title: A line-of-sight electron cyclotron emission receiver for electron cyclotron resonance heating feedback control of tearing modes.
abstract: An electron cyclotron emission (ECE) receiver inside the electron cyclotron resonance heating (ECRH) transmission line has been brought into operation. The ECE is extracted by placing a quartz plate acting as a Fabry-Perot interferometer under an angle inside the electron cyclotron wave (ECW) beam. ECE measurements are obtained during high power ECRH operation. This demonstrates the successful operation of the diagnostic and, in particular, a sufficient suppression of the gyrotron component preventing it from interfering with ECE measurements. When integrated into a feedback system for the control of plasma instabilities this line-of-sight ECE diagnostic removes the need to localize the instabilities in absolute coordinates.
authors.affiliation: Forschungszentrum Jülich GmbH, Institut für Energieforschung-Plasmaphysik,Association EURATOM-FZJ, 52425 Jülich, Germany.
authors.forename: J W
authors.initials: JW
authors.lastname: Oosterbeek
authors.forename: A
authors.initials: A
authors.lastname: Bürger
authors.forename: E
authors.initials: E
authors.lastname: Westerhof
authors.forename: M R
authors.initials: MR
authors.lastname: de Baar
authors.forename: M A
authors.initials: MA
authors.lastname: van den Berg
authors.forename: W A
authors.initials: WA
authors.lastname: Bongers
authors.forename: M F
authors.initials: MF
authors.lastname: Graswinckel
authors.forename: B A
authors.initials: BA
authors.lastname: Hennen
authors.forename: O G
authors.initials: OG
authors.lastname: Kruijt
authors.forename: J
authors.initials: J
authors.lastname: Thoen
authors.forename: R
authors.initials: R
authors.lastname: Heidinger
authors.forename: S B
authors.initials: SB
authors.lastname: Korsholm
authors.forename: F
authors.initials: F
authors.lastname: Leipold
authors.forename: S K
authors.initials: SK
authors.lastname: Nielsen