Summary results from DIII-D NTM control and snowflake divertor experiments are presented
Event details
| Date | 24.01.2013 |
| Hour | 15:00 › 16:00 |
| Speaker | Dr. E. Kolemen |
| Location |
PPB 019
|
| Category | Conferences - Seminars |
Real time steerable electron cyclotron current drive (ECCD) has been demonstrated to reduce the power requirements and time needed to remove 3/2 and 2/1 neoclassical tearing modes (NTM) in the DIII-D tokamak. In a world-first demonstration of the techniques required in ITER, the island formation onset is detected automatically, gyrotrons are turned on, and the real-time steerable ECCD launcher mirrors are moved promptly to drive current at the location of the islands to shrink and suppress the modes well before saturation using real-time motional Stark effect (MSE) constrained equilibria reconstruction with advanced feedback and search algorithms. This method reduces the ECCD energy requirement and so raises Q by keeping the EC system off when the NTM is not present. Further, in the experiments with accurate tracking of pre-emptive ECCD to resonant surfaces, both 3/2 and 2/1 modes are prevented from appearing with up to five times less ECCD power.
Recent DIII-D results using the snowflake divertor configuration show significantly reduced (a) inter-ELM peak heat flux and (b) energy loss per ELM without pedestal pressure reduction as predicted theoretically. This supports the snowflake configuration as a promising solution for divertor heat load mitigation in present and future high-power magnetic confinement devices.
Recent DIII-D results using the snowflake divertor configuration show significantly reduced (a) inter-ELM peak heat flux and (b) energy loss per ELM without pedestal pressure reduction as predicted theoretically. This supports the snowflake configuration as a promising solution for divertor heat load mitigation in present and future high-power magnetic confinement devices.
Practical information
- Informed public
- Free
Organizer
- Prof. P. Ricci
Contact
- Prof. P. Ricci