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三炼钢1号板坯连铸机大断面改造后铸坯输送辊道频频损坏、铸坯跑偏,通过改造辊道旧辊,改造辊道底座,选用底座固定式减速机,在传动系统中增设有吸振功能的十字万向联轴器,降低辊道冲击载荷尖峰值,明显增强设备抗冲击能力,有效地解决了铸坯跑偏问题。 相似文献
23.
付静 黄娟 王进芳 虞立敏 常加峰 何开洋 黄跃恒 李磐 高伟 金仡飞 贾天琦 王敏锐 孙延旭 史唱 王书松 王曦辉 赵海林 郑艺峰 谢亚红 钟国强 臧庆 刘海庆 钱金平 《等离子体科学和技术》2024,47(12):125103-1-125103-13
A key physics issue for achieving steady-state high-performance plasmas on EAST tokamak is to decrease beam-ion losses to improve plasma confinement during neutral beam injections (NBIs). To decrease the beam losses, previous counter-I p NBI injections are upgraded to co-I p injections. Analysis shows that due to the reversed direction of drift across the flux surfaces caused by the pitch angle, the beam prompt loss fraction decreases from about 49% to 3% after the upgrade. Moreover, because of the change of entire beam path, beam shine-through (ST) loss fraction for counter-I p tangential and counter-I p perpendicular injections is reversed to co-I p tangential and co-I p perpendicular injections, respectively. Due to the change in the initial trapped-confined beam ion fraction caused by the peaked pitch profiles, the losses induced by toroidal ripple field are also reversed after the upgrade. To further improve the beam-ion confinement under the present NBI layout, the amplitudes of toroidal field are increased from 1.75 to 2.20 T. Result shows that, due to the smaller orbit width and peaked pitch angle profile, the beam prompt loss power is lower with higher toroidal field. Due to the synergy of higher initial trapped-confined beam ion fraction and narrower Goldston-White-Boozer (GWB) boundary, the loss induced by ripple diffusion is higher with higher toroidal field. The combined effect of beam ST loss, prompt loss and ripple loss, contributes to the increase in beam ion density. The decrease in beam loss power enhances beam heating efficiency, especially the fraction of beam heating ions. Finally, comparison between simulation and measurement by 235U fission chamber (FC) indicates that the increase in neutron rate is mainly contributed by improvement of beam-ion confinement. This study can provide potential support for beam operation and high-T i experiment on EAST tokamak. 相似文献
24.
李恭顺 张涛 耿康宁 文斐 叶凯萱 徐立清 朱翔 张学习 钟富彬 周振 杨书琪 周子强 喻琳 兰婷 王守信 提昂 张寿彪 刘海庆 李国强 高翔 《等离子体科学和技术》2024,69(3):034001-1-034001-9
In this paper we present a new experimental observation using a conventional reflectometry technique, poloidal correlation reflectometry (PCR), in the Experimental Advanced Superconducting Tokamak (EAST). The turbulence spectrum detected by the PCR system exhibits an asymmetry and induced Doppler shift $ {f}_{mathrm{D}} $ during the internal kink mode (IKM) rotation phase. This Doppler shift $ {f}_{mathrm{D}} $ is the target measurement of Doppler reflectometry, but captured by conventional reflectometry. Results show that the Doppler shift $ {f}_{mathrm{D}} $ is modulated by the periodic changes in the effective angle between the probing wave and cutoff layer normal, but not by plasma turbulence. The fishbone mode and saturated long-lived mode are typical IKMs, and this modulation phenomenon is observed in both cases. Moreover, the value of the Doppler shift $ {f}_{mathrm{D}} $ is positively correlated with the amplitude of the IKM, even when the latter is small. However, the positive and negative frequency components of the Doppler shift $ {f}_{mathrm{D}} $ can be asymmetric, which is related to the plasma configuration. A simulated analysis is performed by ray tracing to verify these observations. These results establish a clear link between $ {f}_{mathrm{D}} $ and IKM rotation, and are helpful for studying the characteristics of IKM and related physical phenomena. 相似文献
25.
汪兴康 毛文哲 谢锦林 兰涛 李弘 刘阿娣 周楚 温晓辉 卫子安 吴捷 陈晨 刘东宽 饶贤昊 蔡虎 邬佳仁 邓鹏 刘海庆 丁卫星 庄革 刘万东 《等离子体科学和技术》2024,28(3):034009-1-034009-5
A multi-channel polarimeter–interferometer has been developed on the Keda Torus eXperiment (KTX) for the study of equilibrium dynamics and internal magnetic fluctuations. A three-wave technique based on terahertz solid-state sources (~650 GHz) is applied for simultaneous measurements of electron density and Faraday rotation angle. The output power of the microwave source is 2 mW. Faraday rotation effect using a rotating wave plate is tested with phase noise less than 0.8°, and the density phase noise is less than 0.9°. Measurement of Faraday rotation angle and density for discharges on KTX have demonstrated high sensitivity to internal MHD activities. 相似文献
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27.
The equilibrium reconstruction is important to study the tokamak plasma physical processes.To analyze the contribution of fast ions to the equilibrium,the kinetic equilibria at two time-slices in a typical H-mode discharge with different auxiliary heatings are reconstructed by using magnetic diagnostics,kinetic diagnostics and TRANSP code.It is found that the fast-ion pressure might be up to one-third of the plasma pressure and the contribution is mainly in the core plasma due to the neutral beam injection power is primarily deposited in the core region.The fast-ion current contributes mainly in the core region while contributes little to the pedestal current.A steep pressure gradient in the pedestal is observed which gives rise to a strong edge current.It is proved that the fast ion effects cannot be ignored and should be considered in the future study of EAST. 相似文献
28.
丁卫星 刘海庆 钱金平 张寿彪 D L BROWER 邹志勇 李维明 杨曜 曾龙 谢锦林 朱平 俞昌旋 兰婷 王守信 连辉 揭银先 胡立群 万宝年 《等离子体科学和技术》2018,20(9):94001-11
We report on current profile evolution in EAST NBI driven plasmas where two neutral beams are injected,one during the current ramp phase and the second during flattop.At the end of the current ramp phase,it is found that a flat q profile with q0?~?1 is achieved with low magnetic shear in the core.It is observed that plasma current and density both relax much faster than resistive time,even in the absence of sawtooth activity when H–L transition occurs.Density fluctuations associated with magnetic perturbations(3/2) as a precursor to the H–L transition are observed.It is likely that these modes play a role in fast current transport. 相似文献
29.
水利工程是我国国民经济和社会发展的重要物质基础。长期以来,水利工程在防洪、排涝、防灾、减灾等方面对国民经济的发展做出了重大的贡献,同时在工业生产、农业灌溉、居民生活、生态环境等生产经营管理中发挥了巨大的作用。而水利工程施工是水利工程建设的重要阶段,是将蓝图变成现实的过程。因此必须采取切实有效的措施,提高施工管理水平,提高工程建设的质量。 相似文献
30.
A single-channel far-infrared （FIR） laser interferometer was developed to measure the line averaged electron density on the EAST tokamak. The structure of the single-channel FIR laser interferometer is described in detail. The evolution of density sawtooth oscillation was measured by means the FIR laser interferometer, and was identified by electron cyclotron emission （ECE） signals and soft X-ray intensity. The discharges with and without sawtooth were compared with each other in the Hugill diagram. 相似文献