The physics of burn in magnetized deuterium-tritium plasmas: spherical geometry

Jones, R.D.; Mead, W. C.

doi:10.1088/0029-5515/26/2/001

Cited by 49 publications

(26 citation statements)

References 4 publications

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“…The primary attraction to any MIF fusion scheme is that the power required to drive these slow velocity implosions is significantly smaller than required for standard ICF and could potentially offer a low cost approach to fusion 16 . Jones and Mead 17 performed detailed numerical simulations of spherical capsules, which supported the conclusion that a magnetic field could improve volume burn of a deuterium-tritium (DT) gas. However, they also showed that a magnetic field tended to inhibit the propagation of a burn wave into a surrounding layer of cold dense DT.…”

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confidence: 77%

High-Gain Magnetized Inertial Fusion

2012

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Magnetized inertial fusion (MIF) could substantially ease the difficulty of reaching plasma conditions required for significant fusion yields, but it has been widely accepted that the gain is not sufficient for fusion energy. Numerical simulations are presented showing that high-gain MIF is possible in cylindrical liner implosions based on the MagLIF concept [S. A. Slutz et al Phys. Plasmas 17, 056303 (2010)] with the addition of a cryogenic layer of deuterium-tritium (DT). These simulations show that a burn wave propagates radially from the magnetized hot spot into the surrounding much denser cold DT given sufficient hot-spot areal density. For a drive current of 60 MA the simulated gain exceeds 100, which is more than adequate for fusion energy applications. The simulated gain exceeds 1000 for a drive current of 70 MA.

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confidence: 77%

High-Gain Magnetized Inertial Fusion

2012

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“…The fields, if large enough, could reduce the R-T growth rate (Section 2.3). The magnetic fields, amplified in the fuel by plasma compression, could greatly increase the yield (Jones & Mead 1986). The challenge is to understand and to represent the complex magnetic contributions (Sections 2 and 3) with sufficient accuracy to predict actual pellet performance.…”

Section: Relevance To Inertial Confinement Fusionmentioning

confidence: 99%

Review on spontaneous magnetic fields in laser-produced plasmas: Phenomena and measurements

Stamper

1991

Laser Part. Beams

181

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Large (megagauss) "spontaneous" magnetic fields are produced by laser-plasma interactions when a short, powerful laser pulse is focused to a small diameter onto a solid target. The relevance of these magnetic fields to inertial confinement fusion applications depends on the numerous ways in which they can affect laser-plasma interactions and the resulting plasma. Theoretical studies have dealt with a variety (thermal, radiative, and dynamo) of generation mechanisms and with the associated transport and instability phenomena. The fields, originally observed with small induction probes placed near the target, have been studied in the focal region by optical methods. These optical diagnostics have used Faraday rotation of a probing laser beam and Zeeman profiles of emitted spectral lines.

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“…Using a magnetic field to enhance inertial fusion is an old idea (Jones & Mead 1986) receiving renewed interest (Slutz & Vesey 2012). An imposed field is being investigated at LLNL as a way to improve capsule performance and achieve ignition on the National Ignition Facility (NIF) (Perkins et al 2013(Perkins et al , 2014D.…”

Section: Introductionmentioning

confidence: 99%

Imposed magnetic field and hot electron propagation in inertial fusion hohlraums

et al. 2015

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The effects of an imposed, axial magnetic field B z0 on hydrodynamics and energetic electrons in inertial confinement fusion (ICF) indirect-drive hohlraums are studied. We present simulations from the radiation-hydrodynamics code HYDRA of a low-adiabat ignition design for the National Ignition Facility (NIF), with and without B z0 = 70 Tesla. The field's main hydrodynamic effect is to significantly reduce electron thermal conduction perpendicular to the field. This results in hotter and less dense plasma on the equator between the capsule and hohlraum wall. The inner laser beams experience less inverse bremsstrahlung absorption before reaching the wall. The x-ray drive is thus stronger from the equator with the imposed field. We study superthermal, or "hot," electron dynamics with the particle-in-cell code ZUMA, using plasma conditions from HYDRA. During the early-time laser picket, hot electrons based on two-plasmon decay in the laser entrance hole (Regan et al. 2010) are guided to the capsule by a 70 T field. 12x more energy deposits in the deuterium-tritium (DT) fuel. For plasma conditions early in peak laser power, we present mono-energetic test-case studies with ZUMA as well as sources based on inner-beam stimulated Raman scattering. The effect of the field on DT deposition depends strongly on the source location, namely whether hot electrons are generated on field lines that connect to the capsule.

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The physics of burn in magnetized deuterium-tritium plasmas: spherical geometry

Cited by 49 publications

References 4 publications

High-Gain Magnetized Inertial Fusion

High-Gain Magnetized Inertial Fusion

Review on spontaneous magnetic fields in laser-produced plasmas: Phenomena and measurements

Imposed magnetic field and hot electron propagation in inertial fusion hohlraums

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