Perpendicular and tangential angularly resolved multi-sight neutral particle analyzer system in LHD

Ozaki, T.; Veshchev, E.; Ido, T.; Shimizu, A.; Goncharov, P. R.; Sudo, S.

doi:10.1063/1.4742925

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…The LFEX laser is injected toward the center of through the plasma mirrors near the target. Hot electrons are measured by three electron energy spectrometers (ESM) [8]. The three ESMs are installed, behind the two plasma mirrors on the opposite side of the LFEX, 20.9 degrees (from the LFEX traveling direction, p43) and the sides perpendicular to the LFEX, 90 degrees (p34 and p35) (Fig.…”

Section: Methodsmentioning

confidence: 99%

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

Ozaki

Miura

Kojima

et al. 2022

Plasma and Fusion Research

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In the counter-irradiation, which is one of the fast ignition schemes, higher core energy coupling can be expected when there are two hot electron flows in counter directions. Two plasma mirrors were installed for the counter irradiation at about 180 degrees. The hot electron effective temperatures (T eff ) were measured by using electron energy spectrometers. T eff vs the laser intensity on a foil target followed Wilkes' scaling law. The energy incident on the target could be calculated by estimating the laser intensity on the target from T eff and estimating the focusing radius from the X-ray pinhole camera image. As a result, the reflectivity could be estimated to be 17 ± 3%.

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Section: Methodsmentioning

confidence: 99%

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

Ozaki

Miura

Kojima

et al. 2022

Plasma and Fusion Research

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“…can be expected when the LFEX heats the imploded core. Measurements of the hot electron and ion, and the neutron are conducted using an electron spectrometer (ESM) [9] and a Mandala time-of-flight neutron detection system [10] Three ESMs are installed at 0, 20.9 and 70.5 degrees against the LFEX direction. ESM can measure the electron spectra from 0.5 MeV to 120 MeV and protons or deuterium ions until 7 MeV.…”

Section: Methodsmentioning

confidence: 99%

Hot Electron and Ion Spectra in Axial and Transverse Laser Irradiation in the GXII-LFEX Direct Fast Ignition Experiment

Ozaki

Abe

Arikawa

et al. 2021

Plasma and Fusion Research

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An electron spectrometer was used to measure the electron and ion spectra in two different irradiations of implosion laser to the deuterated spherical shell targets at the direct fast ignition experiments on the Gekko-LFEX facility. In the transverse irradiation against the LFEX laser axis, the low effective hot electron temperature (T eff ) and huge neutron yield (Ny) could be obtained although high T eff and low Ny could be observed in the axial irradiation. In the transverse irradiation, the efficient core heating could be obtained because the laser-plasma interaction position is close to the core and the diffusive/ion drag heating may be effective.

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“…The electron-ion energy spectrometer (ESM) [8] and the Mandala neutron time-of-flight analyzer (Mandala) [9] are used to estimate the deposited energy of electrons and ions, which contribute to the heating. The results are compared with the absorbed energy obtained from areal density (ρR) and x-ray measurement [10].…”

Section: Introductionmentioning

confidence: 99%

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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Perpendicular and tangential angularly resolved multi-sight neutral particle analyzer system in LHD

Cited by 6 publications

References 9 publications

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

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

Hot Electron and Ion Spectra in Axial and Transverse Laser Irradiation in the GXII-LFEX Direct Fast Ignition Experiment

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

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