Abstract
Measurements from balanced or slightly unbalanced, double-null, ELMing H-mode plasmas show that the upper, more closed, divertor strike point particle fluxes are larger than the lower, more open, divertor strike point particle fluxes for comparable conditions. Comparison of the upper and lower outer strike point peak particle fluxes measured with Langmuir probes during scans of the magnetic balance shows an asymmetry around the magnetic balance point which is consistent with both the enhanced upper recycling and the expected direction of private region E × B drifts. Comparison of the inner and outer peak particle fluxes in the upper divertor shows a dependence on magnetic field direction that is also consistent with the private region E × B drift direction.
Original language | English |
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Pages (from-to) | 1258-1261 |
Number of pages | 4 |
Journal | Journal of Nuclear Materials |
Volume | 313-316 |
Issue number | SUPPL. |
DOIs | |
State | Published - Mar 2003 |
Event | Plasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan Duration: May 26 2002 → May 31 2002 |
Funding
Work supported by US Department of Energy under contracts DE-AC04-94AL85000, DE-AC03-99ER54463, W-7405-ENG-48 and DE-AC05-00OR22725.
Keywords
- Double-null
- Langmuir probes
- Magnetic balance
- Particle flux
- Recycling
- Tokamak