Skip to main content Accessibility help
×
Home
Hostname: page-component-768ffcd9cc-jpcp9 Total loading time: 0.385 Render date: 2022-12-01T21:39:26.620Z Has data issue: true Feature Flags: { "useRatesEcommerce": false } hasContentIssue true

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

Published online by Cambridge University Press:  29 March 2021

Germán Vogel
Affiliation:
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei230031, PR China School of Nuclear Science and Technology, University of Science and Technology of China, Hefei230026, PR China
Hongming Zhang
Affiliation:
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei230031, PR China
Yongcai Shen
Affiliation:
School of Physics and Materials Engineering, Hefei Normal University, Hefei230601, PR China
Shuyu Dai
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian116024, PR China
Youwen Sun
Affiliation:
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei230031, PR China
Juan Huang
Affiliation:
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei230031, PR China
Shuai Gu
Affiliation:
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei230031, PR China
Jia Fu
Affiliation:
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei230031, PR China
Ruiji Hu
Affiliation:
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei230031, PR China School of Nuclear Science and Technology, University of Science and Technology of China, Hefei230026, PR China
Jun Chen
Affiliation:
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei230031, PR China School of Nuclear Science and Technology, University of Science and Technology of China, Hefei230026, PR China
Xuewei Du
Affiliation:
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230029, PR China
Qiuping Wang
Affiliation:
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230029, PR China
Yi Yu
Affiliation:
School of Nuclear Science and Technology, University of Science and Technology of China, Hefei230026, PR China
Shifeng Mao
Affiliation:
School of Nuclear Science and Technology, University of Science and Technology of China, Hefei230026, PR China
Bo Lyu*
Affiliation:
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei230031, PR China
Minyou Ye*
Affiliation:
School of Nuclear Science and Technology, University of Science and Technology of China, Hefei230026, PR China
*
Email addresses for correspondence: blu@ipp.ac.cn, yemy@ustc.edu.cn
Email addresses for correspondence: blu@ipp.ac.cn, yemy@ustc.edu.cn

Abstract

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.

Type
Research Article
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Cui, Z. Y., Morita, S., Zhou, H. Y., Ding, X. T., Sun, P., Kobayashi, M., Cui, X. W., Xu, Y., Huang, X. L., Shi, Z. B., et al. 2013 Enhancement of edge impurity transport with ECRH in the HL-2A tokamak. Nucl. Fusion 53, 093001.CrossRefGoogle Scholar
Dai, S. Y., Kobayashi, M., Kawamura, G., Morita, S., Zhang, H., Oishi, T., Feng, Y., Wang, D. Z., Suzuki, Y. & LHD Experimental Group 2016 EMC3-EIRENE modelling of edge impurity transport in the stochastic layer of the large helical device compared with extreme ultraviolet emission measurements. Nucl. Fusion 56, 066005.CrossRefGoogle Scholar
Dai, S. Y., Zhang, H. M., Lyu, B., Wang, L., Feng, Y., Wang, Z. X. & Wang, D. Z. 2020 Impacts of resonant magnetic perturbations on edge carbon transport and emission on EAST with EMC3-EIRENE modelling. J. Plasma Phys. 86, 815860303.CrossRefGoogle Scholar
Dux, R. 2014 STRAHL user manual. Tech. Report IPP 10/30. http://hdl.handle.net/11858/00-001M-0000-0027-0DB8-4.Google Scholar
Evans, T. E., Moyer, R. A., Thomas, P. R., Watkins, J. G., Osborne, T. H., Boedo, J. A., Doyle, E. J., Fernstermacher, M. E., Finken, K. H., Groebner, R. J., et al. 2004 Suppression of large edge-localized modes in high-confinement DIII-D plasmas with a stochastic magnetic boundary. Phys. Rev. Lett. 92, 235003.CrossRefGoogle ScholarPubMed
Feng, Y., Sardei, F., Kisslinger, J. & Grigull, T. 1997 A 3D Monte Carlo code for plasma transport in island divertors. J. Nucl. Mater. 241–243, 930934.CrossRefGoogle Scholar
Fischer, R., Fuchs, C., Kurzan, B., McDermott, R. M., Putterich, T., Rathgeber, S. K., Suttrop, W., Viezzer, E., Willensdorfer, M., Wolfrum, E. et al. 2011 Effect of non-axisymmetric magnetic perturbations on profiles at ASDEX Upgrade. In 38th EPS Conference on Plasma Physics, Strasbourg, France, 27 June–1st July, P1.072.Google Scholar
Greiche, A., Liang, Y., Marchuk, O., Bertschinger, G., Biel, W., Burhenn, R., Dux, R., Koslowski, H. R., Kramer-Flecken, A., Lowenbruck, K. 2008 Transport of argon and iron during a resonant magnetic perturbation at TEXTOR-DED. Plasma Phys. Control. Fusion 51, 032001.CrossRefGoogle Scholar
Hirai, T., Escourbiac, F., Carpentier-Chouchana, S., Durocher, A., Fedosov, A., Ferrand, L., Jokinen, T., Komarov, V., Merola, M., Mitteau, R., et al. 2014 ITER full tungsten divertor qualification program and progress. Phys. Scr. T159, 014006.CrossRefGoogle Scholar
Lunt, T., Feng, Y., Bernert, M., Herrmann, A., de Marne, P., McDermott, R., Muller, H. W., Potzel, S., Putterich, T., Rathgeber, S. et al. 2012 First EMC3-EIRENE simulations of the impact of the edge magnetic perturbations at ASDEX Upgrade compared with the experiment. Nucl. Fusion 52, 054013.CrossRefGoogle Scholar
Lyu, B., Wang, F. D., Pan, X. Y., Chen, J., Fu, Y., Li, Y. Y., Bitter, M., Hill, K. W., Delgado-Aparicio, L. F., Pablant, N. et al. 2014 Upgrades of imaging X-ray crystal spectrometers for high-resolution and high-temperature plasma diagnostics on EAST. Rev. Sci. Instrum. 85, 11E406.CrossRefGoogle ScholarPubMed
Lyu, B., Chen, J., Hu, R. J., Wang, F. D., Li, Y. Y., Fu, J., Shen, Y. C., Bitter, M., Hill, K. W., Delgado-Aparicio, L. F. et al. 2016 Measurement of helium-like and hydrogen-like argon spectra using double-crystal X-ray spectrometers on EAST. Rev. Sci. Instrum. 87, 11E326.CrossRefGoogle ScholarPubMed
Merola, M., Escourbiac, F., Raffray, R., Chappuis, P., Hirai, T. & Martin, A. 2014 Overview and status of ITER internal components. Fusion Engng Des. 89 (7–8), 890895.CrossRefGoogle Scholar
Morita, S., Dong, C. F., Kobayashi, M., Goto, M., Huang, X. L., Murakami, I., Oishi, T., Wang, E. H., Ashikawa, N., Fujii, K. et al. 2013 Effective screening of iron impurities in the ergodic layer of the large helical device with a metallic first wall. Nucl. Fusion 53, 093017.CrossRefGoogle Scholar
Reiter, D. 1992 Progress in two-dimensional plasma edge modelling. J. Nucl. Mater. 196–198, 8089.CrossRefGoogle Scholar
Schmitz, O., Ida, K., Kobayashi, M., Bader, A., Brezinsek, S., Evans, T. E., Funaba, H., Goto, M., Mitarai, O., Morisaki, T., et al. 2016 Enhancement of helium exhaust by resonant magnetic perturbation fields at LHD and TEXTOR. Nucl. Fusion 56, 106011.CrossRefGoogle Scholar
Shen, Y., Du, X., Zhang, W., Wang, Q., Li, Y., Fu, J., Wang, F., Xu, J., Lyu, B., Shi, Y., et al. 2013 Space-resolved extreme ultraviolet spectrometer system for impurity behavior research on experimental advanced superconducting tokamak. Nucl. Instrum. Meth. A 700, 8690.CrossRefGoogle Scholar
Shen, Y., Lyu, B., Zhang, H., Li, Y., Fu, J., Vogel, G., Wang, X., Xu, H., Wu, D., Zang, Q., et al. 2019 Suppression of molybdenum impurity accumulation in the core using on-axis electron cyclotron resonance heating in EAST. Phys. Plasmas 26, 032507.CrossRefGoogle Scholar
Summers, H. P., Dickson, W. J., O'Mullane, M. G., Badnell, N. R., Whhiteford, A. D., Brooks, D. H., Lang, J., Loch, S. D. & Griffin, D. C. 2006 Ionization state, excited populations and emission of impurities in dynamic finite density plasmas: I. The generalized collisional–radiative model for light elements. Plasma Phys. Control. Fusion 48, 263.CrossRefGoogle Scholar
Sun, Y., Liang, Y., Liu, Y. Q., Gu, S., Yang, X., Guo, W., Shi, T., Jia, M., Wang, L., Lyu, B., et al. 2016 Nonlinear transition from mitigation to suppression of the edge localized mode with resonant magnetic perturbations in the EAST tokamak. Phys. Rev. Lett. 117, 115001.CrossRefGoogle ScholarPubMed
Sun, Y., Liang, Y., Qian, J., Shen, B. & Wan, B. 2015 Modeling of non-axisymmetric magnetic perturbations in tokamaks. Plasma Phys. Control. Fusion 57, 045003.CrossRefGoogle Scholar
Vogel, G., Zhang, H., Shen, Y., Sun, Y. W., Zang, Q., Gu, N., Fu, J., Chen, J., Hu, R., Liu, H., et al. 2018 Extreme ultraviolet spectroscopy applied to study RMP effects on core impurity concentration in EAST. IEEE Trans. Plasma Sci. 46 (5), 13501355.CrossRefGoogle Scholar
Wan, B., Liang, Y., Gong, X., Li, J.G., Xiang, N., Xu, G.S., Sun, Y. W., Wang, L., Qian, J., Liu, H., et al. 2017 Overview of EAST experiments on the development of high-performance steady-state scenario. Nucl. Fusion 57, 102019.CrossRefGoogle Scholar
Zang, Q., Zhao, J., Yang, L., Hu, Q., Jia, Y., Zhang, T., Xi, X., Bhatti, S. H. & Gao, X. 2010 Development of a Thomson scattering diagnostic system on EAST. Plasma Sci. Technol. 12, 144.Google Scholar
Zhang, H., Morita, S., Dai, S., Oishi, T., Goto, M., Huang, X., Kawamura, G., Kobayashi, M., Liu, Y., Murakami, I., et al. 2017 Vertical profiles and two-dimensional distributions of carbon line emissions from C2+−C5+ ions in attached and RMP-assisted detached plasmas of large helical device. Phys. Plasmas 24, 022510.CrossRefGoogle Scholar
4
Cited by

Save article to Kindle

To save this article to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

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

Save article to Dropbox

To save this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Dropbox account. Find out more about saving content to Dropbox.

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

Save article to Google Drive

To save this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Google Drive account. Find out more about saving content to Google Drive.

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

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *