1 - Nuclear Sciences and Applications - IAEA

: . • • 1
IAEA-CN-50/A-I-2 39
10 20 30
NEUTRAL BEAM POWER (MW)
• • : . ; • - . • . " •
Qoox2O0tP - Limit
i
i 1
0 10 20 30
I I
FIG. 9. Operating regions in the space described by plasma current and NBIpower in which significant
enhancements of the energy confinement time over L-mode scaling and high equivalent QDT are
observed.
6. Summary
I
W •m
NEUTRAL BEAM POWER (MW)
a
F
All Data
Oor>0.15
0 or >0.20
Oor>0.25
During the past year, substantial progress has been made in expanding
the operating range of supershots of TFTR. High-power and high-current
discharges have been achieved with values of TE/TJ^ ' of 2.5 - 3. The largest
enhancements in the confinement time are achieved in highly peaked discharges
which are near the /3-limit. The largest values of QDD and projected
value of QDT are achieved at high power and current. These results are
summarized in Fig. 9. By means of current ramps, it is possible to achieve
enhancements in the confinement time and large values of QDD away from
the /3-limit. The best results occur in discharges with a low initial target
density in which a very peaked density profile develops during NBI. Values