LHD実験研究の最近の進展

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In the third campaign (07.13.99-12.14.99) of the LHD experiment, NBI(≤4.2MW), ICRF(≤1.4MW) and ECRH(≤0.9MW) were used to heat the plasma. Carbon tiles were installed as divertor plates, resulting in a significant reduction in the concentration of metal (Fe) impurities. The maximum field used in the experiment was 2.9T. Upgrading of the key hardware systems led to (i) higher central electron temperature [T_e(0)=4.4keV at <n_e>=5.3×10^<18>m^<-3> and P_<abs>=1.8MW], (ii) higher confinement [τ_E=0.3s at <n_e>=6.5×10^<19> m^<-3> and P_<abs>=2.0MW], (iii) higher stored energy [W^<dia>_p=0.88MJ], and (iv) higher average beta [<β>^<dia>=2.4% at B=1.3T]. The edge transport barrier enhances confinement significantly (50% higher than the ISS95 scaling). ICRF heating was found to be as efficient as NBI heating. Long pulse discharges (80sec NBI shot, 68sec ICRF shot) were achieved without difficulty.
2000-05-25