List of adjoint fixed source sub-directories. Each component of this list is a multigroup list of
dimension $\mathcal{S}^{sou}_{1}$. Each component of the multigroup list is a real array of dimension
$\mathcal{S}^{sou}_{2}$ containing an adjoint fixed source array}
\end{DescriptionEnregistrement}
\eject
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