3D Simulations Capture the Persistent Low-Mode Asymmetries Evident in Laser-Direct-Drive Implosions on OMEGA

Colaïtis, A.; Turnbull, D.; Igumenschev, I. V.; Edgell, D. H.; Shah, Rahul; Mannion, O. M.; Stoeckl, C.; Jacob-Perkins, D W; Shvydky, A.; Janezic, R.; Kalb, A.; Cao, D.; Forrest, C.; Kwiatkowski, J.; Regan, S. P.; Theobald, W.; Goncharov, V. N.; Froula, D. H.

doi:10.1103/physrevlett.129.095001

Cited by 9 publications

(3 citation statements)

References 36 publications

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“…One major physics question is that of LPIs, particularly during the high-intensity laser spike pulse, which may reduce the amount of laser energy absorbed in the target [ 73 ] , reduce the amplitude of the shock wave [ 53 ] and prematurely heat the fuel by hot electrons [ 74 ] . Low-entropy implosions of standard direct-drive capsules have shown a high risk of failure, indicating new sufficiently resistant and robust target designs are needed.…”

Section: Inertial Confinement Fusion Research In Europementioning

confidence: 99%

Future for inertial-fusion energy in Europe: a roadmap

Batani,

Colaïtis,

Consoli

et al. 2023

High Pow Laser Sci Eng

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The recent achievement of fusion ignition with laser-driven technologies at the National Ignition Facility sets a historic accomplishment in fusion energy research. This accomplishment paves the way for using laser inertial fusion as a viable approach for future energy production. Europe has a unique opportunity to empower research in this field internationally, and the scientific community is eager to engage in this journey. We propose establishing a European programme on inertial-fusion energy with the mission to demonstrate laser-driven ignition in the direct-drive scheme and to develop pathway technologies for the commercial fusion reactor. The proposed roadmap is based on four complementary axes: (i) the physics of laser–plasma interaction and burning plasmas; (ii) high-energy high repetition rate laser technology; (iii) fusion reactor technology and materials; and (iv) reinforcement of the laser fusion community by international education and training programmes. We foresee collaboration with universities, research centres and industry and establishing joint activities with the private sector involved in laser fusion. This project aims to stimulate a broad range of high-profile industrial developments in laser, plasma and radiation technologies along with the expected high-level socio-economic impact.

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Section: Inertial Confinement Fusion Research In Europementioning

confidence: 99%

Future for inertial-fusion energy in Europe: a roadmap

Batani,

Colaïtis,

Consoli

et al. 2023

High Pow Laser Sci Eng

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“…In the second part (see [16]), we present a detailed application of the inline polarized CBET model to OMEGA implosions, and assess the contribution from various low mode sources to the overall implosion budget as well as mitigation strategies. The summarized results from these two papers is also given in [17].…”

Section: Introductionmentioning

confidence: 99%

3D simulations of inertial confinement fusion implosions part 1: inline modeling of polarized cross beam energy transfer and subsequent drive anomalies on OMEGA and NIF

Colaïtis¹,

Edgell²,

Igumenshchev³

et al. 2022

Plasma Phys. Control. Fusion

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Inertial conﬁnement fusion experiments are sensitive to Cross-Beam Energy Transfer (CBET), a nonlinear laser-plasma instability that redistributes laser energy in the coronal plasma through self-generated Ion Acoustic Wave (IAW) gratings. The detailed CBET coupling depends on the polarization state of the crossing waveﬁelds. CBET itself can also scramble the beam polarizations by inducing ellipticity through the IAW grating, and rotating the seed polarization toward that of the pump. We develop a ray-based model that describes the polarized CBET coupling and that is compatible with the framework of 3D inline radiative hydrodynamics simulations. The model is implemented in the ASTER/IFRIIT code and validated against an academic test case and an oﬄine polarized CBET post-processor. It is then applied to the detailed conﬁguration of the Distributed Polarization Rotator system on OMEGA, where results highlight how polarized CBET induces signiﬁcant low modes in the collisional absorption source term. Finally, the modeling is applied to a simple indirect-drive conﬁguration, comparing CBET calculations with 96 unpolarized or polarized beams with 24 unpolarized quads. It is shown that these cases produce similar power ampliﬁcation per cone of beams grouped with similar polar angles. However, the 96 beam geometry itself is found to reduce azimuthal variations in quad power after the interaction and favors beams with larger polar angles within the cones, an eﬀect that is ampliﬁed by the polarized CBET. Application of the model to inline calculations of OMEGA implosions are presented in a companion paper.

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“…The aim of this paper is to assess the contributions from various sources of low modes to DT flow velocity and direction in order to (a) quantify the sensitivity of current target designs to the best setup performances of the OMEGA laser system, and (b) assess whether the source of the systematic flow can be identified. For that purpose, we make use of state-of-the-art 3D radiation hydrodynamics simulations, and notably, the first inline polarized cross-beam energy transfer (CBET) model detailed in the companion paper [5] and summarized in [6].…”

Section: Introductionmentioning

confidence: 99%

3D simulations of inertial confinement fusion implosions part 2: systematic flow anomalies and impact of low modes on performances in OMEGA experiments

Colaïtis¹,

Igumenshchev²,

Turnbull³

et al. 2022

Plasma Phys. Control. Fusion

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We present the ﬁrst 3-D radiation-hydrodynamic simulations of directly driven inertial conﬁnement fusion implosions with an inline package for polarized crossed-beam energy transfer, which were used to assess the impact of the current Distributed Polarization Rotators (DPRs) on OMEGA as well as other known sources of asymmetry. Applied to OMEGA implosions, the simulations predict bang times with no need for ad hoc multipliers, as well as yields—if you separately account for the impacts of imprint and fuel age. Magnitude of the ﬂow is well reproduced when the low mode sources are large, whereas the modeling of stalk is thought to be required to match the ﬂow magnitude in the remaining cases. For the cases explored in more details, polarized CBET—the only known systematic drive asymmetry, brought the results closest to the measured ﬂow vectors. The remaining discrepencies are shown to be stemming from the limited knowledge of the laser pointing modes. For typical current levels of beam mispointing, power imbalance, target oﬀset, and asymmetry caused by polarized CBET, low modes degrade the yield by more than 40%. The current strategy of attempting to compensate the mode-1 asymmetry with a preimposed target oﬀset recovers only about 1/3 of the losses caused by the low modes due to the dynamic nature of the multiple asymmetries and the presence of low modes other than l = 1. Therefore, addressing the root causes of the drive asymmetries is apt to be more beneﬁcial. To that end, one possible solution to the speciﬁc issue of polarized CBET (10µm DPRs) is shown to work well.

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3D Simulations Capture the Persistent Low-Mode Asymmetries Evident in Laser-Direct-Drive Implosions on OMEGA

Cited by 9 publications

References 36 publications

Future for inertial-fusion energy in Europe: a roadmap

Future for inertial-fusion energy in Europe: a roadmap

3D simulations of inertial confinement fusion implosions part 1: inline modeling of polarized cross beam energy transfer and subsequent drive anomalies on OMEGA and NIF

3D simulations of inertial confinement fusion implosions part 2: systematic flow anomalies and impact of low modes on performances in OMEGA experiments

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