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H-mode discharges with lower hybrid current drive (LHCD) alone are achieved in EAST divertor plasma over a wide parameter range. These H-mode discharges are characterized by a sudden drop in Dα emission and a spontaneous rise in main plasma density. Good lower hybrid (LH) coupling during H-mode is obtained by putting the plasma close to the antenna and by injecting D2 gas from a pipe near the grill mouse. The analysis of lower hybrid current drive properties shows that the LH deposition profile shifts off axis during H-mode, and current drive (CD) efficiency decreases due to the increase in density. Modeling results of H-mode discharges with a general ray tracing code GENRAY are reported. 相似文献
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介绍了EAST低杂波高压电源保护系统的设计和实现。在EAST装置低杂波电源保护系统中,以主回路过电流﹑管体过电流﹑高压源主回路过电流﹑高压源主回路过电压为主要参数来保护系统正常工作的。在主回路过电流﹑管体过电流时通过撬棒来转移故障电流来保护速调管。 相似文献
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结合实验采集到的数据和观察到的实验现象,对HT-7装置低杂波系统陶瓷窗实验时,破裂的原因进行了分析,给出改进的措施。 相似文献
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介绍了EAST低杂波天线相位采集控制系统中两个主要部分的相位本底的校准技术。一是由相控多结波导阵天线与等离子体相切弧面引入的相位本底的静态校准,二是天线移动时软波导伸缩引起的可变相位本底的动态校准。低杂波天线相位本底校准技术为相位反馈控制系统提供了准确的相位基点,为实现预设相位与实调相位的一致性奠定了基础。 相似文献
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Experimental characteristics of a lower hybrid wave multi-junction coupler in the HT-7 tokamak 总被引:1,自引:0,他引:1 下载免费PDF全文
A phase-controlled lower hybrid wave (LHW) multi-junction (M J) coupler (3(rows)×4(columns)×4 (subwaveguides)) has been developed in the HT-7 tokamak. Simulations show that it is more effective for driving plasma current than an ordinary phase-controlled LHW antenna (3(rows)× 12(columns)) (traditional coupler). The plasm-wave coupling experiments show that the reflection coefficient (RC) is below 10%, implying that the MJ grill can launch the wave into the plasma effectively. The effect of power spectrum launched by the MJ coupler on RC indicates that an optimal condition is requisite for a better coupling in the lower hybrid current drive (LHCD) experiments, Studies indicate that the drive efficiency of the MJ antenna is higher than that of the traditional one, which is mainly ascribed to the discrepancy in impurity concentration, plasma temperature, and spectrum directivity. An improved confinement with an electron internal transport barrier is obtained by LHCD. The analysis shows that the modified negative (low) magnetic shear and the change of radial electric field profile due to LHCD are possible factors responsible for the eITB formation. 相似文献
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通过开展低杂波电流驱动效率与等离子体参数相关性研究,HT 7装置上的最大电流驱动效率达到ηCD=neRpIRF/PLH≈1.4×1019A·W-1·m-2。实验结果表明,优化低杂波的功率谱、等离子体密度、纵场等参数对提高驱动效率起到了关键作用。驱动效率对波谱、密度有较强的依赖性,波谱在Npeak‖=(2.45~2.9),密度为(1.5~2.0)×1013cm-3时驱动效率较高;驱动效率随着纵场的升高而增大;同时,改善托卡马克壁状态、降低杂质水平、提高放电稳定性,对提高驱动效率有积极作用。 相似文献
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����QNX�ķֲ�ʽ�ɼ�����ϵͳ 总被引:1,自引:0,他引:1
介绍了在QNX实时操作系统下分布式采集控制程序的编写。现场机器负责数据采集存储,并按照预设的参数进行控制。控制室机器负责参数设置与波形的显示,同时负责在控制室远程启动现场机器程序并返回运行的状态,以便在现场机器程序出现异常情况下采取相应的措施。经测试,系统的实时性和可靠性很好地满足了EAST装置LHCD系统单管测试的需要。 相似文献