1 - Nuclear Sciences and Applications - IAEA

134 HT-6M GROUP
3. DISCUSSION
(keV)
1.0
0.8
0.6
0.4
0.2
n n
. i l i .
/
/
IT/-J»T--.
1
Te(r)
/
/
, . 1 . , . 1 , ill it Nil r
-20 -10 0.0 10 20 (cm)
FIG. 3. Profile of electron temperature.
30 32 34 (ins)
FIG. 4. Sawteeth from soft X-ray diodes.
(1) It is a main feature of SLD that Ne is only determined by the wall surface conditions
and is independent of Po. This was also our criterion for deciding
whether the discharge had entered the SLD region or not.
(2) Compared with continuous gas filling in normal density discharges, Te(r) was
peaked (Fig. 5(a)) and Ne(r) was flat (Fig. 5(b)) in SLD. Thus, the properties
were similar to those of gas puffing and consistent with the fact that the plasma
was entirely maintained by neutral gas diffusing from the wall.
(3) Owing to the suppression of sawteeth and MHD instabilities, the transport was
improved, a stable hot core was maintained and TE was increased to two to
four times the value given by Alcator scaling.