HL-2M 装置环向场线圈的工程研制与调试

介绍了 HL-2M 装置环向场(TF)线圈的工程设计、关键制造工艺及其调试结果。目前,TF 线圈最大通电电流达到 42kA,对应 TF 线圈产生的磁场为 0.66T,满足 HL-2M 装置初始放电需求。      

HL-2M 极向场线圈支撑结构分析评估

基于二维轴对称模型分析了极向场(TF)线圈在单零(SN)、双零(DN)、雪花(SF)和鼎位形下的电磁响 应,并评估了 4 种位形极限工况下支撑的力学性能。分析表明,PF6 线圈在放电初始时刻所受垂直电磁力最大, 可达到 1.9MN。在放电平顶结束时 PF5 线圈所受电磁力最大。在鼎位形下,PF5L 电磁力可达 2.6MN;雪花和双 零位形下,可达到 2.06MN。在这样极端的运行工况下,结构力学计算结果表明 PF 线圈支撑结构出现了局部塑性 变形。采用 ASMEVIII.2 作为评判准则,对局部高应力区进行评估,评估表明结构不存在塑性塌陷和局部失效。 而在上端主辐梁内侧支撑墩位置,螺栓所受轴力最大,需施加大于 50kN 的预紧力。     

HL-2M 装置电子回旋共振加热及电流驱动系统设计与研制进展

根据 HL-2M 装置物理实验加热的需求,完成了总功率为 8MW 的电子回旋共振加热及电流驱动 (ECRH/ECCD)系统设计,开展了波源、传输及天线等关键部件研制。8MW ECRH/ECCD 系统,由 8 套 105GHz/  1MW/3s 波源系统、8 条内径为 63.5mm 的真空传输线及三套极向实时可控的发射天线构成。目前,已完成 ECRH/ECCD 系统关键部件研制及其相关的桌面与高功率性能测试。测试结果表明,微波源回旋管输出微波功率 达到1MW/3s,在真空度为 10^‒2Pa 的过模波纹圆波导传输线中能低耗稳定传输,发射天线极向全量程角度转动响 应时间在 50ms 以内。      

Simulations of filamentary structure in an edge-localized mode burst on EAST using BOUT++ code

In this paper, simulation on the filamentary structure for the low-hybrid wave heating H-mode on experimental advanced superconducting tokamak (EAST) is carried out for the first time using BOUT++, and the speed and width of edge localized mode (ELM) filaments have been evaluated during the simulation. The evolutions of the ELM filaments are illustrated temporally and spatially. Then the results are compared with the experimental observations. It is found that at the peak gradient region in the outer midplane, the radial speed of the filaments is changed frequently and varied from 0.016 to 0.38 km/s. For the contrast, the poloidal speed oscillates in a narrower range of 0.68–0.88 km/s. The calculation results show the width of ELM filaments oscillates during the simulation, the minimum width is around 8.3 mm, and the maximum value is 41.24 mm. The distributions of the ELM filament widths with the radial position indicate the width is decreased with the radial position. Furthermore, by tracing one single filament, the radial width is decreased gradually when the filament is moving outward, which is also consistent with experiment conclusion. The consistencies also indicate the availability and practicability of the six-field two-fluid model of BOUT++ on the study of ELMs.     

Mean and oscillating plasma flows and turbulence interactions across the L-H confinement transition

A complex interaction between turbulence driven E × B zonal flow oscillations, i.e., geodesic acoustic modes (GAMs), the turbulence, and mean equilibrium flows is observed during the low to high (L-H) plasma confinement mode transition in the ASDEX Upgrade tokamak. Below the L-H threshold at low densities a limit-cycle oscillation forms with competition between the turbulence level and the GAM flow shearing. At higher densities the cycle is diminished, while in the H mode the cycle duration becomes too short to sustain the GAM, which is replaced by large amplitude broadband flow perturbations. Initially GAM amplitude increases as the H-mode transition is approached, but is then suppressed in the H mode by enhanced mean flow shear.     

HL—1M装置1998年物理实验进展报告

报道了ＨＬ－１Ｍ装置１９９８年度物理实验的进展情况。主要包括等离子体密度极限,中性束注入加热,离子回旋共振加热,低温杂波离子加热,多发弹丸注入,超声分子束注入等实验的情况。     

HT-7托卡马克上低杂波电流驱动实验中的快电子动力学

在低杂波电流驱动实验中，快电子的动力学对等离子体的品质有至关重要的影响。HT-7托卡马克上，新近发展了一套硬X射线阵列诊断系统用于快电子的动力学研究。本文给出了在不同的低杂波电流驱动实验中，例如高参数，长脉冲，以及反向电流驱动实验，快电子的动力学行为。     

Properties of geodesic acoustic modes and the relation to density fluctuations

The geodesic acoustic mode (GAM) is a high frequency branch of zonal flows, which is observed in toroidal plasmas. Because of toroidal curvature effects, density fluctuations are excited, which are investigated with the O-mode correlation reflectometer at TEXTOR. This Letter reports on the poloidal distribution of GAM induced density fluctuation and compares them with theoretical predictions. The influence of the GAM flows on the ambient turbulence is studied, too.     

中国环流器二号A装置(HL-2A)工程研制

中国环流器二号A装置(HL 2A)(设计指标:大半径1.65m、小半径0 4m、环向磁场2 8T、环向等离子体电流480kA)是我国已建成的第一个偏滤器托卡马克实验型磁约束聚变装置。HL 2A装置的首要研究目标是利用其独特的大体积极向偏滤器在高参数等离子体条件下开展与偏滤器位形运行有关的研究。本文总结了HL 2A装置工程设计、制造与安装、工程调试等研制的主要内容和关键技术。工程调试和初步物理实验的结果表明:HL 2A装置的主要工程参数和性能已具备开展物理实验的条件,并已成功地运行于偏滤器位形。2003年11月底,HL 2A装置获得等离子体电流168kA,等离子体存在时间920ms,等离子体线平均密度1.7×1019m-3,环向磁场1 4T,极限真空度为4.6×10-6Pa。     

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为充分利用SUNIST球形托卡马克欧姆场的双向磁通,延长等离子体电流平顶时间,对欧姆场的电源系统进行了改造。提出了一种基于多个IGBT并联大电流低频开关的H桥双向放电电路,研发了该双向放电电路的核心元件——3kV/10kA级的IGBT并联大电流开关。对单相电容准恒流充电电路与三相桥式电容换流充电回路进行了研究,合理地确定了双向放电主回路中两组储能电容器C1和C2的充电系统。经过安装、调试以及初步试验,在欧姆场线圈中得到了从正10kA到负6kA的双向放电电流,等离子体电流波形也有明显改善。