June activities in EHN1

The temporary construction opening (TCO) in NP04 (single-phase) and the 10-m-high clean room ceiling as of June 15. The opening in the ceiling is for entry of the cryostat insulation panels, primary membrane and cold box. (Click image for larger view.) Photo: F.Resnati

CERN staff, contractors, and visiting collaborators are very busy this month in EHN1, where the two ProtoDUNEs are housed.

After carefully crafting the procedures for installing the insulation panels for ProtoDUNE-SP, the companies GTT and Gabadi are finishing this critical work. When they are done, they will start welding the corrugated primary membrane.

Another company, Clauger, has completed the walls and roof of the clean room, and this week ACMP is installing the rail system for bringing the APAs and the CPAs into the clean room. Very soon, CERN staff and contractors will install the two buffer areas (called sas), one each for the materials and people.

CERN’s Dimitar Mladenov recently redesigned the cold box needed for testing the APAs before the insertion in the single-phase cryostat. Just last week CERN technicians started the welding and assembly of its walls, under Mladenov’s supervision. Once the external structure is complete, Andrea Zani (CERN) and Roberto Acciarri (Fermilab) will be responsible for the installation of the inner insulation layer, while David Montanari (Fermilab) will coordinate the installation of the cryogenics system that will cool the box down to the operating temperature of 150K.  The cold box is being assembled outside the clean room — the CERN transport team will have to bring this large and heavy object inside in one piece.

Giovanna Lehmann Miotto (CERN), Karol Hennessy (Liverpool) and their team along with CERN contractor uSystem set up the 18 cooled racks for DAQ and computing in the computing barracks. Nectarios Benekos, also of CERN, installed  about 260 nodes in 12 of these racks and is currently configuring them. Meanwhile, Miotto, Geoff Savage (Fermilab), Dario Autiero (Lyon), and others are populating the six racks in a separate barrack dedicated to the DAQ and storage.

Linda Bagby and Theresa Shaw of Fermilab spent a week at CERN to meet with CERN engineers and resolve any remaining electrical safety issues, and to do a test installation of the ProtoDUNE-SP Impedance Monitor prior to its installation in late July.

“Xavier Pons played a critical role in helping us get the mechanical and electrical installation completed, and Filippo Resnati spent late nights and early mornings with us to commission the test,” said Shaw.  They also ran a calibration procedure on the Impedance Monitor, and report that it appears to work well and should be a useful instrument for understanding the state of the detector ground.

David Montanari’s team at CERN has installed the first element of the cryogenics system in NP04. It is a delicate valve that will be welded to the primary membrane. Insulation will be installed around it.

The CERN transport team is in the process of positioning the concrete blocks that make up the floor where the beamline and a variety of other infrastructure will be installed. This is a major activity!

Gerard Cumer, who coordinates the infrastructure in the building, is making sure that everything — cabling, electricity, network, cooling, ventilation – is progressing quickly and well so that everyone can get their work done. Olga Beltramello, Letizia di Giulio and John Etheridge are ensuring that everyone is working safely in this high-activity site.

Thank you to Fillipo Resnati and Roberto Acciarri who provided information for this article.