1 - Nuclear Sciences and Applications - IAEA

1
10"
IAEA-CN-50/A-VI1-12
LCFS LCFS
(magnetics) (exper.)
# 15431
20 40 60 80
SOL Distance (mm)
} 3 MA; 3.4 T
OHMIC
ICRH
(12 MW)
100
ICRH
(12 MW)
OHMIC
20 40 60 80 100
SOL Distance (mm)
FIG. 3. Reciprocating probe measurements ofne(r) and Tc(r) in one Ohmic and one Ohmic + ICRH
discharge of /„ = 3 MA; BT = 3.4 T, PICRH = 12 MW.
telescopes and transmitted by means of a quartz optical fibre
(100 m) to spectrometers or detectors equipped with narrow band
interference filters. Using atomic constants the influx can be
derived from the spectroscopic line intensities and the measured
density and temperature profiles. The telescopes observe only a
small part of the interaction area. Usually simultaneous
measurements of hydrogen, impurities and continuum (for
are taken [7] .
The ratio of carbon to deuterium influx is also obtained
experimentally from spectroscopy (Fig. 5). In steady state the
local recycling must be close to R=l and the deuterium influx
must be equal to the flux onto the surface. The data refer to a
series of discharges where density flat-tops at various values
were obtained after pellet injection. Both calculated and
spectroscopic results show a decreasing trend with
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