From wagner@fnal.gov Fri Nov  9 16:50:13 2001
Date: Fri, 09 Nov 2001 16:28:52 -0600
From: Bob Wagner <wagner@fnal.gov>
To: Evelyn Thomson <thomsone@fnal.gov>, Avi Yagil <Yagil@fnal.gov>,
     dittmann@fnal.gov, Greg Veramendi <mendi@cdfsga.fnal.gov>,
     joao <guima@fnal.gov>, Peter Tamburello <tamburello@fnal.gov>,
     Robyn Madrak <madrak@fnal.gov>, Aseet <mukherjee@fnal.gov>,
     Ayana <holloway@physics.harvard.edu>, Bill Robertson <Robertson@fnal.gov>,
     Eiko <eikoyu@fnal.gov>, JC Yun <yun@fnal.gov>,
     Ken Schultz <kschultz@fnal.gov>, Kevin Burkett <Burkett@fnal.gov>,
     Kevin Pitts <kpitts@fnal.gov>, Kirby <kirby@fnal.gov>,
     Marina Brozovic <brozovic@fnal.gov>, Morris <Binkley@fnal.gov>,
     Ting <tmiao@fnal.gov>, Tom Phillips <phillips@phy.duke.edu>,
     Young-Kee <ykkim@fnal.gov>, Dave Ambrose <ambrose@fnal.gov>,
     Nigel Lockyer <lockyer@fnal.gov>, Bill Orejudos <orejudos@fnal.gov>,
     Peter Wittich <wittich@higgs.hep.upenn.edu>
Subject: COT day work on 11/9


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 COT work on 11/9 Day shift:
 
    Minimal work was done to the the Plug movement.  One noisy area in
SL8 was made quiet, but otherwise it was just Spy observations:
 
   SL8-387 (D,619,18-06-3): 00 dead, 01 hot!, 03 warm, 00 null
 
      --> OWL: High occ with calib noise at high wire end.
--> FIXED: Noisy wires became solidly quiet after Copper tape secured the
F-cage around the OD extrusion.
 
   SL8-437 (D,704,19-07-0): 00 dead, 01 hot!, 07 warm, 01 null
 
      --> OWL:Null noise, probably from dead wire #08.
-->Spy: Confirmed noise on 437 only and not on 436 (where #08 is dead). 
Noise appears as after-pulsing at 70ns on most channels.  Before
baggie-ing, will will better copper tape around the corner.
 
   SL8-396 (D,664,18-04-0): 00 dead, 01 hot!, 07 warm, 00 null
-->Spy: Both 396 and 397 channels have reflected pulses at 160ns.  See
normal looking reflection of calibration pulse at 160ns.  Since both
cells are affected, this is likely a grounding problem at the ASDQ end. 
Will have to leave this for another access.
 
   SL8-401 (D,666,18-04-2): 00 dead, 01 hot!, 04 warm, 01 null
-->Spy: Looks just like SL8-437 with noise on only one cell (401) and
appears as after-pulsing 70ns after first pulse.  The calibration pulse
has a larger than normal reflection at 150ns.  Still guess that it is on
the HVDB end since only on cell is affected, so more Copper tape will be
applied before baggie-ing.
 

   SL7-344 (D,632,08-05-0): 00 dead, 00 hot!, 00 warm, 04 null
   SL7-345 (D,632,08-05-0): OKAY
 
      --> Slight null noise, but smeared DTH points.
-->Spy: Very slight noise on cell 344 high channels: can spot a 300ns
late reflection.   -- doesn't seem very worrisome.
 
   SL7-378 (D,693,09-06-1): 00 dead, 01 hot!, 04 warm
   SL7-379 (D,693,09-06-1): 00 dead, 00 hot!, 09 warm
 
      --> Large null noise, high DTH.
      --> From May, good calibs at rptr but might be missing 10 ohm,
          see sync noise 80 and 180 ns after leading output (40 ns wide).
-->Some channels in both cells are reasonably noisy event with the pulser
turned off.  The pulses apear a bit wider than normal.  There may be two
problems here -- 1)likely a grounding problem at the ASDQ end, and 2)the
above mentioned repeater problem.  Both will likely have to wait until
another access.