changes suggested by Christian

diff --git a/GSI_2015_Linnik/Jahresbericht2014_Linnik-FSBB-GSIbericht2014.pdf b/GSI_2015_Linnik/Jahresbericht2014_Linnik-FSBB-GSIbericht2014.pdf
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Binary files a/GSI_2015_Linnik/Jahresbericht2014_Linnik-FSBB-GSIbericht2014.pdf and b/GSI_2015_Linnik/Jahresbericht2014_Linnik-FSBB-GSIbericht2014.pdf differ

diff --git a/GSI_2015_Linnik/Jahresbericht2014_Linnik-FSBB-GSIbericht2014.ps b/GSI_2015_Linnik/Jahresbericht2014_Linnik-FSBB-GSIbericht2014.ps
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 b(Pri)-25 b(v)g(ate)250 b(communication.)p eop end
 %%Trailer
 

diff --git a/GSI_2015_Linnik/Jahresbericht2014_Linnik-FSBB-GSIbericht2014.tex b/GSI_2015_Linnik/Jahresbericht2014_Linnik-FSBB-GSIbericht2014.tex
index 4a3c78a70524de5ea9500b348f8d0002dbc6bffa..08c91c86aebca440f2b614d23a58bb7ffe9128f3 100644 (file)
--- a/GSI_2015_Linnik/Jahresbericht2014_Linnik-FSBB-GSIbericht2014.tex
+++ b/GSI_2015_Linnik/Jahresbericht2014_Linnik-FSBB-GSIbericht2014.tex
@@ -19,7 +19,7 @@
 %\setlength{\titleblockheight}{33mm}
 \begin{document}
 \title{Yield studies on a fully integrated sensor for the CBM-MVD\thanks{This work has been supported by BMBF (05P12RFFC7), HIC for FAIR, HGS-HIRe and GSI.}}
-\author[1,2]{B. Linnik}
+\author[1]{B. Linnik}
 \author[1]{D. Doering}
 \author[1]{M. Deveaux}
 \author[ ]{J. Stroth\textsuperscript{\normalfont 1,3} for the CBM-MVD collaboration}%\author{for the CBM-MVD collaboration}
@@ -33,20 +33,20 @@
 \maketitle
 %\section{Introduction}
 The CBM-experiment will study the phase diagram of hadronic matter in the region of highest baryon densities by means of rare probes like open charm particles. Reconstructing those particles calls for a vertex detector providing a unique combination of excellent spatial resolution, light material budget and high rate capability. To match those requirements, we intend to use CMOS Monolithic Active Pixel Sensors, which are developed by the PICSEL group of IPHC Strasbourg and eveluated at the IKF Frankfurt within an common R\&D project. \newline
-A first fully integrated sensor, MIMOSA-28, was developed in the AMS $0.35\ \upmu \rm m$ CMOS process and it is used for data taking in the STAR-HFT since 2014. However, this sensor does not match the requirements of CBM regarding radiation tolerance and readout speed. Therefore, the sensor architecture was migrated to a novel $0.18\mum$ process. This process was found to provide a higher tolerance to ionizing radiation \cite{IWORID2013}. Moreover, its higher packing density allows for reading two lines in parallel, which accelerates the readout by a factor of two with respect to the elder design. \newline
+A first fully integrated sensor, MIMOSA-28, was developed in the AMS $0.35\ \upmu \rm m$ CMOS process and it is used in the STAR-HFT since 2014. However, this sensor does not match the requirements of CBM regarding radiation tolerance and readout speed. Therefore, the sensor architecture was migrated to a novel $0.18\mum$ process. This process was found to provide a higher tolerance to ionizing radiation \cite{IWORID2013}. Moreover, its higher packing density allows for reading two lines in parallel, which accelerates the readout by a factor of two with respect to the elder design. \newline
 In 2014, a first fully integrated prototype sensor (FSBB-M0) was realized in the new process \cite{StrasbourgPaper2014Mistral}. The sensor was realized in two flavors (FSBB-M0a and FSBB-M0b), which differ slightly in the dimensions of some transistors. It features $416 \times 416$ pixels of $22 \times 33 \mum^2$ pitch and it is read out within $40 \mus$ via a pair of discriminators at the end of each column. Hereafter, the digital data is zero-suppressed and sent out via two 320 Mbps digital links. The sensitive surface of the FSBB is  $13.7\times9.2 ~\rm mm^2$. The final sensor of the CBM-MVD will presumably consist of three FSBBs.
 \begin{figure}[htb]
 %\centering
 \hspace*{-0.75cm}
 \includegraphics[width=0.6\textwidth]{TN-FPN}
 \vspace*{-0.75cm}
-\caption{Temporal noise and fixed pattern noise measurement of a subset of 17 similar chips.}
+\caption{Temporal noise and fixed pattern noise measurement of all 17 FSBB-M0a chips.}
 \label{fig:figure1}
 \end{figure}
-The FSBB-M0 was tested at the CERN-SPS and provided a detection efficiency for minimum ionizing particles of $\gtrsim 99,5\%$, a dark rate of $\lesssim 10^{-5}$ and a spatial resolution of $<5 \mum$ in both dimensions \cite{MarcPersonalCommunication}, which matches the requirements of CBM. \newline
-To test the robustness of the design and to estimate the production costs for the CBM-MVD, we measured the production yield of the FSBB. In accordance with our experience, we assumed that production mistakes would turn into a significant deterioration of the noise of the sensors. To spot such deteriorations, a total of 25 (17 FSBB-M0a and 8 FSBB-M0b) sensors was bonded on PCB and operated with a suited readout system. The temporal noise (TN) of the individual pixels was derived by means of a threshold scan. Moreover, we measured the fixed pattern noise (FPN), which is caused by the offset of the dark signal of the pixels. \newline
-The results of the study on the FSBB-M0a is shown in figure~\ref{fig:figure1}. We found all sensors tested to be operational and they provided a $\rm TN=(0.70\pm 0.05) ~\rm mV$ and $\rm FPN=(0.73\pm 0.14) ~\rm mV$. Only one of the tested sensors showed a higher FPN of $\sim 1.2~\rm mV$, which might still be acceptable. Similarly good results were observed with the eight FSBB-M0b tested, which all found operational (not shown).\newline
-We conclude that a first full size sensor meets the requirements of CBM regarding surface, data rate and spatial resolution. Moreover, the design mostly reaches out specification in terms of readout speed. Measurements demonstrated the sensor provide good performances for minimum ionizing particle detection and the production yield was found to exceed 95\%.
+The FSBB-M0 was tested at the CERN-SPS and provided a detection efficiency for minimum ionizing particles of $\gtrsim 99,5\%$, a noise occupancy of $\lesssim 10^{-5}$ and a spatial resolution of $<5 \mum$ in both dimensions \cite{MarcPersonalCommunication}, which matches the requirements of CBM. \newline
+To test the robustness of the design and to assess the the production costs for the CBM-MVD, we measured the production yield of the FSBB. In accordance with our experience, we assumed that flows due to production mistakes would turn into a measurable deterioration of the noise of the sensors. A total of 25 (17 FSBB-M0a and 8 FSBB-M0b) sensors was bonded on PCB and operated with a suited readout system. By measuring the transfer functions we reveal the temporal noise (TN) of the individual pixels and the fixed pattern noise (FPN), which is caused by the offset of the dark signal of the pixels. \newline
+The results of the study on the FSBB-M0a are shown in Fig{.}~\ref{fig:figure1}. We found all sensors tested to be operational and they provided a $\rm TN=(0.70\pm 0.05) ~\rm mV$ and $\rm FPN=(0.73\pm 0.14) ~\rm mV$. Only one of the tested sensors showed a higher FPN of $\sim 1.2~\rm mV$, which might still be acceptable. Similarly good results were observed with the eight FSBB-M0b tested, which all found being operational (not shown).\newline
+We conclude that a first full size sensor meets the requirements of CBM with respect to surface, data rate and spatial resolution. Moreover, the design mostly reaches out the specification in terms of readout speed. Measurements demonstrated that the sensor provides a good detection of minimum ionizing particles and the production yield was found to exceed 95\%.
 
  
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