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000361551 005__ 20250827142849.0
000361551 0247_ $$2doi$$a10.15496/PUBLIKATION-104689
000361551 0247_ $$2URN$$aurn:nbn:de:bsz:21-dspace-1633592
000361551 037__ $$aGSI-2025-00978
000361551 041__ $$aeng
000361551 1001_ $$0P:(DE-Ds200)OR8619$$aMehta, Shaifali$$b0$$eCorresponding author$$gfemale$$ugsi
000361551 245__ $$aInvestigation of thermal and structural integrity of modules and ladders of Silicon Tracking System of the CBM experiment
000361551 260__ $$aTübingen$$bUniversität Tübingen$$c2025
000361551 300__ $$a171 p.
000361551 3367_ $$2DataCite$$aOutput Types/Dissertation
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000361551 3367_ $$02$$2EndNote$$aThesis
000361551 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1756130586_820122
000361551 3367_ $$2DRIVER$$adoctoralThesis
000361551 502__ $$aDissertation, Eberhard Karls Universität Tübingen, 2024$$bDissertation$$cEberhard Karls Universität Tübingen$$d2024$$o2024-12-16
000361551 520__ $$aThe Compressed Baryonic Matter (CBM) at the Facility for Antiproton and Ion Research (FAIR) is a fixed target experiment designed to investigate the properties of strongly interacting matter in the region of high net-baryon density. The Silicon Tracking System (STS) is the core detector of the CBM experiment and aims to track and measure the momentum of the charged particles. The STS detector comprises of 876 double sided silicon micro-strip sensors connected via micro cables to the Front-End Boards (FEBs) which are kept outside the detector acceptance of 2.5° to 25°. These sensors are mounted on 106 carbon fiber ladders which includes standard ladders and central ladders with an opening for the beam-pipe. For good particle tracking accuracy in the CBM, the silicon sensors must be mounted on the ladders with extremely high precision, minimizing misalignment and optimizing the spatial resolution of the detector. The experimental operating conditions of STS present challenges to the electronics due to a highly variable thermal environment. A significant portion of the thesis focuses on the thermal studies of the STS components. This involves a detailed investigation of the requirements for thermal interface materials (TIMs) between the FEBs and the cooling shelves. The study includes optimization techniques for adhesive application and thermal testing to ensure the effectiveness of the TIMs. To ensure the reliable functioning of FEBs under significant temperature variations, thermal cycling tests were conducted, and potential failure scenarios have been analyzed. The main focus of the thesis is the understanding of the structural integrity of the STS detector. It is investigated how the STS ladders, essential for supporting the silicon sensors, are put together and how they perform. The design and quality assurance processes for carbon fiber ladders are examined, followed by a step-by-step description of the ladder assembly procedure. The evolution of the ladder assembly procedures, from initial prototypes to fully functional ladders with the required mounting precision are highlighted. The developed procedure is designed to be iterative and easily adaptable for producing 106 STS ladders. The final section of the thesis addresses the vibration challenges encountered by the STS ladders due to air cooling, which is essential for maintaining the sensor performance. It describes the experimental setups used to measure the eigenfrequencies and vibrations on the sensor surface under airflow conditions. The study uses a perforated tube to direct airflow onto the sensor surfaces and highlights the performance differences between the standard and central ladders. Through the analysis of vibration magnitude, the impact of airflow on the stability of the silicon sensors once they are mounted on the ladders, is evaluated. These findings underline the significance of effective vibration control to maintain sensor stability. This thesis provides a comprehensive understanding of both thermal management and structural integrity of the STS. Through extensive testing of TIM and thermal cycling of the FEBs, the last step of the module assembly process has been optimized, resulting in a reliable TIM now used in the series production of the modules. Along this work, significant progress has been made in developing the ladder assembly procedure, which is now being implemented for all the ladders, with series production already underway. The central ladder assembly procedure has been optimized and validated with a prototype ladder. The vibration measurements have established the boundary conditions for airflow through the perforated tube, ensuring the mechanical integrity and necessary cooling to prevent thermal runaway.
000361551 536__ $$0G:(DE-HGF)POF4-612$$a612 - Cosmic Matter in the Laboratory (POF4-612)$$cPOF4-612$$fPOF IV$$x0
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000361551 693__ $$0EXP:(DE-Ds200)FAIR-Facility$$1EXP:(DE-Ds200)FAIR-Facility$$a
FAIR Facility 
$$x0
000361551 7001_ $$0P:(DE-Ds200)OR1124$$aSchmidt, Hans-Rudolf$$b1$$eThesis advisor$$ugsi
000361551 773__ $$a10.15496/PUBLIKATION-104689
000361551 909CO $$ooai:repository.gsi.de:361551$$pVDB
000361551 9101_ $$0I:(DE-Ds200)20121206GSI$$6P:(DE-Ds200)OR8619$$aGSI Helmholtzzentrum für Schwerionenforschung GmbH$$b0$$kGSI
000361551 9101_ $$0I:(DE-Ds200)20121206GSI$$6P:(DE-Ds200)OR1124$$aGSI Helmholtzzentrum für Schwerionenforschung GmbH$$b1$$kGSI
000361551 9131_ $$0G:(DE-HGF)POF4-612$$1G:(DE-HGF)POF4-610$$2G:(DE-HGF)POF4-600$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Materie$$lMatter and the Universe$$vCosmic Matter in the Laboratory$$x0
000361551 920__ $$lyes
000361551 9201_ $$0I:(DE-Ds200)Coll-FAIR-CBM$$kCBM@FAIR$$lCollaboration FAIR: CBM$$x0
000361551 980__ $$aphd
000361551 980__ $$aVDB
000361551 980__ $$aI:(DE-Ds200)Coll-FAIR-CBM
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