Density Modulation Experiments to Determine Particle Transport Coefficients on HT-7 Tokamak

The particle diffusion coefficient and the convection velocity were studied based on the density modulation using D2 gas puffing on the HT-7 tokamak. The density was measured by a five-channel FIR interferometer. The density modulation amplitude was 10% of the central chord averaged background density and the modulation frequency was 10 Hz in the experiments. The particle diffusion coefficient （D） and the convection velocity （V） were obtained for different background plasmas with the central chord averaged density 〈ne〉 = 1.5×10^19m^-3 and 3.0×10^19 m^-3 respectively. It was observed that the influence of density modulation on the main plasma parameters was very weak. This technology is expected to be useful for the analysis of LHW and IBW heated plasmas on HT-7 tokamak in the near future.     

Control System of Pellet Injector on the HT-7 Tokamak

1. IntroductionHefei tokamak:7 (HT-7) is a super-conductingtokamak device which was rebuilt from the originalRussian T-7 tokamak in 1994. Recently a feedbackcontrol system to simultaneously control plasma current, density and displacement has been developedon the HT-7 and put into daily operation. HT-7with R = 1.22 m, a = 0.26 ~0.30 m has afstainless steel liner, and two immovable and two movablestainless steel liciters (including a movable liciter)with molybdenum tips. There are two layer…     

HT-7托卡马克氘丸注入实验研究

简要介绍了用于国家中型超导托卡马克装置HT-7弹丸注入系统;详细阐述了在HT-7装置首次用于加料实验的氘(D2)丸的成冰工艺、氘丸注入实验以及氘丸注入对等离子体产生的影响;研究了等离子体的密度、温度的分布变化。     

HT—7弹丸注入远程控制系统

详细介绍了HT－7弹丸注入远程控制系统,包括硬件系统,控制接口和软件系统,硬件系统由现场控制器,AI卡,DO卡等组成,基于工控PC平台和Windows操作系统的控制软件是用Blrland Delphi4.0开发的,最后简要介绍了HT－7弹丸注入实验的结果。     

太赫兹连续波DCN激光器的实验研究

介绍了运行在1.54THz(195μm)和1.58THz(190μm)的波导型辉光放电激励的大功率连续波DCN激光器的开发和研制工作.该激光器的谐振腔长3.4m,放电长度3m,谐振腔由耐热玻璃制成,直径54mm.谐振腔一端为平面反射镜,一端为金属栅网.工作气体为N2,CD4和He(或D2)的混合气体,在1.54THz的连续激光输出功率大于0.2W.实验中对放电电流、激光管温度、气压等参数进行了优化,研究了EH11模DCN激光在自由空间的传输特性.研究表明,利用新的N2,CD4和D2混合气体的太赫兹DCN激光器可以得到稳定连续的高功率放电.光束传输远场满足高斯分布(z>4m),对各种参数进行优化后,190μm和195μm窗口处输出EH11模功率分别为0.15W和0.16W,可以满足超导托卡马克连续运行的干涉测量的需要.     

浅析电子式电流互感器高电位侧电路功能

随着电力系统向高电压、大容量和数字化方向的发展，必然对电力系统的测量装置提出更高的要求。以电子式电流互感器为代表的可靠的、新型的高精度电流互感器已成为发展的主流。有源的电子式电流互感器的结构简单、主要应用较为成熟的技术，是目前实用性强的一种产品。但高电位侧电路功能问题仍需深入研究，特别是对国内外有源电子式电流互感器的功...     

HCN Laser Interferometer on the EAST Superconducting Tokamak

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.     

HT—7弹丸注入器的现场控制系统

主要介绍用于HT－7托卡马克装置用的弹丸注入器的现场控制系统、及其各个组成部分的电路原理和它们所提供的远程控制接口;同时介绍了台面实验结果,拍摄到了飞行中的弹丸照片、测量出弹丸注入装置前的速度,摸索到用于HT－7装置用的氘丸注入的成冰工艺;通过多次实验证实该控制系统是可靠稳定的。     

Multi-channel FIR Interferometer for Electron Density Measurement on HT-7 Superconducting Tokamak

1. IntroductionHigh-density plasma are of interest in thermonuclear fusion research. Fusion plasma density canbe measured by FIR laser and submillimeter waveinterferometer [l]. Plasma are transparent as longas the plasma frequency wp is smaller than the frequency w of the probe wave. The index of refractionof a medium is easily measurable by using electromagnetic waves for which the medium is transparent [l,21. The values of tile index of refraction, po,correspond to a polarized wave with it…