Abstract
RLCYC 75 is a new electrically calibrated laser calorimeter especially manufactured by Laser Métrologie to calibrate energy diagnostics of Laser MegaJoule (LMJ). It consists of an optical cavity cooled by a hydraulic system. The system is designed to provide laser power measurements with uncertainty less than 1% at 2kW and traceability to the International System of Units (SI) thanks to electrical calibrations. In this paper, a 3D thermal model is developed to study the thermal equivalence between electrical calibration and optical measurement. The simulation results are crossed with PT100 measurements in order to validate the model. The thermal modelling of the RLCYC 75 calorimeter is a key point to analyse the calorimeter efficiency, thus this work validates the geometrical design of RLCYC 75 calorimeter.
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