From: Samir Amar-Youcef <> Date: Mon, 3 Feb 2014 10:42:56 +0000 (+0100) Subject: First report version of samir X-Git-Url: https://jspc29.x-matter.uni-frankfurt.de/git/?a=commitdiff_plain;h=c33bc4ebd553fa6893c0852796a905c94ea0724e;p=reports.git First report version of samir --- diff --git a/GSI_2014_SA_BeamtimeResults/EffVsFakes.pdf b/GSI_2014_SA_BeamtimeResults/EffVsFakes.pdf new file mode 100644 index 0000000..7e8737a Binary files /dev/null and b/GSI_2014_SA_BeamtimeResults/EffVsFakes.pdf differ diff --git a/GSI_2014_SA_BeamtimeResults/JACoW-GSI-2013.cls b/GSI_2014_SA_BeamtimeResults/JACoW-GSI-2013.cls new file mode 120000 index 0000000..ae28ddc --- /dev/null +++ b/GSI_2014_SA_BeamtimeResults/JACoW-GSI-2013.cls @@ -0,0 +1 @@ +../JACoW-GSI-2013.cls \ No newline at end of file diff --git a/GSI_2014_SA_BeamtimeResults/ShiftSpillTime1.pdf b/GSI_2014_SA_BeamtimeResults/ShiftSpillTime1.pdf new file mode 100644 index 0000000..cbf83fe Binary files /dev/null and b/GSI_2014_SA_BeamtimeResults/ShiftSpillTime1.pdf differ diff --git a/GSI_2014_SA_BeamtimeResults/report.pdf b/GSI_2014_SA_BeamtimeResults/report.pdf new file mode 100644 index 0000000..ee75ee3 Binary files /dev/null and b/GSI_2014_SA_BeamtimeResults/report.pdf differ diff --git a/GSI_2014_SA_BeamtimeResults/report.tex b/GSI_2014_SA_BeamtimeResults/report.tex new file mode 100644 index 0000000..948bae6 --- /dev/null +++ b/GSI_2014_SA_BeamtimeResults/report.tex @@ -0,0 +1,105 @@ +\documentclass[a4paper]{JACoW-GSI} +%\documentclass[12pt,a4paper,oneside,ngerman]{article} +\usepackage{graphicx} +\usepackage{url} + +%% +%% VARIABLE HEIGHT FOR THE TITLE BOX (default 35mm) +%% + +\setlength{\titleblockheight}{27mm} + +\begin{document} +\title{Analysis of the CBM MVD prototype CERN SPS beam-time\thanks{supported by BMBF (05P12RFFC7), HIC for FAIR and GSI}} + +\author[1]{S Amar-Youcef} +\author[1]{K. ..} + +\affil[1]{Goethe-University, Frankfurt, Germany} + +\maketitle + +\section{Introduction} +As part of the development the MVD prototype was commissioned and extensively tested at a beam time at CERN SPS. +In doing so the performance of the sensors along with the customized frond-end and TRB based DAQ system was investigated +with regard to the synchronization and long-term stability of the continuous multi-channel readout, the positional stability and the sensor performance (efficiency, resolution, fake hit rate). +As sensors MIMOSA-26 was used, which is a sizable precursor to the final sensor. +It comprises the prototype readout concept including on-chip hit discrimination and data sparsification. +Further, the sensor is based on a high-resistivity epitaxy layer and was thinned down all up to a thickness of 50\ $\mu$m. + +Here, the results related to the analysis of the detection performance are discussed. +A discussion related to the DAQ can be found in \cite{BM, BM2} and related to the mechanics in \cite{TT}. +It should be shared that related to the synchronization and stability of the DAQ no reservation was diagnosed. +However, at highest occupancies and/or very low thresholds fluctuations in the supply voltage of the sensors were observed, which led to a bad sensor performance. +%The stability of the DAQ remained unaffected. + +\section{Setup} +Altogether 12 identical sensors were arranged in four single-sided reference and one double-sided DUT station, +whereas ``one side'' denotes two sensors side by side. +According to this the beam particles were tracked by up to 6 hit points. +Further the setup permitted to vary the relative arrangement of the stations and the relative inclination of the DUT, +which was positioned between two reference stations upstream and two downstream for best arm of lever. +In addition the temperature of the DUT could be varied independent of the temperature of the reference system. +The material budget amounts to 0.05\%\ $X_{0}$ for each of the reference stations and 0.3\%\ $X_{0}$ for the DUT. +The DUT station corresponds to one fourth of a first MVD station covering an area of up to $\sim$\ 8\ cm$^{2}$. + +\section{Results} +A diversity of measurements at different discriminating thresholds, inclination angles and temperatures were carried out. +% to determine the performance of the MVD prototype. +In total 1.2\ TB significant data was recorded. +The data was analyzed by an internal custom software, which was developed following the development process of the MVD prototype. +The software performs data consistency checks, unpacking and the high level analysis including quick overview functions and alignment. + +In fig. \ref{fig:ShiftSpillTime} and \ref{fig:EffVsFakes} the excellent performance of the MVD prototype should be pointed out. +Fig. \ref{fig:ShiftSpillTime} shows the temporal course of the alignment of the DUT relative to the reference system. +A changing of $0.003\ \mu m/s$ could be resolved. +The single point resolution of the DUT including the resolution of the sensor and the positional stability of the mechanics was found to be about $3.6\ \mu m$. +This is equivalent to the resolution of the sensor only. +Fig. \ref{fig:EffVsFakes} shows the efficiency-fake hit properties of the two DUT sensors. +%For the experiment it is necessary to reduce the number of noisy pixels to a minimum at maximum efficiency in order to reduce the data throughput and ambiguities in the tracking. +In the figure the two approaches masking of noisy pixels and increasing the threshold are confronted. +The sensors allow to operate at the desired operating point of above $99\%$ efficiency and below $10^{-5}$ hits per pixel and event fake rate. +For simplicity reasons only the matrix 1 of both sensors is shown. + +\begin{figure}[h] + \centering + \includegraphics[width=0.335\textwidth]{ShiftSpillTime1.pdf} + \caption{Changing of the translational alignment during one run. Each data point corresponds to one spill.} + \label{fig:ShiftSpillTime} +\end{figure} + + +%\begin{figure}[h] +% \centering +% \includegraphics[width=0.5\textwidth]{DUTres.pdf} +% \caption{ Residuals in x and y direction of the two DUT stations referencing each other. (120\,GeV pions, RUN043)} +% \label{fig:DUTres} +%\end{figure} + +\begin{figure}[h] + \centering + \includegraphics[width=0.335\textwidth]{EffVsFakes.pdf} + \caption{Efficiency as a function of the fake hit rate for two different DUT sensors. + %Solid: different threshold settings; dashed: masking of noisy pixels for one threshold setting + } + \label{fig:EffVsFakes} +\end{figure} + + +\begin{thebibliography}{9} % Use for 1-9 references +%\begin{thebibliography}{99} % Use for 10-99 references + +\bibitem{BM} +B. Milanovic: ``Beamtime Results of the MVD Prototype DAQ Network'', GSI Scientific Report 2012 +\bibitem{BM2} +B. Milanovic: ``...'', this report +\bibitem{TT} +T. Tischler: ``...'', this report + +\end{thebibliography} + + + + + +\end{document}