CERN Accelerating science

`ceiling configuration'

Sketch of the layout of the underground cavern at IP1 of the LHC, featuring the \atlas experiment, and the PX14 and PX16 access shafts. The area highlighted in orange illustrates the potential ceiling configuration of the ANUBIS detector. In addition to the instrumented cavern ceiling, this configuration includes two discs covering the access shafts.

(a) Sketch showing the design of \proanubis metallic frame (in yellow) and its support structure. (b) The location and orientation of the \proanubis setup within the UX1 \atlas cavern.

(a) Sketch showing the design of \proanubis metallic frame (in yellow) and its support structure. (b) The location and orientation of the \proanubis setup within the UX1 \atlas cavern.

(a) The yellow \proanubis steel frame being populated with RPC integrated chambers at CERN's BB5 laboratory. (b) \proanubis after integration of on-detector services being lifted at BB5 for transport to IP1.

(a) The yellow \proanubis steel frame being populated with RPC integrated chambers at CERN's BB5 laboratory. (b) \proanubis after integration of on-detector services being lifted at BB5 for transport to IP1.

(a) \proanubis being lowered with the aid of a crane through the \atlas PX14 access shaft. (b) The final installation of \proanubis, along with the primary DCS and DAQ rack, on Level 12 Side A in the UX1 ATLAS cavern. The detector panels of \proanubis are approximately perpendicular to the line-of-sight towards the IP, which is roughly towards the bottom left corner of the picture.

(a) \proanubis being lowered with the aid of a crane through the \atlas PX14 access shaft. (b) The final installation of \proanubis, along with the primary DCS and DAQ rack, on Level 12 Side A in the UX1 ATLAS cavern. The detector panels of \proanubis are approximately perpendicular to the line-of-sight towards the IP, which is roughly towards the bottom left corner of the picture.

Schematic layout of the \proanubis experimental setup. The system comprises two interconnected parts: the underground UX1 ATLAS experimental cavern hosting the \proanubis detector and the primary DCS and DAQ rack, and the USA15 area hosting the secondary DAQ rack. The primary DCS and DAQ rack houses the CAEN SY4527 mainframe hosting LV and HV power supplies, the VME crates with a VME controller, TDCs, hardware trigger logic boards, and the timing, trigger, and control interface module for receiving the ATLAS central trigger processor clock. The secondary DAQ rack houses two servers providing backup and full operational redundancy in case of a primary server failure in the cavern. The experimental cavern and USA15 are linked via network switches operating on a dedicated private network to ensure continuous communication and remote control capability.

Schematic overview of the signal flow from the RPC readout to the final data acquisition stage. For clarity, the diagram shows only a subset of channels, which includes 32 \(\eta\) and 64 \(\phi\) channels of a single RPC detector; the same architecture applies to each of the six RPC detectors.

(a) The Power Distribution Unit installed on the backside of the primary DCS and DAQ rack, providing power to the major system elements through individually controlled channels. (b) The AnaGate CAN F4 interface used to remotely control the power state of the two VME crates. Three active CAN channels are identified by the red cables.

(a) The Power Distribution Unit installed on the backside of the primary DCS and DAQ rack, providing power to the major system elements through individually controlled channels. (b) The AnaGate CAN F4 interface used to remotely control the power state of the two VME crates. Three active CAN channels are identified by the red cables.

Schematic of the environmental monitoring system where a Raspberry Pi (labelled as Rpi) interfaces with two sensors, BME280 (ambient conditions) and SHT85 (gas conditions), enabling remote monitoring of conditions surrounding \proanubis.

(a) Schematic of the SHT85 sensor inside the gas line to monitor the conditions of the RPC gas mixture. (b) Installed configuration on the \proanubis setup.

(a) Schematic of the SHT85 sensor inside the gas line to monitor the conditions of the RPC gas mixture. (b) Installed configuration on the \proanubis setup.

Grafana panel displaying real-time ambient and gas conditions (temperature, relative humidity, and pressure) relevant for \proanubis performance monitoring over a period of two days.

Measured angular distribution of tracks from cosmic ray muon candidates in the local $yz$-plane of the \proanubis detector, compared with simulation.

First event rates recorded by the \proanubis detector during a $\sim$three day LHC beam commissioning period, showing a clear correlation between the \proanubis trigger rate and the instantaneous luminosity measured by the \atlas experiment.