\begin{itemize}

\item
\textbf{Active silicon target 1.5~mm and 50~\textmu m, 4 days}. The R2015
charged particle run will begin
 with an Si active
target, as this target is ideal for setting up the experiment. 
The emission spectrum in a thick Si detector was measured in 2013 
and compared to 
the only low energy proton spectrum in the literature. However, the 
measurement is partially compromised with FADC data losses and an 
unoptimised fast signal
chain. The emission spectrum in a new thin silicon detector will be 
measured, to verify the overall measurement strategy, as the rate 
and spectrum are known from the thick Si measurement. Moreover, the 
active detector will allow the reconstruction of the response matrix.

\item
\textbf{Aluminium 50~\textmu m, 3 days}. This measurement should corroborate a key result of the charged particle measurement program
under a  well defined condition. The statistics and improved signal to
noise will 
completely cover the emission spectrum. In particular, the shaping
times of the fast signals
will be optimised. This will allow the rejection of background events 
due to muon stops with proton emission in
the Si detectors.


\item
\textbf{Titanium 100~\textmu m,  50~\textmu m, 3 days}. This measurement
will characterise proton emission in muon capture on titanium, which
is a promising
target option for future muon-electron conversion experiments.

\end{itemize}
