Current Situation and Plans

• Studies to understand Toroid-induced noise in the calorimeter and PDT systems are ongoing. When taking global physics data, use prescale sets with the "_Gap_off" postfix in order to avoid excessive rates from gap triggers due to noise events.

• The MCR schedule foresees stack and store.
• A 10 days shutdown is scheduled for March, with a tentative start date of Monday, March 15th. It is planned to perform installation/maintanance jobs in different parts of the accelerator complex, and to give CDF an opportunity to extract a wireplane from their central drift chamber which is showing unexpected effects of aging. The length of the shutdown is driven by vacuum work at A4 - if the vacuum fails before March 15th, the shutdown will start early. The D0 collision hall will be in supervised access, and the number of shifters will be reduced. We will update everybody on the schedule of the shutdown as soon as details become available.
• Prescale sets:
  Due to severe DAQ instabilities (PDT readout crashes, muon L1 crate going out-of-sync) if the Level 2 accept rate exceeds approximately 850Hz, there are new and modified prescale sets. The basic rule remains: "use the prescale set closest to the luminosity at the beginning of the run". See below for the list of available prescale sets. If the luminosity exceeds about 60E30, the L2 rates will be too high even with the 55E30 prescale set - in such a case, use the "Emergency" prescale set.
• STT Commissioning
  The STT is in a critical commissioning stage, and is not used for physics yet. From time to time these crates cause downtime for the experiment and our procedure is the following:
  • Beginning of a store: Only "stable" STT crates should be included in the run, and only if confirmed by the STT shifter or STT expert.
  • Additional STT crates should only be included once the luminosity drops below 15-20E30, and only if their inclusion serves a specific purpose as communicated by the STT shifter or expert.
  • Problems if there is an STT shifter in the control room: let the STT shifter investigate and try to resolve problem with STT crate. If you have to spend more than half an hour per 8 hours shift resolving STT crates problems, remove ALL STT crates from data taking. In that case, addition of STT crates to data taking should be done between stores only.
  • Problems if there is no STT shifter: if SCL init does not help, end run immediately, remove ALL STT crates from the run, continue data taking. Adding back STT crates to data taking should only be done between stores.
• Rescraping of the beam:
  In the last couple of weeks, MCR has repeatedly performed a rescraping of the beam in the middle of the store. In such a case, the regular end-of-store and begin-of-store procedures should be followed. In particular, the DAQ shifter should issue corresponding store_end and store_begin commands; for the luminosity accounting it is perfectly OK to fragment a single store into separate time periods.
• The Shift Captain should follow the MCR e-log and call MCR as needed to keep up with dynamic schedule of the Tevatron. MCR may give D0 quiet time or a Controlled Access. Page Dmitri Denisov for Controlled Access approval. See the whiteboard for Controlled Access requests.
• Please read the D0 Logbook before your shift in order to be better prepared.

Magnet Polarities

from Tuesday March 2, 8:00:

   Solenoid = Reverse
   Toroid   = Forward

from Tuesday March 9, 8:00:

   Solenoid = Reverse
   Toroid   = Reverse

from Tuesday March 16, 8:00:

   Solenoid = Reverse
   Toroid   = Forward

See also Magnet Operations

Trigger Configuration

Rules for Changing Prescales: choose the prescale set which has a name closest to the luminosity at the start of the run.

Available prescale sets for the above trigger are:

   02E30, 05E30, 08E30, 10E30, 13E30, 17E30, 20E30, 25E30,
   28E30, 35E30, 40E30, 45E30, 48E30, 55E30, Emergency, and scraping.

In this configuration, we see typical L1/L2/L3 accept rates of 600-1400/300-800/30-60 Hz, depending on the instantaneous luminosity and prescale set. If the rates are too high - L1>1500 or L2>850 or L3>65 Hz - or the global FEB exceeds 10%: contact the Triggermeister. A good effort should be made to keep the average global FEB rate below 6%.

Recorded Physics Run Limit:   4 hours    or   instantaneous rate in Taker < 25 Hz
In the case of bad luminosity lifetime (early in the store): start a new run with the appropriate prescale set after 2 hours

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 Shift Captain is running the vertex examine (currently on d0ol27). Michiel Sanders has documented the Vertex Examine Instructions (pdf and html). 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-3.00.xml. If the CTT is available, official/special/cosmics_trk-1.00.xml can also be used.