Modeling The Effect of Drifts on the Edge  Scrape Off Layer  and Divertor Plasma in DIII D

Modeling The Effect of Drifts on the Edge Scrape Off Layer and Divertor Plasma in DIII D

Written by:

  • Publisher:
  • Publish Date: 2001
  • ISBN-10: OCLC:68221665
  • ebook-modeling-the-effect-of-drifts-on-the-edge-scrape-off-layer-and-divertor-plasma-in-diii-d-.pdf

In order to read or download eBook, you need to create FREE account.
eBook available in PDF, ePub, MOBI and Kindle versions

Recent Activity

Book Summary

Simulations of plasmas with a DIII-D shape indicate plasma drifts are important at power levels near the L- to H-mode plasma transition. In addition to enhancing plasma flows in the divertor region, drifts are found to play a key role in establishing highly sheared radial electric fields in the edge of the confined plasma, for the physics of the high confinement operating mode (H-mode). Measurements of the plasma structure in the vicinity of the X-point of DIII-D indicate the importance of drifts on plasma flow between the scrape-off layer (SOL) and closed field lines. The large electric fields provide large flows around the X-point, and these are conjectured to play a role in the transition from L- to H-mode confinement. These results indicate the relevance of modeling the edge and SOL plasmas of present tokamak devices using models which include E x B, (nabla)B, and pressure gradient drifts. The results of simulation of specific DIII-D discharges is reported in this paper. They start with discussion of the simulation of an Ohmic discharge in Section 2, including a study of the effect of varying several operational parameters. Simulation of a higher triangularity L-mode discharge is discussed in Section, and a summary is given in Section 4.

Members Online