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% Aachen 99 Vortrag
% Author: H. Kroha
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{\fancyplain{\tiny IEEE NSS Symposium, 19/10/2000}%
{\tiny IEEE NSS Symposium, 19/10/2000}}
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{\fancyplain{\tiny H.~Kroha, MPI f\"ur Physik, Munich}%
{\tiny H.~Kroha, MPI f\"ur Physik, Munich}}

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\begin{center}
\Blue{\fbox{\Large\bf Drift Tube Quality Control}}
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\vspace{8mm}
\Red{\Large\bf Extensive test program:}
\vspace{10mm}

\begin{normalsize}
\begin{tabular}{|l|l|l|}

\hline
{\bf Measurement} & {\bf Requirement} & {\bf Achieved} \\

\hline
{\bf 1.\ Drift tube length at} {\boldmath $20\pm 1^\circ$}{\bf C:} & \Blue{{\boldmath $\pm 0.5$}~{\bf mm}} & \Red{{\boldmath $\pm 0.5$}~{\bf mm}} \\

\hline
{\bf 2.\ X-ray meas.\ of wire location:} & \Blue{{\boldmath $\le 10~\mu$}{\bf m (rms)}} & \Red{{\boldmath $\le 7~\mu$}{\bf m (rms)}} \\

\hline
{\bf 3.\ Gas leak rate at 3~bar:} & \Blue{{\boldmath $\le 10^{-8}$}~{\bf bar}{\boldmath $\cdot l$}{\bf /s}} &
\Red{{\boldmath $<1\%$} {\bf failure rate}} \\

\hline
{\bf 4.\ HV test with Ar:CO}{\boldmath $_2$} {\bf (93:7) at 3~bar:} & & \\
{\bf \hphantom{3.\ }Dark current at 3.4~kV} {\boldmath $(10^5$} {\bf  gas gain):} & \Blue{{\boldmath $\le 2$}~{\bf nA/m}} & 
\Red{{\boldmath $<2\%$} {\bf failure rate}} \\

\hline
{\bf 5.\ Wire tension (osc.\ frequency):} & \Blue{{\boldmath $350\pm 7$}~{\bf g (rms)}} & \Red{{\boldmath $\pm 7$}~{\bf g (rms)}} \\

{\bf \hphantom{4.\ }}{\boldmath $\Longrightarrow$} {\bf Wire sag:} & \Blue{{\boldmath $195~\pm 4\mu$}{\bf m (rms)}} & 
\Red{{\boldmath $\pm 4~\mu$}{\bf m (rms)}} \\
\hline

\end{tabular}


\vspace{10mm}
{\bf Current overall failure rate at start of production:} {\boldmath $3\%,$}\hfill\break
{\bf i.e.\ 1000 out of 35000 drift tubes.}
\end{normalsize}


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