The Combined Effect of EPM and TAE Modes on Energetic Ion Confinement and Sawtooth Stabilization

Conference · Wed Nov 15 00:00:00 EST 2000

OSTI ID:768507

Bernabei, S; Budny, R; Fredrickson, E D; Gorelenkov, N N; Hosea, J C; Phillips, C K; White, R; Wilson, J R; Petty, C C; Pinsker, R I; Harvey, R W; Smirnov, P

It is shown in this paper for the first time, that the chirping Alfven instabilities observed mostly during ion cyclotron range of frequency (ICRF) heating have been positively identified as Energetic Particle Modes (EPM). This has been possible because of the detailed measurement of the q-profile with the MSE (motional Stark effect) diagnostic in DIII-D. The EPMs are shown to be the leading cause of the monster sawtooth crash. It is also shown that TAEs are excited either directly or indirectly by the EPMs and they cause fast ion losses. A scenario for the stabilization and the crash of the monster sawtooth and for the degradation of the ICRF heating efficiency at high power is presented.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 768507
• Report Number(s): PPPL-3503; TRN: US0005770
• Resource Relation: Conference: 18th International Atomic Energy Agency's (IAEA) Fusion Energy Conference 2000 (FEC-2000), Sorrento (IT), 10/04/2000--10/10/2000; Other Information: PBD: 15 Nov 2000
• Country of Publication: United States
• Language: English

Related Subjects

29 ENERGY PLANNING
POLICY AND ECONOMY
43 PARTICLE ACCELERATORS
CONFINEMENT
CYCLOTRONS
EFFICIENCY
HEATING
IAEA
ITALY
NUCLEAR ENERGY
STABILIZATION
STARK EFFECT
THERMONUCLEAR REACTORS