Lower Hybrid Coupling Experiments on Alcator C-Mod

Journal Article · Fri Sep 28 04:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2800492· OSTI ID:21032773

Wallace, G; Bonoli, P; Parisot, A; Parker, R; Schmidt, A ^[1]; Wilson, J R ^[2]

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

The Alcator C-Mod Lower Hybrid Current Drive experiment launches RF waves at 4.6 GHz via 4 rows of 22 phased waveguides. Forward and reflected power is measured with 156 directional couplers in the launcher structure. Langmuir probes mounted to the front of the antenna monitor density at the plasma edge and act as RF probes for the observation of parametric decay instability. Measurements of the coupling of lower hybrid waves have been performed at power levels approaching 1 MW. Edge density, launched n{sub parallel} spectrum, and plasma shape have been adjusted to optimize coupling in L-mode plasmas. Experimentally observed coupling results will be compared to simulations from the Brambilla Grill code [1].

• OSTI ID: 21032773
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 933; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALCATOR DEVICE
ANTENNAS
COMPUTERIZED SIMULATION
COUPLING
DECAY INSTABILITY
GHZ RANGE
L-MODE PLASMA CONFINEMENT
LANGMUIR PROBE
LOWER HYBRID CURRENT DRIVE
LOWER HYBRID HEATING
MONITORS
PLASMA
PLASMA DENSITY
PLASMA SIMULATION
RF SYSTEMS
WAVEGUIDES