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

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4 The ALICE Transition Radiation Detector crates outside the L3 magnet of ALICE. The crates are connected with PCs which can control each channel separately. The HV modules and the supermodules are connected with HV multiconductor cables. One cable connects one HV module with the corresponding connection on one supermodule. Each HV multiconductor cable has 37 leads. 30 leads are used for the HV supply and the other leads are used as current return lines. Inside the supermodule the HV is distributed to the chambers via individual high-voltage cables. Gas Supply The TRD needs a mixture of xenon and carbon dioxide for operation. The gas system of the TRD is a closed loop system because of the high price of xenon. One challenge during the design of the gas system was that xenon is a heavy gas and just the height difference of 7 m between the lowest and the heighest readout chamber in the TRD results in a pressure difference of 2.5 mbar. But the overpressure in the chambers has to be limited to be below 1 mbar to avoid damage. To solve this problem, the gas system is segmented in 14 height sections. Gas pipes are used between the gas distribution modules – located halfway between the TRD 100 m below ground and the surface – and the detector to provide a constant gas flow to all supermodules [Lip06]. Each supermodule has three gas inlets in stack 0 of layers 0, 2, and 4. The gas flows through the layer until it reaches the end of the chambers in stack 4. There it is redirected to the next upper layer and flows back to the chamber in stack 0. Therefore the gas outlets are at stack 0 of the layers 1, 3, and 5. There the gas is collected and sent to the gas recovery. The gas recovery first separates the CO2 with membranes. Afterwards oxygen is removed and then the xenon gas is recovered in a cryogenic xenon recovery plant [Lip06]. The gas quality is monitored by the GOOFIE system [DA07]. The GOOFIE system measures permanently the drift velocity and the gas gain. Based on these measurements different gas parameters can be monitored, including the actual level of nitrogen contamination. These information are important parameters for the analysis of the data recorded by the TRD. 4.3 Front End Readout Electronics of the TRD The front end readout electronics (FERO) of the TRD includes all electronics which is mounted on the top of the readout chambers. The main components are the multi-chipmodules (MCMs) which read out the cathode pads, digitize and preprocess the data, the optical readout interface cards (ORIs) which send the data from the readout chambers to the trigger and the data acquisition system and the detector control system boards (DCS boards) which configure and control the MCMs, the ORIs and the readout boards. This section gives an overview of the used hardware and the communication networks in the FERO whereas the next chapter describes the control software used to operate the FERO. 30
4 The ALICE Transition Radiation Detector Figure 4.6: Overview of a readout chamber installed in the supermodule. The power bus bars provides the low voltage for the electronics and the cooling keeps the electronics within their safe operating temperatures. T4A T3A T1A T1A ROB 6 ROB 7 ORI ROB 4 ROB 5 ROB 2 ROB 3 ORI DCS ROB 0 ROB 1 T4B T3B T2B T1B Figure 4.7: The two chamber types used in the TRD and the position of the different readout boards. Each readout board has at least 17 MCMs soldered on top but only the T2B type has a connector for a DCS board and only the two T3 types have a connector for ORI cards (drawing based on [RS06]). C0 chambers C1 chambers 31
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magnitude magnitude magnitude 0 -10
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A Using the libTRD The C++ library
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B The SCSN Commands and Extended SC
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B The SCSN Commands and Extended SC
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Block Class task Configuration hand
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Bibliography [A + 05] V. Angelov et
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Bibliography [Mah04] T. Mahmoud. De
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