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

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MCM row 7 6 5 4 3 2 1 0 18 17 9 12 11 15 16 20 27 17 13 13 6 Temperature Monitoring of the Front End Readout Electronics 30 22 15 12 14 13 14 14 16 17 19 24 16 13 13 15 14 21 23 42 18 18 17 18 17 15 15 21 18 19 27 19 19 22 24 21 22 21 22 26 17 13 16 19 15 34 32 16 17 14 15 12 13 21 19 20 20 17 16 19 18 19 14 24 22 26 22 16 23 22 22 24 18 21 26 25 23 32 19 17 16 20 26 24 14 20 18 27 18 21 22 12 15 21 15 19 26 20 20 20 70 61 23 23 23 24 26 22 22 19 17 17 12 17 20 19 23 18 17 17 25 22 14 26 27 21 26 15 23 18 24 28 41 35 20 22 17 21 17 17 15 19 15 14 24 20 18 19 18 17 25 26 24 20 20 21 19 20 18 27 26 22 26 18 19 20 10 13 13 16 20 18 17 18 19 16 20 20 24 20 24 25 23 21 20 18 16 14 15 21 25 14 19 23 25 20 19 24 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 MCM column 21 25 19 24 17 18 17 19 28 17 20 20 20 17 13 20 28 24 18 23 22 19 16 18 20 16 19 18 19 22 17 25 21 24 27 23 26 23 22 24 20 25 23 27 24 16 21 20 15 17 18 19 14 18 22 27 23 17 32 29 38 36 24 20 37 43 28 23 20 27 19 19 18 19 Figure 6.8: Cooling overview of a complete layer with active cooling. One can see that some MCMs have a worse cooling than other MCMs. This is caused by a bad thermal coupling between the MCMs and the cooling plates glued on top. As long as only a few MCMs are affected no further action is required since the MCMs get sufficiently cooled by the thermal coupling between the MCM and the readout board and by air cooling. The readout chamber in the last stack (MCM column 60 – 75) was switched off. The MCMs without a score value in the other stacks had a non-working temperature sensor during this measurement and were automatically excluded. Figure 6.9 shows a second measurement of the same layer. MCM row 7 6 5 4 3 2 1 0 13 13 11 14 11 14 13 18 15 11 13 12 20 17 15 15 9 12 13 12 15 12 16 17 22 16 16 15 17 14 13 14 15 13 17 18 19 18 18 18 17 21 26 17 18 18 17 18 16 73 15 63 13 14 14 16 59 23 81 16 15 15 65 13 15 16 14 14 16 13 22 20 22 14 16 20 22 24 15 15 15 17 16 14 13 17 65 18 19 15 18 13 18 21 13 12 19 21 17 18 16 20 16 18 19 21 18 16 51 16 17 16 18 24 19 20 20 20 20 19 18 16 16 18 11 12 15 15 17 16 17 16 16 19 23 24 23 19 18 17 18 17 19 20 12 15 14 17 15 20 18 16 19 20 19 21 18 16 17 18 15 17 18 17 17 16 18 17 19 18 18 16 12 17 16 20 21 17 15 15 17 19 20 11 15 13 13 16 19 18 16 16 19 19 18 17 18 33 32 33 27 25 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 MCM column 20 25 21 19 19 21 19 18 20 19 14 14 13 20 18 21 18 17 17 16 18 20 18 19 15 20 17 14 22 19 12 19 17 16 15 14 9 17 18 21 18 20 33 16 22 20 14 18 17 14 20 16 16 21 16 20 20 22 22 23 19 17 15 16 16 18 24 20 15 24 22 17 18 18 19 21 21 17 18 20 18 13 14 12 18 13 12 12 17 20 16 22 23 19 18 29 21 23 19 15 27 21 20 18 23 29 21 25 25 26 19 21 17 23 36 31 58 22 19 15 17 18 16 16 18 19 19 17 17 18 13 18 19 11 13 15 18 18 17 20 12 16 15 17 19 26 22 19 16 15 14 15 20 20 18 16 21 23 23 13 19 20 19 24 23 21 21 40 16 20 19 25 26 27 22 37 17 24 23 20 22 21 18 17 Figure 6.9: Cooling overview of a complete layer with active cooling. The cooling line for the MCMs in column 11 was blocked manually. The affected MCMs are clearly identifiable as uncooled. If such an observation is done after the installation of a layer the problem has to be fixed. Figure 6.8 shows a different plot of the same layer. 86 22 20 24 20 17 19 20 22 18 22 15 17 17 17 20 23 24 27 25 20 21 28 19 24 16 19 26 22 22 27 24 19 18 17 15 18 17 16 20 20 19 21 20 20 18 33 17 22 20 20 26 23 17 27 29 60 50 40 30 20 10 0 60 50 40 30 20 10 0
6 Temperature Monitoring of the Front End Readout Electronics • layer−>loadLayer("dir", layer): Load all files from layer layer in directory dir. • layer−>drawLayer(): Draws a cooling overview for a complete layer. Two plots created with this command are shown in figures 6.8 and 6.9. • layer−>drawRoc(stack): Draws a cooling overview for one stack. • layer−>drawCol(col): Draws the temperature sensor readings as function of time for all MCMs in one cooling line (one curve per MCM). • layer−>reset(): Reset all information. Necessary to switch to another layer. 6.2.3 Calibration of the MCM Temperature Sensors counts 6 4 2 0 250 300 350 400 450 500 ADC value (a.u.) counts 10 8 6 4 2 0 0 20 40 60 80 100 ADC value difference (a.u.) Figure 6.10: Distribution of the absolute MCM temperature sensor readings at a given point in time (left) and the distribution of the differences of the MCM temperature sensor readings measured at two points in time. The MCM temperature sensors are not calibrated. Figure 6.10 shows the absolute ADC values within one chamber just after switching on the MCMs. In this case one can assume all MCMs have the same temperature and therefore all sensors should report the same value. In contrast to expectation the plot shows a broad distribution of the ADC values. In the second plot of figure 6.10 the difference between the ADC value at two points in time of an uncooled readout chamber is shown. Because the chamber is uncooled one can assume that the temperature difference for all MCMs is the same. Calibrated sensors should give all the same value which corresponds to the temperature change between the two points in time but the plot shows a broad distribution of the values. The plots in figure 6.10 illustrate that for calibration at least two calibration factors are required: temperature in °C = a · ADC value + b (6.4) with a = T1 − T2 ADC1 − ADC2 and b = T1 − a1 · ADC1 (6.5) Therefore two ADC temperature values (ADC1, ADC2) and the corresponding temperatures (T1, T2) are required for a calibration. The main challenge is to determine T1 and T2. The temperature inside the chip cannot be measured. Instead one can use the surface temperature of the MCMs. Using the surface temperature has the disadvantage that the 87
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1 Introduction The standard model o
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Temperature (MeV) 225 200 175 150 1
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