Protection of the superconducting circuits of the High Luminosity Upgrade of the LHC project (HL-LHC) will be ensured by a new generation of quench detection systems and various quench protection systems for the superconducting circuits and magnets. The HL-LHC quench detection systems serve as well as high-performance data acquisition systems, that also provide essential input for the automatic analysis of events such as a superconducting magnet quench. The supervision of the quench protection systems required the development of data acquisition and monitoring systems adapted to the specific characteristics of this equipment. Of particular importance are the protection device supervision units (PDSU), which are monitoring and interlocking the quench heater circuits and the Coupling Loss Induced Quench (CLIQ) systems. All data acquisition and monitoring systems use Ethernet-based communication with precise timing instead of a classic serial fieldbus solution. This approach ensures the required data transfer rates and time synchronisation. The contribution will discuss the specific functional requirements, the status of development and the results of extensive system validation testing. It will also report on the system integration and the preparation for the first deployment in the upcoming IT-String project.

The Beam Interlock System (BIS) is the backbone of the machine protection system in CERN’s accelerator chain, ensuring that the beams are safely transported through the injector chain and circulated in the Large Hadron Collider. A new version of the BIS is currently under development and planned to be deployed in the SPS, LHC and the North Area experimental zone during the Long Shutdown 3 (LS3), while the recently installed BIS in LINAC4 and the PSB will remain in place. As a result, the current and the new system will be operated in parallel, and it is primordial that both systems can be supervised and monitored in the same way by the operation crews, the system experts, and reliability engineers. Consequently, it is planned to provide a data service with a unique API for both systems. This data service will leverage UCAP and chain transformations to expose data for anyone to consume, and to be logged as time series in NXCALS. This paper recalls the current implementation of the BIS supervision. It then presents the solution that was developed with UCAP and the benefits of the chain of transformations. It then reviews the performance and limitations of this implementation, and details the future plans.

The Quench Protection System (QPS) of the LHC is crucial for integrity of the superconducting circuit elements. It also plays an important role in the acquisition of data from the circuit elements during the magnet qualification, equipment commissioning and accelerator operation. The new superconducting circuits for the HL-LHC era, which will be assembled and operated for a first time in the IT String facility, require finer and more comprehensive measurements during all of these steps. The required data throughput cannot be achieved with the current QPS data acquisition technology. Therefore, a new data acquisition stack called EDAQ has been developed to address this issue and provide further improvements, including accurate timing synchronisation down to the individual field agents. This contribution presents the technologies chosen for this new stack, their additional benefits, their assembly into a robust and high-performance prototype, its integration into the existing controls environment and the ongoing validation in successive steps towards the HL-LHC installation.