1. magnetic confinement - ENEA - Fusione

40
1. MAGNETIC CONFINEMENT
1.2 FTU Facilities
temperature (T ECE ) and
the TS temperature (T SC )
2
are in close agreement at
3.4 T, but during the
ramp the discrepancy
1.5
between the two
increases. The ratio of
(T ECE) / (T SC ) vs. the
1
magnetic field was
plotted for different B T
ramps (fig. 1.37); here, 0.5
the largest discrepancy
occurs between 5 T and
6 T. This behaviour is
0
reproducible, and the
4 6 8
same results were found
B T
after a new alignment of
the ECE collecting
1.8
system. Figure 1.38
shows the two calibration
campaigns in
1.6
different colours. The
data scattering is due to
the statistical noise on
1.4
the TS, connected with
fast temperature variations
during sawtooth
1.2
activity. The discrepancy
between the two
diagnostics is clearly
1
outside the data
scattering.
0.8
To check that there was
no implicit dependence
on electron temperature,
3 4 5 6
B T
7 8 9
the ratio T ECE /T SC was plotted for fixed magnetic 8
field vs. the temperature itself for a number of shots (fig.
1.39). The plots show that the discrepancy does not
depend on the electron temperature. In fact, the data
with the highest discrepancy (corresponding to 5-6 T)
6
have an intermediate temperature (light blue points in
fig. 1.39).
After the above analysis, the ECE data were recalibrated
on the TS temperature, using the smoothed
average curve of figure 1.38, for all the shots of the
analysis campaign.
Tece/Tsc
Tece/Tsc
Tece
4
2
Fig. 1.37 - ECE–TS temperature
ratio for
discharges with contiguous
B T scans vs B T .
Fig. 1.38 - TECE/TSC
ratio vs. the toroidal
magnetic field for the
two different calibration
campaigns.
Neutron diagnostics
The detector system based on the NE213 scintillators
used for the six-channel neutron camera was recalibrated
and is now routinely operating. An analysis
program was written in IDL programming language to
provide both neutron emission and ion temperature
0
0 2 4
Fig 1.39 - ECE temperature vs. TS temperature for
the shots of fig 1.34.
T sc