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tokamak

tokamak的相关文献在1990年到2022年内共计74篇,主要集中在原子能技术、自动化技术、计算机技术、数学 等领域,其中期刊论文74篇、相关期刊19种,包括南京邮电大学学报(自然科学版)、核技术、国外核新闻等; tokamak的相关文献由259位作者贡献,包括石秉仁、罗家融、李林忠等。

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论文:74 占比:100.00%

总计:74篇

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tokamak

-研究学者

  • 石秉仁
  • 罗家融
  • 李林忠
  • 邱励俭
  • 伍浩松
  • 夏凡
  • 张锦华
  • 李国相
  • 李晓东
  • 潘垣
  • 期刊论文

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    • 李晨曦; 伍浩松
    • 摘要: 【英国托卡马克能源公司网站2021年12月16日报道】英国托卡马克能源公司(Tokamak Energy)2021年12月16日宣布,用于确保超导磁体高效运行的低温或极低温电气设备设计取得重大突破:为真空低温恒温器研发了一种新型电源转换器。2021年11月的相关测试表明,该转换器将冷却磁体所需电力降低了50%。这将大幅减少未来聚变电厂的运行费用。
    • 廖亮; 梁云峰; 刘少承; 张华祥; 戢翔; 孙有文; 魏文崟; 王辉辉; 钱金平; 王亮; 贾曼妮; 曾龙; 高翔; the EAST Team
    • 摘要: An external resonant magnetic perturbation(RMP)field,which is an effective method to mitigate or suppress the edge localized mode(ELM),has been planned to be applied on the ELM control issue in ITER.A new set of magnetic perturbation coils,named as high m coils,has been developed for the EAST tokamak.The magnetic perturbation field of the high m coils is localized in the midplane of the low field side,with the spectral characteristic of high m and wide n,where m and n are the poloidal and toroidal mode numbers,respectively.The high m coils generate a strong localized perturbation field.Edge magnetic topology under the application of high m coils should have either a small or no stochastic region.With the combination of the high m coils and the current RMP coils in the EAST,flexible working scenarios of the magnetic perturbation field are available,which is beneficial for ELM control exploration on EAST.Numerical simulations have been carried out to characterize the high m coil system,including the magnetic spectrum and magnetic topology,which shows a great flexibility of magnetic perturbation variation as a tool to investigate the interaction between ELM and external magnetic perturbation.
    • 蒋鑫浩; 孙有文
    • 摘要: Accurate tokamak plasma equilibrium solution in flux coordinates is crucial for many stability and transport studies.Different approaches for dealing with singularities in solving the nonlinear Grad-Shafranov(GS)equation in flux coordinates or also known as straight field line coordinates are proposed in this paper.The GS equation is solved by iterating the position of grids directly in flux coordinates,and hence,no additional errors are introduced due to mapping process for a convergent solution.The singularity at magnetic axis in flux coordinates is removed by using a novel coordinate transform technique.Different from other techniques previously developed,no assumption in boundary condition at magnetic axis is used.This is consistent with the fact that there is no physical boundary at the magnetic axis.A flux coordinate system with poloidal coordinate chosen as the geometric poloidal angle is proposed.It conquers the difficulty in no definition of poloidal coordinate in flux coordinates at separatrix because of the singularity at x-point(s)in a divertor configuration.It also simplifies the process for computing poloidal flux coordinate during the iteration for solving the nonlinear GS equation.Non-uniform grids can be applied in both radial and poloidal coordinates,which allows it to increase the spacial resolution near x-point(s)in a divertor configuration.Based on the model proposed in this paper,a new Flux coordinates based EQuilibrium solver(FEQ)in tokamaks is developed.The numerical solutions from this code agree well with both the analytic Solov’ev solution and the numerical one from the EFIT code for a divertor configuration in the EAST tokamak.This code can be applied for simulating different equilibria with prescribed shape,pressure and current profiles,i.e.including both limiter and divertor configurations,positive triangularity and negative triangularity,differentβ,arbitrary magnetic shear profile etc.It provides a powerful and convenient fixed-boundary inverse equilibrium solver including both magnetic axis and separatrix in the solution for tokamak researches.
    • 伍浩松; 李晨曦
    • 摘要: 【英国托卡马克能源公司网站2022年3月10日报道】英国托卡马克能源公司(Tokamak Energy)近日宣布,其原型聚变堆ST40已实现1亿°C等离子体温度。这是太阳中心温度的7倍,并且是实现受控核聚变必须达到的温度。这是球形托卡马克装置首次实现这一重要里程碑。托卡马克能源公司主要开展球形托卡马克研究,因为在同一磁场强度下,球形托卡马克装置产生的等离子体压力比传统托卡马克装置高得多,即球形托卡马克的效率更高。
    • 杨吉星; 傅国勇; 申伟; 叶民友
    • 摘要: A linear simulation study of energetic passing particle-driven low-frequency fishbone instability in tokamak plasmas has been carried out using the global kinetic-MHD(magnetohydrodynamics)hybrid code M3D-K.This work is focused on the interaction of energetic passing beam ions and n=1 mode with a monotonic safety factor q profile and q_(0)<1.Specifically,the stability and mode frequency as well as mode structure of the n=1mode are calculated for scans of parameter values of beam ion beta,beam ion injection energy,beam ion orbit width,beam ion beta profile,as well as background plasma beta.The excited modes are identified as a low-frequency fishbone with the corresponding resonance of w_(Φ)+w_(θ)=w,where w_(Φ)is the beam ion toroidal transit frequency and w_(θ)is the beam ion poloidal transit frequency.The simulated mode frequency is approximately proportional to the beam ion injection energy and beam ion orbit width.The mode structure is similar to that of internal kink mode.These simulation results are similar to the analytic theory of Yu et al.
    • 孔浩喆; 王丰; 孙继忠
    • 摘要: Adiabatic response effects on high-frequency flshbone instability driven by passing energetic ions are studied.With flnite orbit width effects,the adiabatic contributionδW_(hf)is derived analytically for purely passing energetic ions.By approximating the adiabatic contribution to the flrst order of the reverse aspect ratioε,we derive one of its analytic expressions,which is expected to be more accurate than that in a previous work(Graves J P 2004 Phys.Rev.Lett.92185003).For high-frequency flshbone instability,nonadiabatic response is usually dominant over adiabatic response,but under certain circumstances the latter plays an important role,comparable to the former.With a more generalized distribution function by introducing Gaussian-type factors representing their pitch and radial dependences and using a slowing-down equilibrium distribution for the energy of energetic ions,numerical analysis indicates that the adiabatic contribution is conducive to stabilization of the mode and causes a decrease in mode frequency.In addition,we flnd that the adiabatic contribution has a weak stabilizing effect on the flshbone instability when the flnite orbit width effect is taken into account.We further analyze the dependence of the adiabatic contribution on the characteristic parameters of the distribution function.When the neutral beam has either a larger deviation from the plasma axis or a larger radial proflle,the adiabatic contribution has a more evident effect on the flshbone instability.When the neutral beam has a relatively small critical energy,the adiabatic contribution has a greater effect on the mode instability.
    • 李宜轩; 夏凡; 刘亮; 杨宗谕; 马瑞; 潘卫; 孙江; 朱晓博
    • 摘要: 等离子体可见光成像诊断系统作为托卡马克装置的重要诊断系统之一,具有实时监测等离子体位置与形状、观测真空室状况等功能,能够确保等离子体放电实验成功开展;本研究以HL-2M为平台设计研发了一套可见光成像诊断采集系统,本系统具有切向与广角两套成像诊断,可以直观准确地分析放电过程中的等离子体演化,包括等离子体击穿、维持、破裂和等离子体与壁相互作用等物理现象;系统的两套诊断通过镜头与传像光纤束进行等离子体可见光辐射的成像与传输,并以Lumenera Lt425C相机为采集和控制核心;以远程服务器控制本地并传输至数据库为控制模式,控制软件采用了VC++的多线程技术以及OpenCV软件库的图像处理技术,能够进行实时的可见光图像采集,并在放电结束后进行图像回放,同时系统具备色彩校准标定可以在装置复杂情况还原装置真实运行状态,系统具备参数配置功能,支持炮间更改参数,适应各种情况的物理实验,并有着一定的可移植性;本系统的开发研制可以满足HL-2M装置初始等离子体放电期间的运行基本要求,在HL-2M初始等离子体放电期间多以1800×1800的分辨率99 Hz的频率,能够清晰诊断出等离子体放电过程中的击穿、平顶、熄灭阶段,以及等离子体的位置与形状特性,且效果良好,为后续推广至其他的装置提供了解决方法。
    • 章坤; 丁锐; 彭姣; 鄢容; 陈俊凌; 朱大焕; 李长君; 司雄元
    • 摘要: Dust presented in experimental advanced superconducting tokamak(EAST)with mixed plasmafacing materials has been collected and characterized for the first time.Dust at different positions in the vessel was collected by vacuum cleaner after the first experimental campaign in 2019.The shape,composition,and size of dust particles have been analyzed using different methods.About 80%of the total number of dust particles have size between 20 and 80μm,and most of dust particles are spherical,while schistose shape,columnar and irregular shape were also found.With the help of energy-dispersive x-ray spectroscopy different elements of dust have been identified,which is generally consistent with the different plasma-facing components in EAST.Both x-ray fluorescence and inductively coupled plasma emission spectrometer are complementary methods for measuring the dust composition quantitatively.It was found that the major components of dust were lithium dust in the form of lithium carbonate and lithium hydroxide,which is due to the routine lithium wall conditioning during EAST operation.
    • Jiangang Li; Yuanxi Wan; the EAST team
    • 摘要: 1.Introduction New sustainable energy is urgently needed to meet the fastgrowing requirement for clean energy in this century.Nearly 80%of the world’s energy is still generated by burning fossil fuels,resulting in pollution and climate change.To realize long-term sustainable development,it is necessary to explore large-scale new energy sources that do not produce carbon dioxide(CO_(2)),within the next few decades.
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