ST40托卡马克中宽热通量和窄热通量分布的朗缪尔探针与红外热成像测量
Langmuir probe and infrared thermography measurements of wide and narrow heat flux profiles in the ST40 tokamak
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中文总结 AI 辅助
研究ST40托卡马克中热通量分布，通过比较朗缪尔探针与红外热成像测量结果，发现近SOL热通量与电子电流有关，将电子电流贡献纳入热通量传输系数很关键，ST40升级后可对SOL功率衰减长度做更多研究。
中文摘要 AI 辅助
在ST40上观测到非常窄的热通量分布，在H模等离子体的近刮削层（SOL）中衰减长度$\lambda_{q,near}$<~1~mm。将偏滤器朗缪尔探针的测量结果与红外（IR）热成像系统对L模和无ELM的H模上单零偏滤等离子体的测量结果进行比较。通过朗缪尔探针测量到接地偏滤器靶的SOL电流，其分布呈现出与$\lambda_{q,near}$相似的指数衰减，这表明近SOL热通量与增强的电子电流到偏滤器有关。在捕获与红外热成像系统相似的窄分布时，将电子电流贡献纳入热通量传输系数至关重要。ST40正在进行的升级将使人们能够对双零和单零配置下内侧和外侧靶上的SOL功率衰减长度进行更多研究。
英文摘要
Very narrow heat flux profiles have been observed on ST40 with decay lengths in the near scrape-off-layer (SOL) of $λ_{q,near}<$~1~mm in H-mode plasmas. Measurements from divertor Langmuir probes are compared with an infrared (IR) thermography system for upper-single null diverted plasmas in L-mode and ELM-free H-mode. SOL current to the grounded divertor targets is measured from the Langmuir probes with profiles exhibiting a similar exponential decay to $λ_{q,near}$ suggesting the near SOL heat flux is related to enhanced electron current to the divertor. Inclusion of electron current contributions to the heat flux transmission coefficient is crucial in capturing similar narrow profiles to those from the IR thermography system. Ongoing upgrades to ST40 will enable more investigations on SOL power decay lengths on inboard and outboard targets in double and single null configurations.
