A flexible luminescent probe to monitor fast ion losses at the edge of the TJ-II stellarator.
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.
Jiménez-Rey
D
D
Laboratorio Nacional de Fusion, Asociacion Euratom-CIEMAT, Avda. Complutense 22, E-28040 Madrid, Spain. d.jimenez@ciemat.es
Zurro
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B
Guasp
J
J
Liniers
M
M
Baciero
A
A
García-Muñoz
M
M
Fernández
A
A
García
G
G
Rodríguez-Barquero
L
L
Fontdecaba
J M
JM