Magnetized fast isochoric laser heating for efficient creation of ultra-high-energy-density states

Sakata, Shohei; Lee, Seungho; Morita, Hiroki; Johzaki, Tomoyuki; Sawada, Hiroshi; Iwasa, Yuki; Matsuo, Kazuki; Law, King Fai Farley; Yao, Akira; Hata, Masayuki; Sunahara, A.; Kojima, Sadaoki; Abe, Yuki; Kishimoto, H.; Syuhada, Aneez; Shiroto, Takashi; Morace, A.; Yogo, Akifumi; Iwata, N.; Nakai, M.; Sakagami, Hiroyuki; Ozaki, T.; Yamanoi, Kohei; Norimatsu, T.; Nakata, Yoshiki; Tokita, Shigeki; Miyanaga, Noriaki; Kawanaka, Junji; Shiraga, H.; Mima, K.; Nishimura, Hiroaki; Bailly-Grandvaux, M.; Santos, J. J.; Nagatomo, Hideo; Azechi, H.; Kodama, R.; Arikawa, Yasunobu; Sentoku, Y.; Fujioka, Shinsuke

doi:10.1038/s41467-018-06173-6

Cited by 95 publications

(48 citation statements)

References 46 publications

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“…For ICF, ions should be heated up to the higher temperature exceeding keV in imploded dense plasmas. Our method might give an advanced technique for an alternative ignition scheme of ICF by a completely different use of magnetic fields from the previous ideas [34][35][36][37][38]. The keV ion plasma generated by this method could be an efficient thermal neutron source [39].…”

Section: Discussionmentioning

confidence: 99%

Ultrafast wave-particle energy transfer in the collapse of standing whistler waves

et al. 2019

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Efficient energy transfer from electromagnetic waves to ions has been demanded to control laboratory plasmas for various applications and could be useful to understand the nature of space and astrophysical plasmas. However, there exists a severe unsolved problem that most of the wave energy is converted quickly to electrons, but not to ions. Here, an energy conversion process to ions in overdense plasmas associated with whistler waves is investigated by numerical simulations and theoretical model. Whistler waves propagating along a magnetic field in space and laboratories often form the standing waves by the collision of counter-propagating waves or through the reflection. We find that ions in the standing whistler waves acquire a large amount of energy directly from the waves in a short timescale comparable to the wave oscillation period. Thermalized ion temperature increases in proportion to the square of the wave amplitude and becomes much higher than the electron temperature in a wide range of wave-plasma conditions. This efficient ion-heating mechanism applies to various plasma phenomena in space physics and fusion energy sciences.

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Section: Discussionmentioning

confidence: 99%

Ultrafast wave-particle energy transfer in the collapse of standing whistler waves

et al. 2019

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“…The achievement of the UHED with the fast isochoric heating can not be explained only with the enhanced drag heating that we had report in Ref. [14]. Twodimensional particle-in-cell (2D-PIC) simulation reveals that the diffusive heating mechanism contributed significantly to the keV heating of an imploded plasma in a time scale of a few picoseconds [4].…”

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confidence: 76%

“…The REs' large divergence is a critical issue in the drag heating. We had reported enhancement of the laser-to-matter energy coupling with the magnetized fast isochoric heating scheme [14]. The maximum coupling efficiency via the drag heating reached 7.7 ± 1.2% because of reduction of RE's divergence by the application of the external magnetic field.…”

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confidence: 97%

“…The experiment had been conducted on GEKKO-LFEX laser facility at Institute of Laser Engineering, Osaka University. The laser conditions, laser-to-core coupling efficiency by the drag heating, the geometrical positions of the target, and the diagnostics were identical to those of our previous experiment [14]. The experimental time origin (t exp = 0 ns) is defined hereafter as the peak of the compression laser pulse.…”

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Petapascal Pressure Driven by Fast Isochoric Heating with a Multipicosecond Intense Laser Pulse

Matsuo¹,

Higashi²,

Iwata³

et al. 2020

Phys. Rev. Lett.

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Fast isochoric laser heating is a scheme to heat a matter with relativistic-intensity (> 10 18 W/cm 2 ) laser pulse or X-ray free electron laser pulse. The fast isochoric laser heating has been studied for creating efficiently ultra-high-energy-density (UHED) state. We demonstrate an fast isochoric heating of an imploded dense plasma using a multi-picosecond kJ-class petawatt laser with an assistance of externally applied kilo-tesla magnetic fields for guiding fast electrons to the dense plasma.The UHED state with 2.2 Peta-Pascal is achieved experimentally with 4.6 kJ of total laser energy that is one order of magnitude lower than the energy used in the conventional implosion scheme. A two-dimensional particle-in-cell simulation reveals that diffusive heating from a laserplasma interaction zone to the dense plasma plays an essential role to the efficient creation of the UHED state.Power laser apparatus can inject a plenty of energy to a matter in a small volume within a short time duration. The matter becomes a high-energy-density state that is applicable to various scientific researches such as laboratory astrophysics [1] and several kind of radiation sources: X-rays, charged particles, and neutrons [2,3]. Fast isochoric heating of solid target to create such highenergy-density states have been demonstrated by short pulse laser [4] and X-ray free electron laser [5,6]. The fast isochoric laser heating of imploded plasma is one of the scheme to create ultra-high-energy-density (UHED) state, which is equivalent to the state at the center of the sun, for the inertial confinement fusion (ICF) science.In conventional implosion, kinetic energy of the imploded shell is converted to the internal energy of the compressed matter at the maximum compression. A UHED state with 36 Peta-Pascal (PPa) was achieved on the National Ignition Facility with 1.8 MJ of laser energy by the indirect X-ray driven implosion [7]. The OMEGA laser facility with 30 kJ of laser energy produced 5.6 PPa of UHED by the direct laser-driven implosion [8]. The current central ignition scheme requires enormous laser energy to create UHED state. The significant growth of hydrodynamic instabilities during the compression causes the hot spark mixing with the cold dense fuel and prevents efficient creation of UHED state.In the context of ICF, the fast isochoric heating also known as the fast ignition had been proposed as an alternative approach [9]. This approach separates compres-sion and heating processes to avoid the mixing, using a more stable compression followed by an external energy injection whose time scale is much shorter than the implosion time scale. Hence, it potentially leads to higher gain by increasing the mass of the compressed fuel .A cone-in-shell target is commonly used in the integrated fast-isochoric-heating experiments, since a dense plasma core, which is produced by the laser-driven implosion, is surrounded by a long-scale-length coronal plasma. The cone preserves a vacuum channel in the coronal plasma for the heating laser pulse to...

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“…Several methods to guide the REB along its propagation have been proposed. Most of those rely on the collimating effect of MeV electrons via either self-generated [20,[36][37][38][39] or imposed magnetic fields on the kilo-Tesla (kT) range [40,41]. For instance, studies have pointed out that materials with an atomic number greater than Al, that have high heat capacity and ionization level, can yield stable resistive collimation fields over the REB time scale and therefore enhance its collimation [42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Transport of kJ-laser-driven relativistic electron beams in cold and shock-heated vitreous carbon and diamond

et al. 2020

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We report experimental results on relativistic electron beam (REB) transport in a set of cold and shock-heated carbon samples using the high-intensity kilojoule-class OMEGA EP laser. The REB energy distribution and transport were diagnosed using an electron spectrometer and x-ray fluorescence measurements from a Cu tracer buried at the rear side of the samples. The measured rear REB density shows brighter and narrower signals when the targets were shock-heated. Hybrid PIC simulations using advanced resistivity models in the target warm-dense-matter (WDM) conditions confirm this observation. We show that the resistivity response of the media, which governs the selfgenerated resistive fields, is of paramount importance to understand and correctly predict the REB transport.

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Magnetized fast isochoric laser heating for efficient creation of ultra-high-energy-density states

Cited by 95 publications

References 46 publications

Ultrafast wave-particle energy transfer in the collapse of standing whistler waves

Ultrafast wave-particle energy transfer in the collapse of standing whistler waves

Petapascal Pressure Driven by Fast Isochoric Heating with a Multipicosecond Intense Laser Pulse

Transport of kJ-laser-driven relativistic electron beams in cold and shock-heated vitreous carbon and diamond

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