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—6M和HT—7托卡马克的多发靶丸注入试验研究

最大发射能力为８ 发的多发 “原位” 靶丸注入装置已在中科院等离子体所建成。在 Ｈ Ｔ－ ７ ,中国第一座超导托卡马克和 Ｈ Ｔ－ ６ Ｍ 上进行了单发及多发试验。其差分单元及控制单元稳定可靠, 试验中测量了靶丸的尺寸和速度, 观察到显著而典型的物理现象, 实现了深度加料。加料效果显著,在单发靶丸注入时中心弦平均密度增长约５０ ％ ,双发注入时约１００ ％ 。实验中也观察到了明显的电子温度中空分布。文章介绍了系统的结构及操作,给出了实验现象及初步的物理分析结果。     

Soft X-ray Tomography and Sawtooth Oscillations during IBW in HT-7 Tokamak

1. IntroductionA number of plasma diagnostic8 cou1d provide line-integrated measurements, from which an inversiontechnique is required to reconstruct plasma images.When the plasma image is cylindrically synunetricor uP-down symmetric, the AbeI inversion is usedto obtain the radial distribution. However, in manycases the distribution is asyrnmetric. A kind of com-puted tomograPhy has become necessary to obtainthe plasma image. Soft xray tomography is a u8e-ful technique for observing the mode…     

UMTS无线网络规模估算中应用Campbell定理的局限性

详细论述了用Campbell定理进行UMTS无线网络规模估算的局限性，分析指出PS域业务占有较大比例时，该方法估算的结果会和实际网络需求有出入。     

Edge Plasma behavior during Improved Confinement by Lower Hybrid Wave heating in HT—6M Tokamak

Lower hybrid heating (LHH) has been successfully carried out in the HT-6M tokamak.The H-mode has been obtained with a power threshold of 50kW under a boronized wall condition.Both energy and particle confinements have been improved along with a dropped edge plasma density and an increase electron temperature during the LHH phase.A negative Er well plays a key role of triggering and sustaining the good confinement.Both electrostatic fluctuation of the plasma potential and the density fluctuations dropped to an ultra-low level.The observation of an enhanced Er shear before the reduction in turbulence level is consistent with an increased Er shear as the cause of turbulence suppression.