Recent progress in JT-60U experiments

In JT-60U, the highest fusion product of 1.2 x 1021 k e V~m -~ was recorded in July 1994, and the confinement performance has bcen also improved in the quasi-steady states (duration time -1.5s). The JT-60U has various wall conditioning methods. In particular, boronization system using decaborane and B4C-converted CFC divertor tiles were effective for reduction of the oxygen impurity and particle recycling. In the latest boronization session, gas mixture of deuterium and helium was used in glow discharge instead of helium only to reduce the hydrogen content in the boron film. On the other hand, the B4C-converted CFC tiles caused, so called, the real-time solid target boronizatilon (STB) by plasma impact, and then low concentration level of impurities was achieved. Water cooling of the divertor tiles, which was carricd out in Octobcr 1994, was also effective for the reduction of impurity production.The amount of neutron and tritium generated by D-D reaction have also increased with the improved plasma performance. From the measurement of the tritium in the first wall tiles, it is expected that tritium of 1.6 x 1O' O Bq, which corresponds to approximately 50% of tritium generated until 1993, still remained in the first wall.

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Recent progress in JT-60U experiments

Cited by 4 publications

References 19 publications

Potential of neutron excess generation by DD-fusion in SCNES

Potential of neutron excess generation by DD-fusion in SCNES

Engineering analysis of JET operation

Development and operation of first wall in JT-60U high-power heated discharges

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