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Test setup Trigger Data acquisition Data taking On-line First level diagnosis Off-line analysis

BIL tests in Roma Tre: the first 10% Toni Baroncelli, Paolo Branchini, Ilaria Di Sarcina, Mauro Iodice, Domizia Orestano, Antonio Passeri, Fernanda Pastore, Fabrizio Petrucci, Eleuterio Spiriti, Alessandra Tonazzo Dipartimento di Fisica & INFN - Roma Tre. Test setup Trigger Data acquisition

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Test setup Trigger Data acquisition Data taking On-line First level diagnosis Off-line analysis

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  1. BIL tests in Roma Tre:the first 10%Toni Baroncelli, Paolo Branchini, Ilaria Di Sarcina, Mauro Iodice, Domizia Orestano, Antonio Passeri, Fernanda Pastore, Fabrizio Petrucci, Eleuterio Spiriti, Alessandra TonazzoDipartimento di Fisica & INFN - Roma Tre • Test setup • Trigger • Data acquisition • Data taking • On-line • First level diagnosis • Off-line analysis • Second level diagnosis and more refined checks Experience with the first 8 BIL chambers F.Ceradini - BIL tests in Roma Tre: the first 10%

  2. BIL Two multilayers, each with 36 x 4 tubes Tubes closed, wired and tested in Cosenza Tube quality measurements and chamber assembly in Roma La Sapienza Each bare chamber positioned in its frame and transported to Roma Tre then • check for missing wires by ohmic contact • fix ground plates • measure end-plug planarity • install gas jumpers • connect gas bars • test for gas leaks takes very long when OK then F.Ceradini - BIL tests in Roma Tre: the first 10%

  3. three gas volumes exchange • install HV and signal hedgehog boards • connect HV • test for power ON • install Faraday cage • install mezzanine boards • cable mezzanine boards no DCS controls, just write on logbook: SHOULD IMPROVE for control of temperature, gas mixture, pressure and flow; no RASNIK nor other sensors • start test at least half a day F.Ceradini - BIL tests in Roma Tre: the first 10%

  4. Experimental layout F.Ceradini - BIL tests in Roma Tre: the first 10%

  5. Data acquisition data acquisition software is platform independent, in Rome it runs on • Dec Unix platform AXPVME 233. • LynxOs platform RIO II. and has been inserted in DAQ-1 (Enrico Pasqualucci) some details…. • the software is written in such a way that VME address and data cycles are done using a dedicated VME library originally developed for the KLOE experiment • it should be easy to use the very same software with a different platform once one has the VME access library for that platform. F.Ceradini - BIL tests in Roma Tre: the first 10%

  6. Software the software has been developed in ansi C and it is organized in libraries the CSM library uses all the other libraries to access the CSM, delivers the Jtag bit string to the CSM, provides the basic function to read it back and decode together with this set of libraries several example programs have also been written to test and debug the hardware the programs work also with the new mezzanine boards (AMT2) and the old adapter and CSM0. when setting up the MDT read out: we have found very useful the program which sets the JTAG programming string and reads it back to check that initialization was successful F.Ceradini - BIL tests in Roma Tre: the first 10%

  7. For a test at CERN, where do we start from ? • noise measurement with HV OFF – zero time • fixing noisy channels might take time • turn HV ON in steps and keep it at 3400 V, check currents – very little time • noise measurement with HV ON – zero time • take data with cosmic rays: at least 20000 events per tube – with our 20 Hz trigger rate it's one night F.Ceradini - BIL tests in Roma Tre: the first 10%

  8. Some sources of trouble • bad grounding between hedgehog and ground plate • identify the channel, dismount the hedgehog(s), tighten screws and pins, mount it back • noisy capacitor (less common, it occurred twice) • same operation as before but improving ground doesn’t help, then change the signal hedgehog • connections of mezzanine to adapter • a clean cabling helps in all cases a minimal data taking is necessary and a clever and reliable debugging program is needed F.Ceradini - BIL tests in Roma Tre: the first 10%

  9. for normal operation … it is important to define • the maximum single-channel noise • how many noisy channels per chamber • how many dead channels per chamber hunting for the ultimate bug might take too long F.Ceradini - BIL tests in Roma Tre: the first 10%

  10. On-line analysis Chamber RM007: top position Chamber RM012: central position • Check uniformity of response (panettone-like shape) • Identify missing wires and noisy channels • Fill drift time histograms F.Ceradini - BIL tests in Roma Tre: the first 10%

  11. Drift time spectra TDC counts TDC counts F.Ceradini - BIL tests in Roma Tre: the first 10%

  12. Off-line analysis: 1st level • Fit individual drift time distributions (about one hour on a 2 GHz processor) Distributions of parameters: F.Ceradini - BIL tests in Roma Tre: the first 10%

  13. Off-line analysis: 1st level • Cuts on the fit parameter values allow to identify channels with possible problems • Missing wires • High noise level • Distortions in drift time distribution: • spectrum length • spectrum shape F.Ceradini - BIL tests in Roma Tre: the first 10%

  14. Fit time spectra in the 6 x regions selected by the trigger and check uniformity over tube length (3 hours on a 2 GHz processor) Fit tracks on MultiLayer or full chamber Make autocalibration Extract r-t relations Check for internal alignment (X hours on a 2 GHz processor) Off-line analysis: 2nd level Drift spectrum length (ns) vs x region F.Ceradini - BIL tests in Roma Tre: the first 10%

  15. Off-line analysis: 2nd level F.Ceradini - BIL tests in Roma Tre: the first 10%

  16. chamber is ready to go F.Ceradini - BIL tests in Roma Tre: the first 10%

  17. BIL chambers at CERN Work in progress… F.Ceradini - BIL tests in Roma Tre: the first 10%

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