تقرير
Experimental scaling of the scrape-off layer particle flux width by outboard divertor Langmuir probes with favorable Bt configuration on EAST
| العنوان: | Experimental scaling of the scrape-off layer particle flux width by outboard divertor Langmuir probes with favorable Bt configuration on EAST |
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| المؤلفون: | Liu, X., Meng, L. Y., Xu, J. C., Wang, L., Li, J., Team, the EAST |
| سنة النشر: | 2022 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Plasma Physics |
| الوصف: | The scrape-off layer (SOL) power width (\lambda_q) is important for predicting the heat load on divertor targets for future magnetically confined devices. Currently, the underlying physics for \lambda_q scaling is not fully understood. This paper extends the previous inboard SOL particle flux width (\lambda_{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 \lambda_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 \lambda_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 \lambda_js measurements. Three H-mode, L-mode, and Ohmic databases have been constructed and are used for \lambda_js scalings. It is found that the outboard \lambda_js for the H-mode and L-mode plasmas scales as, \lambda_(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 \lambda_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 \lambda_q/\lambda_{js} on Bp is not enough to include all the physics of SOL heat transports. Comment: 14 pages, 7 figures, 4 tables, Nucl. Fusion (2023) |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/1741-4326/ad1337 |
| URL الوصول: | http://arxiv.org/abs/2206.08643 |
| رقم الأكسشن: | edsarx.2206.08643 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/1741-4326/ad1337 |
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