Minutes of the April 28, 2005 US ROD meeting

Follow up on action items

  1. The dryer for the UCSB compressed air is now installed.
    Need to see if it helps going to lower temperature.
    Yes, works great.

  2. Jim has not yet started talking to JT about scripting the
    comparison between ARCS and rod data.

  3. Opens at FNAL can be seen OK, need to re-check UCSB
    UCSB: at warm T OK, but common mode noise still high.
    Still need to check low T.
    News on noise at UCSB: much better on SR after some OFEDS
    have been switched to different VME crate.

  4. UCSB: Sort out problem with bad lemo.
    Only affects DS rod, so not terribly urgent, but should be followed up.
    Can't seem to find what problem is.

  5. UCSB: DS rod bad noise. But using modules that went through severe cycles.
    Need to put new modules on it and retest.
    On back-burner until modules become available.
    In the meantime take a couple of these modules off and see what they look like on ARCS.
    Not yet.

  6. UCSB: Redundancy test. Getting errors. Check with Ryan
    No news

  7. UCSB: Tests of rod 178 (header-error rod from FNAL) continue. Swap
    module that gives errors to try to correlate with either rod or module.
    Put this on back-burner now that production has started.

  8. Lt SW bug that causes bad pulse shape. Valeri on it.
    No news

  9. DS rod with 3rd cooling plate runs cooler, but T ~ 40 C on hybrid,
    T ~ 55 on DCU. Sent mail to experts for advice.
    Mark Raymond says that APV within specs of process -- although no real data on it.
    Experts say DCU is OK too.

  10. UCSB: check if need additional delay for T settling in MR scenario like FNAL
    No news, but decide to apply this delay too.
    11. FNAL: Tested bunch of new HPK rods in SR. Two out of six have broken or shorted
    termistor. Strange because Lenny says that these are chcked on rod frame.
    Possibilities: bad check on rod frame, or bad connection through flat cable, or bad DCU on hybrid.
    Check module fast-test
    Probe with multimeter
    No news

  11. FNAL: add cooling loop to MR.
    Decide to see if can survive without it.

UCSB

Production started. Making two rods a day.
Five made so far, four have been tested on SR.

First two rods still had modules with new bad channels (scratches).
Redesigned the pickup tool. Now no contact with silicon, only with frame.
Seems to work.

Have written GUI to facilitate SR operation.
Will share with FNAL, if interested.

One rod has I2C errors in SR.
After discussion decide to put it aside awaiting further
understanding of what causes these errors.

FNAL

Two modules with header errors are OK in ARCS.

MR: Installed Lt V26. Some problems, not ready for prime time.

New action item: Long discussion of MR data analysis. My summary:
  1. Will run DefectAnalyzer to make XML file.
  2. DefectAnalyzer does not make plots, or rather if it
    makes plots it corrupts the root file.
    So, run root macro to make plots.
  3. Run PERL script on XML file to provide human readable output
What a mess. But this is what Vienna Box people do.
Start with cuts like Vienna Box.

Yuri concerned that depending on how many rods run in the
fridge at a given time, the time-duration of burn-in
can be different for different rods.
Agreed that will add extra delays for fridge loads with few rods.
Will need experience.