Integration of the Complete System

The detector and the supply tubes were assembled and commissioned at PSI within only two months in May and June 2008. 

The detector halves together with the supply tubes were integrated in two 5 m long transport boxes custom-built for the installation into CMS. Within the transport box the detector is placed on wheels on a rail system which then can be used to slide the pixel detector inside CMS. A picture of the pixel detector with the two supply tubes inside the transport box can be seen in Fig.8.13. 

The connection between the readout sectors of the supply tube and the detector endflange is provided by four Kapton signal cables and a power cable. An aluminum clamp screwed to the detector endflange retains the Kapton cables in their position. The mechanical strength of the connection between the detector and the supply tube is determined by the stiffness of the signal and power cables. 

In addition to the signal and power cables, silicon rubber hoses fixed with aluminum clips were mounted to connect the aluminum cooling lines of the detector mechanics and of the supply tubes. A leak test of the 10 cooling lines of each half detector was performed by filling the lines and monitoring the amount of coolant. No leaks were detected inside the pixel system. 

After the assembly, the complete system was fully commissioned by performing the low level hardware tests followed by detailed functionality tests. The low level hardware tests were carried out using the standalone software and could be completed within less than one day while the detailed performance tests took about 3 h per sector. 

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Integration of the complete system on a mobile rack allows short set-up time and easy installation of the system at different sites. On the other hand, the chosen approach leads to a very bulky system and to a very high grade of automation (Cleary et al. 2006). 

The contributions to the construction and commissioning of the CMS pixel barrel detector made during this thesis were presented in this chapter. The construction of the BPIX detector included the mounting of the modules on the mechanical cooling structure, the assembly of the supply tube and the integration of the complete system. 

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