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TP-5 / PEP-14 QH/QDB plasma studies

JT-60U results prepared by Y. Sakamoto. TP-5 / PEP-14 QH/QDB plasma studies. JT-60U experiments were performed with participation from the DIII-D team (P. Gohil [on site], L. Lao [remote]). Main results in 2006 (with ferritic steel)

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TP-5 / PEP-14 QH/QDB plasma studies

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  1. JT-60U results prepared by Y. Sakamoto TP-5 / PEP-14QH/QDB plasma studies JT-60U experiments were performed with participation from the DIII-D team (P. Gohil [on site], L. Lao [remote]). Main results in 2006 (with ferritic steel) Outer GAP for producing QH-mode was similar to that w/o ferritic steel. EHO was observed in ECE and BES near the edge channel. Transitions of (QH to ELMy) / (ELMy to QH) were observed at the same toroidal rotation velocity. Radial electric field near the edge region was measured with new CXRS system.

  2. Critical toroidal rotation for QH mode • By changing the combination of tang-NB during discharges, the critical Vt was investigated. • Transitions of (QH to ELMy) / (ELMy to QH) were observed at the same Vtped ~ -2.3x104m/sec, which appears to indicate a lack of hysterisis in this quantity.

  3. Er profile in QH and ELMying during CO injection • QH mode with CO-injection was observed during GAP scan • Er profile was determined during the QH-mode and ELMing phases of the discharge. • In both cases the contribution to the Er profile at the edge is dominated by the poloidal rotation term, with the poloidal rotation term being slightly larger (and so also the Er well) just before an ELM than during the QH-mode. PNB Just before ELM QH phase CO-PNB nel Ddiv Outer gap Time (sec)

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