Development of a Radiative Divertor for DIII-D. PDF Download
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Category :
Languages : en
Pages : 51
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Author:
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Category :
Languages : en
Pages : 51
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Category :
Languages : en
Pages : 10
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Category :
Languages : en
Pages : 12
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DIII-D currently operates with a single- or double-null open divertor and graphite walls. Active particle control with a divertor cryopump has demonstrated density control, efficient helium exhaust, and reduction of the inventory of particles in the wall. Gas puffing of D2 and impurities has demonstrated reduction of the peak divertor beat flux by factors of 3--5 by radiation. A combination of active cryopumping and feedback-controlled D2 gas puffing has produced similar divertor heat flux reduction with density control. Experiments with neon puffing have shown that the radiation is equally-divided between a localized zone near the X-point and a mantle around the plasma core. The density in these experiments has also been controlled with cryopumping. These experimental results combined with modeling were used to develop the new Radiative Divertor for DIII-D. This is a double-null slot divertor with four cryopumps to provide particle control and neutral shielding for high-triangularity advanced tokamak discharges. UEDGE and DEGAS simulations, benchmarked to experimental data, have been used to optimize the design.
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Category : Aeronautics
Languages : en
Pages : 702
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Author: C. Varandas
Publisher: Elsevier
ISBN: 0444599754
Category : Science
Languages : en
Pages : 1057
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The objective of these proceedings was to provide a platform for the exchange of information on the design, construction and operation of fusion experiments. The technology which is being developed for the next step devices and fusion reactors was also covered.
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Category :
Languages : en
Pages : 16
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Vanadium alloys are attractive candidate structural materials for fusion power plants because of their potential for minimum environmental impact due to low neutron activation and rapid activation decay. They also possess favorable material properties for operation in a fusion environment. General Atomics (GA), in conjunction with Argonne National Laboratory (ANL) and Oak Ridge National Laboratory (ORNL), has developed a plan for the utilization of vanadium alloys as part of the Radiative Divertor (RD) upgrade for the DIII-D tokamak. The plan will be carried out in conjunction with General Atomics and the Materials Program of the US Department of Energy (DOE). This application of a vanadium alloy will provide a meaningful step in the development of advanced materials for fusion power devices by: (1) developing necessary materials processing technology for the fabrication of large vanadium alloy components, and (2) demonstrating the in-service behavior of a vanadium alloy (V-4Cr-4Ti) in a tokamak environment. The program consists of three phases: first, small vanadium alloy coupon samples will be exposed in DIII-D at positions in the vessel floor and within the pumping plenum region of the existing divertor structure; second, a small vanadium alloy component will be installed in the existing divertor, and third, during the forthcoming Radiative Divertor modification, scheduled for completion in mid-1997, the upper section of the new double-null, slotted divertor will be fabricated from vanadium alloy product forms. This program also includes research and development (R and D) efforts to support fabrication development and to resolve key issues related to environmental effects.
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Category : Metallurgy
Languages : en
Pages : 1628
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Author: Lawrence Livermore National Laboratory
Publisher:
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Category : Research
Languages : en
Pages : 264
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Author: William A. Bookless
Publisher: DIANE Publishing
ISBN: 9780788126147
Category :
Languages : en
Pages : 114
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Highlights the Laboratory's 1994 accomplishments in their mission areas and core programs -- economic competitiveness, national security, lasers, energy, the environment, biology and biotechnology, engineering, physics and space science, chemistry and materials science, computations, and science and math education.
Author: K. Herschbach
Publisher: Newnes
ISBN: 0444599738
Category : Technology & Engineering
Languages : en
Pages : 892
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Book Description
The objective of the Symposium on Fusion Technology (SOFT) conference is to set the stage for the exchange of information on the design, construction, and operation of fusion experiments and the technology which is being developed for the next-step devices and for fusion reactors. These proceedings therefore present an up-to-date and throrough review of the state-of-the art in this dynamic field.
