Multichannel electron cyclotron emission radiometry for magnetohydrodynamic mode studies in TEXTOR

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

DOI:https://doi.org/10.1063/1.1147758· OSTI ID:488781

Waidmann, G; de Vries, P C; Kraemer-Flecken, A ^[1]; Eulenberg, H P ^[2]; Huxhagen, K ^[3]

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1. Institut fuer Plasmaphysik, Forschungszentrum Juelich GmbH, Association EURATOM-KFA, D-52425 Juelich (Germany)
2. Zentrallabor fuer Elektronik, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany)
3. Institut fuer Hochfrequenztechnik, Mercator-Universitaet Duisburg, D-47048 Duisburg (Germany)

Localized magnetohydrodynamic modes occur frequently as precursors to dangerous plasma disruptions in tokamaks. Fast electron cyclotron emission (ECE) radiometry permits a space-resolved study of the dynamic behavior of these instabilities. Two types of multichannel, heterodyne ECE systems working on TEXTOR are briefly described. Temperature profile perturbations caused by tearing modes are shown. Typical T{sub e} fluctuations generated by rotating magnetic islands are presented. An early disruption warning system was built and tested on TEXTOR discharges. A real-time cross correlation calculation of two ECE signals is used to identify an m=2 mode. An analog alarm signal is generated then early during the instability evolution. An experimental test result is presented from a beam-heated tokamak plasma. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 488781
• Report Number(s): CONF-960543-; ISSN 0034-6748; TRN: 97:009952
• Journal Information: Review of Scientific Instruments, Vol. 68, Issue 1; Conference: 11. annual high-temperature plasma diagnostics conference, Monterey, CA (United States), 12-16 May 1996; Other Information: PBD: Jan 1997
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
TEXTOR TOKAMAK
PLASMA DIAGNOSTICS
RADIOMETERS
TEARING INSTABILITY
TOKAMAK DEVICES
PLASMA INSTABILITY
CYCLOTRON RADIATION
MICROWAVE RADIATION
HETERODYNE RECEIVERS
ELECTRON TEMPERATURE
PLASMA RADIAL PROFILES
FLUCTUATIONS
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC CONFINEMENT
MAGNETOHYDRODYNAMICS