Target Diagnostic Systems for Proton, Electron, and X-rayGeneration Experiments Based on Ultraintense Laser-TargetInteractions

Choi, I. W.; Kim, HyungTaek; Hafz, N.; Yu, Tae-Jun; Sung, J. H.; Ku, Lee; Kim, Chul-Min; Kim, IJong; Noh, Young‐Chul; Ko, Do‐Kyeong; Lee, Jongmin

doi:10.3938/jkps.55.517

Cited by 7 publications

(2 citation statements)

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“…The laser pulse was focused with an f/3 off-axis parabolic mirror (focal length of 600 mm) with an incidence angle of 30° with respect to the target normal. The focal spot shape was characterised with a high-magnification focal spot monitoring system [28]. A typical spatial distribution of the focal spot is shown in the inset of figure 4.…”

Section: Enhanced Laser-ion Acceleration In Dltsmentioning

confidence: 99%

Development of foam-based layered targets for laser-driven ion beam production

Prencipe

Sgattoni

Dellasega

et al. 2016

Plasma Phys. Control. Fusion

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We report on the development of foam-based double-layer targets (DLTs) for laser-driven ion acceleration. Foam layers with a density of a few mg cm −3 and controlled thickness in the 8-36 μm range were grown on μm-thick Al foils by pulsed laser deposition (PLD). The DLTs were experimentally investigated by varying the pulse intensity, laser polarisation and target properties. Comparing DLTs with simple Al foils, we observed a systematic enhancement of the maximum and average energies and number of accelerated ions. Maximum energies up to 30 MeV for protons and 130 MeV for C 6+ ions were detected. Dedicated three-dimensional particle-in-cell (3D-PIC) simulations were performed considering both uniform and clusterassembled foams to interpret the effect of the foam nanostructure on the acceleration process.

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Section: Enhanced Laser-ion Acceleration In Dltsmentioning

confidence: 99%

Development of foam-based layered targets for laser-driven ion beam production

Prencipe

Sgattoni

Dellasega

et al. 2016

Plasma Phys. Control. Fusion

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“…The p-polarized laser pulse whose central wavelength is ~800 nm irradiated a solid target at an incidence angle of 45°. Minimum focal spot size of ~4 µm was obtained using an off-axis parabolic mirror with an f-number of 3.4 [25]. The laser system stably delivers laser pulses with a duration shorter than 35 fs and an energy of ~0.8 J on target, giving a peak irradiance of ~5 × 10 19 W cm −2 at the tight focus position of the laser beam.…”

Section: Methodsmentioning

confidence: 99%

Projection imaging with directional electron and proton beams emitted from an ultrashort intense laser-driven thin foil target

Nishiuchi

Choi

Daido

et al. 2014

Plasma Phys. Control. Fusion

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Projection images of a metal mesh produced by directional MeV electron beam together with directional proton beam, emitted simultaneously from a thin foil target irradiated by an ultrashort intense laser, are recorded on an imaging plate for the electron imaging and on a CR-39 nuclear track detector for the proton imaging. The directional electron beam means the portion of the electron beam which is emitted along the same direction (i.e., target normal direction) as the proton beam. The mesh patterns are projected to each detector by the electron beam and the proton beam originated from tiny virtual sources of ~20 µm and ~10 µm diameters, respectively. Based on the observed quality and magnification of the projection images, we estimate sizes and locations of the virtual sources for both beams and characterize their directionalities. To carry out physical interpretation of the directional electron beam qualitatively, we perform 2D particle-in-cell simulation which reproduces a directional escaping electron component, together with a non-directional dragged-back electron component, the latter mainly contributes to building a sheath electric field for proton acceleration. The experimental and simulation results reveal various possible applications of the simultaneous, synchronized electron and proton sources to radiography and pump-probe measurements with temporal resolution of ~ps and spatial resolution of a few tens of µm.

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