From e0ff6009d041507a98d33751f1f215e0a799238d Mon Sep 17 00:00:00 2001 From: Michal KOZIEL Date: Tue, 3 Feb 2015 21:23:14 +0100 Subject: [PATCH] update 03.03.2015 --- .../integration.tex | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/GSI_2015_MK_TT_Progress_mechanical_integration/integration.tex b/GSI_2015_MK_TT_Progress_mechanical_integration/integration.tex index bbad52f..efd5041 100644 --- a/GSI_2015_MK_TT_Progress_mechanical_integration/integration.tex +++ b/GSI_2015_MK_TT_Progress_mechanical_integration/integration.tex @@ -33,7 +33,7 @@ This report summarizes the activities undertaken towards the construction of the \textbf{Quality assurance of 50~$\upmu$m thin PRESTO sensors:$\;\;$} Thinned MIMOSA-26 sensors will be used for assembly the so called PRESTO module. PRESTO addresses the double-sided integration of $15$ MIMOSA-$26$ sensors (dummies and working sensors) onto a $8\times 8~cm^{2}$ CVD diamond support (see \cite{PRESTO} for more details). Sensors will be connected with the R/O system by means of a newly designed ultra-low material budget flex cable employing commercially available processes based on copper traces \cite{FPC}. Constructing the PRESTO allows to estimate the integration yield providing that the employed sensors are tested prior to assembly. Up to now, $18$~MIMOSA-$26$ AHR sensors thinned to 50 $\upmu$m were probe tested using the setup described in \cite{QA}. The setup allows testing the standard operation modes of the sensor as well as measure the fixed pattern and temporal noise by the means of so called s-curves. $12$ sensors were found without a significant number of dead/noisy pixels; they were qualified as fully operational. Four sensors exhibiting some dead rows/columns were marked as faulty. The two remaining sensors were not operational due to a power supply short (one sensor) and problems while powering one out of the four MIMOSA-$26$ sub-matrices. The estimated yield was then of about 65$\%$ which is in agreement with expectations for this type of sensors \cite{LG}. The temporal noise was found to be of about 1.6-1.8~mV and the fixed patter noise of about 0.5-1.0~mV. This is by factor of 2-3 higher than the noise specified by a sensor provider. This was nevertheless as expected since the sensor power signals were generated outside the probe card. The addressed probe tests allowed also to establish test procedures required for non-destructive tests of thinned CMOS sensors and can be applied for testing the final MVD sensors. \textbf{Development of a custom made glue:$\;\;$} -An "ideal" adhesive for the integration of the sensors onto their supports should be easy to dispense in a thin and uniform layer\textemdash calling for a low viscosity\textemdash, radiation hard as well as flexible (to compensate for the thermal expansion mismatches between the sensor and their support material) within the temperature range foreseen for the operation of the MVD sensors. Since there are none "on-shelf" products that meet these requirements, a custom-made, two compound adhesive with a working name RAL-$247$ was manufactured at the Rutherford Appleton Laboratory (RAL), Composites and Materials Testing Group, UK. The glue features a glass temperature of -$45~^{\circ}$C, a viscosity of below $100$ mPa$\cdot$s and a curing time of $48$ h at +$50~^{\circ}$C. To investigate its radiation hardness, RAL-$247$ samples were irradiated with X-rays to 100~Mrad and to a proton dose of about 10$^{15}$~n$_{eq}$/cm~$^{2}$. The irradiated samples were sent to RAL for further Dynamic Mechanical Analysis tests which unraveled no significant change of properties that confirms the expected radiation hardness at the range of radiation doses expected at the MVD. +An "ideal" adhesive for the integration of the sensors onto their supports should be easy to dispense in a thin and uniform layer\textemdash calling for a low viscosity\textemdash, radiation hard as well as flexible (to compensate for the thermal expansion mismatches between the sensor and their support material) within the temperature range foreseen for the operation of the MVD sensors. Since there are none "on-shelf" products that meet these requirements, a custom-made, two compound adhesive with a working name RAL-$247$ was manufactured at the Rutherford Appleton Laboratory (RAL), Composites and Materials Testing Group, UK. The glue features a glass temperature of -$45~^{\circ}$C, a viscosity of below $100$ mPa$\cdot$s and a curing time of $48$ h at +$50~^{\circ}$C. To investigate its radiation hardness, RAL-$247$ samples were irradiated with X-rays to 100~Mrad and to a proton dose of about 10$^{15}$~n$_{eq}$/cm~$^{2}$. The irradiated samples were sent to RAL for further Dynamic Mechanical Analysis tests which unraveled no significant change of properties \cite{glue} that confirms the expected radiation hardness at the range of radiation doses expected at the MVD. \textbf{Development of the heat sinks for the MVD:$\;\;$} @@ -46,6 +46,11 @@ The operation of the MVD in vacuum requires a continuous cooling of the sensors \begin{thebibliography}{9} +\bibitem{PRESTO} +M. Koziel et al., "PRESTO: PREcursor of Station TwO of the CBM-MVD." GSI annual report 2014. + +\bibitem{FPC} +P. Klaus et al., "Ultra-low material budget Cu flex cable for the CBM-MVD. "GSI annual report 2014. \bibitem{QA} M. Koziel et al., GSI annual report 2013. @@ -56,17 +61,13 @@ L. Greiner et al., CPIX 2014, Bonn, Germany \bibitem{glue} Private communication, Simon Canfer Rutherford Appleton Laboratory, Composites and Materials Testing Group, UK. +\bibitem{CVD} +Diamond Materials GmbH, Germany + \bibitem{vacuum} G. Kretzschmar et al.,"Vacuum compatibility of the CBM-MVD." GSI annual report 2014. -\bibitem{FPC} -P. Klaus et al., "Ultra-low material budget Cu flex cable for the CBM-MVD. "GSI annual report 2014. -\bibitem{CVD} -Diamond Materials GmbH, Germany - -\bibitem{PRESTO} -M. Koziel et al., "PRESTO: PREcursor of Station TwO of the CBM-MVD." GSI annual report 2014. -- 2.43.0