• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plasma physics and controlled fusion >ELM resolved energy distribution studies in the JET MKII Gas-Box divertor using infra-red thermography
【24h】

ELM resolved energy distribution studies in the JET MKII Gas-Box divertor using infra-red thermography

机译：ELM使用红外热像仪解决了JET MKII气箱转向器中的能量分布研究问题

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Using infra-red (IR) thermography, power loads onto the MKII Gas-Box divertor targets have been investigated in Type-I ELMy H-Mode plasmas at JET in medium current discharges (Ip = 2.6 MA and BT = 2.7 T). Heat fluxes are calculated from the measured divertor target tile surface temperatures taking into account the influence of co-deposited surface layers on tile surfaces. This is particularly important when estimating the energy deposition during transient events such as ELMs. Detailed energy balance analysis is used, both from IR and tile embedded thermocouples, to demonstrate an approximately constant ELM-averaged in/out divertor target asymmetry of ≈0.55 and to show that the ELM in/out energy deposition ratio ranges from 1 : 1 to 2 : 1. The inter-ELM in/out ratio is close to the ELM-averaged value at low pedestal collisionalities and decreases down to values close to zero when the inner target plasma detaches at the highest pedestal collisionalities. The fraction of ELM transported energy is observed to behave differently for the inner and the outer divertor. At higher pedestal collisionalities nearly the full inner target load is due to the ELMs whereas for the outer target the ELM transported energy never exceeds values of ≈ 0.3 of the total energy deposited there. The fraction of ELM energy arriving at the divertor compared with the pedestal loss energy in JET is found to be in the range of 0.75 for small ELMs down to 0.4 for large ELMs systematically decreasing with normalized ELM size. Since ITER is bound to use small ELMs the corresponding ELM wall load is expected to be small. The latter experimental result is in fair agreement with the observation that larger ELMs tend to travel faster across the SOL than smaller ELMs. However, a comparison of the presented data with models of ELM perpendicular transport is not conclusive due to the large experimental errorbars and uncertainties in the model assumptions.
机译：使用红外（IR）热成像技术，已在中等电流放电（Ip = 2.6 MA和BT = 2.7 T）的JET的I型ELMy H型等离子体中研究了MKII气箱分流器目标的功率负载。考虑到共沉积表面层对瓷砖表面的影响，可根据测得的偏滤器目标瓷砖表面温度计算出热通量。在估算瞬态事件（例如ELM）期间的能量沉积时，这一点尤其重要。红外和瓦斯嵌入式热电偶均使用了详细的能量平衡分析，以证明ELM平均进/出分流器目标不对称常数约为0.55，并表明ELM进/出能量沉积比范围为1：1至2：1。在低基座碰撞时，ELM间输入/输出比接近ELM平均值，当内部目标等离子体在最高基座碰撞时分离时，ELM输入/输出比率降低到接近零的值。观察到ELM传输的能量对于内部和外部分流器的行为不同。在较高的基座碰撞情况下，几乎全部的内部目标负载是由ELM引起的，而对于外部目标，ELM传输的能量绝不会超过在那里沉积的总能量的≈0.3。与JET中的基座损失能量相比，到达偏滤器的ELM能量的比例在小型ELM的范围内为0.75，而在大型ELM的范围内则随着归一化ELM尺寸而逐渐减小，为0.4。由于ITER必然会使用小型ELM，因此预期相应的ELM壁负载会很小。后者的实验结果与观察结果相吻合，即较大的ELM比较小的ELM在SOL上的移动速度更快。但是，由于实验误差较大且模型假设存在不确定性，因此无法将给出的数据与ELM垂直传输模型进行比较。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号