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Title: First wall for polarized fusion reactors

Abstract

A first-wall or first-wall coating for use in a fusion reactor having polarized fuel may be formed of a low-Z non-metallic material having slow spin relaxation, i.e., a depolarization rate greater than 1 sec/sup -1/. Materials having these properties include hydrogenated and deuterated amorphous semiconductors. A method for preventing the rapid depolarization of a polarized plasma in a fusion device may comprise the step of providing a first-wall or first-wall coating formed of a low-Z, non-metallic material having a depolarization rate greater than 1 sec/sup -1/.

Inventors:
; ;
Publication Date:
Research Org.:
Princeton Univ., NJ (USA)
OSTI Identifier:
5200254
Application Number:
ON: DE85017784
Assignee:
Dept. of Energy ERA-10-053076; EDB-85-169298
DOE Contract Number:
AC02-76CH03073
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; FIRST WALL; COATINGS; THERMONUCLEAR FUELS; POLARIZATION; SPIN ORIENTATION; FUELS; ORIENTATION; THERMONUCLEAR REACTOR WALLS; 700201* - Fusion Power Plant Technology- Blanket Engineering; 700205 - Fusion Power Plant Technology- Fuel, Heating, & Injection Systems

Citation Formats

Greenside, H.S., Budny, R.V., and Post, D.E. Jr.. First wall for polarized fusion reactors. United States: N. p., 1985. Web.
Greenside, H.S., Budny, R.V., & Post, D.E. Jr.. First wall for polarized fusion reactors. United States.
Greenside, H.S., Budny, R.V., and Post, D.E. Jr.. 1985. "First wall for polarized fusion reactors". United States. doi:.
@article{osti_5200254,
title = {First wall for polarized fusion reactors},
author = {Greenside, H.S. and Budny, R.V. and Post, D.E. Jr.},
abstractNote = {A first-wall or first-wall coating for use in a fusion reactor having polarized fuel may be formed of a low-Z non-metallic material having slow spin relaxation, i.e., a depolarization rate greater than 1 sec/sup -1/. Materials having these properties include hydrogenated and deuterated amorphous semiconductors. A method for preventing the rapid depolarization of a polarized plasma in a fusion device may comprise the step of providing a first-wall or first-wall coating formed of a low-Z, non-metallic material having a depolarization rate greater than 1 sec/sup -1/.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1985,
month = 1
}
  • Depolarization mechanisms arising from the recycling of the polarized fuel at the limiter and the first-wall of a fusion reactor are greater than those mechanisms in the plasma. Rapid depolarization of the plasma is prevented by providing a first-wall or first-wall coating formed of a low-Z, non-metallic material having a depolarization rate greater than 1 sec.sup.-1.
  • A fusion reactor is described comprising: a plasma fuel having polarized nuclei; and a first wall, the first wall including a coating formed of a material selected from the group consisting of a hydrogenated amorphous semiconductor and a deuterated amorphous semiconductor and wherein the coating has a varied porosity and further including small amounts of a nitrogen dopant in the coating.
  • A system for forming a thick flowing liquid metal, in this case lithium, layer on the inside wall of a toroid containing the plasma of a deuterium-tritium fission reactor. The presence of the liquid metal layer or first wall serves to prevent neutron damage to the walls of the toroid. A poloidal current in the liquid metal layer is oriented so that it flows in the same direction as the current in a series of external magnets used to confine the plasma. This current alignment results in the liquid metal being forced against the wall of the toroid. After themore » liquid metal exits the toroid it is pumped to a heat extraction and power conversion device prior to being reentering the toroid.« less
  • A system for forming a thick flowing liquid metal, in this case lithium, layer on the inside wall of a toroid containing the plasma of a deuterium-tritium fusion reactor. The presence of the liquid metal layer or first wall serves to prevent neutron damage to the walls of the toroid. A poloidal current in the liquid metal layer is oriented so that it flows in the same direction as the current in a series of external magnets used to confine the plasma. This current alignment results in the liquid metal being forced against the wall of the toroid. After themore » liquid metal exits the toroid it is pumped to a heat extraction and power conversion device prior to being reentering the toroid.« less
  • The first wall of a deuterium--tritium fusion reactor is regenerated in situ. The first wall substantially surrounds an enclosed reaction region confined within the reaction chamber of the reactor. To regenerate a worn first wall without opening the reactor chamber, a gaseous substance is introduced into the chamber, at least a portion of the gaseous substance comprising material, such as low Z refractory material, suitable for forming the first wall. At least a portion of this material is deposited, as by pyrolysis, in solid form on the first wall to regenerate the first wall, and residual gas is removed frommore » the chamber. The chamber is then recharged with a mixture of deuterium and tritium. All the while the inflow of contaminants into the chamber is substantially excluded. Preferably, the pyrolysis of the gaseous substance is effected by energizing the coils used in the operation of the reactor for producing a plasma of deuterium and tritium ions in the reaction chamber.« less