Metrology of Acquisition Chains and Signal Processing of LMJ Experiments

Since the first experiment in 2014, more and plasma diagnostics are being deployed on Laser MegaJoule (LMJ) facility manufactured by C.E.A/D.A.M. These aim at measuring radiations or particles emitted during laser experiments to study high-energy physics, especially inertial confinement fusion (ICF). Different types of sensors surround LMJ target chamber realize conversion quantities interest an electric signal. The signal is then transmitted via coaxial cables, acquired a broadband oscilloscope, digitally post-processed. Each step this typical acquisition chain adds measurement errors increases global uncertainty. First, numerical model digitizer alongside specific hardware system designed perform its metrology situ will be presented. It computes sources such as offset, gain skew, provides effective number bits (ENOB) digitizer. experimental characterization electrical transfer function also detailed. Finally, methods handle inverse problem, based deconvolution processes, introduced, including future developments exploiting Bayesian inferences statistical approaches.