DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN
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| Title | 51: Study of chirping Alfvén eigenmodes in DIII-D | ||
| Name: | Mario Podesta mpodesta@pppl.gov | Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | Energetic Particles | Presentation time: | Not requested |
| Co-Author(s): | DIII-D EP group | ITPA Joint Experiment : | Yes |
| Description: | Identify critical parameters regulating the dynamics of bursting/chirping TAE/RSAE modes in DIII-D, with focus on AI startups. | ITER IO Urgent Research Task : | No |
| Experimental Approach/Plan: | Reproduce baseline discharge 144889 with bursting/chirping AEs. Study the dependence of AE dynamics on fast ion and plasma parameters through scans of toroidal field and NB parameters (injection voltage, injection geometry at fixed total NB power). Map out conditions for the development of AEs from quasi-stationary to bursting/chirping. Time permitting, establish connection to NSTX scenarios, where bursting/chirping AEs are commonly observed, by lowering the magnetic field (~0.6 T). | ||
| Background: | AE modes showing amplitude bursts and/or frequency chirping can develop into the extreme case when so-called 'avalanches' occur, with greatly enhanced fast ion transport and losses. Bursting/chirping AE instabilities in the TAE/RSAE frequency range were recently observed in "advance inductive" startup scenarios on DIII-D. This study will investigate the conditions leading to the development of strong AE bursts/chirps and its impact on fast ion transport. | ||
| Resource Requirements: | Variable mix of NB sources (co- vs. counter, different NB injection energies)
Scenarios at low magnetic field, approaching the standard values of NSTX (~0.55 T), may be included in the experimental plan. | ||
| Diagnostic Requirements: | Fast ion diagnostics (neutrons, FIDA, FILD). Internal mode structure measurements (ECEI, BES). Profile diagnostics (Thomson, CER, MSE). | ||
| Analysis Requirements: | EFIT, TRANSP, NOVA. Possibly FIDASIM. | ||
| Other Requirements: | -- | ||
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