Modification of hydrogen recycling due to edge ergodic magnetic layer in long tokamak discharge with high duty
Abstract
The effect of ergodic divertor (ED) on the particle balance in the plasma-wall system is investigated. It is found that in the short timescale 2-3 s at the beginning ED effectively increases the recycling wall area and enhances wall pumping by connecting the field lines to the wall. But in long timescale greater than several seconds ED brings an early termination of wall pumping due to the localization of recycling area around the X-region. A zero-dimensional model reproduces the observed behavior on the particle balance over the long timescale.
- Publication:
-
Journal of Nuclear Materials
- Pub Date:
- 1999
- DOI:
- 10.1016/S0022-3115(98)00857-5
- Bibcode:
- 1999JNuM..266.1118K