Specifically Measurement Protections for High Voltage and High Power on Megajoule Laser

The "Laser Megajoule" (LMJ) in CEA/CESTA - Bordeaux is designed to deliver 240 laser beams and 7.5 kJ - 351 nm each to transmit 1.8 MJ on 0.3 mg Deuterium/Tritium encapsulated in gold micro-balloon. This project requires a carefully controlled energy, a high precision timing and extreme precisely positioned targets near the center of experiment chamber. This experiment will allow the complex physic understanding of inertial confinement fusion and high energy density. The result takes an active part in the validation of simulation program. One important challenge is to assure a good behavior of troublemaker and sensible components in a same working time. The main parts of LMJ spread on several typical areas with different levels of electromagnetic fields. This paper presents a description of nominal LMJ design, some specific results and the choice of electromagnetic field level for the future tests on components before their assembly in the building. For the all components, interfaces, cable and grounding system, the studies are established with results of "Line Integration Laser" (LIL), the first completed laser experiment, the tests of components in University of Rochester "Omega Laser", the industrial texts of normalization and simulation calculations.