Bounce Precession Fishbones in the National Spherical Tokamak Experiment

Technical Report · Fri Jun 27 00:00:00 EDT 2003

DOI:https://doi.org/10.2172/813691· OSTI ID:813691

Fredrickson, Eric; Chen, Liu; Eric Fredrickson, Roscoe White; White, Roscoe

Bursting modes are observed on the National Spherical Torus Experiment [M. Ono et al., Nucl. Fusion 40 (2000) 557], which are identified as bounce-precession-frequency fishbone modes. They are predicted to be important in high-current, low-shear discharges with a significant population of trapped particles with a large mean-bounce angle, such as produced by near-tangential beam injection into a large aspect-ratio device. Such a distribution is often stable to the usual precession-resonance fishbone mode. These modes could be important in ignited plasmas, driven by the trapped-alpha-particle population.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Science (SC) (US)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 813691
• Report Number(s): PPPL-3715; TRN: US0304021
• Resource Relation: Other Information: PBD: 27 Jun 2003
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASPECT RATIO
BEAM INJECTION
DISTRIBUTION
PRECESSION
BEAM PLASMA INTERACTIONS
FISHBONE INSTABILITY
SPHERICAL TOKAMAK