Advancing Radiation Hardness Assurance at CERN: Improved HEH Sensor for Enhanced Radiation Monitoring and Reliability System Study

In the Large Hadron Collider (LHC), it is essential to provide repeatable High Energy Hadron (HEH) measurements with reduced uncertainty to accurately track HEH trends as a function of machine operations and tunnel configurations. This level of precision is crucial not only for understanding the machine’s behaviour, but also for defining radiation qualification requirements for systems installed in the accelerator. However, the CY62157EV30 (CY90), which is currently used as an HEH sensor in the RadMon system, exhibits significant variability in its measurements. This high uncertainty prevents effective trend identification, and safety margins of up to a factor of 10 should be applied when defining radiation requirements. By contrast, the CY62167GE30 (CY65) offers significantly lower intra-lot uncertainty and improved radiation performance, making it a promising alternative to the CY90. This work validates the measurements obtained using the CY65 and highlights the benefits its use would bring to the LHC and its operational reliability.