Estimation of a Plasma Mirror Reflectivity of LFEX Laser and Relevant Results Using Electron Energy Spectrometers

Ozaki, T.; Miura, Eisuke; Kojima, Sadaoki; Arikawa, Yasunobu; Abe, Yoshio; Yamanoi, Kohei; Ikeda, Tomokazu; Ishii, Katsuhiro; Sunahara, Atsushi; Johzaki, Tomoyuki; Sawada, Hiroshi; Fujioka, Shinsuke; Sakagami, Hiroyuki; Kitagawa, Yoneyoshi; Mori, Yoshitaka

doi:10.1585/pfr.17.2404084

Cited by 1 publication

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“…Ponderomotive acceleration etc and TNSA assume that the deuterium ratio is the same here. From other experiments [14], the proportion of deuterium among the ions is about 80%, and the rest is primarily protons. Therefore, for ion heating, the value obtained from the neutron measurement caused by deuterium ions may be divided by 0.8.…”

Section: Ionsmentioning

confidence: 75%

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Hot electron and ion spectra on blow-off plasma free target in GXII-LFEX direct fast ignition experiment

et al. 2023

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Polystyrene deuteride shell targets with two holes were imploded by the Gekko XII laser and additionally heated by the LFEX laser in a direct fast ignition experiment. In general, when an ultra-intense laser is injected into a blow-off plasma created by the imploding laser, electrons are generated far from the target core and the energies of electrons increase because the electron acceleration distance has been extended. The blow-off plasma moves not only to the vertical direction but to the lateral direction against the target surface. In a shell target with holes, a lower effective electron temperature can be realized by reducing the inflow of the implosion plasma onto the LFEX path, and high coupling efficiency can be expected. The energies of hot electrons and ions absorbed into the target core were calculated from the energy spectra using three electron energy spectrometers and a neutron time-of-flight measurement system, Mandala. The ions have a large contribution of 74% (electron heating of 4.9 J and ion heating of 14.1 J) to target heating in direct fast ignition.

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Section: Ionsmentioning

confidence: 75%

“…Unfortunately, there is no ability to distinguish ion species. However, we can estimate the proton/deuteron ratio roughly by using the aluminum filter method [14].…”

Section: Methodsmentioning

confidence: 99%