Thursday, January 8, Notes

Present:   A. Byon, R. DeMaat, R. Downing, G. Drake, C. Drennan, J. Elias,

           S. Hahn, C. Nelson, S. Orr, K. Schuh, A. Tollestrup

EMI/EMC Equipment
     The equipment has been ordered.  After it arrives, the plan is to make
systematic measurements on 60 Hz power supplies and followup on the initial work
on correlations with strip chamber measurements.  Alvin strongly recommended
that systematic measurements of every system be made to build up a data base,
even if the data is only relative not absolute, for use down the road when we
find that we have a problem.  Craig Drennan is to be the one responsible for the
equipment and the expert on its use.
Measurements on 400 Hz supplies are to be a purchased one-time service.

PISA Boxes
     No activity to date.  Pisa is sending a team to refurbish the boxes and
transfer expertise to those responsible for support during Run II; they are
expected in a week or so.  Steve Hahn and Charlie Nelson are to make a plan,
with the Pisa folk, on modifications to breakup ground loops and quiet the
control traffic.

SVX
     The configuration has been completely changed since the grounding and
shielding workshop.  And the dust hasn't settled yet.  Ed Barsotti suggested
revisiting this issue in early February (he and John Anderson are probably the
experts).  A separate session is needed for a review of the controls system
which is a Rochester responsibility.  Finally, the cooling system should be
looked at especially for ground loops and solenoids.

Calorimeters
     The barrel and end wall are OK, except for the open question on Pisa boxes.
For the end plug, there is an open question regarding location of the CAEN power
supplies.  A ground loop interrupting resistor in the HV cable braid isn't
needed if the main frames are mounted on the plug itself.  But if they are moved
upstairs, the resistors become necessary (and painful).  Steve Hahn is to check
into whether the source mover system contains ground loops through the detector
steel.  Keith Schuh and Stan Orr are to take a guided tour of the plug
temperature control system looking for things like relays, solenoids, and ground
loops.

Shower Max.
     The physics limit for noise is now known.  Measurements will continue using
RABBIT electronics until late spring when in situ measurements with QIE readout
becomes possible using the extended vertical slice system.

Muons
     The CMX system has never been reviewed and should be looked at soon.  A
test needs to be done as to whether the bypass capacitor added to the CMU to
solve their noise problem causes a noise problem for the strip chamber.  This is
a whole arch test where the situation with all CMU HV cabled up is compared to
that with all cables unplugged.  If there is trouble, we will need to look into
resistor isolation of the cable braids at the upstairs ends (and write a safety
analysis).  There is a metal patch panel downstairs for HV to the scintillators
which must be replaced with an insulating one (I&I group task).

Master Clock
     This appears to be done; all of the links will have both characteristic
impedance terminations and common mode shield terminations.

COT
     The principal concern was the vulnerability of the interface cards to
pickup from other systems activities.  This topic needs to be revisited once the
final configuration has been determined.

Trigger/DAQ
     There is an open issue regarding network configurations and ground loops.
This group is well aware of the problem and their solutions should be reviewed
as soon as they are ready.  One interesting question is whether ethernet is
active during data taking operations; the answer is presumably yes as one
expects that "idle patterns" are constantly being sent.

Slow Controls 
     A review is definitely needed.  Rich Schmitt is the expert.

Luminosity Monitor
     A review is definitely needed.  Jaco Konigsberg is the expert.