Journal of Plasma Physics最新文献_第10页

Generalized cross-helicity in non-ideal magnetohydrodynamics 非理想磁流体力学中的广义交叉螺旋度

IF 2.5 3区物理与天体物理

Journal of Plasma Physics Pub Date : 2023-12-01 DOI: 10.1017/s002237782300123x

Prachi Sharma, Asher Yahalom

引用次数: 0

Guiding-centre orbit-following simulations of charge exchange loss of NBI ions with the finite Larmor radius effect 有限Larmor半径效应下NBI离子电荷交换损失的导向中心轨道跟踪模拟

IF 2.5 3区物理与天体物理

Journal of Plasma Physics Pub Date : 2023-11-29 DOI: 10.1017/s0022377823001186

Yingfeng Xu, Fuqiong Wang, Yongliang Li, Fangchuan Zhong

{"title":"Guiding-centre orbit-following simulations of charge exchange loss of NBI ions with the finite Larmor radius effect","authors":"Yingfeng Xu, Fuqiong Wang, Yongliang Li, Fangchuan Zhong","doi":"10.1017/s0022377823001186","DOIUrl":"https://doi.org/10.1017/s0022377823001186","url":null,"abstract":"Guiding-centre orbit-following simulations of the charge exchange (CX) loss of neutral beam injection (NBI) ions are presented. The finite Larmor radius (FLR) effect in the fast ion–neutral collision can be included in guiding-centre orbit-following simulations by using the gyroaverage method. It is proved that the neutralization probability of fast ions computed by using the gyroaverage method in the guiding-centre orbit simulation is roughly the same as that computed in the full-orbit simulation when the time step in the guiding-centre simulation is the order of the gyroperiod. The CX losses of NBI fast ions for two NBIs in the EAST tokamak have been simulated by the guiding-centre orbit-following code GYCAVA, and the FLR effect in the fast ion–neutral collision on CX losses has been numerically studied. The CX effect of the fast ion–neutral collision can significantly enhance NBI ion losses on EAST. The FLR effect in the fast ion–neutral collision can enhance the CX loss. Vertical asymmetry of localized heat loads induced by CX losses is found, which is related to the FLR effect of fast ions and the strong radial gradient of the neutral density near the plasma edge. Heat loads induced by CX losses are localized in the regions near the poloidal angle $theta =-60^circ$ , because the likelihood of exchanging charge is the largest at gyrophase $xi ={rm pi}$ , and this leads to fast downwards moving neutrals. Fast ion loss fractions induced by CX increase with the neutral density increasing.","PeriodicalId":16846,"journal":{"name":"Journal of Plasma Physics","volume":"96 1-2","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138525230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Generation of energetic electrons by an electron cyclotron wave through stochastic heating in a spherical tokamak 球形托卡马克中电子回旋波通过随机加热产生高能电子

IF 2.5 3区物理与天体物理

Journal of Plasma Physics Pub Date : 2023-11-28 DOI: 10.1017/s0022377823001216

Mingyuan Wang, Shikui Cheng, Bing Liu, Shaodong Song, Dong Guo, Yunyang Song, Wenjun Liu, Debabrata Banerjee, Songjian Li, Tiantian Sun, Xiang Gu, Yingying Li, Jiaqi Dong, Yuejiang Shi, Y.-K. Martin Peng, Adi Liu

引用次数: 0

Nonlinear interaction of Alfvénic instabilities and turbulence via the modification of the equilibrium profiles 通过平衡剖面的修改，研究了气动系统的不稳定性与湍流的非线性相互作用

IF 2.5 3区物理与天体物理

Journal of Plasma Physics Pub Date : 2023-11-21 DOI: 10.1017/s0022377823001137

A. Biancalani, A. Bottino, D. Del Sarto, M.V. Falessi, T. Hayward-Schneider, P. Lauber, A. Mishchenko, B. Rettino, J.N. Sama, F. Vannini, L. Villard, X. Wang, F. Zonca, the ASDEX Upgrade team

引用次数: 0

Using rational surfaces to improve pellet fuelling in stellarators 使用合理的表面来改善仿星器中的颗粒燃料

IF 2.5 3区物理与天体物理

Journal of Plasma Physics Pub Date : 2023-11-16 DOI: 10.1017/s0022377823001010

N. Panadero, K. J. McCarthy, B. Pégourié, R. Carrasco, I. García-Cortés, R. García, J. Hernández-Sánchez, F. Köchl, J. Martínez-Fernández, R. Sakamoto, the TJ-II team

{"title":"Using rational surfaces to improve pellet fuelling in stellarators","authors":"N. Panadero, K. J. McCarthy, B. Pégourié, R. Carrasco, I. García-Cortés, R. García, J. Hernández-Sánchez, F. Köchl, J. Martínez-Fernández, R. Sakamoto, the TJ-II team","doi":"10.1017/s0022377823001010","DOIUrl":"https://doi.org/10.1017/s0022377823001010","url":null,"abstract":"<p>Pellet injection is currently the primary candidate for achieving efficient plasma fuelling, one of the key issues for steady-state operation in large fusion devices. In this paper, pellet injection experiments are performed for several magnetic configurations of the TJ-II stellarator. The aim of this study is to increase the understanding of the role played by rational surfaces in plasmoid drift and deposition profiles in stellarators. The analysis of experimentally observed plasmoid drifts is supported by simulations of such cases made with the HPI2 code. Plasmoid drift is found to be significantly reduced, as in tokamaks, in the vicinity of rational surfaces. This is attributed to the fact that plasmoid external charge reconnection lengths are shorter near rational surfaces, resulting in a more effective damping of the plasmoid drift. Although the effect of plasmoid external currents on the drift is expected to be negligible in stellarators, compared with those caused by plasmoid internal currents, the effect observed in TJ-II is clearly measurable. In addition, simulations show that enhanced drift reductions near rational surfaces lead to significantly different deposition profiles for the magnetic configurations included in this study. This implies that it should be possible to select the magnetic configurations to obtain more efficient pellet fuelling.</p>","PeriodicalId":16846,"journal":{"name":"Journal of Plasma Physics","volume":"C-25 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138525244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Resonant excitation of single Kelvin–Helmholtz high-order waves in a magnetized electron fluid vortex 磁化电子流体涡旋中单开尔文-亥姆霍兹高阶波的共振激发

3区物理与天体物理

Journal of Plasma Physics Pub Date : 2023-11-13 DOI: 10.1017/s0022377823001150

G. Maero, N. Panzeri, L. Patricelli, M. Romé

{"title":"Resonant excitation of single Kelvin–Helmholtz high-order waves in a magnetized electron fluid vortex","authors":"G. Maero, N. Panzeri, L. Patricelli, M. Romé","doi":"10.1017/s0022377823001150","DOIUrl":"https://doi.org/10.1017/s0022377823001150","url":null,"abstract":"Thanks to the isomorphism between the drift-Poisson and Euler equations, inviscid two-dimensional fluid experiments can be performed in magnetized, single-component plasmas in Penning–Malmberg traps. Within this analogy, a trapped electron plasma column is equivalent to a two-dimensional vortex. Here, we focus our attention on the generation of V-states, i.e. $l$ -fold symmetric rotating vorticity patches where the deformation with respect to the circular cross-section has reached the nonlinear regime. We detail a linear theoretical analysis and devise an experimental routine to generate V-states through the precise excitation of single Kelvin–Helmholtz perturbations in a magnetized electron plasma. This technique makes use of suitable multipolar rotating electric fields, which are shown to be able to select the desired wavemode. In particular, with rotating fields, a hardware limitation in the highest accessible mode is removed and nonlinear Kelvin–Helmholtz waves of generic order $l$ can be attained, which pave the way for further investigations on the evolution and stability properties of V-states. Systematic experimental results for the selective mode growth in the linear and nonlinear regimes up to saturation and collapse are discussed.","PeriodicalId":16846,"journal":{"name":"Journal of Plasma Physics","volume":"33 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136346491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

On the analytical description of the nonlinear stage of the Weibel instability in collisionless anisotropic plasma 无碰撞各向异性等离子体中维贝尔不稳定性非线性阶段的解析描述

3区物理与天体物理

Journal of Plasma Physics Pub Date : 2023-11-08 DOI: 10.1017/s0022377823001198

A.A. Nechaev, A.A. Kuznetsov, Vl.V. Kocharovsky

引用次数: 0

The available energy of trapped electrons: a nonlinear measure for turbulent transport 捕获电子的可用能量:湍流输运的非线性测量

3区物理与天体物理

Journal of Plasma Physics Pub Date : 2023-10-01 DOI: 10.1017/s0022377823001083

R.J.J. Mackenbach, J.H.E. Proll, R. Wakelkamp, P. Helander

{"title":"The available energy of trapped electrons: a nonlinear measure for turbulent transport","authors":"R.J.J. Mackenbach, J.H.E. Proll, R. Wakelkamp, P. Helander","doi":"10.1017/s0022377823001083","DOIUrl":"https://doi.org/10.1017/s0022377823001083","url":null,"abstract":"A collisionless plasma possesses a certain amount of ‘available energy’, which is that part of the thermal energy that can be converted into kinetic energy of plasma motion and electromagnetic fluctuations. In this paper we present a calculation of the available energy carried by trapped electrons in a slender non-omnigenous flux tube of plasma. This quantity is compared with gyrokinetic simulations of the nonlinear saturated radial energy flux resulting from turbulence driven by collisionless trapped-electron modes in various stellarators and a tokamak. The numerical calculation of available energy is fast and shows a strong correlation with the turbulent energy fluxes found in the gyrokinetic simulations. Indeed, the energy flux is found to be proportional to the available energy to the power of approximately $3/2$ , which is what one would expect from a simple argument. We furthermore investigate how available energy is distributed across different bounce wells, and it is found that deeply trapped electrons typically contribute most to the available energy. Finally, we investigate the dependence of available energy on gradient strength, and we find important differences between weakly and strongly driven regimes for stellarators and tokamaks.","PeriodicalId":16846,"journal":{"name":"Journal of Plasma Physics","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135760408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 3

Simulation study of the influences of beryllium on the tokamak start-up process 铍对托卡马克启动过程影响的模拟研究

3区物理与天体物理

Journal of Plasma Physics Pub Date : 2023-10-01 DOI: 10.1017/s002237782300106x

Yanli Peng, Yan Qiu, Shiqiu Zhao, Shali Yang

{"title":"Simulation study of the influences of beryllium on the tokamak start-up process","authors":"Yanli Peng, Yan Qiu, Shiqiu Zhao, Shali Yang","doi":"10.1017/s002237782300106x","DOIUrl":"https://doi.org/10.1017/s002237782300106x","url":null,"abstract":"Tokamak start-up is strongly dependent on the state of the initial plasma formed during plasma breakdown. To acquire a better understanding of the process and to estimate the influence of the impurity of beryllium on the ohmic heating tokamak start-up process, one-dimensional particle-in-cell coupled with a Monte Carlo collision method has been developed. The main aim is to investigate the plasma performance under various amounts of beryllium with different discharge parameters. Tokamak breakdown with the impurity of beryllium in the ohmic heating strategy has been simulated. The simulation results show that with the impurity of beryllium, the increase of plasma density is suppressed compared with the case without beryllium. The breakdown time is delayed by the impurity. Moreover, the successful breakdown has a much higher requirement on discharge parameters with a low electric field operational scenario, since in the low electric field discharge the influence of beryllium impurity is greater. As the plasma density increases, the effect of beryllium impurity on plasma becomes more critical. It indicates that impurities cannot be neglected in the high plasma density.","PeriodicalId":16846,"journal":{"name":"Journal of Plasma Physics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136093309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

An adjoint-based method for optimising MHD equilibria against the infinite-n, ideal ballooning mode 一种针对无限n理想气胀模式优化MHD平衡的伴随方法

3区物理与天体物理

Journal of Plasma Physics Pub Date : 2023-10-01 DOI: 10.1017/s0022377823000995

Rahul Gaur, Stefan Buller, Maximilian E. Ruth, Matt Landreman, Ian G. Abel, William D. Dorland

引用次数: 0