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Since two decades, laser-driven neutron emissions are studied as theyrepresent a complementary source to conventional neutron sources, with furthermore different characteristics (i.e. shorter bunch duration and higher numberof neutrons per bunch). We report here a global, thorough characterization ofthe neutron fields produced at the Apollon laser facility using the secondarylaser beam (F2). A Double Plasma Mirror (DPM) was used to improve the temporalcontrast of the laser which delivers pulses of 24 fs duration, a mean on-targetenergy of ~10 J and up to 1 shot/min. The interaction of the laser with thintargets (few tens or hundreds of nm) in ultra-high conditions produced enhancedproton beams (up to 35 MeV), which were then used to generate neutrons via thepitcher-catcher technique. The characterization of these neutron emissions ispresented, with results obtained from both simulations and measurements usingseveral diagnostics (activation samples, bubble detectors and Time-of-Flightdetectors), leading to a neutron yield of ~$4.10^{7}$ neutrons/shot. Similarneutron emissions were observed during shots with and without DPM, while fewerX-rays are produced when the DPM is used, making this tool interesting toadjust the neutrons/X-rays ratio for some applications like combinedneutron/X-ray radiography.

A Comprehensive Characterization of the Neutron Fields Produced by the Apollon Petawatt Laser