K." Nishimura

S. "Okamura

S. Nishimura

T. Minami

"Okamura,  S.

Minami,  T.

Nishimura,  S.

Nishimura,  K."

NIFS-Repository (National Institute for Fusion Science)

§ 14. Power Balance Analysis for Combined Heating of NBI and ICRF Okamura, S., Minami, T., Nishimura, S. , Nishimura, K. In the combination heating experiments, the increase of energy does not simply ensure the additional heading effect of ICRF because the increase of density and the broadening of its pro-file give higher absorption of NBI power. The power balance analysis is necessary to get the net heating effect ofiCRF. The analysis was made based on the measured profiles ofT e, ne and Ti with a profile analysis code PROC1R-mod. Figure 1 shows time traces of plasma para-meters. Times of profile measurements are indi-cated by arrows. Thermal energies are shown in Fig. 2 for these four measurement points. The calculated absorption power from NBI to both electrons and ions based on their profile mea-surements are also shown. As a limiting case that the ICRF does not give a net heating effect, the energy confinement times are calculated with the heating power only from NBI (Fig. 3). When the ICRF power input is included in the calculation, the calculated confine-ment times are more reasonable as shown in Fig. 4. The measured ICRF radiation power 300 kW is used in the calculation and the equal deposition to electrons and ions is assumed. 6 .., E # 43316 ..,u 4 ~0 ~ 4.-------~------~------~------~4 Bt = 1.7 T ~ 2 Q) c: w ICRF NBI injection Fig. 1 Time traces of combined heating discharge ::::;-~ >. OJ (i) c w (ij E (i) .r:. 1-3 2 0 ([) "0 0 (/) 1 6-Power to electron ::J --o- -o - - Power to ion ~ . - - - - - - -. - - - - - - - ·- - - - - - - ..... ~ 0 0 50 60 70 80 90 100 110 120 130 Time(ms) Fig. 2 Thermal energy of electron and ion with NBI absorption power 4 (i) .s 3 w :i <11 1-(ij 2 .0 0 (5 ICRF 300 kW 0 50 60 70 80 90 100 110 120 130 Time(ms) Fig. 3 Confinement times with no ICRF power net input assumed 4 (i) .s 3 w ::i <11 1-(ij 2 .D 0 (5 0 50 60 70 80 90 100 110 120 130 Time(ms) Fig. 4 Confinement times with ICRF power net input included 223 

Power Balance Analysis for Combined Heating of NBI and ICRF

Power Balance Analysis for Combined Heating of NBI and ICRF

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