Weekly meeting on MDC readout upgrade

-- BurkhardKolb - 21 July 2009


BurkhardKolb, JanMichel, JoernWuestenfeld, LotharNaumann, AttilioTarantola, MichaelTraxler


  • work has started including init from DB
  • Joern will come to GSI mid July to work with Ilse and Attilio
  • link to DataStructure
  • link to OEPNetworkAddresses
  • Michael will provide perl script for daq-anal, sniff, decode...


  • It works - but
  • transfer too slow (FPGA to TRB?)
    • at GSI it runs with 75kHz
    • what's wrong at FZD?
    • no news yet
  • edge triggered data reception in FPGA
    • double and triple hits on same address, 0-hits
    • on all MBOs?
    • only on chains of 2 or more MBOs?
  • GDE signal derived from trigger, but MBO derived from CMS
    • GDE to late?
  • GDE release during calibration
    • reset hit registers to early?
    • data ok?
  • Make tests with pulser to measure electronics efficiency
  • new tests with pulser LVL1 up to 1MHz
  • high threshold with EB up to 20kHz - maybe the network with 10Mbits is the problem...
  • shielding - not clear if efficient, new residual plots needed
    • see FZR results (added by CM)
    • my (CM) interpretation of the recent results: NO significant change of the noise level, i cannot recommend to install these additional shieldings, also due to the unclear influence of the HV current, reported by Jörn.
  • charging up has to be investigated

decision on priority was taken

  • priority
    • 1. switch fast to OEP
    • (fix all errors on current design)

current work at GSI

  • Sector 4, layer 3 (POFs) and 4 started
  • all cables and POFs should be fixed to chamber, not to supports
  • new cable type for Common Stop needed (Michael)
  • better labels needed (Kathrin)

OEP work

  • Attilio reported about bit shifts in the FPGA
    • problem with Lattice design software
    • is manufacturer contacted? yes
    • problem not yet understood
    • comes and goes
    • now has disappeared
  • one link is now working
    • with data and calibration triggers
    • short and long MBO working
    • data file with current data format needed
    • new data format (2 times in 1 32-bit word) not yet
  • Jan is working on a 16 link version
    • ID info of several OEPs read out on hub
    • 8 links seem to work
    • problems with place and route software when more than 8 ports are used.
    • send problematic design to Lattice for help
    • still bit errors in media interface, sometimes dependend on recompilation of design, sometimes intermittent in time.
  • patched TRB needed
  • power distribution board to be tested (Kathrin) (5V, +-3V, 1.4V, 3.5V)
  • power now supplied by Genesys power supplies
  • test in cave with CMS needed for general green light
  • LVDS CMS signal cabled up
  • cross talk can be seen up to a distance of about 5mm
  • watch out during cabling!!!
  • needs now realistic cabling with more MBOs
  • test in cave with 1 MBO and 1 OEPB was done, see pictures of noise TestsinCave
  • qfile_009.tif: noise on analog readout during readout
  • qfile_010.tif: noise on analog readout during readout
  • qfile_011.tif: noise on analog readout during readout
  • readout test was running whole night through
  • agreement was reached on the possibility to switch between two different compression formats for debugging
  • work starts now (SY) to get it in standard readout to HLD-files

New transmission problem 21. July

  • Attilio reworked the FPGA code to support debugging
  • sometimes empty events with some wordcount are sent
  • problem seems to be in sending part
  • has to be solved until next week

How to load thresholds and firmware

  • manipulate threshold in Oracle, output to files
  • automatic load via TRBnet to TDCs
  • take threshold data from FPGA after update and insert into data stream?

efficiency measurements at FZD

  • starts at 1900V (plateau), not understood yet, maybe gas mixture?
  • try out Argon isobutan mix
  • change gas flow (oxygen?)
  • small gas leaks are fixed, but no significant improvement at 60/40 mix
  • plateau at 1650 with 80/20 mix, see efficiency plateau
  • new measurements with gas flow switched off indicate leakage and contamination (oxygen) when flow is too low
  • He leak detection will be performed again
  • O2 measurements at FZD, manual available now
  • electrolyte cell was empty
  • needs new evaluation

Topic attachments
I Attachment Action Size Date Who Comment
CellvsT1_s2m0l0.jpgjpg CellvsT1_s2m0l0.jpg manage 43.6 K 31 Mar 2009 - 10:49 JoernWuestenfeld Cell vs. Time1 for layer0
CellvsT1_s2m0l1.jpgjpg CellvsT1_s2m0l1.jpg manage 37.8 K 31 Mar 2009 - 10:50 JoernWuestenfeld Cell vs. time1 for layer1
CellvsT1_s2m0l2.jpgjpg CellvsT1_s2m0l2.jpg manage 41.4 K 31 Mar 2009 - 10:50 JoernWuestenfeld Cell vs. time1 for layer 2
CellvsT1_s2m0l3.jpgjpg CellvsT1_s2m0l3.jpg manage 43.6 K 31 Mar 2009 - 10:50 JoernWuestenfeld Cell vs. time1 for layer3
CellvsT1_s2m0l4.jpgjpg CellvsT1_s2m0l4.jpg manage 42.7 K 31 Mar 2009 - 10:51 JoernWuestenfeld Cell vs. time1 for layer4
CellvsT1_s2m0l5.jpgjpg CellvsT1_s2m0l5.jpg manage 46.1 K 31 Mar 2009 - 10:51 JoernWuestenfeld Cell vs. time1 for layer5
Efficency.jpgjpg Efficency.jpg manage 36.5 K 20 Apr 2009 - 07:00 JoernWuestenfeld Efficency of variouse gas mixtures and flows
MB-Shielding-FZR.jpgjpg MB-Shielding-FZR.jpg manage 42.8 K 28 Apr 2009 - 15:29 ChristianMuentz MB Shielding
MDC-TRB-dataword01.pdfpdf MDC-TRB-dataword01.pdf manage 23.7 K 20 Apr 2009 - 12:49 JoernWuestenfeld MDC dataword comparison SAM -> OEP
MdcGas.jpgjpg MdcGas.jpg manage 95.0 K 21 Apr 2009 - 09:40 ChristianMuentz # of cluster He/Isob Ar/Isob
Noise.pdfpdf Noise.pdf manage 15.0 K 22 Apr 2009 - 09:06 JoernWuestenfeld Comparing absolute Noise distributions
NoiseComparison.pdfpdf NoiseComparison.pdf manage 105.4 K 06 Apr 2009 - 06:45 JoernWuestenfeld Compairing noise situation with and without MBO shielding.
Normalized.jpgjpg Normalized.jpg manage 46.9 K 20 Apr 2009 - 07:00 JoernWuestenfeld Efficency normalized to coincidence countrate and fitted with fermi function
efficencyPlateau.jpgjpg efficencyPlateau.jpg manage 31.1 K 07 Apr 2009 - 13:00 JoernWuestenfeld Plateau curve of efficency
gasdep.jpgjpg gasdep.jpg manage 31.2 K 21 Apr 2009 - 10:50 JoernWuestenfeld gas dependency plot
noisedifference.jpgjpg noisedifference.jpg manage 25.2 K 22 Apr 2009 - 09:06 JoernWuestenfeld Difference in Noise between shielded and unshielded MBO's
qfile_009.tiftif qfile_009.tif manage 14.1 K 16 Jun 2009 - 11:19 BurkhardKolb noise on analog readout during readout
qfile_010.tiftif qfile_010.tif manage 12.7 K 16 Jun 2009 - 11:19 BurkhardKolb noise on analog readout during readout
qfile_011.tiftif qfile_011.tif manage 15.3 K 16 Jun 2009 - 11:20 BurkhardKolb noise on analog readout during readout
streamer_tubes_nima_1982_Seite_04_a.jpgjpg streamer_tubes_nima_1982_Seite_04_a.jpg manage 61.8 K 21 Apr 2009 - 06:17 LotharNaumann Ar/isobuthan dependend working characteristics
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Topic revision: r33 - 21 Jul 2009, BurkhardKolb
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