Wall-conditioning plasmas by ECRF heating in KSTAR
Wall-conditioning plasmas by ECRF heating in KSTAR
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DOI：
10.1016/j.jnucmat.2013.01.202
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发表时间：
2013-07
影响因子：
3.1
通讯作者：
K. Itami;Suk-Ho Hong;Y. Bae;M. Matsukawa;W. C. Kim
中科院分区：
文献类型：
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作者：
K. Itami;Suk-Ho Hong;Y. Bae;M. Matsukawa;W. C. Kim
通过ECRF加热的壁调节等离子体（ECWC等离子体）在KSTAR的2010年和2011年的实验活动中进行了研究。将射频功率为200- 300 kW的110 GHz ECH脉冲注入真空容器中，该真空容器中充满了气压为10 ×10− 3 mbar的氦气。2010年，应用了ECH的二次谐波，发现垂直于环向场的ECRF波对于产生高密度等离子体至关重要，并且BHand BV的附加极向场图案显著改变了等离子体的均匀性。2011年，基本ECH应用于附加BH=0.02 T。ECWC等离子体向高环向场侧和低环向场侧径向延伸。20次ECWC等离子体脉冲（相当于ECWC持续7 min）成功地恢复了破裂后的第一壁。
Wall-conditioning plasmas by ECRF heating (ECWC plasmas) were investigated in KSTAR’s experimental campaigns of 2010 and 2011. Pulses of 110GHz ECH with an RF power of 200–300kW were injected into the vacuum vessel, which was filled with helium at a gas pressure ∼1×10−3mbar. In 2010, the second harmonic of ECH was applied and it was found that the ECRF wave normal to the toroidal field was essentially important for producing high-density plasmas and the uniformity of the plasma was significantly changed with an additional poloidal field pattern by BHand BV. In 2011, the fundamental ECH was applied with additional BH=0.02 T. The ECWC plasma extended radially toward both the high toroidal field side and low field side. The post-disruption first wall was successfully recovered by 20pulses of the ECWC plasmas, equivalent to ECWC for 7min.