The CTA+ project foresees the enhancement of the Cherenkov Telescope Array Observatory
(CTAO) Southern Site to be constructed at Paranal, Chile. The project aims at increasing the
number of telescopes included in the base CTA configuration, called “alpha” configuration.
In particular, 2 Large Sized Telescopes (LSTs) and 5 Small Sized Telescopes (SSTs) will be
manufactured and tested to be ready for the installation in the CTAO site in order to expand the
alpha configuration. In addition, a R&D program is foreseen to improve the technology for a
future upgrade of the CTAO southern site. CTA+ aims at developing sensors for a high-resolution
Cherenkov camera to upgrade the current camera designs. Silicon Photomultipliers (SiPMs) with
a very high sensitivity in the Near Ultraviolet (NUV) wavelength range, compatible with the
Cherenkov emission spectrum, and low correlated noise will be employed. In addition, the R&D
program includes specific developments of the Through-Silicon-Via technology, which allows for
a compact packaging of the sensors and the minimization of dead spaces among pixels. We present
here an overviewof the CTA+ project, aswell as the preliminary characterization of SiPMs recently
developed by Fondazione Bruno Kessler (FBK), showing excellent photon detection efficiency in
the NUV range and very low correlated noise.