title: Use of soft x-ray diagnostic on the COMPASS tokamak for investigations of sawteeth crash neighborhood and of plasma position using fast inversion methods.
abstract: The soft x-ray diagnostic is suitable for monitoring plasma activity in the tokamak core, e.g., sawtooth instability. Moreover, spatially resolved measurements can provide information about plasma position and shape, which can supplement magnetic measurements. In this contribution, fast algorithms with the potential for a real-time use are tested on the data from the COMPASS tokamak. In addition, the soft x-ray data are compared with data from other diagnostics in order to discuss possible connection between sawtooth instability on one side and the transition to higher confinement mode, edge localized modes and productions of runaway electrons on the other side.
authors.affiliation: Institute of Plasma Physics ASCR, Prague, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Imrisek
authors.affiliation: Institute of Plasma Physics ASCR, Prague, Czech Republic.
authors.forename: V
authors.initials: V
authors.lastname: Weinzettl
authors.affiliation: Institute of Plasma Physics ASCR, Prague, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Mlynar
authors.affiliation: Max-Planck-Institut für Plasmaphysik, Garching, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Odstrcil
authors.affiliation: Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Odstrcil
authors.affiliation: Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
authors.forename: O
authors.initials: O
authors.lastname: Ficker
authors.affiliation: Institue Jean Lamour, Université de Lorraine, Nancy, France.
authors.forename: J R
authors.initials: JR
authors.lastname: Pinzon
authors.affiliation: ENS Cachan, Paris, France.
authors.forename: C
authors.initials: C
authors.lastname: Ehrlacher
authors.affiliation: Institute of Plasma Physics ASCR, Prague, Czech Republic.
authors.forename: R
authors.initials: R
authors.lastname: Panek
authors.affiliation: Institute of Plasma Physics ASCR, Prague, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Hron