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1 - Nuclear Sciences and Applications - IAEA

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632 ITOH et al.<br />

1.0 20 30 40 50 60<br />

t (s)<br />

900<br />

40 80 120 160<br />

CHORD HEIGHT (mm)<br />

FIG. 3. Bulk plasma temperature during steady state LHCD operation: (a) time variation of ion <strong>and</strong><br />

electron temperatures at plasma centre; (b) ion temperature profile at t = 40 s.<br />

10*<br />

10 3<br />

.o 2<br />

; t=20s<br />

\ T=«5 keV<br />

10<br />

\ i<br />

• i '," ***,<br />

1<br />

c><br />

200 400<br />

E (keV)<br />

150<br />

|12O<br />

1 90<br />

a.<br />

> IP-<br />

^30<br />

TJ \<br />

0 -100 -7.5 -50 -25 0.0 2.5 50 75 10.0<br />

CHORD POSITION (cm)<br />

FIG. 4. Hard X-ray emission during the steady state LHCD operation: (a) photon energy spectrum at<br />

plasma centre; (b) emission profiles for three photon energies. Here, the centre of the chord position<br />

corresponds to a major radius of 0.84 m.<br />

This value is several times longer than the neo-Alcator confinement time obtained for<br />

a low density OH discharge (BT = 5 T, Ip < 40 kA, ri, < 1 X 10 13 cm" 3 ) in<br />

TRIAM-1M. Such an improvement of the energy confinement has been observed for<br />

the lower density region (n,

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