Development of a new dynamic foveated imager on wide-angle infra-red thermography system to improve local spatial resolution in EAST

Zhang, J Y; Zhang, B; Gong, Xianzu; Chang, Jun; Jia, M.; Liu, C; Liang, Rongqing; Chen, W L; Wu, Chan-Shuo; Feng, Shunshan

doi:10.1063/5.0013212

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…The ion flux j sat profile is measured by divertor probes [31]. The newly upgraded wide-angle infra-red camera system [32] allows the measurement of the toroidal asymmetric heat flux pattern, created by the RMP field, at the upper outer divertor target.…”

Section: Introductionmentioning

confidence: 99%

Integrated ELM and divertor power flux control using RMPs with low input torque in EAST in support of the ITER research plan

Jia¹,

Loarte²,

Sun³

et al. 2021

Nucl. Fusion

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Section: Introductionmentioning

confidence: 99%

Integrated ELM and divertor power flux control using RMPs with low input torque in EAST in support of the ITER research plan

Jia¹,

Loarte²,

Sun³

et al. 2021

Nucl. Fusion

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“…The frame rate of the visible-light camera was in the range of 20-120 Hz, and the spatial resolution was less than 10 mm. The IR camera can provide information regarding the surface temperatures of the viewed PFCs [26]. The spatial resolution in the divertor region was ∼4 mm in large FoV cases, and the frame rate was 115 Hz in the full-frame mode but could be increased up to several kHz by reducing the FoV.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Hot spots induced by RF-accelerated electrons in the scrape-off layer on Experimental Advanced Superconducting Tokamak

et al. 2023

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Preventing impurity emission from hot spots on plasma-facing materials is a critical issue in the maintenance of high-performance plasma on the Experimental Advanced Superconducting Tokamak (EAST). In this study, experimental and theoretical analyses were performed to investigate the mechanism of hot spot formation. In the upper single null magnetic configuration of the EAST, two separatrices were connected to the upper (primary) and lower (secondary) X-points. Experiments on plasma configuration control indicated that the reduction in the gap between the lower (secondary) separatrix and lower hybrid antenna is effective in preventing hot spot formation on the lower divertor, which frequently emits impurities in long-duration discharges. This effectiveness was quantitatively confirmed by magnetic field lines tracking simulation and calorimetric measurement of divertors in the experiment. Two-frequency power modulation of the lower hybrid wave (LHW) was conducted to evaluate power deposition on the scrape-off layer (SOL) during propagation from the LHW antenna to the main plasma. This experiment clarified that LHW-accelerated electrons in the SOL via collision damping deliver their energies to hot spots along the magnetic field line. These findings help alleviate or even eliminate the formation of hot spots and maintain the performance of plasma.

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“…The working bandwidth of the IR camera is 3-4.9 μm with a temperature measurement range of room temperature (RT) to 2500 °C. Recently, the IR diagnostic system has been upgraded by developing a dynamic foveated imager system which improves the local spatial resolution from 4 mm pixel −1 to 2 mm pixel −1 on divertor targets [39]. In this study, the IR camera was set in a small window of 184×160 pixels ).…”

Section: Experiments Setupmentioning

confidence: 99%

Study on divertor heat flux under n = 3 and n = 4 resonant magnetic perturbations using infrared thermography diagnostic in EAST

Liang¹,

Gong²,

Zhang³

et al. 2022

Plasma Sci. Technol.

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Resonant magnetic perturbations (RMPs) with high toroidal mode number n are considered for controlling edge-localized modes (ELMs) and divertor heat flux in future ITER H-mode operations. In this paper, characteristics of divertor heat flux under high-n RMPs (n = 3 and 4) in H-mode plasma are investigated using newly upgraded infrared thermography diagnostic in EAST. Additional splitting strike point (SSP) accompanying with ELM suppression is observed under both RMPs with n = 3 and n = 4, the SSP in heat flux profile agrees qualitatively with the modeled magnetic footprint. Although RMPs suppress ELMs, they increase the stationary heat flux during ELM suppression. The dependence of heat flux on q95 during ELM suppression is preliminarily investigated, and further splitting in original strike point (OSP) is observed at q95=4 during ELM suppression. In terms of ELM pulses, the presence of RMPs shows little influence on transient heat flux distribution.

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Development of a new dynamic foveated imager on wide-angle infra-red thermography system to improve local spatial resolution in EAST

Cited by 7 publications

References 11 publications

Integrated ELM and divertor power flux control using RMPs with low input torque in EAST in support of the ITER research plan

Integrated ELM and divertor power flux control using RMPs with low input torque in EAST in support of the ITER research plan

Hot spots induced by RF-accelerated electrons in the scrape-off layer on Experimental Advanced Superconducting Tokamak

Study on divertor heat flux under n = 3 and n = 4 resonant magnetic perturbations using infrared thermography diagnostic in EAST

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