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The role of MHD in causing impurity peaking in JET hybrid plasmas.
- Source :
-
Nuclear Fusion . Jun2016, Vol. 56 Issue 6, p1-1. 1p. - Publication Year :
- 2016
-
Abstract
- In hybrid plasma operation in JET with its ITER-like wall (JET-ILW) it is found that n > 1 tearing activity can significantly enhance the rate of on-axis peaking of high-Z impurities, which in turn significantly degrades discharge performance. Core n = 1 instabilities can be beneficial in removing impurities from the plasma core (e.g. sawteeth or fishbones), but can conversely also degrade core confinement (particularly in combination with simultaneous n = 3 activity). The nature of magnetohydrodynamic instabilities in JET hybrid discharges, with both its previous carbon wall and subsequent JET-ILW, is surveyed statistically and the character of the instabilities is examined. Possible qualitative models for how the n > 1 islands can enhance the on-axis impurity transport accumulation processes are presented. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PLASMA gases
*MAGNETOHYDRODYNAMIC instabilities
*PLASMA flow
*PLASMA confinement
Subjects
Details
- Language :
- English
- ISSN :
- 00295515
- Volume :
- 56
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Nuclear Fusion
- Publication Type :
- Academic Journal
- Accession number :
- 115773769
- Full Text :
- https://doi.org/10.1088/0029-5515/56/6/066002