Monte Carlo particle collision model for qualitative analysis of neutron energy spectra from anisotropic inertial confinement fusion

Abe, Yuki; Johzaki, Tomoyuki; Sunahara, A.; Arikawa, Yasunobu; Ozaki, T.; Ishii, Katsuhiro; Hanayama, Ryohei; Okihara, S.; Miura, Eisuke; Komeda, Osamu; Sakata, Shohei; Matsuo, Kazuki; Morita, Hiroki; Takizawa, Ryunosuke; Mizutani, Ryosuke; Iwamoto, A.; Sakagami, Hiroyuki; Sentoku, Y.; Shiraga, H.; Nakai, M.; Fujioka, Shinsuke; Mori, Y.; Kitagawa, Yoneyoshi

doi:10.1016/j.hedp.2020.100803

Cited by 9 publications

(4 citation statements)

References 19 publications

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“…Without hitting the LFEX, the neutron scintillator array 'MANDALA' measured the 2.45 MeV yield Yn to be (3.47 ± 0.18) × 10 6 /4π sr, as shown later in figure 8(a) [15,16]. A clear thermal neutron peak at 2.45 MeV appears to show that the imploded core was almost thermalized.…”

Section: T 0 Of the Imploded Core Plasma For The Axial Modementioning

confidence: 93%

Direct fast heating efficiency of a counter-imploded core plasma employing a laser for fast ignition experiments (LFEX)

et al. 2022

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This study investigates the efficiency of the fast heating when a preimploded core is directly heated with an ultraintense laser(a heating laser). The efficiency is defined as an increment of internal core energy divided by heating laser energy on target. Six counterbeams from the GEKKO XII (GXII) green laser at the Institute of Laser Engineering (ILE), Osaka University, of which the output was 1.6kJ, imploded a spherical CD (Deuterated polystyrene) shell target and formed a dense core. DD-reacted protons and the x-ray core emissions showed a core density of 2.8 ∼ 2.7g/cm3. DD-reacted thermal neutrons were used to estimate the core temperature determined as 650 ∼ 750 eV. The core was then directly heated by a laser for fast-ignition experiments (LFEX), an extremely energetic ultrashort pulse laser at the ILE either with its axis lying to the GXII bundle axis, or with its axis perpendicular to the GXII bundle axis. We call the former laser configuration “Axial mode”, and the latter “Transverse mode”. η is 2% or less for Axial mode and 6% or less for Transverse mode. The efficiencies were compared to that of a uniform implosion mode, which was 3%.

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Section: T 0 Of the Imploded Core Plasma For The Axial Modementioning

confidence: 93%

Direct fast heating efficiency of a counter-imploded core plasma employing a laser for fast ignition experiments (LFEX)

et al. 2022

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“…σ DD at T ion can be obtained to be 0.1 b (−200 ps) and 0.076 b (+300 ps). On the other hand, Ny are 2.47 × 10 8 (−200 ps) and 0.268 × 10 8 (+300 ps) from the Mandala [25]. N Dbeam can be calculated from equation (3).…”

Section: Ionsmentioning

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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“…f,1 /2 of suprathermal tail spectrum, according to (20)- (22). In order to more intuitively study the relationship between E 0 , σ 0 of the product spectrum with E f , T of the suprathermal tail spectrum, we have defined the spectral moments as the combination of the spectral peak shift of product spectrum and effective temperature of suprathermal tail spectrum (∆E, T), where ∆E = E 0 − m 3 Q/η [31].…”

Section: The Energy Spectrum Of Nuclear Reaction Product From Nonther...mentioning

confidence: 99%

“…Over the past decades, the nuclear diagnostic scheme has been proposed [18,19] to diagnose the state of HED plasma, which is applied to diagnose the temperature of fusion fuel in inertial confinement fusion (ICF) [20][21][22] and the beamtarget reaction in Z-pinch [23] experiments, the magnetization degree of ions in magneto-ICF [24,25] experiments and ion beam parameters in laser-driven ion acceleration experiments. Based on this, several researchers have explored the numerical solution of the product spectrum in different plasma states [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

A nuclear-reaction-based method for probing the nonthermal ion energy spectrum in high energy density laboratory plasmas

Li,

Liu,

Liu

et al. 2023

Nucl. Fusion

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The nuclear reactions in a plasma system with particle distributions deviated from the Maxwellian are proved to have some unique characteristics, in particular, in their reaction product energy spectra. Based on this, a new nuclear-reaction-based method for probing the nonthermal ion energy spectrum in high-energy-density (HED) laboratory plasmas is proposed, where the energy spectrum of the nonthermal ion high-energy tails can be accurately evaluated through analysis from the spread and peak of the product energy spectrum. The principle of this diagnostic method is theoretically derived and verified by two-dimensional particle-in-cell simulations that self-consistently includes the nuclear reaction calculations. As an example, our simulations demonstrate clearly how this method is applied for probing the nonthermal high-energy protons produced in the HED magnetic reconnection experiment, where a small ratio of boron element is dopped in the laser-ablated hydrocarbon target and the proton-boron (pB) reaction is chosen as the referenced nuclear reaction. The simulations also show that the pB reaction rate is increased by 4 orders of magnitude and the peak of the energy spectrum of the generated alpha particles shift significantly towards the high-energy range due to the nonthermal protons accelerated from reconnections.

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Monte Carlo particle collision model for qualitative analysis of neutron energy spectra from anisotropic inertial confinement fusion

Cited by 9 publications

References 19 publications

Direct fast heating efficiency of a counter-imploded core plasma employing a laser for fast ignition experiments (LFEX)

Direct fast heating efficiency of a counter-imploded core plasma employing a laser for fast ignition experiments (LFEX)

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

A nuclear-reaction-based method for probing the nonthermal ion energy spectrum in high energy density laboratory plasmas

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