Particle and heat transport in a dense wall-confined MTF plasma (theory and simulations)

Ryutov, D. D.; Barnes, D. C.; Bauer, Bruno; Hammer, J.H.; Hartman, C.W.; Kirkpatrick, Ronald C.; Lindemuth, I.R.; Makhin, V.; Parks, P.B.; Reisman, D. B.; Sheehey, P.T.; Siemon, R. E.

doi:10.1088/0029-5515/43/9/320

Cited by 15 publications

(9 citation statements)

References 33 publications

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“…Yet another effect where the parameter Col plays a significant role is the mesoscale plasma turbulence that may drive the anomalous transport (Bohm-like transport) (see [35], [36], [37]): this parameter affects the growth rates of the drift-type perturbations (see Section VII). Table I presents the plasma parameters for several regimes characteristic of the Z -pinches.…”

Section: General Characterization Of the Z -Pinch Plasmas A Collmentioning

confidence: 99%

“…As mentioned in Section VI-A, we characterize the role of cross-field transport by the ratio of the first and the second terms in the RHS of (37). The corresponding dimensionless parameter Cond is Cond = 10vτ cond 3r (48) where v is the implosion velocity.…”

Section: ]) Is Approximatelymentioning

confidence: 99%

“…This analysis has been performed in [36] and [37] and has led to a conclusion that in the regime of ε and 1/Col 1, the diffusion coefficient is smaller than the Bohm diffusion coefficient (47) by a factor of 3-5. According to discussion of Section VI-C, this would make anomalous cross-field transport in the MagLIF-MTF setting relatively unimportant.…”

Section: Anomalous Heat Transportmentioning

confidence: 99%

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Characterizing the Plasmas of Dense $Z$ -Pinches

Ryutov

2015

IEEE Trans. Plasma Sci.

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This mini-tutorial summarizes the plasma characteristics important for the Z-pinch research, with an emphasis on high-density collisional plasmas. It begins with the discussion of the most basic plasma properties related to collisionality and magnetization and then proceeds to more complex phenomena associated with magnetic field evolution in a highly dynamical plasma. Plasma transport properties are discussed mostly in conjunction with the Magnetized Liner Inertial Fusion concept. Issues of interplay of the classical and anomalous transport in a plasma whose pressure is higher than the magnetic pressure are elucidated. Differences in magnetic reconnection in weakly versus highly collisional plasmas are discussed. Kinetic effects and the role of microturbulence are mentioned in conjunction with the formation of high-energy tails in the particle distribution functions and the generation of particle beams. The discussion is based on the order-of-magnitude estimates suitable for initial orientation in the problem. The two appendixes contain some auxiliary material.

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Section: General Characterization Of the Z -Pinch Plasmas A Collmentioning

confidence: 99%

Section: ]) Is Approximatelymentioning

confidence: 99%

Section: Anomalous Heat Transportmentioning

confidence: 99%

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Characterizing the Plasmas of Dense $Z$ -Pinches

Ryutov

2015

IEEE Trans. Plasma Sci.

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“…I N MAGNETIZED target fusion, a metal liner compresses a magnetized deuterium-tritium plasma to high densities and temperatures, and the plasma is contained for a sufficiently long time that fusion with gain larger than one can be achieved [1]- [5]. The cost of such a system is much lower than for inertial confinement fusion or for magnetic confinement fusion using a tokamak because it can be developed with low-cost Manuscript pulsed-power drivers such as Atlas or Shiva-Star.…”

Section: Introductionmentioning

confidence: 99%

A Zebra Experiment to Study Plasma Formation by Megagauss Fields

Fuelling

Awe

Bauer

et al. 2008

IEEE Trans. Plasma Sci.

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An alternative concept for fusion energy production is magnetized target fusion using metal liners to compress a mixture of magnetic flux and plasma fuel. In liner flux compression experiments, megagauss fields are produced at peak compression that heats the surfaces of aluminum walls of the liner cavity. Some radiation magnetohydrodynamic (MHD) modeling indicates that plasma formation should occur between 3 and 5 MG; however, such modeling depends on assumed material properties, which are a topic of ongoing research. Load hardware and diagnostics have been developed to study metal vapor and plasma formation on aluminum surfaces subjected to pulsed megagauss fields on the University of Nevada Zebra facility. The experiment is designed to study this interesting threshold for plasma formation. A current of 1 MA is pulsed along a stationary central rod to generate magnetic fields of 2-4 MG. The goal is to observe and diagnose the formation of metal vapor and plasma in the vicinity of the rod. The simple geometry enables easy access by diagnostics, which include magnetic sensors, filtered photodiode measurements, optical imaging, and laser schlieren, shadowgraphy, and interferometry. From these measurements, the magnetic field, the temperature of the surface metal plasma, the radiation field, and the growth of instabilities can be inferred. The diagnostics are time resolved to individually examine the distinct phases of heating, surface plasma formation predicted by radiation MHD modeling, and instability.

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“…The consequence is that the anomalous heat transport will be determined by strongly collisional drift waves [9]. In a number of cases, the resulting heat loss will be substantially slower than that determined by the much-feared Bohm transport [9,10]. In addition, because of a much higher density (and therefore, much shorter confinement time needed to reach a certain Q value), the limitations on the acceptable level of the anomalous transport are much more forgiving than in the canonical low-density magnetic confinement systems.…”

Section: Introductionmentioning

confidence: 99%

Magnetized Target Fusion With Centimeter-Size Liners

Ryutov¹

2006

AIP Conference Proceedings

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The author concentrates on the version of magnetized target fusion (MTF) that involves 3D implosions of a wall-confined plasma with the density in the compressed state 1 0 21-10 22 cm-3. Possible plasma configurations suitable for this approach are identified. The main physics issues are outlined (equilibrium, stability, transport, plasma-liner interaction, etc). Specific parameters of the experiment reaching the plasma Q~1 are presented (Q is the ratio of the fusion yield to the energy delivered to the plasma). It is emphasized that there exists a synergy between the physics and technology of MTF and dense Z-pinches (DZP). Specific areas include the particle and heat transport in a high-beta plasma, plasma-liner interaction, liner stability, stand-off problem for the power source, reaching a rep-rate regime in the energyproducing reactor, etc. Possible use of existing pulsed-power facilities for addressing these issues is discussed.

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Particle and heat transport in a dense wall-confined MTF plasma (theory and simulations)

Abstract: This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author.

Cited by 15 publications

References 33 publications

Characterizing the Plasmas of Dense $Z$ -Pinches

Characterizing the Plasmas of Dense $Z$ -Pinches

A Zebra Experiment to Study Plasma Formation by Megagauss Fields

Magnetized Target Fusion With Centimeter-Size Liners

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