Radiative Divertor Plasma Behavior in L- and H-Mode Discharges with Argon Injection in EAST
Radiative Divertor Plasma Behavior in L- and H-Mode Discharges with Argon Injection in EAST
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DOI：
10.1088/1009-0630/15/7/02
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发表时间：
2013-07
影响因子：
1.7
通讯作者：
Dongsheng Wang;Houyang Y Guo;Yizi Shang;K. Gan;Huiqian Wang;Yingjie Chen;Shaocheng Liu;Liang Wang;W. Gao;L. Xiang;Zhenwei Wu;G. Luo
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文献类型：
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作者：
Dongsheng Wang;Houyang Y Guo;Yizi Shang;K. Gan;Huiqian Wang;Yingjie Chen;Shaocheng Liu;Liang Wang;W. Gao;L. Xiang;Zhenwei Wu;G. Luo
在导流器等离子体中引入强辐射杂质被认为是缓解ITER导流器靶板峰值热负荷的重要途径，将在EAST中用于高功率长脉冲操作。为此，在EAST首次在低(L)和高(H)模式约束下，通过注入氩气及其混合物（D2中25% Ar），探索了辐射分流器实验。在l模式放电中，Ar注入大大降低了转向器的粒子通量和热通量，在不增加堆芯杂质含量的情况下，实现了单零（SN）和双零（DN）配置下几乎完全分离的转向器等离子体状态。特别是，从新的红外相机和Langmuir探针在导流器目标处观察到，峰值热通量降低了约6倍，显著降低了DN的内在进出导流器不对称性。在氩注入的h模中也获得了令人鼓舞的结果，表明边缘局域模式（elm）的频率显著增加，幅度显著降低，从而减少了由elm引起的粒子和热负荷。这将在下一个实验活动中进一步探索，增加长脉冲操作的加热功率。
Introducing strong radiative impurities into divertor plasmas has been considered as an important way to mitigate the peak heat load at the divertor target plate for ITER, and will be employed in EAST for high power long pulse operations. To this end, radiative divertor experiments were explored under both low (L) and high (H) - mode confinement regimes, for the first time in EAST, with the injection of argon and its mixture (25% Ar in D2). The Ar injection greatly reduced particle and heat fluxes to the divertor in L-mode discharges, achieving nearly complete detached divertor plasma regimes for both single null (SN) and double null (DN) configurations, without increasing the core impurity content. In particular, the peak heat flux was reduced by a factor of ~6, significantly reducing the intrinsic in-out divertor asymmetry for DN, as seen by both the new infra-red camera and the Langmuir probes at the divertor target. Promising results have also been obtained in the H-modes with argon seeding, demonstrating a significant increase in the frequency and decrease in the amplitude of the edge localized modes (ELMs), thus reducing both particle and heat loads caused by the ELMs. This will be further explored in the next experimental campaign with increasing heating power for long pulse operations.