1. Installation of the T600 at Fermilab CSN2, September 22, 20151

2. Foreword The installation and start of operation of the T600 detector at Fermilab will require a number of actions that will include: Agreements and assumption of responsibilities Definition of workpackages including definition of resources Procurements Preparatory works Mechanical installation Cabling Tests and final acceptance tests Pre-commissioning phases Commissioning Operation The following document illustrates the sequence of operations for the installation and preparation for commissioning of the T600 detector. The subcomponents will arrive from CERN and INFN, infrastructures will be put in place by Fermilab. CSN2, September 22, 2015 Slide: 2

3. Step 1 – Warm vessel structure pre-assembly The Warm Vessel structure will be transported to FNAL in large pre-assembled sub- components. The structure basement will be assembled (bolted) on adequately aligned concrete supports. Possibly, the lateral walls will also be assembled in parallel. CSN2, September 22, 2015 Slide: 3 Requirements: Equipped space, concrete blocks for supports (aligned and surveyed), mains, ventilation, heating. ≈1 m

4. Step 2 – External containment skin assembly The external, continuous, stainless steel skin will be welded to the pre-assembled warm vessel basement and lateral walls Helium leak tightness (10 -8 mbar x liter / s) tests will be performed on all welds. Leaks will be repaired. CSN2, September 22, 2015 Slide: 4 Requirements: Equipped space, concrete blocks for supports (aligned and surveyed), mains, ventilation, heating, fumes detectors, helium, helium leak detectors. ≈1 m

5. Step 3 – Warm vessel positioning and assembly (phase 1) The warm vessel basement will be positioned in the final location on reference areas. The lateral walls will be put in place and bolted to the basement and to each other. The external Stainless Steel skins will be welded together and tested for Helium leak tightness. In parallel the top part of the the warm vessel could be assembled, if space is available. CSN2, September 22, 2015 Slide: 5 Requirements: reference support areas aligned and surveyed, mains, ventilation, heating, fumes detectors, helium, helium leak detectors.

6. Step 4 – Thermal insulation assembly (phase 1) Thermal insulation panels will put in place for the basement and the lateral walls. Special elements will be installed in correspondence with the 20 supports. In parallel, the top parts of the insulation can be assembled, if space is available. CSN2, September 22, 2015 Slide: 6 Requirements: placements surveys, mains, ventilation, heating.

7. Step 5 – Thermal shields assembly (phase 1) Thermal shields will be transported to FNAL in large sub-components, already tested at 15 bars. Bottom and lateral parts will be assembled with the input lines and tested to 15 bars. CSN2, September 22, 2015 Slide: 7 Requirements: mains, ventilation, heating, safety for tests.

8. Step 6 – Placement of the cold vessels The two cold vessels will transported to FNAL earlier and stored appropriately. The two cold vessels will be inserted in the building one at a time and appropriately prepared to be lifted in the final position. The two cold cold vessels will be lifted in the final position with appropriate surveys. CSN2, September 22, 2015 Slide: 8 Requirements: internal and external cranes, unloading/loading personnel, moving docks, surveys, mains, ventilation, heating.

9. Step 7 – Internal cabling (phase 1) Readout cables will be taken from the inside of the cold vessels though the connecting “chimneys”. A survey of the TPCs will be performed. The ceramic resistances that connect the race tracks will be put in place. All other vacuum tight connections crossing the thermal insulation will be installed, including the pipe for LAr filling and recirculation. This last action requires a person to go inside the cold vessels; after that the manholes will be definitively sealed. CSN2, September 22, 2015 Slide: 9 Requirements: mains, ventilation, heating.

10. Step 8 – Internal vacuum tests All ports of the Argon circuit (“chimneys”, etc.) will be temporarily closed and vacuum pumps will be installed on each container and on the container walls. All installed connections will be tested for helium leak tightness (10 -8 mbar x liters / s). CSN2, September 22, 2015 Slide: 10 Requirements: mains, ventilation, heating, helium, helium leak detectors, safety for tests. Turbo pumps (2X) Roughing pumps (3x) Turbo pumps (2X)

11. Step 9 – Thermal shield assembly (phase 2) The top part of the thermal shield will be installed together with the output lines and all the circuit be tested again at 15 bars. CSN2, September 22, 2015 Slide: 11 Requirements: mains, ventilation, heating, safety for tests.

12. Step 10 – Thermal insulation assembly (phase 2) The top part of the thermal insulation will be installed and bolted to the lateral walls. The external Stainless Steel skins will be welded together. CSN2, September 22, 2015 Slide: 12 Requirements: mains, ventilation, heating, safety for tests.

13. Step 11 – Cosmic Rays Tagger Installation (phase 1) The bottom, front (beam side), and lateral parts can be installed at this point. CSN2, September 22, 2015 Slide: 13 Requirements: mains, ventilation, heating, safety for tests.

14. Step 12 – Thermal insulation assembly (phase 3) Rubber joints will be attached between the external stainless steel skin and the “chimneys” to ensure tightness of the insulation volume and allow displacement of the chimneys during cool down. The tightness of the rubber joints and the top welds will be tested. CSN2, September 22, 2015 Slide: 14 Requirements: mains, ventilation, heating, safety for tests.

15. Step 13 – Installation of external equipment Two main activities will be carried on, in parallel, from this point on. Installation of the external joints on the chimneys (crosses); installation of argon and nitrogen external piping. all items will be transported from CERN or Italy stored inside containers. CSN2, September 22, 2015 Slide: 15 Requirements: mains, ventilation, heating, crane.

16. Step 13 – Installation of electrical feedthroghs The electrical feedthroughs for the wires and PMTs readout and Voltage supply will be installed. The optical feedthroughs for the PMTs calibration will be installed. CSN2, September 22, 2015 Slide: 16 Requirements: mains, ventilation, heating, crane. Step 14 – Installation of electrical feedthroghs Partially occupied

17. Step 13 – Installation of electrical feedthroghs Gas and liquid recirculation systems will be installed together with safety valves, manual valves, pressure and vacuum gauges, until the argon circuit is fully installed and sealed. CSN2, September 22, 2015 Slide: 17 Requirements: mains, ventilation, heating, crane. Step 15 – Complete the argon circuit LAr pump LAr Filters GAr Filters

18. Step 13 – Installation of electrical feedthroghs The argon volumes are put to a slight overpressure (≈150 mbar). The absolute pressure will be monitored over few days to search for large leaks. CSN2, September 22, 2015 Slide: 18 Step 16 – Pressure leak test (pre-commissioning – 1) LAr pump LAr Filters GAr Filters Requirements: mains, ventilation, heating, oxygen deficiency sensors, argon gas (100 m 3 ).

19. Step 13 – Installation of electrical feedthroghs Vacuum pumps and gauges will be installed and tested CSN2, September 22, 2015 Slide: 19 Requirements: mains, ventilation, heating, crane. Step 17 – Installation of vacuum pumps and gauges Turbo pumps (4X)Turbo Pumps (4X) Roughing pumps (5x)

20. Step 13 – Installation of electrical feedthroghs Vacuum will be started. Helium leak tests will be done on all external connections of the argon circuit, the purification filters will be opened as a last part of the leak tests. Vacuum pumping will continue until the final commissioning phases. CSN2, September 22, 2015 Slide: 20 Requirements: mains, ventilation, heating, helium, helium leak detectors, safety for tests.. Step 18 – Vacuum and Helium leak tests (pre-commissioning-2)

21. Step 13 – Installation of electrical feedthroghs All Nitrogen circuit will be installed, including pumps, valves and gauges. CSN2, September 22, 2015 Slide: 21 Requirements: mains, ventilation, heating, crane. Step 19 – Complete the Nitrogen circuit LAr pump LAr Filters GAr Filters LN2 pump Phase separator

22. Step 13 – Installation of electrical feedthroghs The external cryogenics equipment (storage dewars, transfer lines, controls) will be put in place and connected to the apparatus. CSN2, September 22, 2015 Slide: 22 Requirements: mains, ventilation, heating, crane. Step 20 – External cryogenics LAr Storage Pre-Filter LN2 Storage

23. Step 13 – Installation of electrical feedthroghs Nitrogen circuits will tested according to the design maximum pressure. CSN2, September 22, 2015 Slide: 23 Requirements: mains, ventilation, heating, oxygen deficiency sensors, safety for tests, nitrogen gas (100 m 3 ). Step 21 – Pressure test of the Nitrogen circuit LAr pump LAr Filters GAr Filters LN2 pump Phase separator

24. Step 13 – Installation of electrical feedthroghs Install all the trays for the cables and optical fibers (power supply, HV distribution, PMTs, wires and CRT supply and readout, sensors and other equipment). CSN2, September 22, 2015 Slide: 24 Requirements: mains, ventilation, heating, crane. Step 22 – Installation of cables and optical fibers trays

25. Step 13 – Installation of electrical feedthroghs Electrical distribution cabinets, optical switches and other communication equipment and all connections to the apparatus, including HV, CRT, cabinets and cabling for cryogenics and safety sensors, will be put in place. Also compressed air for valves will be distributed. CSN2, September 22, 2015 Slide: 25 Requirements: mains, ventilation, heating, compressed air. Step 23 – External cabling LAr pump LAr Filters GAr Filters LN2 pump Phase separator Power Supplies R/O Electronics supply Cryo controls and supply Communication Cmp. Air

26. Step 13 – Installation of electrical feedthroghs All communications will be tested. R/O (wires, PMTs and CRT) electronics will be tested with test pulses. Electronic noise will be measured and mitigation actions will be taken, if needed. CSN2, September 22, 2015 Slide: 26 Requirements: mains, ventilation, heating, compressed air. Step 24 – Test comms and El. noise (Pre-commissioning-3) Power Supplies R/O Electronics supply Cryo controls and supply Communication Cmp. Air

27. Step 13 – Installation of electrical feedthroghs The cryogenic equipment will be operated (pumps cooled on by-passes). The control systems will be tested and validated. Electronic noise on the apparatus will tested at the same time. CSN2, September 22, 2015 Slide: 27 Requirements: mains, ventilation, heating, oxygen deficiency sensors, safety for tests, compressed air, LN2 dewar filled and operational, LAr dewar filled and operational. Step 25 – Blank test of cryo equipment (Pre-commissioning-4) LAr pump LAr Filters GAr Filters LN2 pump Phase separator Power Supplies R/O Electronics supply Cryo controls and supply Communication Cmp. Air LAr Storage Pre-Filter LN2 Storage

28. Step 13 – Installation of electrical feedthroghs CSN2, September 22, 2015 Slide: 28 Requirements: All readiness reviews passed. All equipment ready and operational. Argon circuit under high vacuum. Step 26 – Cold Commissioning Detailed document in preparation

29. Step 13 – Installation of electrical feedthroghs CSN2, September 22, 2015 Slide: 29 Each step of the installation has to be planned in a seamless way together with the main coordinators. Weekly meetings will be held to check the status of the planning. For each step we should identify: One or more responsible persons Dependencies Required resources Schedule Parallel activities and interferences All of this will constitute a contribution to one or more workpackages as defined in the next 15 days. Work implementation