Decommissioning

Post Collider Operations

and

Detector Decommissioning

Schedule Information

• SMT annealing studies expected to begin on Thursday 22 December

• Will begin shutting down subsystems not required to support SMT annealing studies in an orderly manner once the warm-up of the silicon for the annealing studies is underway

• Expect to start warm-up of the solenoid on Tuesday 27 December

• Plan to continue calorimeter bias current studies through Wednesday January 4

• Plan to begin draining liquid argon from the calorimeters on Thursday January 5

• Currently plan to begin warm-up of VLPC cryostats on Wednesday January 11

•

• Post collider operations period now scheduled for 30 September 2011 through early morning 22 December 2011

• Expect to record global triggers supplemented with CTT based cosmics and prescaled muon system triggered cosmics

– Daily calibrations

• Readout entire detector

• Primarily for tracker alignment refinement and verification and calibrations

– ~1 million tracks through the silicon detectors

• Also provides potential for insights into detector performance in absence of collisions

• Investigate calorimeter bias current evolution in absence of collisions

– some parts of calorimeter will have HV off

• Eight weeks with magnets off

• One week in each of the four magnet polarity combinations

– Also provides opportunity to verify clustering and Lorentz corrections

All requests for survey and/or alignment crew support should be submitted through Bill Cooper (Cooper@fnal.gov) with copies to d0rc@fnal.gov.

Collision Hall Access Plan

Collision hall will generally remain secure during post-collider operations period to facilitate magnet on operations. Collision hall access requires prior approval of the Run Coordination team.

– Rad safety authorized collision hall activities include

• Routine maintenance

• Inspections

• Troubleshooting

• Installation and removal of equipment in accordance with procedures

– Prohibited collision hall activities include

• Eating, drinking and smoking

• Cutting, drilling or grinding on radioactive materials

• Work in areas posted as “High Radiation and/or Contamination Areas”

Don’t forget to frisk yourself and survey anything that comes from the collision hall as you exit.

Shift Coverage (and responsibilities) During Post-Collider Operations Period

Shift coverage through 23 December 2011 is as follows:

· On-call support for each subsystem should be available as usual.

· On-call experts are asked to stop by the control room daily and verify detector performance.

· Captains in control room during the day (with additional responsibility to attempt to keep DAQ running when possible), and cosmic shifter in the control room around the clock on evening.

o During periods of reduced control room presence, captains and DAQ shifters are expected to also monitor SMT IDVDD and heartbeat guis to ensure that the SMT is appropriately protected.

o While cosmics are running, shifter is also asked to post CTT examine plots and verify that special examine is running at CFT console

o Shifter should monitor for calorimeter noise, post plots as appropriate, and check for alarms, paging experts for problems they cannot solve.

· Operations shifter scheduled during the day. Cryo and infrastructure monitoring during the rest of the day via alarms with Auto-Dialer calls to engineering support.

Reference Material

DZero Detector Decommissioning All Experimenters’ Meeting 19 Dec 2011

Detector Decommissioning Talk at DZero Collaboration Meeting 9 Dec 2011

TeV Decommissioning Working Group Meeting 22 November 2011

Directors Review of TeV Decommissioning 15 September 2011

Tevatron/CDF/DZero Decommissioning Plan 6 June 2011 (during DOE Fermilab S&T and Research Review)

DZero Detector Decommissioning Plan 13 July 2010 (during DOE Annual Science and Technology Review)

Tevatron Detector Decommissioning Plan 1 July 2009 (during the DOE Annual Science and Technology Review)

Tevatron Detector Decommissioning Plan 25 June 2008 (during the DOE Annual Science and Technology Review)

Additional Reference Information

DAQ tutorials

Running the DAQ