Experiments with Controllable Application of Radial Electric Fields in GDT Central Cell

Bagryansky, P. A.; Lizunov, A. A.; Zuev, Alexander; Kolesnikov, E. Yu.; Solomachin, A. L.

doi:10.13182/fst03-a11963583

Cited by 20 publications

(9 citation statements)

References 5 publications

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“…3(a) (often refer to as a limiter ) can set the local electric potential. It has also been shown to effectively affect the local electric field and rotation in mirror machines 76 , linear experiments 77 and toroidal devices 78 . However, the electric field in the plasma is set through the plasma self-reorganization stemming from the imposed boundary condition.…”

Section: A Foundations For Driving Crossed-field Flows Via Electrode ...mentioning

confidence: 99%

ExB flows for high-throughput plasma mass separation

Gueroult¹,

Zweben²,

Fisch³

et al. 2018

Preprint

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High-throughput plasma separation based on atomic mass holds the promise for offering unique solutions to a variety of high-impact societal applications. Through the mass differential effects they exhibit, crossed-field configurations can in principle be exploited in various ways to separate ions based on atomic mass. Yet, the practicality of these concepts is conditioned upon the ability to drive suitable crossed-field flows for plasma parameters compatible with high-throughput operation. Limited current predictive capabilities have not yet made it possible to confirm this possibility. Yet, past experimental results suggest that end-electrodes biasing may be effective, at least for certain electric field values. A better understanding of cross-field conductivity is needed to confirm these results and confirm the potential of crossed-field configurations for high-throughput separation.

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Section: A Foundations For Driving Crossed-field Flows Via Electrode ...mentioning

confidence: 99%

ExB flows for high-throughput plasma mass separation

Gueroult¹,

Zweben²,

Fisch³

et al. 2018

Preprint

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“…In magnetic confinement fusion experiments, the high plasma temperature and density generally prohibit inserting electrodes in the plasma core, and biasing experiments thus typically involve edge biasing [17]. While this technique has been shown to be effective at affecting edge properties under certain conditions [18,19], the use of a single polarized surface at the edge -a biasing configuration known as a limiter -does not provide control over how the applied bias distributes itself across magnetic surfaces. The perpendicular electric field indeed remains an intricate function of the plasma properties [17].…”

Section: Introductionmentioning

confidence: 99%

“…(17) modeling the ion-sheath in front of the electrode. The purple BC is the Dirichlet condition given in Eq (18)…”

mentioning

confidence: 99%

Trade-off in perpendicular electric field control using negatively biased emissive end-electrodes

Trotabas,

Gueroult

2021

Preprint

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The benefits of thermionic emission from negatively biased electrodes for perpendicular electric field control in a magnetized plasma are examined through its combined effects on the sheath and on the plasma potential variation along magnetic field lines. By increasing the radial current flowing through the plasma thermionic emission is confirmed to improve control over the plasma potential at the sheath edge compared to the case of a cold electrode. Conversely, thermionic emission is shown to be responsible for an increase of the plasma potential drop along magnetic field lines in the quasi-neutral plasma. These results suggest that there exists a trade-off between electric field longitudinal uniformity and amplitude when using negatively biased emissive electrodes to control the perpendicular electric field in a magnetized plasma.

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“…A significant role in making this device MHD stable is played by the out flowing plasma, which, on the one hand, provides a favorable contribution to the stability integral [2] and, on the other hand, provides an electric contact with the conducting end wall. Applying a potential to the segmented limiter transfers to the confinement zone along the field lines a radial potential that may further improve stability [3,4]. This technique can be used in a fusion neutron source for materials and subcomponent testing with no (or with a minor) extrapolation of the plasma parameters from the existing experiment [1], which will operate at plasma Q of order of a few percent [5].…”

Section: Introductionmentioning

confidence: 99%

Mirror-based hybrids of recent design

Moir

Martovetsky

Molvik

et al. 2012

AIP Conference Proceedings

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Early application of the simple axisymmetric mirror, requiring intermediate performance between a neutron source for materials testing Q=P fusion /P input ~0.05 and pure fusion Q>10, are the hybrid applications. The Axisymmetric Mirror has attractive features as a driver for a fusion-fission hybrid system: geometrical simplicity, as well as the typical mirror features of inherently steady-state operation, and natural divertors in the form of end tanks. Operation at Q~0.7 allows for relatively low electron temperatures, in the range of 3 keV, for the DT injection energy ~ 80 keV from existing positive ion neutral beams designed for steady state. This level of physics performance has the virtue of being low risk with only modest R&D needed; and its simplicity promises economy advantages. A simple mirror with the plasma diameter of 1 m and mirror-to-mirror 2.5 T solenoid length of 40 m is discussed. Simple circular steady state superconducting coils at each end are based on 15 T technology development of the ITER central solenoid. Hybrids obtain important revenues from the sale of both electricity and fuel production or waste burning. Burning fission reactor wastes by fissioning transuranics in the hybrid will multiply fusion's neutron energy by a factor of ~10 or more and diminish the Q needed to overcome the cost of recirculating power for good economics to less than 2 and for minor actinides with multiplication over 50 to Q~0.2. Hybrids that produce fissile fuel with fissioning blankets might need Q<2 while suppressing fissioning might be the most economical application of fusion but will require Q>4.

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Experiments with Controllable Application of Radial Electric Fields in GDT Central Cell

Cited by 20 publications

References 5 publications

ExB flows for high-throughput plasma mass separation

ExB flows for high-throughput plasma mass separation

Trade-off in perpendicular electric field control using negatively biased emissive end-electrodes

Mirror-based hybrids of recent design

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