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Recent Results on Field Reversed Configurations from the Translation, Confinement and Sustainment Experiment

Plasma Science and Technology 2005年第1期7卷 2605-2609页

作者：郭后扬 Redmond Plasma Physics Laboratory University of Washington Seattle Washington 98195 USA

The field-reversed configuration (FRC) offers an attractive alternative approach to magnetically confined fusion because of its extremely high β, simple linear geometry, and natural divertor for helium ash removal. Multi-hundred eV and high density FRCs have been produced using the standard Field Reversed Theta Pinch (RFTP) method, with a confinement scaling that leads to fusion conditions. These FRCs are, however, limited to only tens of mWb fluxes and sub-msec lifetime. Recent progress has been made in building up the flux and sustaining the FRC current using Rotating Magnetic Fields (RMF) in the Translation, Sustainment, and Confinement (TCS) facility at the University of Washington. TCS has demonstrated formation and steady-state sustainment of standard, flux-confined, prolate FRCs. The RMF also provides stability for the n = 2 rotational mode, which is the dominant global instability observed experimentally. Simple calculations show that a strong radially inward force imposed by the RMF increases proportionally to any local outward deformation of the plasma cross section. Evidence of this has been experimentally demonstrated, and the effects of various RMF antenna geometries studied. High temperature FRCs could also be produced in TCS by translating high energy plasmoids formed in the normal theta pinch manner into the confinement chamber containing the RMF antennas. Extremely interesting results were obtained for this translation and capture process. The plasmoids can survive the violent dynamics of supersonic reflections off magnetic mirror structures, producing a stable high-β, near-FRC state with substantial flux conversion from toroidal to poloidal. This is a tribute not only to the robustness of FRCs, but also to the tendency of an FRC to assume a preferred state for a magnetized plasma. The magnetic helicity, as inferred by a simple interpretive model, is approximately preserved, possibly conforming to a high-β relaxation principle.

关键词： field reversed configuration macroinstabilities current drive

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Predictive Modeling of EAST Divertor Target Power Loading with Varying Chemical Sputtering Conditions

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Plasma Science and Technology 2006年第6期8卷 633-638页

作者：郭后扬朱思铮李建刚 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Redmond Plasma Physics LaboratoryUniversity of WashingtonSeattleWashington 98195USA Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

The Experimental Advanced Superconducting Tokamak （EAST） is being built in China to achieve high power and long pulse operation for studies of reactor-relevant issues under steady-state conditions. A major concern for EAST is the power handling capability of the divertor target plates, which is a critical issue for future high-powered steady-state tokamaks, such as ITER. Detailed modeling using B2/EIRENE code package and the most recent chemical sputtering data shows that the presence of strong chemical sputtering at the main chamber wall leads to strong carbon radiation in the periphery of the confined plasma, significantly reducing the heat fluxes to the target plates and facilitating plasma detachment at a lower density desired for lower hybrid current drive in EAST, with only a slight increase in Zeff at the edge. The target heat load can be further reduced by operating with a double-null divertor configuration, which also leads to a significant reduction in the edge Zeff. However, the code predicts that the double-null operation would result in a strong divertor asymmetry in target power loading, favoring the outside targets.

关键词： power exhaust divertors impurities plasma-material interactions

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东方超环托卡马克高约束模式边界等离子体输运数值模拟研究

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物理学报 2013年第24期62卷 229-238页

作者：杜海龙桑超峰王亮孙继忠刘少承汪惠乾张凌郭后扬王德真大连理工大学物理与光电工程学院大连116023 中国科学院等离子体物理研究所合肥230031

利用SOLPS5.0模拟研究东方超环托卡马克(EAST)高约束模式时的刮削层等离子体.在高约束模式放电实验参数(第36291炮)的限制下,通过调整上游区径向反常输运系数来实现高约束模式模拟,在上游电子密度和温度与实验符合的条件下能够很好地进... 详细信息

利用SOLPS5.0模拟研究东方超环托卡马克(EAST)高约束模式时的刮削层等离子体.在高约束模式放电实验参数(第36291炮)的限制下,通过调整上游区径向反常输运系数来实现高约束模式模拟,在上游电子密度和温度与实验符合的条件下能够很好地进行下游区模拟.在实现高约束模拟的基础上又分别研究了漂移项对偏滤器靶板能流不对称性的影响和上游能流衰减宽度对靶板能流密度峰值的影响.通过模拟发现,漂移是导致EAST放电内外靶板不对称性的主要原因,增大上游能流衰减宽度可以明显降低入射到靶板的峰值热流,并且偏滤器区辐射以及与中性粒子的相互作用减小了能流的衰减宽度对达到靶板能流的影响.

关键词：托卡马克高约束模式 SOLPS5 0 漂移

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EAST偏滤器钨铜单体水冷模块参数优化

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核聚变与等离子体物理 2013年第1期33卷 72-77页

作者：王健宋云涛郭后扬姚达毛罗广南许铁军中国科学技术大学核科学技术学院合肥230026 中国科学院等离子体物理研究所合肥230031

介绍了EAST超导托卡马克偏滤器的最新冷却模块结构。利用FLUENT有限元软件对不同参数下的模型进行了稳态热分析,定量研究了冷却模块换热能力随各参数的变化规律。针对EAST装置给出了初步优化的参数范围,为水冷钨铜偏滤器的设计制造提供... 详细信息

介绍了EAST超导托卡马克偏滤器的最新冷却模块结构。利用FLUENT有限元软件对不同参数下的模型进行了稳态热分析,定量研究了冷却模块换热能力随各参数的变化规律。针对EAST装置给出了初步优化的参数范围,为水冷钨铜偏滤器的设计制造提供了参考。这对于托卡马克装置及聚变堆偏滤器研究具有十分重要的意义。

关键词： EAST超导托卡马克偏滤器有限元分析热流密度

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极紫外波段Ar光谱分析在EAST偏滤器杂质屏蔽效应研究中的应用

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光谱学与光谱分析 2016年第7期36卷 2134-2138页

作者：张鹏飞张凌许棕段艳敏吴承瑞黄娟吴振伟郭后扬胡立群中国科学院等离子体物理研究所安徽合肥230031 中国科学技术大学研究生院科学岛分院安徽合肥230031 General Atomics P.O.Box 85608San DiegoCalifornia 92186USA

在托卡马克偏滤器区域充入杂质气体是检验偏滤器杂质屏蔽效应的重要手段。利用快速极紫外EUV光谱仪对EAST托克马克装置上开展的偏滤器Ar杂质注入实验进行观测。结合NIST原子光谱数据库对2～50 nm范围内不同电离态Ar的线光谱进行了谱线识... 详细信息

在托卡马克偏滤器区域充入杂质气体是检验偏滤器杂质屏蔽效应的重要手段。利用快速极紫外EUV光谱仪对EAST托克马克装置上开展的偏滤器Ar杂质注入实验进行观测。结合NIST原子光谱数据库对2～50 nm范围内不同电离态Ar的线光谱进行了谱线识别,识别出ArⅣ,ArⅨ-Ⅺ,Ar XⅣ-XⅥ等若干个电离态的谱线。为了同时观测等离子体不同区域的Ar杂质行为,在杂质注入实验时重点监测Ar XⅥ35.39 nm（Ar XⅥ电离能918.4 eV,主要分布在等离子体芯部）和ArⅣ44.22 nm（ArⅣ电离能9.6 eV,主要分布在等离子体边界）这两条谱线。利用该两条谱线强度随时间演化的结果初步分析了偏滤器杂质屏蔽效应。在同一充气口不同等离子体位形下的实验结果表明偏滤器对于从偏滤器区域注入Ar杂质的屏蔽效果优于从主等离子体区域注入,并且下偏滤器及内冷泵的综合粒子排除能力优于上偏滤器。

关键词： Ar极紫外光谱 EAST托克马克偏滤器杂质屏蔽

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Radiative Divertor Plasma Behavior in L- and H-Mode Discharges with Argon Injection in EAST

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Plasma Science and Technology 2013年第7期15卷 614-618页

作者：王东升郭后扬尚毅梓甘开福汪惠乾陈颖杰刘少承王亮高伟向玲燕吴振伟罗广南 the EAST team Department of Modern Physics University of Science and Technology of China Institute of Plasma Physics Chinese Academy of Sciences Tri Alpha Energy Inc.Rancho Santa Margarita CA 92688-7010 USA School of Engineering and Applied Science Harvard University

Introducing strong radiative impurities as an important way to mitigate the peak heat load will be employed in EAST for high power long pulse experiments were explored under both low （L） and the first time in EAST, with the injection of argon into divertor plasmas has been considered at the divertor target plate for ITER, and operations. To this end, radiative divertor high （H） - mode confinement regimes, for and its mixture （25% Ar in D2）. The Ar injection greatly reduced particle and heat fluxes to the divertor in L-mode discharges, achieving nearly complete detached divertor plasma regimes for both single null （SN） and double null （DN） configurations, without increasing the core impurity content. In particular, the peak heat flux was reduced by a factor of ~6~ significantly reducing the intrinsic in-out divertor asymmetry for DN, as seen by both the new infra-red camera and the Langmuir probes at the divertor target. Promising results have also been obtained in the H-modes with argon seeding, demonstrating a significant increase in the frequency and decrease in the amplitude of the edge localized modes （ELMs）, thus reducing both particle and heat loads caused by the ELMs. This will be further explored in the next experimental campaign with increasing heating power for long pulse operations.

关键词： radiative divertor impurity heat flux single null double null

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Preliminary study of divertor particle exhaust in the EAST superconducting tokamak

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Plasma Science and Technology 2017年第9期19卷 41-47页

作者：刘欢王亮徐国盛丁芳刘建斌许吉禅冯威邓国忠郑星炜余耀伟司杭刘海庆杨清泉孙震郭后扬 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China General Atomics PO Box 85608San DiegoCA 92186United States of America

The particle exhaust of the upper tungsten and lower carbon divertors in EAST has been preliminarily studied during the 2016 experimental campaign. The density decay time during terminating gas puffing has been employed as a key parameter to evaluate the divertor particle exhaust performance. Comparative plasma discharges have been carried out on the particle exhaust performance between two toroidal field directions in the upper single null and lower single null divertor configurations. This work has enhanced the understanding of the effects of the in–out asymmetry and divertor geometry on the efficiency of the divertor particle exhaust. In addition, the sensitivity of the particle exhaust capability on different strike point locations has been analyzed. The experimental results are expected to provide important information on the future upgrade of EAST bottom divertor and facilitate the realization of longer pulse operation.

关键词： EAST exhaust pumping tungsten strike campaign preliminarily facilitate decay directions

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OEDGE modeling of plasma contamination efficiency of Ar puffing from different divertor locations in EAST

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Plasma Science and Technology 2018年第4期20卷 121-126页

作者：张鹏飞张凌吴振伟许棕高伟王亮杨清泉许吉禅刘建斌屈浩刘永黄娟吴成瑞侯玉梅金钊 J D ELDER 郭后扬 Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People's Republic of China University of Science and Technology of China Hefei 230026 People's Repuiglic of China University of Toronto Institute for Aerospace Studies Toronto M3H5T6 Canada General Atomics PO Box 85608 San Diego CA 92186 United States of America

Modeling with OEDGE was carried out to assess the initial and long-term plasma contamination efficiency of Ar puffing from different divertor locations, i.e. the inner divertor, the outer divertor and the dome, in the EAST superconducting tokamak for typical ohmic plasma conditions. It was found that the initial Ar contamination efficiency is dependent on the local plasma conditions at the different gas puff locations. However, it quickly approaches a similar steady state value for Ar recycling efficiency >0.9. OEDGE modeling shows that the final equilibrium Ar contamination efficiency is significantly lower for the more closed lower divertor than that for the upper divertor.

关键词： divertor Ar puffing impurity transport OEDGE EAST

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Study of Scrape-Off-Layer Width in Ohmic and Lower Hybrid Wave Heated Double-Null Divertor Plasma in EAST

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Plasma Science and Technology 2011年第4期13卷 435-439页

作者：王亮徐国盛常加峰张炜颜宁丁斯晔刘少承明廷凤汪惠乾刘鹏蒋敏熊豪万宝年高翔郭后扬胡立群吴振伟朱思铮罗广南 Institute of Plasma Physics Chinese Academy of Sciences Tri Alpha Energy Rancho Santa Margarita

Edge profiles in Ohmic and lower hybrid （LH） wave heated discharges in EAST are presented. A comparison of the measured profiles is made with those from the theoretical prediction for the scrape-off-layer （SOL） width. The edge plasma parameters are diagnosed by a triple probe divertor diagnostic system and fast reciprocating probes at the outer mid-plane. The experimental results show that the SOL width of double-null （DN） divertor plasmas in EAST appears to exhibit a negative dependence on the power crossing the separatrix, which is consistent with the collisional SOL scalings of JET and Alcator C-Mod. This will provide useful information for extrapolation to the ITER SOL width scaling for power deposition.

关键词： SOL width DN divertor plasma EAST tokamak

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EAST偏滤器充气系统标定

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真空 2014年第3期51卷 1-4页

作者：黄剑锋吴振伟王玲郭后扬向玲燕王文章吴金华中科院等离子体物理研究所安徽合肥230031

EAST偏滤器充气系统是辐射偏滤器研究的重要方面。本文详细介绍了EAST新一轮改造升级后偏滤器充气系统最重要的两个特性——充气阀流量率和管道延迟时间的标定,结果显示系统性能得到较好优化,流量率线性稳定,延迟时间缩短约一半左右。

关键词： EAST 偏滤器充气系统流量率延迟时间

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