Integrated infrared and visible tangential wide-angle viewing systems for surface temperature measurement and discharge monitoring in EAST

Chen, M.W.; Yang, Xiaofei; Gong, Xianzu; Gan, Kaifu; Zhang, B.; Yang, Zhendong

doi:10.1016/j.fusengdes.2019.111415

Cited by 17 publications

(9 citation statements)

References 12 publications

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“…Two tangential infrared camera with high time and spatial resolution were installed on horizontal ports to measure the surface temperature and monitor the overheating on PFCs. The field of view of two infrared cameras is 49.5 • × 62 • and their time resolution ranges from 115 Hz to 120 kHz, depending on the observed pixel range [39,40].…”

Section: Methodsmentioning

confidence: 99%

Power balance investigation in long-pulse high-performance discharges with ITER-like tungsten divertor on EAST

et al. 2020

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The Experimental Advanced Superconducting Tokamak (EAST) research program concentrates on demonstrating steady-state high-performance H-mode operations with ITER-like tungsten divertor. Calorimetry was applied to actively water-cool the plasma facing components (PFCs) by increasing the water temperature for power balance investigation. Considering the energy balance of EAST long-pulse high-performance discharges with upper single null (USN) configuration, thus far, approximately 78% of the injected energy could be accounted for. The method of estimation of heat flux on upper tungsten divertor target with a high time-and spatial-resolved infrared camera has been developed, and the sum of its heat load was found to be significantly consistent with that measured through calorimetry. The record longest steady-state H-mode plasma #73 999 was sustained for up to 101.2 s with net injected energy exceeding ~0.25 GJ in the USN configuration. Heat load analysis of this discharge using calorimetric measurement indicates that the modification of heat load distribution was observed and this was induced by a slight change in the magnetic configuration. Not all temperature increments in the five cooling water modules reached the saturated state for the 100 s level discharge, which means that 100 s timescales are insufficient as compared to the thermal transport timescale in the targeted PFCs. The heat load on the tungsten divertor targets is not evenly distributed with the ratio of ~2 in favour of the outer divertor.The experimental results and analysis of the physics involved in these USN configuration discharges are reported and discussed.

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Section: Methodsmentioning

confidence: 99%

Power balance investigation in long-pulse high-performance discharges with ITER-like tungsten divertor on EAST

et al. 2020

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“…14, a wide-angle camera (FoV = 62°×59.5°) is fixed on K-port and its angle was changed in 2019, allowing good resolution infrared measurements on the I-port antenna limiter (Fig. A5) with 640 × 512 pixels full frame at 115Hz with pixel size on antenna limiter ~ 3-4mm [48]. During discharge 83746 made in 2019, the power was far from balanced on the straps with power changing between 50kW up to 350kW from one strap to its neighbour.…”

Section: A3) Comparison Of Surface Temperature Estimations From Infrared and Temperature Inversion With Teddy Code On East I-port Graphitmentioning

confidence: 99%

Metallic impurity content behavior during ICRH-heated L-mode discharges in EAST

Urbanczyk¹,

Zhang²,

Zhang³

et al. 2020

Nucl. Fusion

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de

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“…Currently, there are three IR thermography diagnostic systems in EAST, with one HRVS developed to supervise the tungsten divertor target in 2014, and two newly developed WAVS implemented in EAST in 2017 to monitor the vacuum vessel and measure the surface temperature of the PFC [14]. As shown in figure 1(a), the HRVS with ∼2 mm spatial resolution per pixel could cover two complete upper outer (UO) divertor cassettes with part of the dome and upper inner (UI) divertor regions of port L in EAST.…”

Section: Upgrade Of the Ir Thermography Diagnosticmentioning

confidence: 99%

Detachment plasma achieved based on active temperature feedback system in EAST

et al. 2020

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The infrared (IR) thermography diagnostic has recently been upgraded to achieve real-time temperature measurement and feedback capability in the experimental advanced superconducting tokamak (EAST). A new control and data acquisition program for IR camera is developed with online temperature calibration and compensation. Reflective memory (RFM) is configured in the data acquisition system for real-time data transmission to the plasma control system (PCS). Based on the upgraded IR thermography diagnostic, detachment plasma has been achieved for the first time in EAST with active temperature feedback. The divertor impurity seeding system is used to inject a sequence of short neon impurity pulses with 50% D 2 to increase the edge radiation of the plasma particles. The temperature of the divertor target plates decreases to the preset target value and the divertor detachment has been realized with no serious reduction of plasma stored energy and confinement observed in the temperature feedback control phase. As a new feedback control method, the IR temperature feedback control shows great application prospects for the temperature and heat flux control of the first wall components in future long pulse operation of EAST.

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Integrated infrared and visible tangential wide-angle viewing systems for surface temperature measurement and discharge monitoring in EAST

Cited by 17 publications

References 12 publications

Power balance investigation in long-pulse high-performance discharges with ITER-like tungsten divertor on EAST

Power balance investigation in long-pulse high-performance discharges with ITER-like tungsten divertor on EAST

Metallic impurity content behavior during ICRH-heated L-mode discharges in EAST

Detachment plasma achieved based on active temperature feedback system in EAST

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