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FASER LS2 work coordination meeting
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Europe/Zurich
112/2-023 (CERN)
Present: Jonathan Gall, Liam Andrew Dougherty, Yann Maurer, Jamie Boyd, Brian Petersen, Alberto Rigamonti, Maria Papamichai, Marzia Bernardini, Francesco Sanchez Galan
Introduction (Jamie Boyd):
- The power requirements for the FASER experiments has been updated since the TP. It still looks ok to use a 400V, 16 A main breaker even with some headroom. Yann asked if the chillers needed single-phase or 3-phase power and after the meeting it was confirmed that only single phase is used, but given their consumption, each chiller will need its own 10 A circuit.
- It was foreseen by FASER to have a local UPS for powering the most critical component as pulling UPS power from USA15 would be prohibitively expensive. HSE has in principle agreed to this, but EN-EL experts are opposed, so FASER experts are re-evaluating the experiment needs. A dedicated discussion with relevant EN-EL and FASER experts will be arranged.
- For the chillers, confirmation is still being sought from EN management whether EN-CV can take responsibility for installation and maintenance. FASER have asked EN-CV, if proposed chiller configuration is acceptable to EN-CV, awaiting response before starting procurement, and given long lead times this becomes urgent (approval was received from Olivier after the meeting).
- Most cables will be produced by EP-DT and will therefore be safety compliant. A derogation has been requested for tracker signal cables, but is still pending. Cable trays, and routing, for the experiment are being worked out in more detail.
- Jamie had discussed with Anne-Laure what needs to be updated in the LHC layout database. This is not a high priority and could be done in early 2020 where more support would be available. There is conflicting information regarding whether a MADX file created from an updated layout database is needed for survey team. A follow-up with survey experts will be done, possibly in a TREX meeting after the summer holidays.
- Liam noted that the WP1 changes will be registered after the work has been finished.
WP1 (Liam Andrew Dougherty, Francesco Sanchez Galan, Maria Papamichai):
- The new passarelle has been checked for blockage of survey lines and one metal plate will need to be removed.
- The integration work is continuing and it was discussed whether some cabling work for the patrol and electricity could be done during the summer. Since
this would involve drilling outside the SAS, Marzia proposed to postpone this in order not disturb the DISMAC campaign which has an open interconnect
very close by. Yann and Maria confirmed that delaying this to later should be fine.
- Compress air is still planned to be installed during the stop on July 23 and includes installing piping up until the TI12 entrance.
- It had been proposed by Serge di Luca to move the patrol box at the back of TI12 to the front. This will need to be checked with Christelle Gaignant (BE-DSO) and presented in the ICL meeting by Liam.
- The plan for the deinstallation work over the summer is unchanged and almost all work confirmed. The hoist installation will have to be delayed as it is not ready, but there are plenty of possible periods where this could be installed and it likely not needed until January (TBC if this is needed for transporting out disassembled components).
- The passarelle and SAS will be installed next week. Liam and Yann confirmed that a ground scan had been done to ensure the drilling needed for the passarelle would not hit anything. (For the QRL protection it is under discussion if the middle support needs to be attached to the ground, as this clashes with the underground HV cable).
- Since vacuum experts had raised concern regarding dust during the ECR circulation, Marzia asked that document of the dismantling procedures (including transport of equipment out of TI12) be circulated through Sami/Anne-Laure to ensure these are acceptable to all affected parties.
- It was asked how and when the waste would be removed. This was not clear and will be followed up by Francesco.
- Power will be needed for the SAS ventilation and light, but Yann pointed out existing power outlets nearby that can be used.
- Maria showed the cabling removal work that EN-EA-AS will carry out in agreement with EN-EL.
- The ECR for WP1 will be circulated very soon (if this document is the same as the dismantling procedure document mentioned above needs to be clarified)
WP2 (Jonathan Gall):
- The design basis for the trench has been agreed with ARUP and the design is on-going.
- An open question is on the loading for transport. This has been forwarded to Caterina Bertone. Liam also noted that the actual position of the crane support in TI12 might have changed from initial drawings and will need to be checked.
- It was attempted to inspect the drainage by accessing TI12 from the SPS side, but this was prevented by a locked door. What was visible of the drainage does not appear to have been cleaned since construction. A cleaning procedure will need to be worked out given the poor access from the SPS side, but this is outside the FASER WP.
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