Plasma Physics and Controlled Fusion最新文献_第6页

Chasing the multi-modal plasma response in MAST-U 追寻 MAST-U 中的多模式等离子体响应

IF 2.2 2区物理与天体物理

Plasma Physics and Controlled Fusion Pub Date : 2024-05-08 DOI: 10.1088/1361-6587/ad4419

S Munaretto, Y Q Liu, D A Ryan, G Z Hao, J W Berkery, S Blackmore, L Kogan

{"title":"Chasing the multi-modal plasma response in MAST-U","authors":"S Munaretto, Y Q Liu, D A Ryan, G Z Hao, J W Berkery, S Blackmore, L Kogan","doi":"10.1088/1361-6587/ad4419","DOIUrl":"https://doi.org/10.1088/1361-6587/ad4419","url":null,"abstract":"Achieving edge localized modes (ELMs) suppression in spherical tokamaks by applying resonant magnetic perturbations (RMPs) has proven challenging. The poloidal spectrum of the applied RMP is a key parameter that has an impact on the capability to mitigate and eventually suppress ELMs. In this work the resistive magnetohydrodynamic code MARS-F (Liu <italic toggle=\"yes\">et al</italic> 2000 <italic toggle=\"yes\">Phys. Plasmas</italic>\u0000<bold>7</bold> 3681) is used to evaluate the possibility of directly measuring the plasma response in MAST-U, and particularly its variation as function of the applied poloidal spectrum, in order to guide the experimental validation of the predicted best RMP configuration for ELM suppression. Toroidal mode number <italic toggle=\"yes\">n</italic> = 2 RMP is considered to minimize the presence of sidebands, and to avoid the deleterious core coupling of <italic toggle=\"yes\">n</italic> = 1. Singular Value Decomposition is used to highlight linearly independent structures in the simulated magnetic 3D fields and how those structures can be measured at the wall where the magnetic sensors are located. Alternative ways to measure the multimodal plasma response and how they can be used to infer the best RMP configuration to achieve ELM suppression are also presented, including the plasma displacement and the 3D footprints at the divertor plates.","PeriodicalId":20239,"journal":{"name":"Plasma Physics and Controlled Fusion","volume":"5 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140932137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Suprathermal-ion-driven fusion chain reactions in the pure deuterium system 纯氘系统中的超热离子驱动聚变链式反应

IF 2.2 2区物理与天体物理

Plasma Physics and Controlled Fusion Pub Date : 2024-05-06 DOI: 10.1088/1361-6587/ad441a

A P L Robinson

引用次数: 0

Optimizing control for strike point sweeping using lower divertor coil in EAST 利用 EAST 中的下分流器线圈优化对打击点清扫的控制

IF 2.2 2区物理与天体物理

Plasma Physics and Controlled Fusion Pub Date : 2024-05-06 DOI: 10.1088/1361-6587/ad4417

Qinglai Qiu, Yang Zhang, Xiaodong Zhang, Qiping Yuan, Zhengping Luo, Zhaoliang Wang, Yibing Wu, Jing Qian, Bin Guo, Ruirong Liang, Yuehang Wang, Jianjun Chen, Yao Huang, Bingjia Xiao, Lingyi Meng and the East Team

{"title":"Optimizing control for strike point sweeping using lower divertor coil in EAST","authors":"Qinglai Qiu, Yang Zhang, Xiaodong Zhang, Qiping Yuan, Zhengping Luo, Zhaoliang Wang, Yibing Wu, Jing Qian, Bin Guo, Ruirong Liang, Yuehang Wang, Jianjun Chen, Yao Huang, Bingjia Xiao, Lingyi Meng and the East Team","doi":"10.1088/1361-6587/ad4417","DOIUrl":"https://doi.org/10.1088/1361-6587/ad4417","url":null,"abstract":"In 2021, EAST was equipped with a full-ring divertor coil to facilitate research on the fish tail divertor concept. Initially, it was observed that the coil current had a negligible ability to sweep the strike point. Conversely, when the amplitude and frequency of the alternating current were marginally increased, there was a significant interruption to plasma control. This perturbation was attributed to the poloidal control field’s limited response rate to the coil’s fluctuations. To address this issue, novel control methodologies were devised to ensure stable and effective sweeping of the strike point using the divertor coil. The devised methods are twofold: For high-frequency strike point control, a low-pass filter decoupling technique based on ISOFLUX control strategy enabled achieving a sweeping frequency of 100 Hz. This strategy allowed for consistent plasma management without compromising average stored energy or density regulation. Resulting from this proficient manipulation of the strike point, a reduction in the peak temperature of the divertor plate was observed. For low-frequency sweeping, a static multi-input multi-output decoupling approach was developed, facilitating concurrent sweeping of both the outer and inner strike points.","PeriodicalId":20239,"journal":{"name":"Plasma Physics and Controlled Fusion","volume":"161 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of vertical stability for negative triangularity pilot plants 负三角形试验设备的垂直稳定性评估

IF 2.2 2区物理与天体物理

Plasma Physics and Controlled Fusion Pub Date : 2024-05-06 DOI: 10.1088/1361-6587/ad4175

S Guizzo, A O Nelson, C Hansen, F Logak and C Paz-Soldan

{"title":"Assessment of vertical stability for negative triangularity pilot plants","authors":"S Guizzo, A O Nelson, C Hansen, F Logak and C Paz-Soldan","doi":"10.1088/1361-6587/ad4175","DOIUrl":"https://doi.org/10.1088/1361-6587/ad4175","url":null,"abstract":"Negative triangularity (NT) tokamak configurations may be more susceptible to magneto-hydrodynamic instability, posing challenges for recent reactor designs centered around their favorable properties, such as improved confinement and operation free of edge-localized modes. In this work, we assess the vertical stability of plasmas with NT shaping and develop potential reactor solutions. When coupled with a conformal wall, NT equilibria are confirmed to be less vertically stable than equivalent positive triangularity (PT) configurations. Unlike PT, their vertical stability is degraded at higher poloidal beta. Furthermore, improvements in vertical stability at low aspect ratio do not translate to the NT geometry. NT equilibria are stabilized in PT vacuum vessels due to the increased proximity of the plasma and the wall on the outboard side, but this scenario is found to be undesirable due to reduced vertical gaps which give less spatial margin for control recovery. Instead, we demonstrate that informed positioning of passively conducting plates can lead to improved vertical stability in NT configurations on par with stability metrics expected in PT scenarios. An optimal setup for passive plates in highly elongated NT devices is presented, where plates on the outboard side of the device reduce vertical instability growth rates to 16% of their baseline value. For lower target elongations, integration of passive stabilizers with divertor concepts can lead to significant improvements in vertical stability. Plates on the inboard side of the device are also uniquely enabled in NT geometries, providing opportunity for spatial separation of vertical stability coils and passive stabilizers.","PeriodicalId":20239,"journal":{"name":"Plasma Physics and Controlled Fusion","volume":"16 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Axisymmetric hybrid Vlasov equilibria with applications to tokamak plasmas 轴对称混合弗拉索夫平衡态在托卡马克等离子体中的应用

IF 2.2 2区物理与天体物理

Plasma Physics and Controlled Fusion Pub Date : 2024-05-02 DOI: 10.1088/1361-6587/ad4174

D A Kaltsas, A Kuiroukidis, P J Morrison and G N Throumoulopoulos

引用次数: 0

Mesoscopic transport in KSTAR plasmas: avalanches and the E × B staircase KSTAR 等离子体中的介观传输：雪崩和 E × B 阶梯

IF 2.2 2区物理与天体物理

Plasma Physics and Controlled Fusion Pub Date : 2024-05-01 DOI: 10.1088/1361-6587/ad4176

Minjun J Choi, Jae-Min Kwon, Lei Qi, P H Diamond, T S Hahm, Hogun Jhang, Juhyung Kim, M Leconte, Hyun-Seok Kim, Jisung Kang, Byoung-Ho Park, Jinil Chung, Jaehyun Lee, Minho Kim, Gunsu S Yun, Y U Nam, Jaewook Kim, Won-Ha Ko, K D Lee, J W Juhn and the KSTAR Team

{"title":"Mesoscopic transport in KSTAR plasmas: avalanches and the E × B staircase","authors":"Minjun J Choi, Jae-Min Kwon, Lei Qi, P H Diamond, T S Hahm, Hogun Jhang, Juhyung Kim, M Leconte, Hyun-Seok Kim, Jisung Kang, Byoung-Ho Park, Jinil Chung, Jaehyun Lee, Minho Kim, Gunsu S Yun, Y U Nam, Jaewook Kim, Won-Ha Ko, K D Lee, J W Juhn and the KSTAR Team","doi":"10.1088/1361-6587/ad4176","DOIUrl":"https://doi.org/10.1088/1361-6587/ad4176","url":null,"abstract":"The self-organization is one of the most interesting phenomena in the non-equilibrium complex system, generating ordered structures of different sizes and durations. In tokamak plasmas, various self-organized phenomena have been reported, and two of them, coexisting in the near-marginal (interaction dominant) regime, are avalanches and the E × B staircase. Avalanches mean the ballistic flux propagation event through successive interactions as it propagates, and the E × B staircase means a globally ordered pattern of self-organized zonal flow layers. Various models have been suggested to understand their characteristics and relation, but experimental researches have been mostly limited to the demonstration of their existence. Here we report detailed analyses of their dynamics and statistics and explain their relation. Avalanches influence the formation and the width distribution of the E × B staircase, while the E × B staircase confines avalanches within its mesoscopic width until dissipated or penetrated. Our perspective to consider them the self-organization phenomena enhances our fundamental understanding of them as well as links our findings with the self-organization of mesoscopic structures in various complex systems.","PeriodicalId":20239,"journal":{"name":"Plasma Physics and Controlled Fusion","volume":"11 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140839120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comment on ‘The influence of plasma evolution on a kinetic scenario of collisional relaxation of a magnetized plasma’ 就 "等离子体演化对磁化等离子体碰撞弛豫动力学方案的影响 "发表评论

IF 2.2 2区物理与天体物理

Plasma Physics and Controlled Fusion Pub Date : 2024-04-30 DOI: 10.1088/1361-6587/ad3fe4

Chao Dong, Ding Li

引用次数: 0

Reply to Comment on ‘The influence of plasma evolution on a kinetic scenario of collisional relaxation of a magnetized plasma’ 对 "等离子体演化对磁化等离子体碰撞弛豫动力学情景的影响 "评论的回复

IF 2.2 2区物理与天体物理

Plasma Physics and Controlled Fusion Pub Date : 2024-04-30 DOI: 10.1088/1361-6587/ad3eb1

V I Erofeev

引用次数: 0

On the upper bound of non-thermal fusion reactivity with fixed total energy 关于总能量固定的非热核聚变反应性上限

IF 2.2 2区物理与天体物理

Plasma Physics and Controlled Fusion Pub Date : 2024-04-24 DOI: 10.1088/1361-6587/ad3f4b

Huasheng Xie and Xueyun Wang

{"title":"On the upper bound of non-thermal fusion reactivity with fixed total energy","authors":"Huasheng Xie and Xueyun Wang","doi":"10.1088/1361-6587/ad3f4b","DOIUrl":"https://doi.org/10.1088/1361-6587/ad3f4b","url":null,"abstract":"Fusion reactivity represents the integration of fusion cross-sections and the velocity distributions of two reactants. In this study, we investigate the upper bound of fusion reactivity for a non-thermal reactant coexisting with a thermal Maxwellian background reactant while maintaining a constant total energy. Our optimization approach involves fine-tuning the velocity distribution of the non-thermal reactant. We employ both Lagrange multiplier and Monte Carlo methods to analyze Deuterium–Tritium (D–T) and proton-Boron11 (p-B11) fusion scenarios. Our findings demonstrate that, within the relevant range of fusion energy, the maximum fusion reactivity can often surpass that of the conventional Maxwellian–Maxwellian reactants case by a substantial margin, ranging from 50% to 300%. These enhancements are accompanied by distinctive distribution functions for the non-thermal reactant, characterized by one or multiple beams. These results not only establish an upper limit for fusion reactivity but also provide valuable insights into augmenting fusion reactivity through non-thermal fusion, which holds particular significance in the realm of fusion energy research.","PeriodicalId":20239,"journal":{"name":"Plasma Physics and Controlled Fusion","volume":"314 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140804020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Neural networks for turbulent transport prediction in a simplified model of tokamak plasmas 神经网络用于托卡马克等离子体简化模型中的湍流传输预测

IF 2.2 2区物理与天体物理

Plasma Physics and Controlled Fusion Pub Date : 2024-04-22 DOI: 10.1088/1361-6587/ad3eb0

L M Pomârjanschi

引用次数: 0