改善FEB排灰效率并减少氚投料的探讨

α粒子灰在靶板上中性化后成为氦原子,一部分未被抽走,它们在偏滤器等离子体中扩散的平均自由程较长(～10cm)有可能再电离回到SOL,我们如果用RF场的有质动力势将这部分再电离的He~ 反射回靶板附近,如同射频堵漏的机理,它的存在又不影响He~( )继续流向靶板。这种射频有质动力同时又可以将氚离子从偏滤器喉管处反射回主体等离子体,既改善排灰效率又减少氚投料量。本文计算了对排灰效率的影响。     

托卡马克增强约束态的排氦研究

由于氦在当前托卡马克放电实验和将来D-T聚变反应堆中的特殊作用,通常将氦和其它杂质分开来研究。首先,几乎现有的托卡马克装     

HL-1M托卡马克等离子体转动数值研究

H模的发现为当今托卡马克实验和优化下一代托卡马克设计提供了改善能量约束的途径,对L-H模转变的机理探讨,逐步从唯象学向自治理论发展。等离子体转动与L-H-VH模转变密切相关。实验观察到L-H模转变期间极向转动速度及其梯度的突然增加以及增加的速度剪切对抑制微观湍流的作用。而在VH模期间,环向转动速度剪切在Spinup时刻随能量约束增强因子迅速增加,剪切穿透深度达ρ=0.65。在高βH模放电中,在r/a=0.8～     

Fuelling and Diagnostics with Pellet Injection in the HL-1M Tokamak

The pellet injection experiments for fuelling and diagnostics have been carried out on the HL-1M tokamak. The eight-pellet injector was installed on HL-1M. A reliable monitordetector and camera system was set up to take initial pellet photographs and measure the initial pellet speed and size. High fuelling efficiency of 60 % - 100 % and a density profile with a peaking factor of 1.8 - 2.0 were obtained. The maximum density close to 10^14/cm^3 in HL-1M was achieved with newly optimized combined fuelling techniques. Two typical models of pellet ablation have been utilized for simulative calculation of the ablation rates in HL-1M. In comparison with the distribution of the measured Hα emission intensity from the digital data of the CCD camera, the experimental result seems more optimistic for core fuelling than theoretical predictions by the two models. The safety factor profile q（r） has been extracted from the information provided by the CCD camera during the pellet injection. The reliability of the measured results depends mainly on the calibration of the imaging space position. Based on the calibration, the measured q-profile becomes more reasonable than those published previously for the same shot number and same photograph.     

高温D－~3He等离子体聚变产物的即时能谱展宽计算

从动量守恒和能量守恒关系式出发，通过反应前后坐标系之间的转换，利用Ｓ．Ｐｅｒｋｉｎｓ计算反应粒子带入反应的平均能量的方法，引入一个等效动力学温度，得到的质子和α粒子即时能谱最大展宽与Ｇ．Ｌｅｈｎｅｒ用其它方法算得的即时能谱半宽度合理地接近。结果对开端位形的高能带电粒子直接能量收集器设计有参考价值。     

Interaction of Impurity （Li, Be, B and C） and Hydrogen Isotope Pellet Injection with Reactor-relevant Plasmas

Based on the two-dimensional kinetic ablation theory of the hydrogen pellet ablation developed by Kuteev [B.V. Kuteev, Nuclear Fusion, 35 (1995) 431], an algorithm of erosion speed and ablation rate calculations for Li, Be, and B impurity pellets in reactor-relevant plasma has been derived. Results show compatibilities of lithium pellet injection used in α-particle diagnostics are positive in comparison with other solid impurity pellets (e.g. Be, B and C). Using the 2-D Kuteev lentil model, including kinetic effects, we find that currently existing pellet injection techniques will not meet core-fueling requirements for ITER-FEAT. A pressure as high as 254 MPa must be applied to a pellet accelerator with a 200 cm-long single-stage pneumatic gun, in order to accelerate a pellet with a radius rpo = 0.5 cm to a velocity of vpo, 24 × 105 cm/s penetrating 100 cm into the ITER plasma core. Comparisons of pellet velocity- and radius-dependent penetration depth between the Neutral Gas Shielding and the Kuteev's     

基于多信息融合技术的国土空间规划体系设计

常规技术中国土空间规划体系数据采集效率低、分析能力落后。利用无人机群和嵌入式技术,对国土空间规划信息进行采集。构造了基本的信念分配函数,将每个国土空间规划信息数据簇集的输出特征作为加权原始证据,并对原始证据进行权重分配,将D-S证据理论的融合规则应用于每个簇头,实现多源国土空间规划信息证据的融合,最终输出融合结果。实验结果表明,本方法中国土空间规划信息采集能力强,数据信息处理效率高。     

ITER的靶丸加料计算(英文)

运用考虑动力效应的Kuteev2-D透镜模型,数值计算了靶丸在国际热核实验堆(ITER)中的消融率,讨论了目前现有的加料工艺的技术困难和可能的解决办法。数值积分结果发现目前已有的靶丸加料技术很难满足堆级等离子体ITER中心加料的要求,计算表明对一个2m长的单级气动枪要加速一个半径0.5cm的靶丸达到速度24.27km/s才能渗透ITER等离子体100cm。用两种典型的消融理论计算了渗透深度与靶丸速度和半径的依赖关系并作了比较。新近的研究从高场侧(HFS)注入靶丸来改善芯部加料效率可能给芯部加料困难贡献一种解决办法,对相关的问题作了讨论。     

HL-1M边缘区径向电场对等离子体转动的影响

我们曾经用计算程序ROTATE编码对HL-1M托卡马克常规运行参数下的主离子与杂质离子的环向转动速度和极向转动速度进行理论模拟计算和比较研究。在这个计算程序里我们挑选了3个具有代表性的等离子体转动理论模型:Hazeltine的标准新经典理论模型,Kim等人区分主离子和杂质离子的转动理论模型,Hinton等人考虑电场梯度对离子转动速度的影响,引     

五种组合氢同位素靶丸消融率的修正(英文)

对五种不同组合的固态氢同位素靶丸H2,HD,D2,DT和T2在聚变等离子体中的消融率首次作了修正研究。结果表明由于同位素效应引起的靶丸半径烧蚀率修正从氢靶丸的1下降到氚靶丸的0.487,因此在消融率计算时是不可忽略的。这些修正可导致更深的质量沉积和改善加料效率。