ProtoDUNE-DP proceeding toward construction

3D view of the ProtoDUNE-DP showing 3 out of the 4 Charge Readout Planes (top), an open view of the field cage (sides) and the cathode with the photomultipliers for the light readout system (bottom)

The ProtoDUNE-DP Technical Design Review that took place 24-25 April at CERN was a “non-trivial exercise” for the review committee, according to Dario Autiero, one of the project coordinators. After examining the entire detector design, the committee declared the technical design to be “well advanced” and supported “proceeding toward construction.”

“The committee appreciated the impressive amount of work done by the ProtoDUNE-DP team in preparation for this Review,” the committee’s report begins. Preparation for the review had clearly required a non-trivial exercise by the project team, as well.

The detector systems have reached an advanced state, helped by the experience gained over the last two years in preparing and assembling the 3x1x1 pilot detector. It is a predecessor to the 6x6x6 ProtoDUNE-DP, built with the same dual-phase technology.

“The 3x1x1 pilot has also helped us to develop solid strategies for cost assessment and procurement,” said Autiero.

The commissioning of the detector systems, the monitoring systems, the gas purge and purity measurements, and the online storage/processing system has all been “conformal to expectations and very fruitful,” according to Autiero. Putting the 1x1x3 into operation, however, is delayed due to problems that have arisen in the cryogenics system and the cryostat insulation.  The CERN team is working hard to ensure that these problems do not occur for the two ProtoDUNEs.

An updated construction schedule for the 6x6x6 ProtoDUNE-DP detector takes into account the final adjustments to the design, the precise installation sequences, the availability of the infrastructure, and the procurement schedule.

3D view of the ProtoDUNE-DP integrated into the cryostat, including the penetrations in the cryostat roof, the cryogenics piping, the cable trays in the cryostat corners and the corrugated membrane on the floor.

Prior to the review, production had already begun for the front-end and DAQ electronics, the slow control system, the light-readout system, the high-voltage system and the cosmic ray trigger planes. Construction activities are now in progress for the charge readout planes, field cage and cathode. Installation of the beamline and its instrumentation has also started.

“We would like to thank the members of the review committee for their intensive work and their careful consideration of all the aspects of the project,” said Autiero. “The discussions at the review were very lively and constructive. “

DUNE international project manager Steve Kettell also thanked the review team, recognizing in particular their insights into aspects of the design that merit extra caution and their observation that “given the current schedules, tradeoffs between ProtoDUNE-DP construction and 3x1x1 operations will need to be carefully weighed.”