Experimental research on the deeply detached X-point radiator regime on EAST
Radiative divertor detachment with impurity seeding is considered one of the most promising means for mitigating particle and heat fluxes on the divertor target. To measure the impurity radiation distribution, a tangentially viewing camera system for lower divertor plasma observation has been develo...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | Nuclear Fusion |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1741-4326/ade4da |
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| Summary: | Radiative divertor detachment with impurity seeding is considered one of the most promising means for mitigating particle and heat fluxes on the divertor target. To measure the impurity radiation distribution, a tangentially viewing camera system for lower divertor plasma observation has been developed and installed on EAST. A reconstructed 2D distribution of N II line radiation is obtained based on Phillips–Tikhonov regularization, revealing the electron temperature region in the range of 6–10 eV during a nitrogen (N _2 ) seeding experiment. With N _2 seeding, the deep detachment with the stable X-point radiator (XPR) has been achieved on EAST with a tungsten divertor and metal first wall components. The profiles of T _et and q _t with a distance to the strike point larger than 6 cm ( ρ ∼ 1.06) are radially flat on the outer divertor target in the deeply detached state. The XPR contributes to the effective divertor protection with mitigation of heat/particle fluxes and suppression of divertor target sputtering. |
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| ISSN: | 0029-5515 |