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摘要:Material erosion and deposition on the plasma-facing materials(PFMs) are crcial in tokamak since they limit the lifetime of plasma facing components.In addition,fuel retention is one of the critical issues in ITER because of the safe management reduce the risk of potential accidents.One key problem is a lack of in situ and on line diagnostic tool to measure these issues.Laser-based techniques,such as laser-induced ablation/breakdown spectroscopy(LIAS/LIBS),are the most promising candidates for in situ plasma-wall interaction studies as well as tritium inventory measurements.In this work,we report on the LIBS and LIAS for assessing static and dynamic fuel retention as well as deposition on the first wall of EAST in the 2016 campaign.The in situ LIBS system on EAST has to be a routine diagnostic and provided the fuel retention,impurities and Li erosion and deposition distributionin real time betweendischarges and during wall conditioning processes.About 2.0 um Li deposition layer was found by real-time LIBS after 200 min Li evaporator wall conditioning on the first wall at the high field side nearmid-plane.About 1 um thickness of Li deposition layer was removed after 40 shots EAST discharges.A significant re-deposition of Li was found on a pre-clean region of the first wall during plasma discharge.Moreover,the H/(H+D) ratio was obtained under different conditions such as lithium,boron conditioning,water leakage and long pulse H-mode discharge by LIBS.These results indicated that LIBS could be a useful method for predicting of the wall condition of EAST tokamak.LIAS relies on localized ablation by an intense laser beam and subsequent excitation and ionization of the ablated species in the plasma edge region.It was studied at the high field side in the mid-plane region in coaxial observation geometry at H-port.A refined experimental setup and a timing scheme based on an FPGA were established in the meantime to monitor PWI during EAST discharges.The dynamic retention during the flat-top phase was investigated by recording the Balmer line emission of desorbed deuterium atoms.It is observed that the background-subtracted LIAS Balmer-a Signal is proportional to the time of plasma exposure for a given heating power.The experiment demonstrates the experimental capability to perform LIAS studies during EAST operation.These in situ experiment data are extremely valuable to improve the understanding and validate the models of the in vessel build-up of the tritium inventory in ITER and future D-T devices and for the application of LIBS and LIAS for ITER and future fusion devices.
会议名称:

The 2nd International Conference on Matter and Radiation at Extremes(ICMRE 2017)

会议时间:

2017-06-26

会议地点:

中国北京

  • 专辑:

    基础科学; 工程科技Ⅱ辑

  • 专题:

    物理学; 核科学技术

  • 分类号:

    O53;TL631.24

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