High-harmonic ion cyclotron heating and current drive in ultra-small aspect ratio tokamaks

PDF Version Also Available for Download.

Description

Ultra-small aspect ratio tokamaks present a totally new plasma environment for heating and current drive experiments and involve a number of physics issues that have not previously been explored. These devices operate at low magnetic field and relatively high density so that the effective dielectric constant of the plasma to high harmonic fast waves (HHFW), is quite high, and perpendicular wavelength of fast waves is very short. {lambda} {approximately} 2.0 cm compared with {lambda} - 10-20 cm. This makes possible strong electron absorption at high harmonics of the ion cyclotron frequency, {Omega}{sub i}, and at fairly high phase velocity in ... continued below

Physical Description

7 p.

Creation Information

Batchelor, D.B.; Jaeger, E.F.; Carter, M.D. & Berry, L.A. November 1, 1996.

Context

This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 12 times . More information about this article can be viewed below.

Who

People and organizations associated with either the creation of this article or its content.

Sponsor

Publishers

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this article. Follow the links below to find similar items on the Digital Library.

Description

Ultra-small aspect ratio tokamaks present a totally new plasma environment for heating and current drive experiments and involve a number of physics issues that have not previously been explored. These devices operate at low magnetic field and relatively high density so that the effective dielectric constant of the plasma to high harmonic fast waves (HHFW), is quite high, and perpendicular wavelength of fast waves is very short. {lambda} {approximately} 2.0 cm compared with {lambda} - 10-20 cm. This makes possible strong electron absorption at high harmonics of the ion cyclotron frequency, {Omega}{sub i}, and at fairly high phase velocity in relation to electron thermal velocity. If the antenna system can control the parallel wave spectrum, this offers the promise of high efficiency off-axis current drive and the possibility for current drive radial profile control. Antenna phasing is ineffective for profile control in conventional tokamaks because of central absorption. There are also challenges for antenna design in this regime because of the high dielectric constant and the large angle of the magnetic field with respect to the equatorial plane ({approximately}45{degrees}), which varies greatly during current ramp. Preliminary experiments in this HHFW regime are being carried out in CDX-U.

Physical Description

7 p.

Notes

INIS; OSTI as DE97000329

Source

  • 16. International Atomic Energy Agency (IAEA) international conference on plasma physics and controlled nuclear fusion research, Montreal (Canada), 7-11 Oct 1996

Language

Item Type

Identifier

Unique identifying numbers for this article in the Digital Library or other systems.

  • Other: DE97000329
  • Report No.: CONF-961005--7
  • Grant Number: AC05-96OR22464;AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 390599
  • Archival Resource Key: ark:/67531/metadc676092

Collections

This article is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this article?

When

Dates and time periods associated with this article.

Creation Date

  • November 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

Description Last Updated

  • May 2, 2016, 3:51 p.m.

Usage Statistics

When was this article last used?

Yesterday: 0
Past 30 days: 3
Total Uses: 12

Interact With This Article

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Batchelor, D.B.; Jaeger, E.F.; Carter, M.D. & Berry, L.A. High-harmonic ion cyclotron heating and current drive in ultra-small aspect ratio tokamaks, article, November 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc676092/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.