Sawtooth Precursor Oscillations on DIII-D
SCIE
SCOPUS
- Title
- Sawtooth Precursor Oscillations on DIII-D
- Authors
- Tobias, BJ; Domier, CW; Luhmann, NC; Boom, JE; Classen, IGJ; Donne, AJH; Gunsu Yun; Park, HK; Nazikian, RM
- Date Issued
- 2011-11
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS
- Abstract
- The sawtooth oscillation, observed in tokamak plasmas with a central safety factor of less than unity, is a periodic disruptive instability characterized by a slow ramping of central plasma density and temperature, followed by a fast relaxation resulting in flattening of both profiles. Elongated neutral-beam-heated discharges on the DIII-D tokamak exhibit multiple precursor oscillations with mode number m/n = 1/1. The dominant m/n = 1/1 mode oscillates at the plasma rotation frequency. A downshifted mode also appears early in the sawtooth ramp. A normalization of electron cyclotron emission imaging data that removes the contribution of slow electron temperature profile evolution reveals that both modes are consistent with an underlying quasi-interchange plasma displacement.
- Keywords
- Millimeter-wave radiometry; plasma confinement; plasma temperature; plasma transport processes
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15624
- DOI
- 10.1109/TPS.2011.2157535
- ISSN
- 0093-3813
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON PLASMA SCIENCE, vol. 39, no. 11, page. 3022 - 3023, 2011-11
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- There are no files associated with this item.
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