Updated User documentation

doc/user/dmcman

@@ -16,9 +16,9 @@
 %html -s report
 \begin{center}
 \begin{huge}
-DMC--User Manual \\
+DMC and HRPT Reference  Manual \\
 \end{huge}
-Version \date\\
+Version \today\\
 Dr. Mark K\"onnecke \\
 Labor f\"ur Neutronenstreuung\\
 Paul Scherrer Institut\\
@@ -26,6 +26,25 @@ CH--5232 Villigen--PSI\\
 Switzerland\\
 \end{center}
 \clearpage
+
+\leftline{\large{Introduction}}
+Both DMC and HRPT are neutron powder diffractometers with a similar
+way of operation. Both instruments illuminate the sample with a
+monochromated neutron beam. The neutron beam gets diffracted at the
+sample and the difracted neutrons are collected in large
+banana shaped position sensitive detectors positioned around the
+sample. DMC has a counter array with 400 detectors, HRPT one with 1600
+detectors. The operation is simple: After adjustment of the wavelength
+and the two--theta position of the detector the diffracted intensity
+is collected for hours. HRPT can be installed at one out of two
+two--theta positions in relation to the monochromator. HRPT's
+monochromator may be exchanged through a monochrmoator lift
+assembly. Consequently HRPT has only a fixed set of wavelength
+available. DMC can be moved around the monochromator freely within the
+geometrical limits of the beamline. Thus DMC's wavelength may be
+adjusted to any value within its wavelength range. 
+     
+
 %html sicsinvoc.htm 1 
 %html general.htm 1
 %html basic.htm 1
@@ -44,7 +63,8 @@ Switzerland\\
 %html counter.htm   2
 %html samenv.htm 1
 %html dmcdev.htm 1
+%html hrptdev.htm 1
 %html trouble.htm 1
 %html dmco.htm    1
 
-\end{document}
+\end{document}