Study of Alpha Physics Related to ITER Project. Progress Report, 1 November 1993--31 October 1994 PDF Download
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Languages : en
Pages : 7
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A critical issue in the controlled fusion program is the understanding of alpha particle confinement in an ignited tokamak plasma. The standard ignition scenario in a burning plasma is that alpha particles are born at 3.5 Mev, and heat the background plasma as they transfer this energy by electron drag during the time they slow down. However, several experiments have already demonstrated that if Alfven waves are excited by the presence of fast particles, the wave fields can cause rapid particle loss through radial diffusion. If such processes arise in a reactor, the entire methodology of planning what ignition conditions should be like, needs to be strongly modified. Hence, the understanding of the Alfven-alpha particle interaction is one of the most significant issues that can be addressed as the plasma physics community prepares for an ITER experiment to demonstrate controlled fusion conditions. Should Alfven wave excitations be present in a burning reactor, an appropriate method of analysis needs to be developed. The past year, the research team, working with the P.I. of this contract, has developed a method of analysis that should be appropriate for this problem. During the past year a numerical tool was successfully developed for a model problem that contains physics properties similar to the Alfven-alpha particle problem. Work is now in progress for simulating the more realistic Alfven-alpha particle problem.
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Category :
Languages : en
Pages : 7
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Book Description
A critical issue in the controlled fusion program is the understanding of alpha particle confinement in an ignited tokamak plasma. The standard ignition scenario in a burning plasma is that alpha particles are born at 3.5 Mev, and heat the background plasma as they transfer this energy by electron drag during the time they slow down. However, several experiments have already demonstrated that if Alfven waves are excited by the presence of fast particles, the wave fields can cause rapid particle loss through radial diffusion. If such processes arise in a reactor, the entire methodology of planning what ignition conditions should be like, needs to be strongly modified. Hence, the understanding of the Alfven-alpha particle interaction is one of the most significant issues that can be addressed as the plasma physics community prepares for an ITER experiment to demonstrate controlled fusion conditions. Should Alfven wave excitations be present in a burning reactor, an appropriate method of analysis needs to be developed. The past year, the research team, working with the P.I. of this contract, has developed a method of analysis that should be appropriate for this problem. During the past year a numerical tool was successfully developed for a model problem that contains physics properties similar to the Alfven-alpha particle problem. Work is now in progress for simulating the more realistic Alfven-alpha particle problem.
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Category : Power resources
Languages : en
Pages : 486
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Category : Nuclear energy
Languages : en
Pages : 640
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Category : Science
Languages : en
Pages : 544
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Category : Aeronautics
Languages : en
Pages : 700
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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Category :
Languages : en
Pages : 1738
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Category :
Languages : en
Pages : 13
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This progress report covers the research on the {open_quotes}Study of Longitudinal Instability with an Electron Beam{close_quotes} performed at the University of Maryland during the period from September 1, 1993 to February 28, 1994 of the two-year grant sponsored by the Department of Energy, under Grant No. DEFG02-92ER54178. This research is motivated by the issue of longitudinal instability in induction linacs as drivers for heavy ion inertial fusion. The Fusion Policy Advisory Committee (FPAC) in its final report to DOE (September 1990) identified longitudinal instability as a key physics problem that needs to be solved if an induction linac is to be developed into a successful HIF driver. The FPAC report also stated that {open_quotes}in parallel{close_quotes} to the design and construction of ILSE {open_quotes}enhanced theoretical and experimental efforts are required for an improved understanding of potentially serious longitudinal beam instability issues{close_quotes}. The experiment with electron beams in this area is a low-cost way to gain a thorough understanding of the instability and to test computer codes in collaboration with LBL, LLNL, and I. Haber at NRL. The last six months saw the transition of the research activities from phase 1 to phase 2. By the end of last September, the experiments on space-charge waves had been completed. This had fulfilled the first year's goal of this two-year grant. Though the completion of the experiments was one month later than that scheduled and the data analysis still continues up to now, the authors have done much more than was originally proposed.
Author: National Academies of Sciences Engineering and Medicine
Publisher:
ISBN: 9780309685382
Category :
Languages : en
Pages :
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Fusion energy offers the prospect of addressing the nation's energy needs and contributing to the transition to a low-carbon emission electrical generation infrastructure. Technology and research results from U.S. investments in the major fusion burning plasma experiment known as ITER, coupled with a strong foundation of research funded by the Department of Energy (DOE), position the United States to begin planning for its first fusion pilot plant. Strong interest from the private sector is an additional motivating factor, as the process of decarbonizing and modernizing the nation's electric infrastructure accelerates and companies seek to lead the way. At the request of DOE, Bringing Fusion to the U.S. Grid builds upon the work of the 2019 report Final Report of the Committee on a Strategic Plan for U.S. Burning Plasma Research to identify the key goals and innovations - independent of confinement concept - that are needed to support the development of a U.S. fusion pilot plant that can serve as a model for producing electricity at the lowest possible capital cost.
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Category : Science
Languages : en
Pages : 2560
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Vols. for 1964- have guides and journal lists.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309272246
Category : Science
Languages : en
Pages : 247
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Book Description
The potential for using fusion energy to produce commercial electric power was first explored in the 1950s. Harnessing fusion energy offers the prospect of a nearly carbon-free energy source with a virtually unlimited supply of fuel. Unlike nuclear fission plants, appropriately designed fusion power plants would not produce the large amounts of high-level nuclear waste that requires long-term disposal. Due to these prospects, many nations have initiated research and development (R&D) programs aimed at developing fusion as an energy source. Two R&D approaches are being explored: magnetic fusion energy (MFE) and inertial fusion energy (IFE). An Assessment of the Prospects for Inertial Fusion Energy describes and assesses the current status of IFE research in the United States; compares the various technical approaches to IFE; and identifies the scientific and engineering challenges associated with developing inertial confinement fusion (ICF) in particular as an energy source. It also provides guidance on an R&D roadmap at the conceptual level for a national program focusing on the design and construction of an inertial fusion energy demonstration plant.
