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JT-60U Experimental Report No. 33 (March 29, 1996)

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First Demonstration of Negative-Ion-Based Neutral Beam Injection into JT-60U Plasmas

The Negative-ion-based Neutral Beam Injection (NNBI) into tokamak plasmas has been successfully conducted for the first time at JT-60U in March 1996. Acceleration voltage, current, and pulse duration of the beam have reached 200 kV, 3.2 A, 0.47 s, respectively (400 kV, 13.5 A, 0.15 s in beam acceleration test).

The Negative-ion-based method is more efficient in producing neutral beams at high energies than the conventional positive-ion-based method, and therefore more beneficial for the heating and current drive of high-density core-plasmas.

The full capability of this system is 500 kV, 22A, 10 s. The heating and current drive experiments with this NNBI system will progress successively.

 

Plan view of the newly installed NNBI system.