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1 - Nuclear Sciences and Applications - IAEA

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<strong>IAEA</strong>-CN-50/A-V-5 327<br />

500<br />

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i i i<br />

— 1 " 1 1 1 • •1<br />

300<br />

- // 200 OH + TH<br />

100<br />

- rr%<br />

OH only<br />

7°<br />

(b) -<br />

- 5<br />

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1 !<br />

fe) -<br />

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i t i i i i i<br />

0.0 0.2 0.4 O.G 0.8<br />

*• At (msl<br />

FIG. 4. Effects of turbulent heating current pulse in STOR-1M. (a) Overall current waveform,<br />

(b) details of current pulse <strong>and</strong> loop voltage, (c) evolution of toroidal current density profile, (d) electron<br />

density <strong>and</strong> (e) temperature after current pulse. BT = 1.0 T. Vm (turbulent heating capacitor voltage)<br />

= 4.0 kV in (a,b) <strong>and</strong> 3.0 kV in (c,d).<br />

The electron density <strong>and</strong> temperature after the current pulse have been<br />

observed to significantly increase as shown in Figs 4d <strong>and</strong> 4e, respectively. The<br />

delayed electron heating has also been observed in TORTUR [4]. After the<br />

current pulse, ohmic heating is the only energy input, <strong>and</strong> the global energy<br />

confinement improves by a factor almost 5 (see Fig. 5a). The maximum pp<br />

(poloidal beta) achieved in ST0R-1M is 3.2 without apparent sign of saturation<br />

with the current pulse amplitude.<br />

The improved confinement after the current pulse is accompanied by<br />

significant reduction in MHD activities <strong>and</strong> low frequency (f < 500 kHz) density<br />

10

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