- Added support for EMBL PSD detectors for TRIS and AMOR.

sinqhm/hist_mem_spec.tex

@@ -1509,8 +1509,80 @@
 %
     \label{SubSect-PSD}
 %
-      Position Sensitive Detector operation of the histogram memory has still
-      to be defined.
+      The instruments TRICS and AMOR  use 2D position sensitive detectors
+      provided by the EMBL at ILL. These detectors have a delay line 
+      readout. This means the detector readout for each neutron is two
+      delay values. From these values the actual detector positions can be
+      calculated from the formula:
+      \begin{equation}
+	pos = \frac{(delay - offset)}{factor}
+      \end{equation}      
+      Thus the configuration message must carry two additional values for each
+      of the two detector dimensions. 
+
+      AMOR will be operated in time--of--flight mode. For TRICS this is not
+      necessary. However, as the data telegrams coming from the fibre optic
+      link contain the time binning information in any case it was decided
+      to treat both conditions equally as a variation of the time--of--flight
+      case. For a description of the edge and bank data structures
+      involved  see \ref{SubSect-TOF}. TRICS detectors will then be
+      treated as a time--of--flight detector with a single huge timebin.
+      
+     Thus the  SQHM{\usc}{\usc}HM{\usc}PSD configuration command looks as follows:
+      \begin{center}\begin{picture}(125,105)(0,-105)
+       \linethickness{0.15mm} \put(0,0){
+	\put(0, -7){\Topbox{big-end-id}}
+	\put(0,-14){\Midbox{SQHM{\usc}CONFIG}}
+	\put(0,-21){\Midbox{SQHM{\usc}{\usc}HM{\usc}{\usc}PSD}}
+	\put(0,-28){\Midbox{extra-bytes}}
+	\put(0,-35){\Midwordbox{n-banks}{n-edges}}
+	\put(0,-42){\Midbox{preset-delay}}
+	\put(0,-49){\Midwordbox{x-Factor}{y-Factor}}
+	\put(0,-56){\Midwordbox{X Offset}{Y Offset}}
+	\put(0,-63){\Midwordbox{x Size}{y Size}}
+	\put(0,-70){\Midbox{}}
+	\put(0,-76){\Midbodydashed{edge[0] $\ldots$ edge[n-edges]}}
+	\put(0,-84){\Botbody{}}
+	\put(0,-91){\Midbox{}}
+	\put(0,-98){\Midbodydashed{bank[0] $\ldots$ bank[n-banks]}}
+	\put(0,-105){\Botbody{}}
+       }
+      \end{picture}\end{center}
+%
+      \begin{center}\begin{tabular}{|llp{68mm}|} \hline
+	\Tabrow{\textbf{Field}}{Symbol Name}{\textbf{Description}} \hline
+	\Tabrow{big-end-id}{bigend}{See Section~\ref{Sect-sinqhm-comm}}
+	\Tabrow{SQHM{\usc}CONFIG}{cmnd}{Command verb}
+	\Tabrow{SQHM{\usc}{\usc}HM{\usc}{\usc}PSD}{mode}{The selected mode}
+	\Tabrow{extra-bytes}{$<$prefix$>$.n{\usc}extra{\usc}bytes}{Number of
+						extra bytes to read.}
+	\Tabrow{n-edges}{$<$prefix$>$.n{\usc}edges}{Number of edge arrays
+						following.}
+	\Tabrow{n-banks}{$<$prefix$>$.n{\usc}banks}{Number of counter banks
+						following.}
+	\Tabrow{preset-delay}{$<$prefix$>$.preset{\usc}delay}{Time delay for
+					sending to multi-detector interface.}
+
+	\Tabrow{x-Factor}{$<$prefix$>$.xFactor}{Division factor for
+calculating x position.}
+	\Tabrow{y-factor}{$<$prefix$>$.yFactor}{Division factor for
+calculating y position.}
+
+	\Tabrow{x Offset}{$<$prefix$>$.xOffset}{Offset value  for
+calculating x position.}
+	\Tabrow{y Offset}{$<$prefix$>$.yOffset}{Offset value for
+calculating y position.}
+
+	\Tabrow{xSize}{$<$prefix$>$.xSize}{Number of detector wires in
+x direction.}
+	\Tabrow{ySize}{$<$prefix$>$.ySize}{Number of detector wires in
+y direction.}
+	\Tabrow{edge[i]}{$<$prefix$>$.edge{\usc}0}{An edge array.}
+	\Tabrow{bank[j]}{$<$prefix$>$.bank{\usc}0}{A counter bank.}
+	\hline
+      \end{tabular}\end{center}
+
+
 %
       \newpage
 %