The new Laser M�gajoule (LMJ) facility at CEA/CESTA center near Bordeaux in France will illuminate its first target at the end of 2014. As the present NIF facility at Livermore (CA), the LMJ will be partly devoted to studying Inertial Confinement Fusion (ICF) of DT mixtures by laser implosion. Diagnostics that record escaping fusion neutrons are of primary importance in understanding the internal conditions of thermonuclear plasma such as density, core temperature, imploding velocities, target shape and dimensions during the implosion. For many years many experiments have been conducted on the OMEGA laser facility because of its ability to produce large bursts of thermonuclear DT, DD, TT, and D3He neutrons which provided a unique capability to test our neutron diagnostics measurements principles on this reduced but sufficient scale in neutron yield. A range of diagnostics have been developed including neutron time of flight (nToF) spectrometer (DEMIN), neutron imaging (NIS), and Doppler broadening measurements by fast photoconductors (SNANED).  The main characteristics of the LMJ facility will be presented with a summary of the present and future LMJ neutron diagnostics suite designed for measuring the escaping neutrons flux. DEMIN spectrometer, neutron core imaging, Yield, and ion temperature diagnostics developments will be discussed in detail.

Present developments of the LMJ neutron diagnostics

248th National Meeting (2014)

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