Estimation of neutral beam injector power transferred to KSTAR plasmas

IF 2.6 3区 工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY
Jong-Gu Kwak, J.H. Jeong, S.C. Hong
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引用次数: 0

Abstract

KSTAR shows the long pulse capability based on superconducting magnet and NBI plays a crucial role in sustaining the plasma via plasma heating and current driving. So, the accurate NBI power measurement transferred to KSTAR plasma is important for the analysis of plasma transport as well as plasma performance parameters. In a long pulse operation, the water coolant temperature is at the steady state condition in longer pulse more than 20s and the coupled neutral beam power to KSTAR plasma during the tokamak experiments is rechecked by using water flow calorimetric method after the experiment. The effect of beam duct scraper loss which was not considered at the neutral beam power calibration process is less than 5 % in terms of neutral beam power. However, in long pulse operation of NBI in KSTAR experiments, high strength of stray PF affects the beam path, the neutral beam power registered on mds + using beam current method is over estimated and it is calculated up to a few percent in terms of neutral beam power using calorimetric method. Therefore, it is necessary to consider the beam power variation by PF effect to interpret the plasma performance degradation in long pulse operation. Lastly. when the ion source tun on or turn off in condition other ion sources are operated, the beam transmission power is also affected because of sharing the beam box for ion sources so that the careful power estimation is necessary for such kind of beam power modulation experiments in KSTAR.
估算传输到 KSTAR 等离子体的中性束注入器功率
KSTAR 显示了基于超导磁体的长脉冲能力,而 NBI 在通过等离子体加热和电流驱动维持等离子体方面发挥着至关重要的作用。因此,对 KSTAR 等离子体进行精确的 NBI 功率测量对于分析等离子体传输和等离子体性能参数非常重要。在长脉冲运行中,水冷却剂温度在超过 20 秒的长脉冲中处于稳定状态,在托卡马克实验过程中,我们在实验结束后使用水流量热法重新检查了传递到 KSTAR 等离子体的耦合中性束功率。中性束功率校准过程中未考虑的束管刮刀损耗对中性束功率的影响小于 5%。然而,在 KSTAR 实验中的 NBI 长脉冲运行中,高强度的杂散 PF 会影响光束路径,使用束流法在 mds + 上记录的中性束功率被高估,而使用量热法计算的中性束功率仅为百分之几。因此,有必要考虑 PF 效应带来的束流功率变化,以解释长脉冲运行时等离子体性能的下降。最后,当离子源在其他离子源运行的条件下开启或关闭时,由于离子源共用光束箱,光束传输功率也会受到影响,因此在 KSTAR 进行此类光束功率调制实验时,有必要进行仔细的功率估算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Nuclear Engineering and Technology
Nuclear Engineering and Technology 工程技术-核科学技术
CiteScore
4.80
自引率
7.40%
发文量
431
审稿时长
3.5 months
期刊介绍: Nuclear Engineering and Technology (NET), an international journal of the Korean Nuclear Society (KNS), publishes peer-reviewed papers on original research, ideas and developments in all areas of the field of nuclear science and technology. NET bimonthly publishes original articles, reviews, and technical notes. The journal is listed in the Science Citation Index Expanded (SCIE) of Thomson Reuters. NET covers all fields for peaceful utilization of nuclear energy and radiation as follows: 1) Reactor Physics 2) Thermal Hydraulics 3) Nuclear Safety 4) Nuclear I&C 5) Nuclear Physics, Fusion, and Laser Technology 6) Nuclear Fuel Cycle and Radioactive Waste Management 7) Nuclear Fuel and Reactor Materials 8) Radiation Application 9) Radiation Protection 10) Nuclear Structural Analysis and Plant Management & Maintenance 11) Nuclear Policy, Economics, and Human Resource Development
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