Sea campaign completed: 10 detection units in operation at ORCA!

November 22 – Excellent progress today, with the work finalized on the two detection units lately deployed: after a confirmation from the tests that both were ok, the unfurling was started of the two units. The launcher vehicles were safely recovered from the Castor; the ROV inspected both units after unfurling, confirming that both are in nominal configuration. A new functionality test was then performed from the shore station to ensure that both detection units work nominally.

As the sea condition rapidly degraded during the day, it was decided to quit the campaign. The remaining detection units on deck will be saved for next time.

The final outcome of the campaign is: ORCA enlarged from 6 to 10 detection units!

The KM3NeT Collaboration is grateful to the heroic teams who have made such great effort onboard the two ships and in the shore station, as well as to all institutes which contributed to the construction of the detection units. We look forward to the next deployment campaign. Having said that: it’s time to resume data taking with an enlarged ORCA-10 now!

Approaching the ORCA submarine junction box at 2,500 m depth – in the foreground is the connector that the ROV is preparing to plug on it.
The team onboard the Janus – on one of the screens is the sonar image of the ORCA telescope, showing the nodes and the detection units on the sea floor. Note that the operation was performed respecting all applicable rules for protection against COVID-19 – the team got so close together only for the purpose of the picture.
The team onboard the Castor showing the ’10’ sign in front of a recovered launcher vehicle.
The onshore team. The featured instrument is an Optical Spectrum Analyser, showing the signals of the 10 detection units of ORCA. Note that the operation was performed respecting all applicable rules for protection against COVID-19 – the team got so close together only for the purpose of the picture.