Space-resolved extreme ultraviolet spectrometer system for impurity behavior research on experimental advanced superconducting Tokamak

Shen, Yuquan; Du, Xuewei; Zhang, W.; Wang, Q.; Li, Y.; Fu, Jia; Wang, F.; Xu, Jialin; Lu, Baozhu; Shi, Yuejiang; Wan, Baonian

doi:10.1016/j.nima.2012.10.070

Cited by 24 publications

(12 citation statements)

References 21 publications

(22 reference statements)

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“…Orienting the VLS grating at an incident angle of 87°p roduces near flat-field spectral images in the wavelength range 3-50 nm recorded by the CCD with a spectral resolution of 0.006 nm. An absolute intensity calibration was carried out at the National Synchrotron Radiation Laboratory of the University of Science and Technology of China, and a detailed description of the spectrometer can be found in Shen et al (2013).…”

Section: Experimental Data Acquisitionmentioning

confidence: 99%

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Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST

et al. 2021

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Spatial profiles of impurity emission measurements in the extreme ultraviolet (EUV) spectroscopic range in radiofrequency (RF)-heated discharges are combined with one-dimensional and three-dimensional transport simulations to study the effects of resonant magnetic perturbations (RMPs) on core impurity accumulation at EAST. The amount of impurity line emission mitigation by RMPs appears to be correlated with the ion Z for lithium, carbon, iron and tungsten monitored, i.e. stronger suppression of accumulation for heavier ions. The targeted effect on the most detrimental high-Z impurities suggests a possible advantage using RMPs for impurity control. Profiles of transport coefficients are calculated with the STRAHL one-dimensional impurity transport code, keeping $\nu /D$ fixed and using the measured spatial profiles of $\textrm{F}{\textrm{e}^{20 + }}$ , $\textrm{F}{\textrm{e}^{21 + }}$ and $\textrm{F}{\textrm{e}^{22 + }}$ to disentangle the transport coefficients. The iron diffusion coefficient ${D_{\textrm{Fe}}}$ increases from $1.0- 2.0\;{\textrm{m}^2}\;{\textrm{s}^{ - 1}}$ to $1.5- 3.0\;{\textrm{m}^2}\;{\textrm{s}^{ - 1}}$ from the core region to the edge region $(\rho \gt 0.5)$ after the onset of RMPs. Meanwhile, an inward pinch of iron convective velocity ${\nu _{\textrm{Fe}}}$ decreases in magnitude in the inner core region and increases significantly in the outer confined region, simultaneously contributing to preserving centrally peaked $\textrm{Fe}$ profiles and exhausting the impurities. The ${D_{\textrm{Fe}}}$ and ${\nu _{\textrm{Fe}}}$ variations lead to reduced impurity contents in the plasma. The three-dimensional edge impurity transport code EMC3-EIRENE was also applied for a case of RMP-mitigated high-Z accumulation at EAST and compared to that of low-Z carbon. The exhaust of ${\textrm{C}^{6 + }}$ toward the scrape-off layer accompanying an overall suppression of heavier ${\textrm{W}^{30 + }}$ is observed when using RMPs.

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Section: Experimental Data Acquisitionmentioning

confidence: 99%

“…An absolute intensity calibration was carried out at the National Synchrotron Radiation Laboratory of the University of Science and Technology of China, and a detailed description of the spectrometer can be found in Shen et al. (2013).…”

Section: Experimental Data Acquisitionmentioning

confidence: 99%

Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST

et al. 2021

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“…Figure 1(c) displays a schematic of the EUV spectrometer system on EAST, which is installed at the outboard midplane port. The EUV spectrometer system on EAST is commonly used in the diagnostics of the edge impurity behaviour by observing the distribution of spectral intensity and the shape of impurity lines (Shen et al 2013;Vogel et al 2018). The EUV spectrometer mainly consists of an entrance slit, a varied line spacing groove grating and a charge coupled device.…”

Section: Experiments On Eastmentioning

confidence: 99%

“…On EAST tokamak, the edge impurity transport and emission can be investigated based on a new development of an EUV spectrometer system (Shen et al 2013;Vogel et al 2018), which can provide the distributions of impurity emission in the edge region for the perturbed and equilibrium cases. In this study, the transport characteristics of the edge carbon impurity in the scrape-off layer (SOL) of EAST tokamak with and without RMP applications have been studied with the 3-D edge transport code EMC3-EIRENE (Feng et al 2004;Reiter et al 2005).…”

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confidence: 99%

Impacts of resonant magnetic perturbations on edge carbon transport and emission on EAST with EMC3-EIRENE modelling

et al. 2020

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The modelling of edge carbon transport and emission on EAST tokamak under resonant magnetic perturbation (RMP) fields has been conducted with the three-dimensional edge transport code EMC3-EIRENE. The measured vertical distribution of CVI emission by the extreme ultraviolet spectrometer system for the perturbed case shows a reduction in the CVI emission by 20 % compared to the equilibrium case. The chord-integrated CVI emission can be reconstructed by EMC3-EIRENE modelling, which presents an increase in the CVI emission with RMP fields. The discrepancy between experiments and simulations has been investigated by parameter study to examine the sensitivity of the simulation results on the edge plasma conditions and the impurity perpendicular transport. It is found that the variation of edge plasma conditions for the equilibrium case cannot resolve the discrepancy in the CVI emission between simulations and measurements. The simulations with enhanced impurity perpendicular transport coefficient allows a reasonable agreement with the measured reduction of CVI emission.

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“…[13] An extreme ultraviolet spectrometer mainly consists of three parts: an entrance slit, a varied-lines-space (VLS) spherically concaved holographic groove grating and a backilluminated full frame CCD. [16,17] The XEUV system is installed at port C, attached to the end of the pumping duct, as shown in Fig. 1.…”

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confidence: 99%

Observation of Molybdenum Emission from Impurity-Induced Long-Lived m = 1 Mode on the Experimental Advanced Superconducting Tokamak

Shen

Lyu

Wang

et al. 2016

Chinese Phys. Lett.

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We observe the spectra of molybdenum for the first time since the first wall of our experimental advanced superconducting tokamak (EAST) was changed mainly to molybdenum tiles. A large amount of molybdenum accumulated in the central plasma where the long-lived m = 1 mode instability bursts is shown. Molybdenum is proved to be the main impurity species observed during the formation and lifetime of impurity-induced long-lived m = 1 mode. This may indicate that a close relationship exists between the high-Z impurity accumulation and the occurrence of long-lived m = 1 mode in EAST plasmas.

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Space-resolved extreme ultraviolet spectrometer system for impurity behavior research on experimental advanced superconducting Tokamak

Cited by 24 publications

References 21 publications

Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST

Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST

Impacts of resonant magnetic perturbations on edge carbon transport and emission on EAST with EMC3-EIRENE modelling

Observation of Molybdenum Emission from Impurity-Induced Long-Lived m = 1 Mode on the Experimental Advanced Superconducting Tokamak

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