title: A flexible luminescent probe to monitor fast ion losses at the edge of the TJ-II stellarator.
abstract: A mobile luminescent probe has been developed to detect fast ion losses and suprathermal ions escaping from the plasma of the TJ-II stellarator device. The priorities for its design have been flexibility for probe positioning, ease of maintenance, and detector sensitivity. It employs a coherent fiber bundle to relay, to the outside of the vacuum chamber, ionoluminescence images produced by the ions that impinge, after entering the detector head through a pinhole aperture, onto a screen of luminescent material. Ionoluminescence light detection is accomplished by a charge-coupled device camera and by a photomultiplier, both of which are optically coupled to the in-vacuum fiber bundle head by means of a standard optical setup. A detailed description of the detector, and the first results obtained when operated close to the plasma edge, are reported.
authors.affiliation: Laboratorio Nacional de Fusion, Asociacion Euratom-CIEMAT, Avda. Complutense 22, E-28040 Madrid, Spain. d.jimenez@ciemat.es
authors.forename: D
authors.initials: D
authors.lastname: Jiménez-Rey
authors.forename: B
authors.initials: B
authors.lastname: Zurro
authors.forename: J
authors.initials: J
authors.lastname: Guasp
authors.forename: M
authors.initials: M
authors.lastname: Liniers
authors.forename: A
authors.initials: A
authors.lastname: Baciero
authors.forename: M
authors.initials: M
authors.lastname: García-Muñoz
authors.forename: A
authors.initials: A
authors.lastname: Fernández
authors.forename: G
authors.initials: G
authors.lastname: García
authors.forename: L
authors.initials: L
authors.lastname: Rodríguez-Barquero
authors.forename: J M
authors.initials: JM
authors.lastname: Fontdecaba