This stack is devoted to debugging..the next stack will be our first physics
 run to scan/find the psi-prime.

 We saw about 9 mA to start with at 8 am.

 Two major scares today:

 1) gas-jet would not turn on because the cryo-cooler was off because a
    small turbo-pump had failed. Consulting with Mauro M., we guessed we
    could run without this particular pump and so Dale Miller, bless
    him, removed the interlock from the Gould program. By 9:15 am, the cryo-
    cooler was on. It took 3.75 hours to cool from room-temperature to
    operating temperature. At 13:00, the jet was turned on.
  
 2) there was an alarm on the VLPC cryogenics system saying that the boil-off
    helium which is usually returned to the Tevatron was being vented to the
    air because it was highly contaminated (with oxygen). Such a condition
    could have been an indication of a serious problem. After looking at
    the temperatures throughout the system, however, it seemed that things
    were actually in a normal state and it turned out that the ARC cell which
    monitors the contamination level had put itself in an alarm state.
    
    These two issues although we overcame them exhausted my patience for the 
    day - apologies to people I may have been a little direct with.

 Judged by number of people in counting room, most active was Sci-Fi
 work..it will be nice to get a summary of where it stands after all this
 work.

 Counters are basically in good shape. The single p-e's of the Cerenkov are
 seen "on the scope" but the special setup to trigger on this has not been
 run, yet.

 I am told triggers are established.

 CCal is basically in shape. Michelle issued a general announcement that there
 is one counter which tends to kill its shaper channel when the HV is first
 turned on. There is a physical switch-box on this channel which should be
 set to OFF whenever HV is turned on and should be set to ON only after the 
 HV is established.

 Marco P. worked on the scalers; he found and corrected some miscabling.

 Dave J. worked on the luminosity monitor stuff, reorganizing the physical
 layout and setting appropriate thresholds in the discriminators on the
 left/right detectors.

 Willi sent an update on the online program - included here.
---------------------------------------------------------------------------
 From roethel@handel.phys.nwu.edu Tue Jan 25 21:40:27 2000
 From: Wilhelm Roethel <roethel@handel.phys.nwu.edu>
 To: E835 Collaboration <e835collab@fn835c>
 Subject: online monitor update

  Updates on the online monitor:

  * hodoscopes show the correct (new) mapping now (thanks to Diego!)

  * button 'save histogram' saves all histograms 

  * button 'reset all histograms' resets all histograms

  * at the beginning of a new run a histogram file containing all 
    histograms is written to 
     /lumin/dartdisk/daqman/onlmon/test/log/run_<runno.>eor.hbook
    The histograms are NOT reset

  * pressing 'Quit' also saves all histograms to the log file (end then
    end the program with a core dump)
  
  hbook files of some (short) runs can be found under 
    /lumin/dartdisk/daqman/onlmon/test/log/...
  please check your detectors. There is also a (updated) summary printout
  of the histograms in the counting room. 

  - Willi
---------------------------------------------------------------------------  

 Giovanni said HV controllers are all functioning correctly.

 -->Program for this evening: (I'm at home)

 Check Online Monitor - histogram correctness and detector performance.

 Install/test/debug new code in Prude.

 Do peds - jet-on/jet-off
 
 Write a disk file.

 Write a data tape.

 Turn jet off; turn cryocooler off ready for pump replacement tomorrow am.

 Decelerate Stack  (starting around 11 pm).

 Dump beam.

 Access till 7:30 Wednesday morning.

=========================================================================


 Stephen