Thick Liquid-Walled, Field-Reversed Configuration-Magnetic Fusion Power Plant

Moir, R.W.; Bulmer, R.H.; Gulec, K.; Fogarty, P.J.; Nelson, B.; Ohnishi, Masami; Rensink, M.E.; Rognlien, T. D.; Santarius, J. F.; Sze, D.K.

doi:10.13182/fst01-a11963330

Cited by 8 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on prior work on the Field Reversed Configuration (FRC) [8], we can scale to get a first approximation of some of the parameters. First we scale the power density.…”

Section: Plasma Parametersmentioning

confidence: 99%

Thick Liquid-Walled Spheromak Magnetic Fusion Power Plant

Moir¹,

Bulmer²,

Fowler³

et al. 2003

View full text Add to dashboard Cite

We assume a spheromak configuration can be made and sustained by a steady plasma gun current, which injects particles, current and magnetic field, i.e., helicity injection. The magnetic configuration is evaluated with an axisymmetric free-boundary equilibrium code, where the current profile is tailored to support an average beta of 10%. An injection current of 100 kA (125 MW of gun power) sustains the toroidal current of 40 MA. The flux linking the gun is 1/1000 th of the flux in the spheromak. The geometry allows a flow of liquid, either molten salt (flibe-Li 2 BeF 4 or flinabe-LiNaBeF 4) or liquid metal, such as SnLi, which protects most of the walls and structures from neutron damage. The free surface between the liquid and the burning plasma is heated by bremsstrahlung and optical radiation and neutrons from the plasma. The temperature of the free surface of the liquid is calculated and then the evaporation rate is estimated. The impurity concentration in the burning plasma is estimated and limited to a 20% reduction in the fusion power (≈0.8% fluorine impurity). The divertor power density of 620 MW/m 2 is handled by high-speed (100 m/s) liquid jets. Calculations show that the tritium breeding is adequate with enriched 6 Li and appropriate design of the walls not covered by flowing liquid (15% of the total). A number of problem areas need further study to make the design self consistent and workable, including lowering the divertor power density by expanding the flux tube size.

show abstract

“…Based on prior work on the Field Reversed Configuration (FRC) [8], we can scale to get a first approximation of some of the parameters. First we scale the power density.…”

Section: Plasma Parametersmentioning

confidence: 99%

Thick Liquid-Walled Spheromak Magnetic Fusion Power Plant

Moir¹,

Bulmer²,

Fowler³

et al. 2003

View full text Add to dashboard Cite

show abstract

“…The field of 5.24 T on R=0 axis, which corresponds to a 40 MA toroidal current. Based on prior work on the Field Reversed Configuration (FRC) [10], we can scale to get a first approximation of some of the parameters.…”

Section: Plasma Parametersmentioning

confidence: 99%

“…Here C=3.828x10 23 for BeF 2 evaporation and 9.961x10 23 for Li evaporation with values for A and B given in [10] except that Li values were erroneous there and should be A=23.29 and B=18750. From Table 4, we get 0.05 MW/m 2 of line radiation, surface heat load and 0.17 MW/m 2 of bremsstrahlung radiation.…”

Section: Power Plant Considerationsmentioning

confidence: 99%

Spheromak Magnetic Fusion Energy Power Plant with Thick Liquid-Walls

Moir

Bulmer

Fowler

et al. 2003

Fusion Science and Technology

Self Cite

View full text Add to dashboard Cite

A power plant based on a spheromak device using liquid walls is analyzed. We assume a spheromak configuration can be made and sustained by a steady plasma gun current, which injects particles, current and magnetic field, i.e., helicity injection, which are transported into the core region. The magnetic configuration is evaluated with an axisymmetric freeboundary equilibrium code, where the current profile is tailored to support an average beta of 10%. An injection current of 100 kA (125 MW of gun power) sustains the toroidal current of 40 MA. The magnetic flux linking the gun is 1/1000 th of the flux in the spheromak. The geometry allows a flow of liquid, either molten salt, (flibe-Li 2 BeF 4 or flinabe-LiNaBeF 4), or liquid metal such as SnLi, which protects most of the walls and structures from damage arising from neutrons and plasma particles. The free surface between the liquid and the burning plasma is heated primarily by bremsstrahlung, line radiation, and some by neutrons. The temperature of the free surface of the liquid is calculated and then the evaporation rate is estimated from vaporpressure data. The impurity concentration in the burning plasma, about 0.8% fluorine, is limited to that giving a 20% reduction in the fusion power. The divertor power density of 620 MW/m 2 is handled by high-speed (100 m/s) liquid jets. Calculations show the tritium breeding is adequate with enriched 6 Li, and a design is given for the walls not covered by flowing liquid (~15% of the total). We identified a number of problem areas needing further study to make the design more self-consistent and workable, including lowering the divertor power density by expanding the flux tube size.

show abstract

Impurity transport in edge plasmas with application to liquid walls

Rognlien

Rensink

2002

Physics of Plasmas

View full text Add to dashboard Cite

The transport of impurity ions in a magnetically confined plasma is studied in the region between their origin at a material surface and the core plasma as defined by closed magnetic flux surfaces. The focus is physics understanding of the results of two-dimensional (2-D) transport modeling of the plasma and neutrals. A simple one-dimensional model is introduced to identify key processes and illustrate how such processes affect the core-edge impurity level. The 2-D simulation gives detailed results of scaling of the impurity level with parameters such as anomalous radial diffusion, hydrogen–plasma recycling, core power flux, and core-edge density. The results are obtained for a slab model of a tokamak, but by changing the magnetic connection length, scaling to other types of devices can be inferred. Lithium and fluorine impurities are considered explicitly as examples with low and moderate charge-state number, Z, for liquid wall materials; trends found for these cases provide guidance to the behavior of other impurities. The tolerable amount of impurity influx can be closely associated with the partial thermal collapse of the edge plasma. The results are used to provide a physics picture of previous results on the acceptable evaporative impurity flux from different types of liquid wall materials, and to show how these results can be expected to scale with parameters.

show abstract

Thick Liquid-Walled, Field-Reversed Configuration-Magnetic Fusion Power Plant

Cited by 8 publications

References 8 publications

Thick Liquid-Walled Spheromak Magnetic Fusion Power Plant

Thick Liquid-Walled Spheromak Magnetic Fusion Power Plant

Spheromak Magnetic Fusion Energy Power Plant with Thick Liquid-Walls

Impurity transport in edge plasmas with application to liquid walls

Contact Info

Product

Resources

About