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Investigation of methods for fabricating, characterizing, and transporting cryogenic inertial-confinement-fusion tartets

Description: The objective of this work is to investigate methods for fabricating, characterizing and transporting cryogenic inertial confinement fusion targets on a continuous basis. A microprocessor-based data acquisition system has been built that converts a complete target image to digital data, which are then analyzed by automated software procedures. The low temperatures required to freeze the hydrogen isotopes contained in a target is provided by a cryogenic cold chamber capable of attaining 15 K. A new method for target manipulation and positioning is studied that employs molecular gas beams to levitate a target and an electrostatic quadrupole structure to provide for its lateral containment. Since the electrostatic target-positioning scheme requires that the targets be charged, preliminary investigation has been carried out for a target-charging mechanism based on ion-bombardment.
Date: January 1, 1981
Creator: Fanning, J.J. & Kim, K.
Partner: UNT Libraries Government Documents Department

Existence and lifetime of laser fusion pellets containing tritium

Description: Cryogenic pellets containing significant amounts of solid tritium cannot be maintained in a pure vacuum for longer than (typically) some tens of seconds because radiative cooling at low temperatures is inefficient. The steady state temperatures in typical one- and two-shell pellet designs both in vacuum and with external cooling, as well as the lifetimes of pellets following cooling removal, are calculated.
Date: May 1, 1979
Creator: Devaney, J.J.
Partner: UNT Libraries Government Documents Department

Tritium inventory of a target factor in an ICF power plant

Description: A preliminary parametric study has been performed to estimate the tritium inventory of a conjectured Target Factory. The inventory of a proposed tritiated fuel processing system was determined as a function of production efficiency, storage factor, and time interval for the slowest processing step. Results indicated that a study of this type will be beneficial in evaluating possible processing schemes for the production of tritiated laser fusion targets.
Date: May 7, 1981
Creator: Sherohman, J.W.
Partner: UNT Libraries Government Documents Department

Energy production due to the. mu. -catalized DT fusion process in a mixture of deuterium and tritium

Description: This study indicates the possible use of ..mu..-catalized fusion for energy production. Further work needs to be carried out on the effect of target temperature and on reducing the high energy cost for producing ..mu../sup -/ mesons which are required.
Date: January 1, 1981
Creator: Takahashi, H.
Partner: UNT Libraries Government Documents Department

Cooling of DT and T/sub 2/ cryogenic pellets within very low density plastics and by helium

Description: We have established previously that typical DT pellets cannot be kept solid with external cooling through pure vacuum, and can only be maintained solid within DT gas-filled spaces over a limited range of cooling temperatures. This report examines whether low-density (0.01 g/cm/sup 3/ or 0.05 g/cm/sup 3/) polyethylene foam or helium gas have sufficient conductivity to allow inner tritium-containing shells to be kept solid. For both conductors the answer is affirmative, but some uncertainty exists concerning the conductivity of foams and the worst excursions might not provide enough conductivity. For helium much less than one millitorr pressure suffices for cooling typical pellets. For cooling the same nuclear fuel concentrated in the form of a central ball, the lightest foams are marginal but might be satisfactory at the highest excursion of our conductivity error. Required helium pressures for ball cooling are in the region of a millitorr. A simple model for the ratio of foam to solid conductivity of a substance is developed.
Date: April 1, 1979
Creator: Devaney, J.J.
Partner: UNT Libraries Government Documents Department