Cranes, crates and conveyances

Crates of foam insulation in front of ProtoDUNE-SP during cryostat installation. Photo: CERN

A December trip by the CERN cryostat design team to Fermilab for ICARUS provided an opportunity for discussions on the LBNF/DUNE Far Site interfaces, as well. Some outstanding issues require resolution within the next six months in order to advance the final Far Site facilities design.

“Every two or three months we get the LBNF and DUNE engineering people together to talk about interfaces,” said Jack Fowler, LBNF/DUNE Systems Engineer. At these meetings, he said, the different subproject members exchange their expectations and concerns, and learn what the other teams are actually doing.

According to LBNF Project Manager Elaine McCluskey, the December meeting generated lively discussions about painting the caverns to reduce dust, rethinking cranes in the chambers, and coordinating installation activities with the receipt and temporary storage of materials.

“The Far Site work is getting closer now, so we are taking every opportunity that we can to discuss the remaining items and agree on solutions,” said Fowler. A follow-up meeting is scheduled during the DUNE collaboration meeting at CERN in late January — after the participants complete their homework from the December meeting.

The Far Site Conventional Facilities group presented their current design to the detector, cryostat and cryogenics teams, who responded with some lessons learned from the ongoing ProtoDUNE work at CERN regarding equipment, space and scale.

In CERN’s EHN1 there is space for temporary storage. At SURF, space will be more of a challenge. Photo: CERN

“The sheer amount of material that will arrive at the Far Site is daunting,” said Fowler, using as an example the 400 crates — roughly 7 cubic meters each — of foam insulation arriving at CERN for the two ProtoDUNE cryostats, which will translate to about  5,000 crates per Far Detector module at SURF.

The team is still working out how to stage and move materials, how many people are expected to be underground during installation — and the associated ventilation requirements — and whether to employ an overhead crane, which is not in the current plan.

“We need to examine the possible solutions and find one or two that accommodate everybody’s needs,” he added. “Arup (the A/E firm for the Far Site facilities) will need these issues resolved to start its work on the final design.”