Recent results on implosions directly driven at λ 0.26-μm laser wavelength

New diagnostics were implemented on the implosion experiments performed at LULI to improve our measurements of hydroefficiencies: neutron chronometry gives the time of emission of the fusion reaction products as measured from the peak of the laser pulse; thereby making it possible to correlate the neutron emission with X-ray emission. Core imaging, based upon a maximum entropy reconstruction technique, leads to core size determination and also is a promising diagnostic for wall nonuniformities induced by irradiation conditions. A simple model is developed to retrieve experimental spectra of α-particles. (author)