ICRH Current Ramp Discharges and Alfven Cascades in Alcator C-Mod

Journal Article · Mon Sep 26 04:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2098206· OSTI ID:20726290

Porkolab, M; Edlund, E; Snipes, J; Wukitch, S; Basse, N; Bonoli, P; Boswell, C; Fiore, C; Hubbard, A; Lin, L; Lin, Y; Marmar, E ^[1]; Gorelenkov, N; Kramer, G J; Schilling, G ^[2]

---

1. MIT Plasma Science and Fusion Center, Cambridge, MA 02139 (United States)
2. Princeton Plasma Physics Laboratory, Princeton, NJ 08540 (United States)

Current ramp experiments with intense ICRF power injected early in the ramp phase in Alcator C-Mod have been carried out. The goal of these experiments is to produce suitable reversed shear (RS) target plasmas for future Advanced Tokamak (AT) plasma research. Future plans call for off-axis injection of Lower Hybrid current drive (LHCD) to maintain the RS plasmas while increasing beta with additional ICRH. In the present experiments evidence of RS q-profiles has been demonstrated in the ramp stage of the discharge with the observation of Alfven-Cascades (or Reversed Shear Alfven-Eigenmodes or RSAE) driven by the energetic ICRF ion tail. The frequencies are in agreement with MHD code predictions. Evidence of sawtooth delay has also been observed by increasing the injected ICRF power.

• OSTI ID: 20726290
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 787; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALCATOR DEVICE
ALFVEN WAVES
ELECTRIC CURRENTS
ICR HEATING
ION CYCLOTRON-RESONANCE
IONS
LOWER HYBRID CURRENT DRIVE
MAGNETOHYDRODYNAMICS
PLASMA
PLASMA INSTABILITY
REVERSED SHEAR
RF SYSTEMS
SAWTOOTH OSCILLATIONS