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As part of its HL-LHC upgrade program, the CMS collaboration is replacing itsexisting endcap calorimeters with a high-granularity calorimeter (CE). The newcalorimeter is a sampling calorimeter with unprecedented transverse andlongitudinal readout for both electromagnetic and hadronic compartments. Due toits compactness, intrinsic time resolution, and radiation hardness, silicon hasbeen chosen as active material for the regions exposed to higher radiationlevels. The silicon sensors are fabricated as 20 cm (8") wide hexagonal wafersand are segmented into several hundred pads which are read out individually. Aspart of the sensor qualification strategy, 8" sensor irradiation with neutronshas been conducted at the Rhode Island Nuclear Science Center (RINSC) andfollowed by their electrical characterisation in 2020-21. The completion ofthis important milestone in the CE's R&D program is documented in this paperand it provides detailed account of the associated infrastructure andprocedures. The results on the electrical properties of the irradiated CEsilicon sensors are presented.

Neutron Irradiation and Electrical Characterisation of the First 8" Silicon Pad Sensor Prototypes for the CMS Calorimeter Endcap Upgrade