Current Situation and Plans

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

• Should we encounter a longer downtime during data taking and the problem does not get resolved within 45 minutes, the Run Coordinator has to be paged.

• Run Plan - Take data with the v16 global trigger with all crates in readout during store. During the period between stores, run the zero bias trigger. Detector examines should be run at all times.

• Calorimeter Calibration Data: Starting Sep. 22 and continuing for about six weeks we are going to add calorimeter calibration triggers into the data mix below 200E30. Among the effects are:
  • a higher than usual percentage of events going into the monitoring stream.
  • we are running closer to a 700 Hz L2 accept rate, and should hit this rate under normal conditions at the upper luminosity edges of the prescale sets.
  • additional prescale set boundaries at 80E30, 50E30 and every 10E30 below that. The additional prescale sets will lead to on average slightly shorter runs.
  Please continue to adhere to the rules for run transitions as laid out below, in particular that runs should not be shorter than two hours.

• Cosmics - During extended quiet time periods (> 1 hour) with no expectation of beam in the Tevatron, the captain should verify the overall status of the detector, inform MCR of our plans to ramp SMT HV, and arrange for a call from MCR prior to injecting any beam, and then take recording ON Cosmics with the following trigger list:
  official/special/cosmics_run2b_MTM_L3-1.10.xml ('onlyTTK' prescale).
  The muon and SMT HV should be ramped to full. Both magnets should remain ON. Note that any type of magnet ramping needs to be approved by the Run Coordinator.

• We are currently pausing the run during shot setup (ramp and squeeze) to allow power cycling of some PDT low voltage power supplies.

• Between stores and after accesses, calorimeter pedestal calibrations should always be attempted, even if it appears there will not be sufficient time. It is almost always the case that the pedestals will be completed in time, and even if beam is injected the CALMUO shifters and experts can choose not to use those pedestals. The MCR should NOT be contacted to request quiet time for this procedure. After a store start the calibration as soon as the beam has been dumped. After an access have the magnet(s) ramped without delay, and start the calibration when the magnet(s) are up.

• Logbook - Keep a good logbook. Include an explanation of any downtimes greater than 1 minute.

• Halo - Prior to declaring a store the proton halo rates should be less than 15 kHz. Once a store is declared, the halo rates will go up as the luminosity high voltage is increased. If the final rates are greater than 30 kHz after the store has begun, contact MCR to see if the Halo rates can be reduced. If the rate becomes more than 45 kHz, contact the run coordinator.

• Quiet time - Watch for possible quiet time. Page the Cal expert so that they can take their NLC runs. Page the SMT expert in case they would like to take scans. L1 Cal might also want to do calibrations. If there is remaining time, Cosmic runs should be taken. Quiet time should not be specifically requested without run coordinator approval.

• Alarms - make sure shifters understand alarms for their detector.

• All warning messages transmitted over the Fermilab emergency system are to be repeated by the captain over the D0 pager (x4674). This includes any weather warnings or watches.

• Test Runs: All test runs that are taken during physics should be approved by the run coordinator. All starts and stops of test runs should be kept to a minimum. The DAQ shifter and captain should be informed before any start of a test run. Any test runs that interfere with data taking should be stopped.

• The Shift Captain should follow the AD Run Coordinator and MCR e-logs 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 before requesting a Controlled Access or quiet time. 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 Saturday November 14, 2009:

   Solenoid = Forward
   Toroid   = Forward

We will change polarities twice each month, normally when the magnets already need to be ramped down. This still requires run coordinator approval. The next change will be during the first access opportunity occuring on or around November 29th. The next polarity set will be:

   Solenoid = Reverse
   Toroid   = Forward

See also Magnet Operations

Trigger Configuration

For prescales, choose the prescale for the appropriate luminosity range.

Follow these guidelines when evaluating the accept rates:

• The L1 rate should be below 1800 Hz at all luminosities.
• The L2 rate should be below 900 Hz at all luminosities.
• The L3 rate should be 100 Hz on average, and can go up to 250 Hz at the start of a store.

A good effort should be made to keep the global FEB rate below 7%.

Anytime the L3 disables are above 15%, change to the next higher prescale set.

Recorded Physics Run Limits:

• Runs should be changed at the prescale set boundary, except:
  • the minimum length is 2 hours,
  • the maximum length is 8 hours.
• Current prescale sets are found here

• The prescale sets above 320E30 have draconian measures to reduce the trigger rates. Thus at the beginning of high luminosity stores, one hour run may be taken to avoid running with such prescales.

The DØ Shift Schedule (D0 Shift Calendar)

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

CALMUO shifters need explicit permission from the Calorimeter sub-detector coordinators before going on call. They should also follow these Special Instructions for the Muon sub-detector.
Tracking shifters need explicit permission from CFT and SMT sub-detector coordinators before going on call.

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

Global Monitoring: Trigger & Physics Examines

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 OFF.

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_run2b_MTM_L3-1.10.xml ('onlyTTK' prescale).