Infrared TV Camera for Ripple Loss Measurement

Ripple of the toroidal magnetic field causes the radial transport of fast ions, resulting in heat deposition on the first wall. This excursion of fast ions is called ripple loss. An infrared TV camera viewing the wall helps to measure the ripple loss and to study the physics of the loss.

[Diagnostic Method & Specifications]
Measure the wall temperature using an infrared TV camera with
a temperature resolution of 0.3 degree,
・ a spatial resolution of ~ 1cm, and
・ a time resolution of 16.7 ms (standard TV image; 60 fields/s).

[1] K. Tobita et al., 'Infrared TV measurement of fast ion loss on JT-60U', Review of Scientific Instruments, Vol. 66, 594 (1995).
[2] K. Tobita et al., 'Ripple induced fast ion loss and related effects in JT-60U', Nuclear Fusion, Vol. 35, 1585 (1995).