Current Situation and Plans

• The A0 kicker power outage at 6:15 Sat Dec 20 caused a multi-house quench and introduced a large helium leak into the cryostat vacuum near the low beta house B1. The warm-up, repairs and subsequent cool-down is estimated to take 10 days. The Tevatron is expected to be ready for beam on Tue Dec 30

• Modified shift schedule for the duration through owl shift Tue Dec 30:
  • DAQ and operations shifts will be 24/7.
  • Captain & Detector Shifts:
    • Eve and Owl cancelled.
    • Day Shifts during weekends and holidays cancelled (Dec 21,24,25,27,28).
    • Day Shifts during working days are ON:
      • Complete checklists, assist experts, check system operations.
      • Captains should check training and handle SA keys.
  • GM Shifts cancelled.
  • Subsystem experts on-call 24/7
    • Make sure the DAQ Shifter has current contact info.
• Normal 24/7 shift schedule resumes with the Day shift Tue Dec 30.

• The D0 collision hall is in Supervised Access. Only the Shift Captain or Ops Shifter are authorized to distribute SA keys. Please remember to return your SA key if you leave the D0 premises - either for lunch or for home and particularly for the holidays.

• The detector irons will be opened Mon Dec 22 morning to allow access to the east and west cathedral for work on the ICD LV fanout box and to replace a Calorimeter preamp power supply. We plan on staying open until Fri Dec 26.

• 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.

Read the D0 Logbook before your shift in order to be better prepared!

Magnet Polarities

from Tuesday December 23, 8:00:

   Solenoid = Forward
   Toroid   = Reverse

from Tuesday December 30, 8:00:

   Solenoid = Forward
   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,
   30E30, 35E30, 40E30, 45E30, 50E30, 60E30, 70E30, 80E30, 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

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.