Measurement of neutral beam profiles at DIII-D Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.


  • Main Title Measurement of neutral beam profiles at DIII-D


  • Author: Chiu, H.
    Creator Type: Personal


  • Sponsor: United States. Department of Energy. Office of Energy Research.
    Contributor Type: Organization
    Contributor Info: USDOE Office of Energy Research, Washington, DC (United States)


  • Name: General Atomic Company
    Place of Publication: San Diego, California
    Additional Info: General Atomics, San Diego, CA (United States)


  • Creation: 1998-06-01


  • English


  • Content Description: The neutral beam systems of DIII-D, a National Fusion Facility at General Atomics, are used both for heating the plasma, and as tools for plasma diagnostics. The spatial distribution (profile) and energy of the beam is used in the absolute calibration of both the Charge Exchange Recombination (CER) and Motional Stark Effect (MSE) diagnostics. In the past, the beam spatial profile used in these calibrations was derived from beam divergence calculations and IR camera observations on the tokamak centerpost target tiles. Two experimental methods are now available to better determine the beam profile. In one method, the Doppler shifted D{sub {alpha}} light from the energetic neutrals are measured, and the full-width at half-maximum (FWHM) of the beam can be inferred from the measured divergence of the D{sub {alpha}} light intensity. The other method for determining the beam profile uses the temperature gradients measured by the thermocouples mounted on the calorimeter. A new iterative fitting routine for the measured thermocouple data has been developed to fit theoretical models on the dispersion of the beam. The results of both methods are compared, and used to provide a new experimental verification of the beam profile.
  • Physical Description: 5 p.


  • Keyword: Calibration
  • Keyword: Plasma Diagnostics
  • Keyword: Data Processing
  • Keyword: Atomic Beams
  • STI Subject Categories: 70 Plasma Physics And Fusion
  • Keyword: Doublet-3 Device
  • Keyword: Neutral Beam Sources
  • Keyword: Molecular Beams
  • Keyword: Comparative Evaluations
  • Keyword: Beam Profiles
  • Keyword: Measuring Methods


  • Conference: Annual meeting of the American Nuclear Society, Nashville, TN (United States), 7-12 Jun 1998


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article


  • Text


  • Other: DE98007248
  • Report No.: GA--A22896
  • Report No.: CONF-980606--
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 639769
  • Archival Resource Key: ark:/67531/metadc690654


  • Display Note: INIS; OSTI as DE98007248