Ultrahigh-contrast kilojoule-class petawatt LFEX laser using a plasma mirror

Arikawa, Yasunobu; Kojima, Sadaoki; Morace, A.; Sakata, Shohei; Gawa, T.; Taguchi, Yuki; Abe, Yuki; Zhang, Zhe; Vaisseau, X.; Lee, Seung Ho; Matsuo, Kazuki; Tosaki, S.; Hata, Masayuki; Kawabata, Koji S.; Kawakami, Yuhei; Ishida, Masato; Tsuji, K.; Matsuo, S.; Morio, N.; Kawasaki, T.; Tokita, Shigeki; Nakata, Yoshiki; Jitsuno, Takahisa; Miyanaga, Noriaki; Kawanaka, Junji; Nagatomo, Hideo; Yogo, Akifumi; Nakai, M.; Nishimura, Hiroaki; Shiraga, H.; Fujioka, Shinsuke; Azechi, H.; Sunahara, A.; Johzaki, Tomoyuki; Ozaki, T.; Sakagami, Hiroyuki; Sagisaka, A.; Ogura, Koichi; Pirozhkov, Alexander S.; Nishikino, Masaharu; Kondo, Kiminori; Inoue, Shunsuke; Teramoto, Kensuke; Hashida, Masaki; Shimizu, Shuji

doi:10.1364/ao.55.006850

Cited by 35 publications

(19 citation statements)

References 23 publications

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“…Here we report ion acceleration by high-contrast ps pulses obtained from one of the most powerful laser facilities in the world: LFEX 44 45 of Osaka University. LFEX simultaneously delivers four laser beams with a full width at half maximum (FWHM) pulse duration of 1.5 ps.…”

Section: Resultsmentioning

confidence: 99%

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Boosting laser-ion acceleration with multi-picosecond pulses

Yogo

Mima

Iwata

et al. 2017

Sci Rep

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Using one of the world most powerful laser facility, we demonstrate for the first time that high-contrast multi-picosecond pulses are advantageous for proton acceleration. By extending the pulse duration from 1.5 to 6 ps with fixed laser intensity of 1018 W cm−2, the maximum proton energy is improved more than twice (from 13 to 33 MeV). At the same time, laser-energy conversion efficiency into the MeV protons is enhanced with an order of magnitude, achieving 5% for protons above 6 MeV with the 6 ps pulse duration. The proton energies observed are discussed using a plasma expansion model newly developed that takes the electron temperature evolution beyond the ponderomotive energy in the over picoseconds interaction into account. The present results are quite encouraging for realizing ion-driven fast ignition and novel ion beamlines.

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Section: Resultsmentioning

confidence: 99%

“…Details regarding the LFEX laser system can be found in refs 44 and 45 . The ion energy spectra were observed using a TP employing a permanent dipole magnet (0.85 T) and a pair of copper electrodes (12.5 kV/cm).…”

Section: Methodsmentioning

confidence: 99%

Boosting laser-ion acceleration with multi-picosecond pulses

Yogo

Mima

Iwata

et al. 2017

Sci Rep

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“…The only contribution to the laser pedestal is then constituted by the amplified optical parametric fluorescence from the front-end OPCPA, which amplitude is proportional to the total laser energy on target, therefore by keeping constant total laser energy we expect to have very similar pre-formed plasma conditions for single and multiple beamlet irradiation in the experiment. The LFEX contrast was recently improved by the addition of two saturable absorbers in the 3-stage OPCPA and slowly rises from 10 10 at t = − 3 ns to 10 9 up to at t = −150 ps and exponentially increasing afterwards up to 10 4 right before the main pulse arrival 33,34 . With a peak output intensity of ~1 × 10 19 W/cm 2 this contrast level allows to successfully shoot thin foils (3–10 μm) generating bright TNSA ion sources.…”

Section: Methodsmentioning

confidence: 99%

Enhancing laser beam performance by interfering intense laser beamlets

et al. 2019

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Increasing the laser energy absorption into energetic particle beams represents a longstanding quest in intense laser-plasma physics. During the interaction with matter, part of the laser energy is converted into relativistic electron beams, which are the origin of secondary sources of energetic ions, γ-rays and neutrons. Here we experimentally demonstrate that using multiple coherent laser beamlets spatially and temporally overlapped, thus producing an interference pattern in the laser focus, significantly improves the laser energy conversion efficiency into hot electrons, compared to one beam with the same energy and nominal intensity as the four beamlets combined. Two-dimensional particle-in-cell simulations support the experimental results, suggesting that beamlet interference pattern induces a periodical shaping of the critical density, ultimately playing a key-role in enhancing the laser-to-electron energy conversion efficiency. This method is rather insensitive to laser pulse contrast and duration, making this approach robust and suitable to many existing facilities.

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“…The 10 19 cm −3 SPD or SPD densities allow new applications: the demonstration and study of polarized laser fusion [13,17] using several >5 kJ pulses offered at several laser facilities [10][11][12]; polarized ion acceleration with SPH densities of 10 19 − 10 21 cm −3 for wavelengths of 10-1 µm, respectively; maximizing the production of spin-polarized molecules in the NMR detection volume, for signal enhancement requiring gas densities of >10 19 cm −3 .…”

mentioning

confidence: 99%

“…Polarized laser fusion, using densities of at least 10 19 SPD cm −3 and 10 20 cm −3 of polarized 3 He, and at least 5 kJ/pulse focused to ∼10 µm [10][11][12], will yield well above 10 4 neutrons for the D-3 He and D-D fusion reactions, needed for polarized fusion studies; well above 10 6 neutron will be produced using the 2MJ/pusle NIF laser [13].…”

mentioning

confidence: 99%

Ultrahigh-Density Spin-Polarized H and D Observed via Magnetization Quantum Beats

et al. 2018

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We measure nuclear and electron spin-polarized H and D densities of at least 10^{19} cm^{-3} with ∼10 ns lifetimes, from the photodissociation of HBr and DI with circularly polarized UV light pulses. This density is ∼6 orders of magnitude higher than that produced by conventional continuous-production methods and, surprisingly, at least 100 times higher than expected densities for this photodissociation method. We observe the hyperfine quantum beating of the H and D magnetization with a pickup coil, i.e., the respective 0.7 and 3 ns periodic transfer of polarization from the electrons to the nuclei and back. The 10^{19} cm^{-3} spin-polarized H and D density is sufficient for laser-driven ion acceleration of spin-polarized electrons, protons, or deuterons, the preparation of nuclear-spin-polarized molecules, and the demonstration of spin-polarized D-T or D-^{3}He laser fusion, for which a reactivity enhancement of ∼50% is expected.

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Ultrahigh-contrast kilojoule-class petawatt LFEX laser using a plasma mirror

Cited by 35 publications

References 23 publications

Boosting laser-ion acceleration with multi-picosecond pulses

Boosting laser-ion acceleration with multi-picosecond pulses

Enhancing laser beam performance by interfering intense laser beamlets

Ultrahigh-Density Spin-Polarized H and D Observed via Magnetization Quantum Beats

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