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RPC Configuration D ata B ase

RPC Configuration D ata B ase. Pierluigi Paolucci - I.N.F.N. of Naples. HV system  ~ 48 0 channels config. param. = 8 cond. param. = 11 LV system  ~ 75 0 channels config. param. = 8 cond. param. = 11 Temperature  ~ 300 channels

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RPC Configuration D ata B ase

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  1. RPC Configuration DataBase Pierluigi Paolucci - I.N.F.N. of Naples

  2. HV system  ~480 channels config. param. = 8 cond. param. = 11 LV system  ~750 channels config. param. = 8 cond. param. = 11 Temperature  ~ 300 channels Front End  ~4680 Front-End Boards config. param. = Threshold & Width cond. param. = Rate/Occupancy histograms RPC Barrel I.N.F.N. Naples Pigi Paolucci, I.N.F.N. of Naples

  3. Barrel FEBis equipped with 2 front-end chips (8 strips each) and 1 temperature sensor.For each chip there are: 2 threshold value (hardware defaults of 200 mV); 2 width values (hardware defaults of 100 ns); 1 temperature value. How many operations/bytes do we need to read/write this parameters ?? Read width/thresh.  2 write + 1 read  5 bytes Read temperature  2 write + 1 read  5 bytes Write width/thresh.  3 write  6 bytes TOTAL number of FEB parametersare 9.360 Threshold + 9.360 width + 4.680 temp. Front-End Board Data I.N.F.N. Naples Pigi Paolucci, I.N.F.N. of Naples

  4. Barrel RPC detector is equipped with480 HVchannels and with780 LVchannels. To configure the detector we need to set: Vset, Vmax, Iset, Imax, Trip, Rup, Rdown, On/Off. HV & LV configuration requires about 1260 ch * 8 par. = 10.080 par * 2 bytes = 20 KB FEB configuration requires about 3.4 Kbytes per Link Board corresponding to 2 MB. RPC Barrel configuration Data I.N.F.N. Naples Pigi Paolucci, I.N.F.N. of Naples

  5. The RPC detector will have 4 different states (run, calibration, “injection/safe” and off); RUN  LVON && HVON (status = = 4 @ working voltage) && FEBThresholdLoaded && NoiseRateOK SAFE  HVON (status = = 4 @ safe voltage) CALIBRATION  LVON && FEBThresholdLoaded && NoiseRateOK && HVON @ different voltages. “Plateau calibration” needs5-7 runs with different configuration parameters (HV set-points) when the others muon systems are working/triggering in “normal mode”. RPC must be in local mode and the RPC Local DAQ will take data. Offline monitoring to calculate the efficiency curves. Noise calibration runs needs few runs with different FEB thresholds but fixed HV set-points. RPC configuration states I.N.F.N. Naples Pigi Paolucci, I.N.F.N. of Naples

  6. RPC/FEB monitoring requires about 100 Bytes/s per Link Board corresponding to 60 KB/s in the barrel. FEB configurationrequires about 3.4 Kbytes/s per Link Board corresponding to 2 MB/s in the barrel. Front End Board Summary I.N.F.N. Naples Pigi Paolucci, I.N.F.N. of Naples

  7. Additionally for the orbit synchronization there are ca. 4000 32-bit counters (1 for each bunch crossing) producing ca. 128 Kb of data / plot. But these probably can be read less often. The theoretical throughput of a CCU chain (up to 27 CBs) is 4 MB/s. The theoretical throughput of a LB box is 4 MB/s / 27 = 152 KB/s. The theoretical throughput of a Link Board is 152 KB/s / 8 = 19 KB/s. Required throughput for a continuous monitoring of one RPC is: 128 strips * 2 counters * 32 bits = 8 Kbits/10s = 100 Bytes/s. The I2C communication does not contribute significantly to the total CCU load. The total bandwidth depends on the number of CB's in single CCU chain (serviced by a single FEC). Front End Board Data III I.N.F.N. Naples Pigi Paolucci, I.N.F.N. of Naples

  8. The front end electronic boards communicate with the Link Board through the I2C bus; Each Slave LB receives data from up to 6 FEBs  96 strips; Each Master LB is connected to not more than 2 SLB; MLB transmits data to the control room via optical fiber; Each LB crate house up to 8 LBs and has 1 Control Board (CCU); The RPC continuous monitoring (noise rate, occupancy…) will have a refresh rate of 10 sec; For each strip the events before and after windowing are counted during a defined period of time. That allows plotting of rates and efficiency; There are two 32-bit counters for each group of 128 channels/strips; The amount of data to be sent is 2*32*128 = 8 Kb/10s/LB/plot. Front End Board Data II I.N.F.N. Naples Pigi Paolucci, I.N.F.N. of Naples

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