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arXiv 2206.08643physics.plasm-ph
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EAST 上在有利 Bt 位形下利用外侧偏滤器 Langmuir 探针进行的刮削层粒子通量宽度实验定标

Experimental scaling of the scrape-off layer particle flux width by outboard divertor Langmuir probes with favorable Bt configuration on EAST

X. Liu, L. Y. Meng, J. C. Xu, L. Wang, J. Li, the EAST Team

AI总结:

本文在 EAST 有利 Bt 上单零放电中校正上外偏滤器 Langmuir 探针数据,基于约 260 次放电建立 H/L/Ohmic 数据库,获得外侧 λ_js 对 W_MHD/n_e 和 P_tot 的定标律。

摘要:

刮削层(SOL)功率宽度(λ_q)对于预测未来磁约束装置中偏滤器靶板的热负荷非常重要。目前,λ_q 定标的底层物理机制尚未被完全理解。本文将此前的内侧 SOL 粒子通量宽度(λ_{js})定标 [Liu et al 2019 Plasma Phys. Control. Fusion 61 045001] 扩展到 EAST 的外侧,这能够为 λ_q 研究提供更多实验证据。研究发展了一种系统方法,利用更可靠的邻近测量结果来校正可靠性较低的上外(UO)偏滤器 Langmuir 探针(Div-LP)测量,以降低 λ_js 的测量不确定度。对于 2019 年实验 campaign 中具有有利 Bt 和上单零位形的放电,依据若干准则选取了约 260 次放电,以确保获得良好的 λ_js 测量。研究构建了 H-mode、L-mode 和 Ohmic 三个数据库,并将其用于 λ_js 定标。结果发现,H-mode 和 L-mode 等离子体的外侧 λ_js 定标为 λ_(js,UO)=1.52(W_{MHD}/n_e)^(-0.61) P_{tot}^0.19,其中 W_{MHD} 为储能,n_e 为线平均密度,P_{tot} 为总输入功率。除定标振幅外,该定标与内侧 λ_js 定标相似,而振幅差异可能源于三角形变。尽管回归质量相对较差,但 λ_js 对 W_{MHD}/n_e 可重复的定标依赖关系证实了该依赖关系的可靠性。本文还讨论了 λ_q/λ_{js} 仅对 Bp 的定标不足以涵盖 SOL 热输运的全部物理机制。

英文摘要:

The scrape-off layer (SOL) power width (λ_q) is important for predicting the heat load on divertor targets for future magnetically confined devices. Currently, the underlying physics for λ_q scaling is not fully understood. This paper extends the previous inboard SOL particle flux width (λ_{js}) scaling [Liu et al 2019 Plasma Phys. Control. Fusion 61 045001] to the outboard side in EAST, which can provide more experimental evidence for λ_q study. A systematic method has been developed to correct the less reliable upper outer (UO) divertor Langmuir probe (Div-LP) measurements with their more reliable neighboring measurements to reduce the measurement uncertainty of λ_js. For the discharges with the favorable Bt and upper single null configurations in the 2019 experiment campaign, about 260 discharges have been selected by certain criteria to ensure good λ_js measurements. Three H-mode, L-mode, and Ohmic databases have been constructed and are used for λ_js scalings. It is found that the outboard λ_js for the H-mode and L-mode plasmas scales as, λ_(js,UO)=1.52(W_{MHD}/n_e)^(-0.61) P_{tot}^0.19, where W_{MHD} is the stored energy, n_e is the line-averaged density, and P_{tot} is the total input power. This scaling is similar to the inboard λ_js scaling except for the scaling amplitude that is probably due the triangularity. The repeatable scaling dependence on W_{MHD}/n_e confirms the reliability of this dependence even though the regression quality is relatively poor. It is also discussed that the solely scaling of λ_q/λ_{js} on Bp is not enough to include all the physics of SOL heat transports.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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