add progress14

progress14/Improvements.tex

@@ -0,0 +1,42 @@
+The AlCap 2013 run demonstrated that the setup was capable of
+performing this demanding charged particle experiment and led to
+preliminary results. In R2015 we plan to improve several aspects which
+will reduce the systematic uncertainty and improve the quality of the
+final result.
+
+\begin{itemize}
+
+\item
+\textbf{Beam profile measurements at target location.}
+We intend to assemble a small probe
+which  can be inserted to measure the beam profile at the target 
+position for all measurements.  Two possible methods are under
+consideration: the first uses a series of crossed scintillating fibres
+read-out with MPPCs, the second uses a single fibre which is scanned 
+across the beam.
+
+\item
+\textbf{Beam and detector geometry in the vacuum chamber.} We plan an 
+improved mechanics and surveying method for determining the relative
+target and detector positions.
+
+\item
+\textbf{Improved silicon detector frontend.} We plan to suppress noise
+  and increase the stability of the Si detector readout, by placing
+  the preamplifiers inside the vacuum chamber. In addition, the shaping
+  constants of the fast preamplier outputs were not optimised, which
+  led to significant noise or undershoots in those signals.
+ 
+\item
+\textbf{DAQ.} The FADCs experienced data losses in high rate situations,
+  e.g. when using the silicon detector as active target. This data
+  quality issue will be eliminated by purchasing, and carefully
+  testing, new wave form digitisers from CAEN or SIS.
+
+\item
+\textbf{Ge detector.} The time resolution of the Ge detector was
+  only 66 ns FWHM, larger than specified (10 ns). This problem will addressed
+  with careful comparisons of analogue and digitised readout chains in our university labs. 
+
+\end{itemize}
+