Minutes of the April 7, 2005 US ROD meeting

Follow up on action items

The dryer for the UCSB compressed air has arrived.
Next step: install it; then see if it helps.

Work on understanding reset problem on FNAL SR continues.
Ryan followed Guido's list of checks. Everything OK except clock line
on FEC2CCUM patchboard. See elog.

DefAna file corruption: Patrick, Yuri say it is fixed.

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

Bad channels appearing on rods

Both UCSB and SB see new bad channels on rods. Mostly, noisy channels.
See summaryes in FNAL elog and UCSB elog.
The bottom line is that we see about one new noisy channel every two modules.
These are generaly confirmed on ARCs. And they are reproducible.
Some evidence that they may be correlated with position on module
or on chip. But not terribly clear.
Could be that they are caused by pickup tool?
Tony says that in his experience physical damage does not cause noisy channels.
Action items:

See if there are bad channels that were there in ARCS and have disappeared on rods.

Visual inspection of new bad channels

UCSB

More studies of rod 178 from FNAL (the one that gives header errors).
Header errors appeared after 18 hours on MR. Swapped problematic
module, ran it in Vienna box for 12 hours, no problem.
Run rod itself with new module 3 days, no problem.
Conclusion: either module or intermittent rod, can't really tell. But what to do?

DS rod with 3rd cooling plate runs cooler, but T ~ 40 C on hybrid,
T ~ 55 on DCU. Is this OK? Sent mail to experts for advice.

No progress on understanding SW bug that causes bad pulse shape.

FNAL

Header error saga continues. replaces module with header errors with
another one. This should tell us whether it is a rod problem or
a module problem.

Ryan asks: what to do if we find termistor is broken? Good question!
We'll deal with it when it happens, I guess.

Components for assembly of spare cables etc from Duccio will come with rod shipment.