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Using Poloidal Flux as Feedback Control Signal for Injected Power of LHCD in Long Pulse Discharge on ht-7 tokamak

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Plasma Science and Technology 2006年第4期8卷 385-389页

作者：沈飙徐捍东 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

Long pulse discharge is one of the important goals of ht-7 superconducting tokamak experiments. For ITER （International Thermonuclear Experimental Reactor） or a tokamak reactor, carrying out a steady operation is one of the main techniques. For long pulse discharges on ht-7 the poloidal flux is used as the feedback signal to control the injected power of LHCD （Low Hybrid Current Drive） system. Experimental results are presented.

关键词： poloidal flux ht-7 tokamak long pulse discharge feedback control

Measurement of Magnetic Island Width by Multi-Channel ECE Radiometer on ht-7 tokamak

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Plasma Science and Technology 2013年第3期15卷 217-220页

作者：韩翔凌必利高翔刘永提昂李二众徐立清王嵎民 Institute of Plasma Physics Chinese Academy of Sciences

A 16-channel electron cyclotron emission （ECE） radiometer has been employed to observe the （m, n） = （2, 1） magnetic island structure on ht-7 tokamak, where m and n represent the poloidal and toroidal mode number respectively. The results indicate that the island width is about 7 cm when the magnetic island is saturated during the m/n = 2/1 mode. The location of resonance surface can be determined by plotting the contour of ECE relative fluctuation. This method could be applied to the ht-7 and EAST campaigns in the future for the research of neoclassical tearing modes （NTMs）.

关键词： magnetic island width ECE fluctuation ht-7 tokamak

Observation of Lower Hybrid Current Drive Improved Confinement With a Graphite Probe at the Last Closed Flux Surface of the ht—7 tokamak

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Chinese Physics Letters 2002年第9期19卷 1316-1318页

作者：徐国盛万宝年等 InstituteofPlasmaPhysics ChineseAcademyofSciencesHefei230031

High time resolution measurements of the electrostatic fluctuations, radial electric field Er and turbulence-induced electron flux Γe have been performed across the transition of lower hybrid current drive improved confinement with a graphite Langmuir probe array at the last closed flux surface of the ht-7 tokamak. The decrease of Γe is dominated by the suppression of fluctuation levels, which follows the change of Er. A reversal of the poloidal propagation direction of turbulence demonstrates that the poloidal propagation is dominated by Er×Bφ drift. The enhancement of poloidal coherence accompanies the fluctuation suppression, which suggests the subtle variation of turbulence features.

关键词： Turbulent Flow MAGNETIC SURFACES graphene Graphite flux current drive tokamak devices Hybrid electric vehicles ht-7 tokamak Probes HYBRID Suppression propagation direction

Exposure of W-TiC/Cu Functionally Graded Materials in the Edge Plasma of ht-7 tokamak

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Plasma Science and Technology 2012年第2期14卷 177-180页

作者：刘洋朱大焕陈俊凌周张健鄢容 Institute of Plasma Physics Chinese Academy of Sciences University of Science and Technology Beijing

Six-layered W-TiC/Cu functionally graded materials were fabricated by resistance sintering under ultra-high pressure and exposed in the edge plasma of ht-7 tokamak. Microstruc- ture morphologies show that the TiC particles distribute homogeneously in the W matrix, strength- ening the grain boundary, while gradient layers provide a good compositional transition from W- TiC to Cu. After about 360 shots in the ht-7 tokamak, clear surface modification can be observed after plasma exposure, and the addition of nano TiC particles is beneficial to the improvement of plasma loads resistance of W.

关键词： W-TiC resistance sintering ht-7 tokamak plasma exposure

Design of Amplifier Circuit for the ht-7 tokamak Thomson Scattering System

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Plasma Science and Technology 2008年第6期10卷 775-778页

作者：史灵卫凌必利赵君煜杨利臧庆胡庆生贾燕庆 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

Thomson scattering diagnostic is important for measuring electron temperature and density profiles. To improve the signal-to-noise ratio, a silicon avalanche photodiode （APD） with high quantum efficiency, high sensitivity, and high gain up to 100 was adopted to measure the Thomson scattering spectrum. A preamplifier, which has low noise, high bandwidth, and high sensitivity, was designed with suitable transimpedance. Using AD8367 as the post-amplifier, good performance of the APD readout electronics have been obtained. A discussion is presented on the performance of the amplifier using a laser diode to simulate the Thomson scattering light. The test results indicate that the designed circuit has a high amplifying factor and fast rising edge. So reduction of the integral gate of the CAMAC ADC converter can improve the signal-to-noise ratio.

关键词： ht-7 tokamak Thomson scattering preamplifier

Modification of Boundary Fluctuations by LHCD in the ht—7 tokamak

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Chinese Physics Letters 2003年第6期20卷 865-868页

作者： SONGMei WANBao-Nian XUGuo-Sheng LINGBi-Li InstituteofPlasmaPhysics ChineseAcademyofSciencesPOBox1126Hefei230031

Measurements of boundary fluctuations and fluctuation driven electron fluxes have been performed in ohmic and lower hybrid current drive enhanced confinement plasma using a graphite Langmuir probe array on ht-7 tokamak. The fluctuations are significantly suppressed and the turbulent fluxes are remarkably depressed in the enhanced plasma. We characterized the statistical properties of fluctuations and the particle flux and found a non-Gaussian character in the whole scrape-off layer with minimum deviations from Gaussian in the proximity of the velocity shear layer in ohmic plasma. In the enhanced plasma the deviations in the boundary region are all reduces obviously. The fluctuations and induced electron fluxes show sporadic bursts asymmetric in time and the asymmetry is remarkably weakened in the lower hybrid current driving (LHCD) phase. The results suggest a coupling between the statistical behaviour of fluctuations and the turbulent flow.

关键词： Ohmic current drive ht-7 tokamak boundary regions Particle Flux Turbulent Flow Non-Gaussian fluctuations SHEAR VELOCITY tokamak devices Electron Flux MODIFICATION

Measurements of Boundary Plasma in Synergy Discharges of IBW and LHCD on the ht-7 tokamak

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Chinese Physics Letters 2003年第10期20卷 1781-1784页

作者：宋梅万宝年徐国盛陈忠勇刘海庆凌必利李成富 InstituteofPlasmaPhysics ChineseAcademyofSciencesPOBox1126Hefei230031

By applying ion Bernstein wave (IBW) heating into the lower hybrid current drive (LHCD) plasma, improved confinements have been obtained in the ht-7 tokamak. The central electron temperature was doubled and the storage energy was increased significantly. The core electron density and temperature were broadened and their profiles near the edge were steepened. A transport barrier has been formed in the vicinity of the limiter radial location. An enhanced shear in poloidal phase velocity was found in the same region with reduction of the fluctuation levels and the coherences between fluctuations. The results suggest that the improved confinement in the IBW and LHCD plasma is at least partially due to the modification of shear in poloidal velocity and then the suppression of fluctuations and fluctuation induced fluxes via de-correlation effect.

关键词： Confinement Plasmas Electron density energy storage ht-7 tokamak Shear phase velocity fluctuations tokamak devices Synergism electron temperature

The Compression Algorithm for the Data Acquisition System in ht-7 tokamak

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Plasma Science and Technology 2003年第5期5卷 1939-1944页

作者：朱琳罗家融李贵明岳冬利 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

ht-7 superconducting tokamak in the Institute of Plasma Physics of the Chinese Academy of Sciences is an experimental device for fusion research in China. The main task of the data acquisition system of ht-7 is to acquire, store, analyze and index the data. The volume of the data is nearly up to hundreds of million bytes. Besides the hardware and software support, a great capacity of data storage, process and transfer is a more important problem. To deal with this problem, the key technology is data compression algorithm. In the paper, the data format in ht-7 is introduced first, then the data compression algorithm, LZO, being a kind of portable lossless data compression algorithm with ANSI C, is analyzed. This compression algorithm, which fits well with the data acquisition and distribution in the nuclear fusion experiment, offers a pretty fast compression and extremely fast decompression. At last the performance evaluation of LZO application in ht-7 is given.

关键词： data compression algorithm ht-7 tokamak

Multipulse Nd:YAG Laser Thomson Scattering Diagnostics on ht-7 tokamak

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Plasma Science and Technology 2008年第1期10卷 13-17页

作者：臧庆赵君煜运高谦史录卫许雅劼 Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China

A multipulse Nd：YAG （Neodym-yttrium aluminium garnet） laser Thomson scattering diagnostic system developed was recently applied on ht-7 tokamak to obtain more accurate electron temperatures. A CAMAC-based real-time computer system for laser control, data acquisition, analysis and calibration was investigated in detail. Furthermore, the reliability and accuracy of this diagnostic system were demonstrated by comparing the results with those of a soft-X ray diagnostic system.

关键词： multipulse Nd:YAG laser Thomson scattering ht-7 tokamak electron temperature