Lower Hybrid Current Drive for Edge Current Density Modification in DIII-D

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Total Pages : 52 pages
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Download or read book Lower Hybrid Current Drive for Edge Current Density Modification in DIII-D written by and published by . This book was released on 1993 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Application of Lower Hybrid (LH) Current Drive (CD) in the DIII-D tokamak has been studied at LLNL, off and on, for several years. The latest effort began in February 1992 in response to a letter from ASDEX indicating that the 2.45 GHz, 3 MW system there was available to be used on another device. An initial assessment of the possible uses for such a system on DIII-D was made and documented in September 1992. Multiple meetings with GA personnel and members of the LH community nationwide have occurred since that time. The work continued through the submission of the 1995 Field Work Proposals in March 1993 and was then put on hold due to budget limitations. The purpose of this document is to record the status of the work in such a way that it could fairly easily be restarted at a future date. This document will take the form of a collection of Appendices giving both background and the latest results from the FY 1993 work, connected by brief descriptive text. Section 2 will describe the final workshop on LHCD in DIII-D held at GA in February 1993. This was an open meeting with attendees from GA, LLNL, MIT and PPPL. Summary documents from the meeting and subsequent papers describing the results will be included in Appendices. Section 3 will describe the status of work on the use of low frequency (2.45 GHZ) LH power and Parametric Decay Instabilities (PDI) for the special case of high dielectric in the edge regions of the DIII-D plasma. This was one of the critical issues identified at the workshop. Other potential issues for LHCD in the DIII-D scenarios are: (1) damping of the waves on fast ions from neutral beam injection, (2) runaway electrons in the low density edge plasma, (3) the validity of the WKB approximation used in the ray-tracing models in the steep edge density gradients.

Lower Hybrid Counter Current Drive for Edge Current Density Modification in DIII-D.

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Total Pages : 6 pages
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Download or read book Lower Hybrid Counter Current Drive for Edge Current Density Modification in DIII-D. written by and published by . This book was released on 1993 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Each of the Advanced Tokamak operating modes in DIII-D is thought to have a distinctive current density profile. So far these modes have only been achieved transiently through experiments which ramp the plasma current and shape. Extension of these modes to steady state requires non-inductive current profile control, e.g. with lower hybrid current drive (LHCD). Calculations of LHCD have been done for DIII-D using the ACCOME and CQL3D codes, showing that counter driven current at the plasma edge can cancel some of the undesirable edge bootstrap current and potentially extend the VH-mode. Results are presented for scenarios using 2.45 GHz LH waves launched from both the midplane and off-axis ports. The sensitivity of the results to injected power, n{sub e} and T{sub e}, and launched wave spectrum is also shown.

Scientific and Technical Aerospace Reports

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Total Pages : 704 pages
Book Rating : 4.:/5 (31 download)

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Energy Research Abstracts

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Total Pages : 782 pages
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Government Reports Announcements & Index

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Energy and Water Development Appropriations for 2012: Dept. of Energy FY 2012 justifications (cont.)

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Total Pages : 1092 pages
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Book Synopsis Energy and Water Development Appropriations for 2012: Dept. of Energy FY 2012 justifications (cont.) by : United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development

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Energy and Water Development Appropriations for 2011, Part 3, February 2010, 111-2 Hearings

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Total Pages : 1284 pages
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Energy and Water Development Appropriations for 2011: Dept. of Energy fiscal year 2011 justifications (cont.)

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Book Synopsis Energy and Water Development Appropriations for 2011: Dept. of Energy fiscal year 2011 justifications (cont.) by : United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development

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107-2 Hearings: Energy and Water Development Appropriations For 2003, Part 4, 2002, *

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Energy and Water Development Appropriations for 2003

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Total Pages : 1440 pages
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Energy and Water Development Appropriations for 2003: Department of Energy ... National Nuclear Security Administration ... Power Marketing Administrations

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Welcome and Guide to Dunkeld Cathedral

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Government Reports Annual Index

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Total Pages : 1096 pages
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The DOE FY 99 Budget Authorization Request ; H.R. 1806, to Provide for the Consolidation of the DOE Offices of Fossil Energy, Renewable Energy, and Energy Efficiency ; S. 965, to Amend Title II of the Hydrogen Future Act of 1996

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Energy and Water Development Appropriations for 1993: Department of Energy FY 1993 budget justifications

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Total Pages : 1854 pages
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Physics Briefs

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Total Pages : 568 pages
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Energy and Water Development Appropriations For 2006, Part 4B, 109-1 Hearings, *.

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