Latest Developments in Tomographic Research of Underground and Large Structures with Muographic Expertise, TRUST-ME

Abstract

The TRUST-ME project aims at validating a new application of MUon Survey Tomography based on Mi-
cromegas detector for Unreachable Sites Technology (MUST2) to address a societal challenge of increasing
importance: sustainable water management. This muon tracker, conceived and developed by the Labora-
toire souterrain `a bas bruit (LSBB), relies on a Micromegas readout plane with a thin time projection chamber
(TPC). A network of new generation muon trackers is being deployed to both survey groundwater in
aquifers near the LSBB and enhance the safety and operational efficiency of large structures, such as dams.
The resulting compact, high field-of-view detector is able to operate in harsh environments with challeng-
ing access and operational conditions. MUST2 is currently being deployed on a double dam system to
both characterize the detector and monitor the building and its surroundings. In parallel, the combined
use of photogrammetry and LIDAR is tested coupled with muography for the modeling of mid-sized tar-
gets. This publication details the upgrade of the MUST2 technology, with its new and improved features.
It presents the experimental configuration of the detector in a dam monitoring context, and an example of
LIDAR and photogrammetry support for muographic analyses.