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1 - Nuclear Sciences and Applications - IAEA

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<strong>IAEA</strong>-CN-50/A-VH-4 401<br />

1 1 1 1 1i<br />

|—i— 1 1 |<br />

li i —<br />

..li— 1 11 |r""\. —<br />

1 . . . » 1<br />

240_<br />

230<br />

2 =-<br />

4.00 4.05 4.10<br />

TIME (s)<br />

4.15 4.20<br />

FIG. 3. Limiter H-mode discharge on TFTR showing the edge Ha <strong>and</strong> n, signal with a transition at<br />

4.06 s, the beam injection from 3.5 to 4.3 s. A sawtooth is shown on the Te data at =*4.04 s <strong>and</strong> a<br />

400 eV increase in the edge Tt is observed after the transition.<br />

TFTK during supershot-like plasmas do not lead to an increase in TE (which is<br />

already greater than L-mode Tg )„ but rather a modest drop from the supershot<br />

level.<br />

6. MHD STABILITY CALCULATIONS<br />

The MHD properties of TFTR plasmas have been investigated with respect to<br />

both ideal <strong>and</strong> resistive MHD instabilities. The procedure requires appropriate<br />

modelling of the experimental discharge. This is done with the TRANSP code.<br />

The resultant safety-factor q(\y,t) <strong>and</strong> equivalent scalar pressure P(y,t) profiles

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