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

Abstract

Experiments have been carried out at the EAST tokamak to study ITER-relevant scenario integration issues, related to edge localized mode (ELM) control in H-mode plasmas by the application of three-dimensional (3D) resonant magnetic perturbations (RMPs), which have a large impact on the execution of the ITER research plan. The EAST experiments have successfully demonstrated ELM suppression at normalized torque inputs similar to ITER. The application of RMP fields with high toroidal mode number (n = 4) reduces the impact of ELM control on energy and particle confinement compared to those use lower n (n = 1, 2) RMPs. Injection of successive pellets is found to be effective in increasing the plasma density in ELM-suppressed H-modes and reducing the divertor power without triggering large ELMs at EAST. Access to high recycling and radiative divertor conditions while maintaining ELM suppression has been demonstrated in EAST by the use of gas fuelling and neon impurity seeding. Both approaches have been found to be effective in reducing power fluxes to the divertor strike points in near-separatrix lobes for both n = 2 and n = 4 RMPs. Furthermore, reduction of power fluxes in off-separatrix lobes is only effective for n = 4 RMP application,more » which is consistent with magnetic topology modelling (including plasma response) results showing a shallow penetration into the confined plasma region of field lines connected to these lobes compared to n = 2. The EAST results support the use of high n 3D fields for ELM suppression in ITER high Q_DT scenarios since they provide optimum integration features regarding energy and particle confinement, pellet fuelling, radiative divertor operation while eliminating ELM transient power loads and being compatible with low torque input.« less

Authors:

Jia, Manni  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-1672-9782"

Loarte, Alberto  ^[2];

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• Search DOE PAGES for ORCID "0000-0001-9592-1117"

Sun, Youwen  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-9934-1328"

Ma, Qun ^[3]; Wu, Xuemin ^[3]; Xie, Pengcheng  ^[3];

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Gu, Shuai  ^[4];

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• Search DOE PAGES for ORCID "0000-0001-5159-939X"

Hou, Jilei  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-7109-5700"

He, Kaiyang ^[1]; Li, Guoqiang ^[1]; Li, Kedong  ^[3];

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Li, Yingying  ^[5];

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Liang, Yunfeng ^[6]; Paz-Soldan, Carlos  ^[7];

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• Search DOE PAGES for ORCID "0000-0001-5069-4934"

Shi, Tonghui ^[1]; Shen, Biao ^[1]; Wan, Baonian ^[1]; Wang, Huihui  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-3034-0925"

Wang, Liang  ^[1];

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Wang, Yumin ^[1] more »; Xu, Jichan  ^[1];

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Xu, Shuai  ^[8];

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• Search DOE PAGES for ORCID "0000-0002-0033-3468"

Yang, Zhendong ^[9]; Zang, Qing ^[1]; Zhang, Bin  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-0304-2372"

Zhang, Jie ^[1]; Zhang, Ling ^[1]; Zuo, Guizhong ^[1] « less

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+ Show Author Affiliations

1. Chinese Academy of Sciences, Hefei (China)
2. ITER Organization, St Paul Lez Durance (France)
3. Chinese Academy of Sciences, Hefei (China); Graduate School of USTC, Hefei (China)
4. Oak Ridge Associated Universities (ORAU), Oak Ridge, TN (United States)
5. Enn Science and Technology Development Co., Ltd, Langfang (China); Hebei Key Laboratory of Compact Fusion, Langfang (China)
6. Chinese Academy of Sciences, Hefei (China); Forschungszentrum Jülich GmbH (Germany)
7. Columbia University, New York, NY (United States)
8. Forschungszentrum Jülich GmbH (Germany)
9. Tongling University (China)

Publication Date:

Wed Sep 15 00:00:00 EDT 2021

Research Org.:

General Atomics, San Diego, CA (United States); Columbia Univ., New York, NY (United States)

Sponsoring Org.:

USDOE Office of Science (SC); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)

OSTI Identifier:

1979387

Grant/Contract Number:  

SC0020298; SC0021968; 2017YFE0301100; 12005261; 11875292

Resource Type:

Accepted Manuscript

Journal Name:

Nuclear Fusion

Additional Journal Information:

Journal Volume: 61; Journal Issue: 10; Journal ID: ISSN 0029-5515

Publisher:

IOP Science

Country of Publication:

United States

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics; low input torque; RMP fields; ELM suppression; divertor power load control; pellet fuelling