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