Current Situation and Plans

• We had been incurring into L3 disables at luminosities above about 60E30.
  Note that there are new prescale ranges above 60E30! We will choose prescales according to these prescale ranges but watch for L3 disables.
  If L3 disables appear:
  • Usually the L3 disables drop much faster than luminosity. If the L3 disable is more than 15%, as given by the DAQ monitor, for more than a few minutes, switch to a higher prescale set.
  • Notify the on-call trigger meister if the L3 disables do not go away after 30min or are still present at luminosities below 50E30 and L3 input rates below 600Hz.

• Any configuration change of a system needs to be approved by the Run Coordinator.

• Run Plan is "stack and store". Collect quality data with the full detector in readout. Commissioning activities should occur between stores, unless approved by the run coordinator. Between stores, collect zero-bias data with as much of the detector as possible.
• During Shot setup, the forward muon group will be raising the MDT voltages above the standby voltage in order to get data on losses. Muon experts are approved to set HV at levels different than "Standby" during this time, however a muon expert must be present to monitor these voltages.
• We are going to begin inserting the FPD pots again. You will need to make sure that you know how to remove the pots when necessary. Contact the FPD shifter on call for training.
• The Shift Captain should follow the MCR e-log and call MCR as needed to keep up with the schedule of the AD. MCR may give D0 quiet time or a Controlled Access. Get approval from the run coordinator for a Controlled Access. See the white board for Controlled Access requests (ask the Run Coordinator about approved work).
• Please read the D0 Logbook before your shift in order to be better prepared.

Magnet Polarities

Magnet ramps must be approved by the Run Coordinator.

since Wednesday February 3, 2005 :

   Solenoid = Forward
   Toroid   = Reverse

We will NOT change polarities on a regular basis.

See also Magnet Operations

Trigger Configuration

Rules for Selecting Prescales: The prescale files for V13 have names with luminosity ranges. Choose the prescale file for which the luminosity at the beginning of the run is within that range. The luminosity may fall below the lower bound during the run. Unless instructed otherwise by the trigger meisters, do not start a run with an initial luminosity not inside the correct prescale set.

Available prescale sets for the above trigger are:

     00-10E30, 10-15E30, 15-20E30, 20-25E30, 25-30E30, 30-35E30, 35-40E30, 
     40-45E30, 45-50E30, 50-55E30, 55-60E30, 60-68E30, 68-76E30, 76-84E30, 
     84-92E30, 92-100E30 and scraping 

   

In this configuration, we should see typical L1/L2/L3 accept rates of 300-1600/200-850/30-60 Hz, depending on the instantaneous luminosity and prescale set. If the rates are too high - L1>1700 or L2>900 or L3>65 Hz - or the global FEB exceeds 10%: page the Triggermeister. A good effort should be made to keep the global FEB rate below 7%.

Recorded Physics Run Limit:

• default 4 hours
• or 2 hours with prescale 80-100E30, 70-80E30, 60-70E30, 55-60E30 and 50-55E30
• or change prescale if the instantaneous rate in the Taker is < 25 Hz

The DØ Shift Schedule (D0 Shift Calendar)

Other shifters can be on-call:

1. if there is no Store,
2. if MCR states there is no shot setup expected for 4 or more hours,
3. if the situation with the sub-detector is stable,
4. if there are no sub-detector tasks to perform (checklist, calibration, special runs, monitoring), and
5. if the Shift Captain is in agreement

Calorimeter, Muon and CFT Shifters do not need confirmation from their sub-detector coordinators. However, there are Special Instructions for Muon Shifters and Special Instructions for CFT/CPS/FPS Shifters which must be followed before leaving.

Shifters must report in with the Shift Captain to give a contact number before leaving.

Global Monitoring: Trigger & Physics Examines

The name of an institution will be listed next to the GM shifter when the Global Monitoring shift is being run remotely. There is a GM Web Communicator GUI to be used by the Shift Captain, remote GM Shifter, and other shifters as needed. The interface is very simple; shifters communicate via typed text. The gui should be open by default on the Captain console. If not, the gui can be launched with the following command sequence: setup d0online; start_daq gmwebcom.

The vertex examine runs automatically (currently on d0ol77) and the Shift Captain looks at the plots. Michiel Sanders has documented the Vertex Examine. For reference, look at the VE plots entered in the logbook during previous shifts.

Periods Without a Shot Setup or Colliding Beams

By default, 'Recording' should be ON as we would like to monitor the full data path from the detectors to tape at the Feynman Computing Center.

There are three trigger bits with prescales which have been tuned both to exercise the L1, L2 and L3 rates and to send an average of 1 Hz to tape, and a low rate L3 mark and pass trigger that writes to the monitor stream. The prescales should only be changed by or with approval of the triggermeisters.

If there is a request for cosmic ray data: the default cosmics trigger list is official/special/cosmics-3.10.xml.