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Straw detector Technical run experience

Straw detector Technical run experience.

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Straw detector Technical run experience

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  1. Straw detectorTechnical run experience We have been hesitating to go to TR. It required a lot of hard work to modify and prepare the readout at required scale and speed with hardware which was not designed for this purpose. At the end, the results are remarkable. Even if not perfect, we have a first large system which is (almost) functional. Even more important is probably the experience and feed-back for final readout. OR Per aspera ad astra Peter LICHARD CERN PH/ESE-FE

  2. Installation and commissioning • The scaled-down system was almost complete • MPOD with HV and LV modules • Low Voltage Patch Panels for power distribution and monitoring • HV dummy Patch Panel installed as the components have arrived too late • VME crates • Cabling – ethernet/readout+control cables, LV and HV cables, CANBUS • Owing to careful preparation, installation went smoothly • Connectivity and functionality checked with standard tools • Thanks and congratulations to everybody involved for a very good job Peter LICHARD CERN PH/ESE-FE

  3. DCS and services • LV patch panel • Equipped with ELMBs to control • Channel on/off • Measuring voltages on cover • Measuring line current • Measuring temperatures on covers and PP • Simple program for controlling ELMB used successfully during TR • QUALIFIED • We must wait with full production • Possibly new frontend with different power requirements Peter LICHARD CERN PH/ESE-FE

  4. DCS and services • HV patch panels • Ready for test with magnet to check HV relays • Test will be done in the real place in ECN3 • Test with DCS software passed • If they pass magnet test, we can start the full production Peter LICHARD CERN PH/ESE-FE

  5. DCS and services • MPOD • Received just 2 weeks before TR • Wiener OPC server updated • Tested quickly in POOL • Reports https://edms.cern.ch/document/1210689 • Stable and fully functional with both LV and HV modules • QUALIFIED • Full system ~70kCHF • We should start negotiation and procurement ASAP • 1 full system in 2013 • 3 (+1 spare?) in 2014 Peter LICHARD CERN PH/ESE-FE

  6. DCS and services • MPOD • Simple application for control • Channel on/off, voltage, current, etc • LV PP • Simple program for controlling ELMBs • DCS was remarkably stable and reliable ! THANKS • In 2013 we need to prepare DCS requirements document to be included in global DCS Peter LICHARD CERN PH/ESE-FE

  7. Readout • SRB • SRB not designed for such speed and amount of data • Lab tests • Test beam • Strong interest to participate to TR • SRB modified • DAQ • SRAM for data for ~330,000 events (full in few ms for nominal 33kHz/straw) • Trigger tag (time stamp) FIFO only for 1024 triggers • Readout speed per SRB • 64straws*2edges*48bits*rate33kHz ~ 25Mbytes/s • Reachable only using VME block transfer • Block transfer tested and functional • But never used in TR due to lack of time • A32D32 access used through all the run • Readout software developed and debugged during TR Peter LICHARD CERN PH/ESE-FE

  8. Readout – data flow Event Form + FIFO pushback Serial Link & CTRL • Rising edge TDC FIFO VME • Falling edge TDC FIFO MUX • Rising edge TDC FIFO FIFO FIFO BCID FIFO SRAM • Falling edge TDC FIFO FIFO BCID FIFO FIFO • Rising edge TDC FIFO FIFO BCID FIFO • Falling edge TDC FIFO 1 COVER (16 channels) FIFO BCID FIFO SRB Peter LICHARD CERN PH/ESE-FE

  9. Readout • Problems • VME 9U crates failing • Replaced 3 times! • Even 1 6U crate has failed • New 6U crates used • When data not extracted fast enough, events got mangled • FW modified, events kept intact even if some data lost • Garbage at the end of data block • We realized too late that there is a trigger after EOB • Cover switches to • DAQ mode after SOB • Test and control mode after EOB • Extra trigger after EOB was understood as a request for noise scan and the data were sent to SRB • Triggers disabled Peter LICHARD CERN PH/ESE-FE

  10. Readout • Problems (cont) • CARIOCA multiple hits • Min signal width ~30ns • But no signal width ~ few ns ? • ‘ringing’ at the end of signal • If it happens in 12.5 ns window, the measurement is wrong • The first data analysis indicates a lot of spurious data, mainly in the first days of TR • Sometimes number of triggers differ between SRBs • Probably because of trigger FIFO overflow (1k of triggers) • After FW and DAQ changes, improvement in data quality • Test in lab OK even for very high rates • The data from the last few days of TR should be OK • Waiting for analysis Peter LICHARD CERN PH/ESE-FE

  11. Readout • Plans • Finish DAQ and demonstrate the system running at required speed with good quality data (decoupled from frontend problems) • Clean up of the code and firmware • Create libraries with common functions • For FW it already exists • For SW must be done • Based on the experience from TR and from lab tests we have a very good input for designing the final readout Peter LICHARD CERN PH/ESE-FE

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