Plasma Physics and Controlled Fusion最新文献_第2页

Electron acceleration in the electron dissipation region of asymmetrical magnetic reconnection driven by ultra-intensity lasers 超强激光驱动的非对称磁性再连接电子耗散区的电子加速

Plasma Physics and Controlled Fusion Pub Date : 2024-05-21 DOI: 10.1088/1361-6587/ad4e67

Zhang Qian, Y. Ping, Weiming An, Jiayong Zhong

引用次数: 0

Numerical study of the inﬂuence of electron inertial effects and electron dynamics on tearing mode instability 电子惯性效应和电子动力学对撕裂模式不稳定性影响的数值研究

Plasma Physics and Controlled Fusion Pub Date : 2024-05-21 DOI: 10.1088/1361-6587/ad4e66

Botong Shi, Jiaqi Wang, Dongjian Liu, Zhiwei Ma

{"title":"Numerical study of the inﬂuence of electron inertial effects and electron dynamics on tearing mode instability","authors":"Botong Shi, Jiaqi Wang, Dongjian Liu, Zhiwei Ma","doi":"10.1088/1361-6587/ad4e66","DOIUrl":"https://doi.org/10.1088/1361-6587/ad4e66","url":null,"abstract":"\u0000 The tearing mode instabilities were numerically studied in two distinct models: the finite electron inertial magnetohydrodynamics (MHD) and the electron MHD (EMHD). The finite electron inertial MHD model employed a modified Hall-MHD model that incorporated the electron inertial effects in the generalized Ohm's Law. On the other hand, the electron dynamics were described by the EMHD model. It is found that both electron inertial effects and electron dynamics significantly influence the linear and nonlinear growth of tearing mode instabilities, with electron dynamics playing a more dominant role. The dependence of the linear growth rate of tearing modes on the electron inertial length d_e was investigated. The results show that electron inertial effects enhance the growth rate but resemble the behavior of resistivity η. Whereas, in the EMHD model, electron inertia plays a dominant role in tearing mode instabilities. Additionally, a study on the nonlinear saturation of (2,1) tearing modes was conducted, demonstrating consistency with relevant analytical theories. The study indicates that, in both models, the magnetic island exhibits faster growth and achieves a larger saturated island width as d_e increases.","PeriodicalId":510623,"journal":{"name":"Plasma Physics and Controlled Fusion","volume":"103 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141116054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Macroscopic trends of linear tearing stability in cylindrical current profiles 圆柱形电流曲线线性撕裂稳定性的宏观趋势

Plasma Physics and Controlled Fusion Pub Date : 2024-05-21 DOI: 10.1088/1361-6587/ad4e68

Stuart Royce Sands Benjamin, C. Clauser, Cristina Rea, R. Sweeney, Arunav Kumar, Earl S Marmar

{"title":"Macroscopic trends of linear tearing stability in cylindrical current profiles","authors":"Stuart Royce Sands Benjamin, C. Clauser, Cristina Rea, R. Sweeney, Arunav Kumar, Earl S Marmar","doi":"10.1088/1361-6587/ad4e68","DOIUrl":"https://doi.org/10.1088/1361-6587/ad4e68","url":null,"abstract":"\u0000 The likelihood of realising tokamak power-plants will be greatly improved by the discovery of high-gain equilibria that resist the formation of small islands and hence avoid the disruptive neoclassical tearing mode. We propose a series of studies to understand how simple tokamak design can leverage aspects of tearing onset physics to maximise passive resistance to island formation. Here we investigate the variation that current profiles can bring about in preventing tearing onset through the cylindrical linear tearing stability parameter ∆′. A database of 159148 realistic pilot-plant current profiles was generated with Monte Carlo sampling, and the distribution of ∆′ values was linked with interpretable profile characteristics. In agreement with prior theoretical and experimental studies, ∆′ was found to be strongly correlated with the existence and steepness of a local toroidal current well or hill, with the former destabilising and the latter stabilising. In the absence of these two cases, the remaining ∆′ values were linearly bounded by the toroidal current gradient at the rational surface.","PeriodicalId":510623,"journal":{"name":"Plasma Physics and Controlled Fusion","volume":"14 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141117297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experiments and modelling of negative triangularity ASDEX Upgrade plasmas in view of DTT scenarios 针对 DTT 方案的负三角形 ASDEX 升级等离子体的实验和建模

Plasma Physics and Controlled Fusion Pub Date : 2024-05-17 DOI: 10.1088/1361-6587/ad4d1c

Lorenzo Aucone, Paola Mantica, Tim Happel, Joerg Hobirk, T. Pütterich, Branka Vanovac, C. F. B. Zimmermann, Matthias Bernert, Tommaso Bolzonella, Marco Cavedon, M. Dunne, Rainer Fischer, Paolo Innocente, Athina Kappatou, Rachael M McDermott, A. Mariani, Paola Muscente, U. Plank, Francesco Sciortino, Giovanni Tardini

{"title":"Experiments and modelling of negative triangularity ASDEX Upgrade plasmas in view of DTT scenarios","authors":"Lorenzo Aucone, Paola Mantica, Tim Happel, Joerg Hobirk, T. Pütterich, Branka Vanovac, C. F. B. Zimmermann, Matthias Bernert, Tommaso Bolzonella, Marco Cavedon, M. Dunne, Rainer Fischer, Paolo Innocente, Athina Kappatou, Rachael M McDermott, A. Mariani, Paola Muscente, U. Plank, Francesco Sciortino, Giovanni Tardini","doi":"10.1088/1361-6587/ad4d1c","DOIUrl":"https://doi.org/10.1088/1361-6587/ad4d1c","url":null,"abstract":"\u0000 The paper presents experimental and modelling results of a comparison of negative (NT) and positive (PT) triangularity ASDEX Upgrade (AUG) discharges using the plasma shapes presently foreseen in the DTT tokamak, under construction in Italy. This work is part of a broader effort of investigation to understand whether the good properties observed in NT scenarios in DIII-D and TCV may be extrapolated to the DTT device and more in general to DEMO future operations. The experimental results have shown a practical gain of running these AUG plasmas with only ECRH and mixed NBI+ECRH phases in negative triangularity, even if they access the H-mode. Indeed, the NT electron kinetic profiles recover in all cases the PT electron pressures inside mid-radius due to reduced transport in the region ρtor = 0.7 − 0.9, while exhibit lower individual ELM (Edge Localised Mode) energy losses. The ion pressure and expected fusion performance are comparable in the case of similar densities. Integrated modelling has been performed using the transport solver ASTRA and the quasi-linear turbulent model TGLF, investigating the transport properties of these discharges. The modelling reproduces the experiments qualitatively with reasonable accuracy. Nonetheless, the heat transport in NT cases is partially overestimated. This may be because TGLF uses the Miller equilibrium, which approximates the magnetic flux surfaces as up-down symmetric. In the case of these asymmetric NT shapes, the simulated outer surfaces lose part of the tilt with respect to the z-axis, reducing the upper δ < 0 effect. A numerical test to discern the impact of the geometry by symmetrically flipping the shape has shown a beneficial effect of the negative triangularity on heat transport.","PeriodicalId":510623,"journal":{"name":"Plasma Physics and Controlled Fusion","volume":"48 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140965729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An overview of the preparation and implementation of the Safety Case in support of the 2nd JET Deuterium-Tritium Experiment 支持第二次 JET 氘氚实验的安全案例的编制和实施概览

Plasma Physics and Controlled Fusion Pub Date : 2024-05-17 DOI: 10.1088/1361-6587/ad4d1b

Jane Johnston, David Perry

引用次数: 0

Non-uniformity of fluctuation characteristics inside an edge magnetic island in Heliotron J Heliotron J 中边缘磁岛内部波动特性的不均匀性

Plasma Physics and Controlled Fusion Pub Date : 2024-05-10 DOI: 10.1088/1361-6587/ad49d5

A. Miyashita, S. Ohshima, R. Matoike, F. Kin, S. Kobayashi, S. Kado, T. Minami, T. Mizuuchi, S. Konoshima, Hiroyuki Okada, S. Inagaki, K. Nagasaki

{"title":"Non-uniformity of fluctuation characteristics inside an edge magnetic island in Heliotron J","authors":"A. Miyashita, S. Ohshima, R. Matoike, F. Kin, S. Kobayashi, S. Kado, T. Minami, T. Mizuuchi, S. Konoshima, Hiroyuki Okada, S. Inagaki, K. Nagasaki","doi":"10.1088/1361-6587/ad49d5","DOIUrl":"https://doi.org/10.1088/1361-6587/ad49d5","url":null,"abstract":"\u0000 Non-uniform fluctuation characteristics are observed within an edge magnetic island in Heliotron J. The island possesses a long connection length comparable to the confined region. These fluctuations are measured using a Langmuir probe. The island’s presence is confirmed through the plasma response, observed in the modulation amplitude of electron temperature and its phase delay relative to the heat source in a heat modulation experiment. Within the island, the electron density is notably high, accompanied by distinct profiles of electron temperature and electric field, likely attributable to the magnetic island. Contrary to expectations, density fluctuations within the edge magnetic island are not locally minimized, despite the reduced gradient of the profile within the island. Statistical analysis shows a suppression of intermittent transport inside the island, while intermittent fluctuations increase towards the exterior. A further analysis to segregate turbulence-driving and spreading factors reveals that both turbulence-driven and spreading contributions are comparably significant inside the island. Additionally, the non-uniform turbulence results in a spatially structured fluctuation-driven particle flux. Overall, the experimental findings indicate that fluctuation characteristics exhibit notable non-uniformity both inside and near the island. This non-uniformity potentially complicates heat transport and may lead to three-dimensional, asymmetric transport within and at the periphery of the islands.","PeriodicalId":510623,"journal":{"name":"Plasma Physics and Controlled Fusion","volume":" 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140993813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrabright attosecond gamma ray from irradiating solid foil with tailored vortex laser pulse 用定制涡旋激光脉冲照射固体箔片产生的超亮阿秒伽马射线

Plasma Physics and Controlled Fusion Pub Date : 2024-05-08 DOI: 10.1088/1361-6587/ad48b6

L. Ju, Chaoneng Wu, Ran Li, Hua Zhang, Si-zhong Wu, Ming-Young Yu, Taiwu Huang, Cang-tao Zhou, Shuangchen Ruan

{"title":"Ultrabright attosecond gamma ray from irradiating solid foil with tailored vortex laser pulse","authors":"L. Ju, Chaoneng Wu, Ran Li, Hua Zhang, Si-zhong Wu, Ming-Young Yu, Taiwu Huang, Cang-tao Zhou, Shuangchen Ruan","doi":"10.1088/1361-6587/ad48b6","DOIUrl":"https://doi.org/10.1088/1361-6587/ad48b6","url":null,"abstract":"\u0000 Intense attosecond light sources are required for investigating ultrafast electron dynamics, such as in molecules and atoms, etc. However, so far their achievable photon energy remains at the keV level, thus limiting their range of applications. For instance, probing intranuclear dynamics requires photon energies in the gamma-ray regime. Here we propose a scheme for generating intense attosecond gamma-ray pulses by irradiating a thin solid-density foil with tailored intense vortex laser. In the interaction, the laser driven foil electrons are differentially accelerated within a quarter-wave field and become highly bunched. Three-dimensional particle-in-cell simulations show that they efficiently (at ∼ 30% conversion efficiency) radiate ultrashort (∼ 400as), high-flux (> 1010 photons per pulse), and ultrabrilliant (up to 1027 photons s−1 mm−2 mrad−2 per 0.1% BW at 1 MeV photon energy) gamma ray. With an X-ray driving laser, the scheme can even produce isolated bright sub-attosecond gamma-ray pulses that are useful for time-resolved nuclear spectroscopy and many other areas.","PeriodicalId":510623,"journal":{"name":"Plasma Physics and Controlled Fusion","volume":" 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140999855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Existence of a detachment cliff at ASDEX Upgrade ASDEX 升级版存在支队悬崖

Plasma Physics and Controlled Fusion Pub Date : 2024-05-07 DOI: 10.1088/1361-6587/ad481d

Luca Scotti, M. Cavedon, Matthias Bernert, D. Brida, Bernd Kurzan, Ralph Dux

{"title":"Existence of a detachment cliff at ASDEX Upgrade","authors":"Luca Scotti, M. Cavedon, Matthias Bernert, D. Brida, Bernd Kurzan, Ralph Dux","doi":"10.1088/1361-6587/ad481d","DOIUrl":"https://doi.org/10.1088/1361-6587/ad481d","url":null,"abstract":"\u0000 The detachment cliff is a bifurcative transition to partial detachment recently discovered at the DIII-D tokamak. This work presents a database analysis of target parameters in L-mode and H-mode discharges to search for a detachment cliff at ASDEX Upgrade (AUG). Most of the transitions from attached to partially detached divertor conditions observed in H- and L-mode discharges in AUG show bifurcative-like characteristics that are consistent with the properties of the detachment cliff if the Bx∇B drift is directed towards the active X-point. In the operational space of power and density, the bifurcative transitions identified during an L-mode discharge occur at injected power and density higher than a threshold value Ptot > 0.7 MW and ne > 1.6 x 1019 m-3, respectively). Furthermore, the temperatures at which the transitions start are found to be insensitive to the injected impurity, to the injected power and to the value of the upstream density. Finally, the study of the evolution of the target parameters, of the intensity of the Dα line and of specific manometers and bolometer lines of sights shows that the physical process underlying the detachment cliff and the self-sustained divertor oscillations might be the same.","PeriodicalId":510623,"journal":{"name":"Plasma Physics and Controlled Fusion","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141003161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulations on loss of ICRF-heated NBI ions in EAST 关于 EAST 中经 ICRF 加热的 NBI 离子损失的数值模拟

Plasma Physics and Controlled Fusion Pub Date : 2024-05-07 DOI: 10.1088/1361-6587/ad481e

C. Song, Ji Wang, Bin Wu, Lan Yin, Xueyu Gong, Baolong Hao, Yuqing Chen, Qian-hong Huang, Yijun Zhong, Yahong Xie, Yuanlai Xie

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Velocity-space distribution function of fast ions in a sawtoothing plasma 锯齿等离子体中快速离子的速度空间分布函数

Plasma Physics and Controlled Fusion Pub Date : 2024-05-07 DOI: 10.1088/1361-6587/ad481c

Tommaso Barberis, Francesco Porcelli

引用次数: 0