The FEE Server Control Engine of the ALICE-TRD - Westfälische ...

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ADC value / scaled IR temperature (a.u.) 140 120 100 80 60 40 20 0 6 Temperature Monitoring of the Front End Readout Electronics 0 10 20 30 40 50 60 time (min) Figure 6.13: The red curve shows the averaged MCM temperature sensor readings of a complete chamber. The corresponding error bars are plotted in orange. Before averaging the first value of all MCMs were set to zero and and only the differences between the first value and the current value of each MCM were averaged. The gray curves are the MCM temperature sensor readings of the MCMs with the highest and lowest changes. The black, blue and red lines / points are the scaled surface temperatures showed in plot 6.11. MCM curve fit parameter value (°C) uncertainty (°C) high a 6.9 ±0.51 high b -196 ±19 averaged a 7.5 ±0.45 averaged b -207 ±17 low a 5.9 ±1.2 low b -173 ±45 90 Table 6.2: IR temperature scaling factors
7 Summary The ALICE detector. The ALICE experiment at the Large Hadron Collider at CERN is a dedicated experiment to study the properties of the QGP created in heavy ion collisions. The TRD is one of the detectors in ALICE. Its main tasks are to work as a fast tracker and to provide electronpion separation at momenta in excess of 1 GeV/c. The TRD has complex front end readout electronics directly embedded in the detector. The electronics needs to be configured and monitored. One part of the front end readout electronics are the DCS boards, small embedded computers running a Linux operation system. On the Linux system runs the FEEServer and the control engine which control and configure the TRD. In this thesis the control engine for the transition radiation detector of the ALICE experiment was redesigned and implemented in C++. The original version was written in C and had both a lack of extensibility and features. Therefore the source code was completely rewritten. A finite state machine and a consistent reporting and error handling system were added. The handling of incoming configurations and the hardware test procedures were improved. Furthermore, the complete SCSN system was rewritten to add the ability to bridge linkpairs and to handle bridged linkpairs. Finally, a class to read out the internal temperature sensors of the MCMs was added. On the basis of the MCM temperature readout a procedure was developed to identify badly cooled MCMs and blocked cooling lines during supermodule assembly. The identification during the assembly is vital because afterwards it is difficult if not even impossible to fix cooling problems inside a supermodule. 91
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Temperature (MeV) 225 200 175 150 1
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4.1.2 Readout Chamber Design 108.16
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