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Title: Spheromak Magnetic Fusion Energy Power Plant with Thick Liquid-Walls

Abstract

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{sup th} of the flux in the spheromak. The geometry allows a flow of liquid, either molten salt, (flibe-Li{sub 2}BeF{sub 4} or flinabe-LiNaBeF{sub 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 vapor-pressure data. The impurity concentration in the burning plasma, about 0.8% fluorine, is limited to that giving a 20%more » reduction in the fusion power. The divertor power density of 620 MW/m{sup 2} is handled by high-speed (100 m/s) liquid jets. Calculations show the tritium breeding is adequate with enriched {sup 6}Li, and a design is given for the walls not covered by flowing liquid ({approx}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.« less

Authors:
 [1];  [1];  [2];  [1];  [3]
  1. Lawrence Livermore National Laboratory (United States)
  2. University of California at Berkeley (United States)
  3. University of California at Los Angeles (United States)
Publication Date:
OSTI Identifier:
20849533
Resource Type:
Journal Article
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 44; Journal Issue: 2; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1536-1055
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AXIAL SYMMETRY; BREEDING BLANKETS; BREMSSTRAHLUNG; DESIGN; DIVERTORS; ELECTRIC CURRENTS; FLIBE; FLUORINE; HELICITY; LIQUID METALS; LITHIUM 6; MAGNETIC FIELDS; MAGNETIC FLUX; NEUTRONS; PLASMA; PLASMA GUNS; POWER DENSITY; SPHEROMAK DEVICES; THERMONUCLEAR REACTOR WALLS; THERMONUCLEAR REACTORS; TRITIUM; VAPOR PRESSURE

Citation Formats

Moir, R W, Bulmer, R H, Fowler, T K, Rognlien, T D, and Youssef, M Z. Spheromak Magnetic Fusion Energy Power Plant with Thick Liquid-Walls. United States: N. p., 2003. Web.
Moir, R W, Bulmer, R H, Fowler, T K, Rognlien, T D, & Youssef, M Z. Spheromak Magnetic Fusion Energy Power Plant with Thick Liquid-Walls. United States.
Moir, R W, Bulmer, R H, Fowler, T K, Rognlien, T D, and Youssef, M Z. Mon . "Spheromak Magnetic Fusion Energy Power Plant with Thick Liquid-Walls". United States.
@article{osti_20849533,
title = {Spheromak Magnetic Fusion Energy Power Plant with Thick Liquid-Walls},
author = {Moir, R W and Bulmer, R H and Fowler, T K and Rognlien, T D and Youssef, M Z},
abstractNote = {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{sup th} of the flux in the spheromak. The geometry allows a flow of liquid, either molten salt, (flibe-Li{sub 2}BeF{sub 4} or flinabe-LiNaBeF{sub 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 vapor-pressure 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{sup 2} is handled by high-speed (100 m/s) liquid jets. Calculations show the tritium breeding is adequate with enriched {sup 6}Li, and a design is given for the walls not covered by flowing liquid ({approx}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.},
doi = {},
url = {https://www.osti.gov/biblio/20849533}, journal = {Fusion Science and Technology},
issn = {1536-1055},
number = 2,
volume = 44,
place = {United States},
year = {2003},
month = {9}
}