TJ-II:Fast ion loss probe

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Fast Ion Loss Probe

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. [1] [2]

The probe is located in sector D3, at φ = -65º.


  1. C. Burgos et al, Conceptual designs of fast-ion loss detectors for the TJ-II stellarator, Rev. Sci. Instrum. 74 (2003) 1861
  2. D. Jiménez-Rey et al, A flexible luminescent probe to monitor fast ion losses at the edge of the TJ-II stellarator, Rev. Sci. Instrum. 79 (2008) 093511