Identification of Alfv{acute e}n mode location via multichannel interferometer measurements (abstract)

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1147925· OSTI ID:451841

Chang, Z; Fredrickson, E D; Park, H; Nazikian, R; Budny, R V; Wong, K L

Quasicoherent magnetohydrodynamics modes with an Alfv{acute e}n frequency scaling are seen routinely in TFTR neutral beam heated plasmas as well as some Ohmic plasmas. So far, they are only observed in external magnetic fluctuation measurement (Mirnov coils). A close correlation is observed between the changes in the mode frequency and electron density measured by the multichannel infrared interferometer. This correlation allows us to determine the location of the Alfv{acute e}n modes. The result shows that they are near the plasma edge, r/a{gt}0.85. This method is also used to identify the location of the toroidicity-induced Alfv{acute e}n eigenmode driven by fast ions in a radiowave heating experiment. The result is consistent with the location determined by the reflectometer measurement.{copyright} {ital 1997 American Institute of Physics.}

• Research Organization: Princeton Plasma Physics Laboratory
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 451841
• Report Number(s): CONF-960543--
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 68; ISSN RSINAK; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
ELECTRON DENSITY
INTERFEROMETRY
MAGNETOHYDRODYNAMICS
MHD EQUILIBRIUM
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
TFTR TOKAMAK
electromagnetic wave interferometry
plasma Alfven waves
plasma beam injection heating
plasma ohmic heating
plasma toroidal confinement