From screwdrivers to cranes, the ProtoDUNE-SP team and CERN staff hammered out all the important detector installation details in an intensive three-day workshop at CERN in late April, organized by Roberto Acciarri and Filippo Resnati, who coordinates the ProtoDUNE activities in ENH1.
High on the list of topics was the installation sequence. The participants scrutinized the baseline installation plan, looking for ways to increase efficiency and TPC component safety.
The process of cabling the APAs emerged as a candidate for improvement. The 0.7-m diameter manhole in the top of the cryostat limits access for this job — which requires people to work at elevations over six meters inside the cryostat — to a single-person man-lift. This in turn requires a scaffolding system that must be reconstructed each time it is moved, slowing the installation process.
“We continue to search for other possible means of access for the high-elevation work,” said Bill Miller, the installation team leader. “During the workshop we also discussed how to vary the sequence of installation for TPC components in case we need to wait on other parts.”
The right people were in the room to determine how to ensure that the right people arrive at CERN at the right time, get the right training, get access to the right equipment, follow the right procedures, and use the spaces and equipment during the right intervals.
Acciarri said that collaboration between groups has been and continues to be strong and effective. He found the quality of the talks at the workshop to be high, demonstrating people’s dedication to the project, and facilitating the decision-making process.
“From quality tests on parts to DAQ requirements for the test phase, several important decisions were taken,” said Acciarri. “For example, we defined a survey plan for the detector and its components, and finalized the path for the external cables.”
Miller and Curt Lerol (deputy installation team leader), who have led the trial assembly effort at Ash River, will hold weekly coordination meetings with Acciarri, Resnati, and the critical TPC component coordinators.
“It’s important that everyone know what work is scheduled for each week,” said Miller.
Jolie Macier, the U.S. DUNE project manager, attended the workshop to make sure that the costs and all the “moving parts” were properly addressed.
“Lots of people and equipment will be showing up at CERN, and coordination is really important,” Macier said. “CERN is providing services, space and people for this. We now understand their expectations and they understand our needs.”