Observation of ELM suppression in hybrid discharges using n = 3 magnetic perturbations on DIII-D
Journal Article
·
· Nuclear Fusion
- General Atomics, San Diego, CA (United States)
- Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of California, Los Angeles, CA (United States)
- Univ. of California, San Diego, CA (United States)
Large type-I edge localized modes (ELMs) are completely suppressed in hybrid discharges for the first time by applying an edge resonant perturbation (RMP) using an internal coil set with toroidal mode number n = 3. This is an important advance in developing hybrid discharges as a baseline operating scenario for ITER. In these experiments on the DIII-D tokamak, the ELM suppression lasts for ~1 s in plasmas with normalized beta up to βN = 2.5 (volume average beta up to β = 3.4%) and a fusion performance factor as high as βN H98y2/q952=0.20 , which equals the value for the Q = 10 scenario in ITER. A strong interaction between the 3/2 neoclassical tearing mode and the RMP, which slows the pedestal toroidal rotation, limits the achievable βN and the duration of ELM suppression.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI ID:
- 1170952
- Journal Information:
- Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 2 Vol. 50; ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
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