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DENSITY WINDOW FOR CURRENT DRIVE OF LOWER HYBRID WAVE ON HT-6B TOKAMAK
HT-6B托卡马克参数下低杂波驱动电流的密度窗口

XIANG NONG,YU GUO-YANG,
项农
,俞国扬

物理学报 , 1993,
Abstract: By considering the lower hybrid wave trajectory,spectrum variation and power deposition in HT-6B tokamak plasma,we calculated the currents driven with different plasma density. The results show that there exists a density window for lower hybrid wave current drive (LHCD) ,i. e ,LHCD would be achieved only within a certain range of plasma density. The ex-planation of such a density window is given and the parameters option is also discussed.
Runaway electrons behaviors during ion cycolotron range of frequency and lower hybrid wave plasmas in the HT-7 Tokamak
HT-7 Tokamak离子回旋波和低杂波等离子体逃逸电子行为研究

Lu Hong-Wei,Hu Li-Qun,Zhou Rui-Jie,Xu Ping,Zhong Guo-Qiang,Lin Shi-Yao,Wang Shao-Feng,
卢洪伟
,胡立群,周瑞杰,许平,钟国强,林士耀,王少锋

物理学报 , 2010,
Abstract: HT-7 Tokamak is equipped with a lower hybrid wave (LHW) system and an ion cyclotron range of frequency (ICRF) system. ICRF can accelerate ions effectively, while LHW can accelerate electrons effectively. The generation of runaway electrons during the LHW and ICRF plasmas, as well as the time evolution of electron temperature during the ICRF and LHW plasmas was investigated in this paper. The runaway critical energy for runaway electrons was also calculated according to the experimental data. It was observed that the combination of ICRF and LHW can produce a higher heating efficiency and a better coupling between ICRF and plasmas if the power of LHW exceeds a critical value. Therefore, the generation of runaway electrons and fusion neutrons are affected by ICRF.
Fast electron dynamics in lower hybrid current drive experiment on HT-7 tokamak
HT-7托卡马克上低杂波电流驱动实验中的快电子动力学

Shi Yue-Jiang,Wan Bao-Nian,Chen Zhong-Yong,Hu Li-Qun,Lin Shi-Yao,Ruan Huai-Lin,Qian Jin-Ping,Zhen Xiang-Jun,Ding Bo-Jiang,Kuang Guang-Li,Li Jian-Gang,HT- Team,
石跃江
,万宝年,陈忠勇,胡立群,林士耀,阮怀林,钱金平,甄香君,丁伯江,匡光力,李建刚,HT-研究组

中国物理 B , 2005,
Abstract: Dynamic behaviour of fast electron in lower hybrid current drive (LHCD) experiment is a crucial issue in the sense of enhancing plasma performance. A new hard x-ray diagnostic system on HT-7 allows the investigation of the lower hybrid wave dynamics. The behaviour of fast electron is studied in several kinds of LHCD experiments, including long pulse discharges, high performance discharges and counter-LHCD experiments.
AC operation and runaway electron behaviour in HT-7 tokamak

Lu Hong-Wei,Hu Li-Qun,Zhou Rui-Jie,Lin Shi-Yao,Zhong Guo-Qiang,Wang Shao-Feng,Chen Kai-Yun,Xu Ping,ZhangJi-Zong,Ling Bi-Li,Mao Song-Tao,DuanYan-Min,

中国物理 B , 2010,
Abstract: Operation of HT-7 tokamak in a multicycle alternating square wave plasma current regime is reported. A set of AC operation experiments, including LHW heating to enhance plasma ionization during the current transition and current sustainment, is described. The behaviour of runaway electrons is analysed by four HXR detectors tangentially viewing the plasma in the equatorial plane, within energy ranges 0.3--1.2~MeV and 0.3--7~MeV, separately. High energy runaway electrons ($\sim $MeV) are found to circulate predominantly in the opposite direction to the plasma current, while the number of low energy runaway electrons ($\sim $tens to hundreds of keV) circulating along the plasma current is comparable to that in the direction opposite to the plasma current. AC operation with lower hybrid current drive (LHCD) is observed to have an additional benefit of suppressing the runaway electrons if the drop of the loop voltage is large enough.
Experimental study of large power lower hybrid current drive on HT-7 tokamak
HT-7托卡马克大功率低混杂波电流驱动的实验研究

Xu Qiang,Gao Xiang,Shan Jia-Fang,Hu Li-Qun,Zhao Jun-Yu,
徐强
,高翔,单家方,胡立群,赵君煜

物理学报 , 2009,
Abstract: 在HT-7超导托卡马克成功进行了大功率(PLHW=100—800 kW,f=2.45 GHz)低混杂波电流驱动实验.研究了不同入射功率和等离子体密度下的低混杂波电流驱动效率.获得了以平均电子密度增加、氘阿尔法(Dα)线辐射减少为特征的粒子约束改善;粒子约束时间τp增加了约1.5倍.仔细研究了能量约束时间与等离子体密度和低混杂波功率的关系.
A Compound Josephson Junction Coupler for Flux Qubits With Minimal Crosstalk  [PDF]
R. Harris,T. Lanting,A. J. Berkley,J. Johansson,M. W. Johnson,P. Bunyk,E. Ladizinsky,N. Ladizinsky,T. Oh,Siyuan Han
Physics , 2009, DOI: 10.1103/PhysRevB.80.052506
Abstract: An improved tunable coupling element for building networks of coupled rf-SQUID flux qubits has been experimentally demonstrated. This new form of coupler, based upon the compound Josephson junction rf-SQUID, provides a sign and magnitude tunable mutual inductance between qubits with minimal nonlinear crosstalk from the coupler tuning parameter into the qubits. Quantitative agreement is shown between an effective one-dimensional model of the coupler's potential and measurements of the coupler persistent current and susceptibility.
The impurity transport in HT-6M tokamak
HT-6M托卡马克装置杂质输运

Xu Wei,Wan Bao-Nian,Xie Ji-Kang,
徐 伟
,万宝年,谢纪康

物理学报 , 2003,
Abstract: The space-time profile of impurities has been measured with a multichannel visible spectroscopic detect system and UV rotation-mirror system in the HT-6M tokamak. An ideal impurity transport code has been used to simulate impurities (carbon and oxygen) behaviour during the OH discharge. The profiles of impuritie s diffusion and convection coefficient, impurities ion densities in different io nized state, loss power density and effective charge number have been derived. T he impurity behaviour during low-hybrid current drive has also been analyzed, th e results show that the confinement of particles, impurities and energy has been improved, and emission power and effective charge number have been reduced.
HT-7托卡马克LHCD及IBW加热实验中MHD的实时检测及抑制
The MHD Real-Time Detecting and Suppression of in HT-7 Tokamak LHCD and IBW Experiment
 [PDF]

毛剑珊, 罗家融
Modern Physics (MP) , 2012, DOI: 10.12677/mp.2012.22002
Abstract: 在HT-7超导托卡马克成功进行了大功率低混杂波电流驱动(LHCD)及离子伯恩斯坦波(IBW)加热实验。在HT-7超导托卡马克物理实验中,磁流体不稳定性(MHD)是一个重要的研究课题。对于大功率低混杂波电流驱动条件下的高参数长脉冲等离子体,抑制和控制撕裂模不稳定性更为重要。HT-7超导托卡马克实验研究中,成功建成了快速主动反馈监测MHD系统。本文以凌华公司生产的DAQ2010高速采集卡为硬件对象,介绍了HT-7超导托卡马克LHCD和IBW实验中MHD的实时检测反馈系统的研制。
In the experiment of HT-7 superconducting tokamak, the instability of the Magneto-Hydrodynamics (MHD) is an important factor influencing HT-7 long pulse discharge. It is more important for Large power Current drive of lower hybrid wave (LHW) and Ion Berstein Wave (IBW) on HT-7 superconducting tokamak. Usually, we can suppress MHD through the method to modulate LHW and IBW. The method of active feedback modulating LHW and IBW not only can suppress MHD real-timely, but also uninfluence the drive efficiency. Aim at DAQ2010 advanced data acquisi- tion card, this paper introduced the system of the real-time feedback measure for suppressing MHD on LHCD and IBW heating experiment of HT-7 superconducting tokamak.
THE IMPURITY TRANSPORT IN HT-6B TOKAMAK

HUANG RONG,XIE JI-KANG,LI LIN-ZHONG,HE YE-XI,WANG SHU-YA,DENG CHUAN-BAO,LI GUO-XIANG,WEI LE-HAN,QIU LI-JIAN,

中国物理 B , 1993,
Abstract: The quasi-stationary profiles of the impurity ionization stages in HT-6B Tokamak were absolutely determined by monitoring the VUV and visible line emissions. An impurity transport code was set up. The impurity transport coefficients and other parameters about impurities were determined. From the changes of impurity emission profiles, it was concluded that the impurity confinement was improved and the impurity recycling was reduced by the slow magnetic compression along the minor radius. Some characteristics about the impurity transport in this small device are discussed.
Measurements of Reynolds stress and turbulence in the boundary plasma of the HT-7 tokamak
Song Mei,Wan Bao-Nian,Xu Guo-Sheng,
宋梅
,万宝年,徐国盛

中国物理 B , 2004,
Abstract: Measurements of electric field fluctuations, Reynolds stress and poloidal flow have been performed in the boundary region of the HT-7 tokamak using a Langmuir probe array. Sheared radial electric field and poloidal flow have been found in the vicinity of the limiter and the turbulence has been clearly modified in this region. Furthermore, the electrostatic Reynolds stress component shows a radial gradient close to the velocity shear layer location. All results here indicate that the radial gradient of Reynolds stress may play an important role in the driving of poloidal flows in the plasma boundary region.
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