Engineering Aspects of Cryogenic Laser-Fusion Targets

Musinski, D. L.; Henderson, Thomas M.; Simms, R.; Pattinson, T. R.; Jacobs, R. B.

doi:10.1007/978-1-4613-9856-1_6

Cited by 2 publications

(8 citation statements)

References 8 publications

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“…Thus, a frozen lump of tritium self-heats and its temperature elevates. This self-heating drives mass redistribution in a target interior according to a model by Martin et al [3]. Simply, the tritium or a 50/50 deuterium/tritium mixture (D-T) sublimes from the thicker, warmer layers and refreezes on colder, thinner layers.…”

Section: Solid Fuel Targets For the Icf Reactormentioning

confidence: 99%

“…Simply, the tritium or a 50/50 deuterium/tritium mixture (D-T) sublimes from the thicker, warmer layers and refreezes on colder, thinner layers. The process is predicted to take place with a time constant given by r = H s / q where H s is the enthalpy of sublimation and q is the heat generated by the beta decay per unit volume [1,3]. For T 2 , the predicted time constant is r = 14.4 min at 19.6 K and it would be about 1.85 times as long for D-T. Work by Hoffer and Foreman [ 1 ] demonstrated that the process does indeed take place and at rates that are not inconsistent with the model [3].…”

Section: Solid Fuel Targets For the Icf Reactormentioning

confidence: 99%

“…The process is predicted to take place with a time constant given by r = H s / q where H s is the enthalpy of sublimation and q is the heat generated by the beta decay per unit volume [1,3]. For T 2 , the predicted time constant is r = 14.4 min at 19.6 K and it would be about 1.85 times as long for D-T. Work by Hoffer and Foreman [ 1 ] demonstrated that the process does indeed take place and at rates that are not inconsistent with the model [3]. Cryogenic, high gain targets for ICF power reactors based on this concept would offer substantial fabrication advantages.…”

Section: Solid Fuel Targets For the Icf Reactormentioning

confidence: 99%

“…The heat from the beta decay will drive sublimation of the D-T from regions of the interior where the D-T is thick to regions where the frozen D-T is thin. The layer should approach uniformity exponentially, with a time constant that depends on the 3 He content of the fuel. As a noncondensable gas, 3 He impedes the mass transfer of D-T inside the target.…”

Section: The Simpler Version Of the Wetted-foam Target [4]mentioning

confidence: 99%

“…The layer should approach uniformity exponentially, with a time constant that depends on the 3 He content of the fuel. As a noncondensable gas, 3 He impedes the mass transfer of D-T inside the target. The 3 He is swept to the colder surfaces by the D-T flow and there forms a diffusion barrier for the freezing D-T.…”

Section: The Simpler Version Of the Wetted-foam Target [4]mentioning

confidence: 99%

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Solid fuel targets for the ICF reactor

Foreman

Hoffer

1988

Nucl. Fusion

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The discovery that radioactively induced sublimation can drive a layer of frozen tritium to uniform thickness strongly influences the fabrication of targets for inertial confinement fusion (ICF) power reactors. Targets utilizing solid fuel layers, made uniform by this process and incorporating either a foam layer or a vapour barrier, offer clear fabrication advantages over previous, similar designs incorporating liquid fuel.

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Section: Solid Fuel Targets For the Icf Reactormentioning

confidence: 99%

Section: Solid Fuel Targets For the Icf Reactormentioning

confidence: 99%

Section: Solid Fuel Targets For the Icf Reactormentioning

confidence: 99%

Section: The Simpler Version Of the Wetted-foam Target [4]mentioning

confidence: 99%

Section: The Simpler Version Of the Wetted-foam Target [4]mentioning

confidence: 99%

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Solid fuel targets for the ICF reactor

Foreman

Hoffer

1988

Nucl. Fusion

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Laser compression and stability in inertial confinement fusion

McCrory

Soures

Verdon

et al. 1989

Plasma Phys. Control. Fusion

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Inertial confinement fusion (ICF) requires high compression of fusion fuel, to densities approaching loo0 times liquid density of deuterium-tritium (DT), at central temperatures in excess of 5 keV. The direct-drive approach to ICF is more energy efficient than indirect drive if the stringent drive symmetry and hydrodynamic stability requirements can be. met by a suitable laser irradiation and target design. Experiments using cryogenic fuel capsules in conjunction with distributed phase plates (DPPs) on the frequency-tripled OMEGA laser system have achieved compressed DT fuel densities in the 100-200 times liquid density regime, but the experiments exhibited deviations from onedimensional performance. The deviations are believed to result from nonuniform implosion of fuel and shell material due to irradiation nonuniformities not removed by the DPPs. Improvements in irradiation uniformity through the use of a new technique, smoothing by spectral dispersion (SSD), may lead to reduced hydrodynamic instability growth and nearly one-dimensional capsule performance. SSD allows high-efficiency frequency tripling in a solid-state laser system.

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Engineering Aspects of Cryogenic Laser-Fusion Targets

Cited by 2 publications

References 8 publications

Solid fuel targets for the ICF reactor

Solid fuel targets for the ICF reactor

Laser compression and stability in inertial confinement fusion

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