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Preliminary Investigation of Impurity and Radiation Behaviors in the Startup Phase of HL-2A Tokamak 被引量:1
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作者 LI Wei PAN Yudong CUI Zhengying LUO Junlin DONG Jiafu 《Southwestern Institute of Physics Annual Report》 2004年第1期20-21,共2页
As the startup phase of HL-2A operation and the first divertor tokamak device in China, it is important to identify the species of impurity, estimate the concentration of impurities and compare the different behaviors... As the startup phase of HL-2A operation and the first divertor tokamak device in China, it is important to identify the species of impurity, estimate the concentration of impurities and compare the different behaviors of radiation in limiter and divertor configurationt. In startup phase of HL-2A, glowing discharge cleaning (GDC) is used as a conventional wall conditioning technology and titanium gettering is used occasionally in closed divertor chamber during SN configuration discharges phase. 展开更多
关键词 IMPURITY RADIATION Wall conditioning
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The Introduction to the ECRH System of the HL-2A Tokamak 被引量:1
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作者 RAO Jun KANG Zhihua ZHOU Jun WANG Mingwei LU Zhihong LI Xiujuan 《Southwestern Institute of Physics Annual Report》 2004年第1期58-61,共4页
The 1 MW/68 GHz/1 s ECRH system of HL-2A device is being designed or fabricated. The O mode wave beams are injected into plasma from low field side of the HL-2A tokomak. Because the EC wave can heat plasma locally, it... The 1 MW/68 GHz/1 s ECRH system of HL-2A device is being designed or fabricated. The O mode wave beams are injected into plasma from low field side of the HL-2A tokomak. Because the EC wave can heat plasma locally, it is a very versatile scheme which has been employed to heating, current drive, profile control, confinement improvement. Up to now, the basic physical and engineering parameters of the whole system have been fixed and the subsystems are being designed or fabricated. 展开更多
关键词 ECRH GYROTRON
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Silicon Drift Detector for Soft x-ray Spectrometer in Fusion Plasmas
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作者 LI Mei JU Hong-jun 《Semiconductor Photonics and Technology》 CAS 2008年第2期124-126,142,共4页
Silicon drift detector(SDD) is used in the soft x-ray pulse height analyzer(PHA) to measure soft x-ray emissions in fusion plasmas. SDD has the virtues of high count rates and high energy resolution, and the good perf... Silicon drift detector(SDD) is used in the soft x-ray pulse height analyzer(PHA) to measure soft x-ray emissions in fusion plasmas. SDD has the virtues of high count rates and high energy resolution, and the good performances at work temperature of about -10 ℃ achieved by single stage peltier element. The performance and first experimental results from SDD system are presented. 展开更多
关键词 SDD PHA TOKAMAK
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The ECRH Transmission System for HL-2A Tokamak 被引量:1
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作者 ZHOU Jun RAO Jun CHEN Gangyu ZHANG Jinsong SONG Shaodong LU Zhihong LEI Jianxin HUANG Mei 《Southwestern Institute of Physics Annual Report》 2005年第1期54-55,共2页
Electron cyclotron resonance heating and electron cyclotron current drive ( ECRH/ECCD ) have been developed significantly in recent years in many devices such as Tore Supra, JT-60U, Heliotron J. It has many advantag... Electron cyclotron resonance heating and electron cyclotron current drive ( ECRH/ECCD ) have been developed significantly in recent years in many devices such as Tore Supra, JT-60U, Heliotron J. It has many advantages over other means of heating and current drive. The EC power can be injected as narrow gaussian beams, giving rise to so highly localized power deposition as to make ECRH an ideal candidate for local MHD control. 展开更多
关键词 ECRH Transmission system
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Study of the Protection System for LHCD on the HL-2A Tokamak
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作者 LI Xiujuan WANG Mingwei SONG Shaodong 《Southwestern Institute of Physics Annual Report》 2004年第1期70-73,共4页
LHCD experiment has been carried through in HL-1M tokamak since 1995, and the work is successful. This years the LHCD experiment would go ahead on the HL-2A tokamak that had been improved from HL-1M system.
关键词 ARC Body-current OVER-CURRENT
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The Study of Fueling Method and Particle Confinement Improvement
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作者 ZHOU Yan DENG Zhongchao YAO Lianghua XIAO Zhenggui DING Xuantong LIU Yong WANG Enyao 《Southwestern Institute of Physics Annual Report》 2004年第1期14-16,共3页
Several high performance tokamak operation regimes have been achieved experimentally in the experiments with the peaked density profiles. The regimes include the improved Ohmic confinement in ASDEX, the pellet enhance... Several high performance tokamak operation regimes have been achieved experimentally in the experiments with the peaked density profiles. The regimes include the improved Ohmic confinement in ASDEX, the pellet enhanced performance mode in Alcator-C, and the super-shot mode in TFTR. In these regimes, peaked core density profiles are always existent, and almost always go with the internal transport barriers, these barriers generally produced by sheared radial electric field. In addition to enhance confinement, the peaked density profile is also needed for the optimized fusion reaction rate and alpha heating power in tokamak plasma, and combined peaked density profile and peaked temperature profile, would make the ignition condition easy obtained. It is desirable to seek and analyze the density profile control schemes that effectively lead to density profile peaking in particle transports experimental investigation. 展开更多
关键词 Particle confinement Density profile behavior Fueling method
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Observations of High Densitly Disruption on HL-2A Tokamak
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作者 YANG Qingwei DING Xuantong SHI Zhongbing PAN Yudong CAO Zeng ZHOU Yian LIU Yi CUI Zhengying LI Wei FENG Beibin ZHOU Hangyu 《Southwestern Institute of Physics Annual Report》 2004年第1期4-6,共3页
When the major disruption occurs, it can not only generate great heat loads on the first wall and divertor plates, but also leads to the large electromagnetic force because of the halo current. This large electromagne... When the major disruption occurs, it can not only generate great heat loads on the first wall and divertor plates, but also leads to the large electromagnetic force because of the halo current. This large electromagnetic force is very dangerous to the invessel components of the divertor and vacuum vessel. Therefore, how to avoid the disruption is an important issue on tokamak operation. To control and mitigate the major disruptions, the mechanism and the characters of the disruption have to be well understood. 展开更多
关键词 DISRUPTION Density limit
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Installation and Primary Results of a Neutral Particle Analyzer on HL-2A Tokamak
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作者 ZHONG Guangwu LU Jie YI Pin YU Deliang 《Southwestern Institute of Physics Annual Report》 2004年第1期16-20,共5页
The target of nuclear fusion research is to realize effective and sustainable fusion reaction of hydrogen isotope ions and to get the thermonuclear energy economically. Naturally the parameters of plasma ions are of... The target of nuclear fusion research is to realize effective and sustainable fusion reaction of hydrogen isotope ions and to get the thermonuclear energy economically. Naturally the parameters of plasma ions are of importance and measurement of the parameters of ions has been an essential concern to the nuclear fusion research work since 1950s. However, the ions are confined by the mag- netic field, one can measure the neutral particles emitting from the plasma to obtain the parameters of ions. The diagnosing of neutral particles is a method by measuring the neutral particles from the plasma to obtain the information (such as energy) of ions, and it is important and foundational to the experi ments as well. 展开更多
关键词 NPA INSTALLATION Ion temperature
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Numerical Study of Kinetic Shear Alfvén Instability in Tokamak Plasmas
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作者 JIAN Guangde DONG Jiaqi 《Southwestern Institute of Physics Annual Report》 2004年第1期124-129,共6页
In a tokamak plasma, shear Alfvén waves (SAWs) are generally characterized by a continuous spectrum with gaps, due topoloidal symmetry breaking. For low frequencies, |ω|〈〈|ωA|=νA/qR, it has been shown ... In a tokamak plasma, shear Alfvén waves (SAWs) are generally characterized by a continuous spectrum with gaps, due topoloidal symmetry breaking. For low frequencies, |ω|〈〈|ωA|=νA/qR, it has been shown that the SAW continuum can becomeunstable due to finite ion temperature gradient. Here, νA is the Alfvén speed, q and R are the safety factor and the major radius of the flux surface, respectively. Recently, it has been shown, with the multiple scale asymptotic technique, that discrete modes may exist in an unstable shear Alfvén continuous spectrum, due to finite ion Larmor radius (FLR) and finite drift-orbit width (FOW) effects in tokamak plasmas which are stable with respect to ideal magnetohydrodynamic (MHD) instabilities . 展开更多
关键词 Kinetic shear Alfvén modes The new integral transformation Critical gradient
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Multi-Channel FIR Laser Interferometer on the HL-2A Tokamak
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作者 DENG Zhongchao ZHOU Yan TANG Yiwu YI Jiang 《Southwestern Institute of Physics Annual Report》 2004年第1期28-30,共3页
In recent years, the high density plasma in the range of 10^19~ 10^20m^-3 have been operated in large or middle tokamak device in the world. A muhichannel far infrared interferometer for profile measurement of plasma... In recent years, the high density plasma in the range of 10^19~ 10^20m^-3 have been operated in large or middle tokamak device in the world. A muhichannel far infrared interferometer for profile measurement of plasma density on HL-2A divertor tokamak is being developed, however the design of the interferometer will appear many new problem in face of experimental environment of the HL-2A divertor device, such as how to make both transmission and arrangement of optics of the interferometer, the effect of electromo- tive force on device and how about the vibration etc. According to the eight windows setting on the largest flange of the device we have to design a Michelson-type FIR laser interferometer with 8 probing channels and eight concave mirrors must be attached it to the inner wall of the vacuum vessel of the device. Therefore, there are many problems should be taken into account to resolve, for example, ( 1 ) the vibration-proof consider for muhichannel interferometer and HCN laser, (2) the stabilization and reliability of the mirror frame uum vessel, the mirrors, hanging on internal wall of vachow to prevent the sputtering to (3) the vacuum seal of the windows and the design of mobile seal for the shutter to avoid the sputter coating of plasma, 展开更多
关键词 Electron density Beat-frequency interferometer HCN waveguide laser
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The First Results of Supersonic Molecular Beam Injection in the HL-2A Tokamak
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作者 YAO Lianghua FENG Beibin CHEN Chengyuan SHI Zhongbing 《Southwestern Institute of Physics Annual Report》 2004年第1期25-27,共3页
HL-2A tokamak, the first tokamak with divertor in China, has been constructed and put into operation in 2002. The main parameters are R=1.65 m, a=0.4 m, BT=2.8 T, Ip = 0. 48 MA. The divertor of HL-2A is unique, becaus... HL-2A tokamak, the first tokamak with divertor in China, has been constructed and put into operation in 2002. The main parameters are R=1.65 m, a=0.4 m, BT=2.8 T, Ip = 0. 48 MA. The divertor of HL-2A is unique, because it is characterized with a large closed divertor chamber. The device has double divertor chamber, but now it is operating with lower single null configuration to study the physics of divertor for the next step design of a divertor. Supersonic molecular beam injection (SMBI) system with LN2 cooling trap was first installed and demonstrated on the HL-2A tokamak in 2004. The first results of SMBI into HL-2A plasma are to demonstrate the function of the HL-2A divertor and to observe the cold pulse propagation during multi-pulse SMBI on HL-2A Tokamak. 展开更多
关键词 Supersonic molecular beam injection Divetor LIMITER
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Control of LHCD on the HL-2A Tokamak
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作者 WANG Mingwei LI Bo FENG Kun RAO Jun KANG Zihua LI Xiujuan LILi WANG Minghong FAN Mingjie 《Southwestern Institute of Physics Annual Report》 2004年第1期77-79,共3页
in order to study non-indutive plasma current production, the lower hybrid current drive(LHCD) experiment on the HL-2A tokamak is carried out. Simultaneously a microcomputer has been used to control the whole LHCD s... in order to study non-indutive plasma current production, the lower hybrid current drive(LHCD) experiment on the HL-2A tokamak is carried out. Simultaneously a microcomputer has been used to control the whole LHCD system. During the experiment this year, we can monitor and protect the LHCD system by use of the microcomputer control system, which will imediately switch off the microwave power to be launched into the tokamak if the plasma is disrupted. All this ensure that the microwave is injected into the equipment correctly. 展开更多
关键词 Microcomputer control LHCD
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Simple Emission Model of Supersonic Molecular Beam
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作者 ZHENG Yinjia SHI Le SUN Ping 《Southwestern Institute of Physics Annual Report》 2004年第1期36-39,共4页
Recently some modes of supersonic molecular beam injection (SMBI)have been put forward. Among them there are electrostatic “double layer”-shielding, simple collective and optimized numerical models to explain the ... Recently some modes of supersonic molecular beam injection (SMBI)have been put forward. Among them there are electrostatic “double layer”-shielding, simple collective and optimized numerical models to explain the experiment phenomenon. The penetrated depth A and particle deposition were calculated theoretically. About 1/7 in- cident thermal electron flux was amputated and, A increased seven times. The previous simulation is not enough for the SMBI fueling mechanism research. Hence, further investigations, both in experiment and in theory should be developed. The phenomena of line emission due to supersonic molecular beam (SMB) are of particular importance. 展开更多
关键词 Supersonic molecular beam Penetration dept Simple emission model
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Scaling Law of Runaway Electrons in HL-1M Tokamak
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作者 ZHENG Yongzhen 《Southwestern Institute of Physics Annual Report》 2004年第1期135-137,共3页
Runaway electrons in tokamaks have been widely studied theoretically and experimentally. The runaway confinement time τr in ohmic and additionally heated tokamak plasmas presents an anomalous behavior compared with t... Runaway electrons in tokamaks have been widely studied theoretically and experimentally. The runaway confinement time τr in ohmic and additionally heated tokamak plasmas presents an anomalous behavior compared with theoretical predictions based on neoclassical models. A one-dimensional numerical model including generation, acceleration and loss effect of runaway electrons is used to deduce the runaway energy εr dependence on the runaway confinement time. 展开更多
关键词 Runaway energy Runaway confinement time Runaway electron diffusivity
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Hα Emission Imaging during Supersonic Molecular Beam Injection by CCD Photograph
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作者 ZHENG Yinjia SHI Le LI Guohui CHEN Chengyuan LUO Cuiwen 《Southwestern Institute of Physics Annual Report》 2004年第1期39-43,共5页
There are several fuelling methods for tokamak plasma: pellet injection (PI), gas puffing (GP), neutral beam injection (NBI) and supersonic molecular beam injection (SMBI) .SMBI has been created in the Southw... There are several fuelling methods for tokamak plasma: pellet injection (PI), gas puffing (GP), neutral beam injection (NBI) and supersonic molecular beam injection (SMBI) .SMBI has been created in the Southwestern Institute of Physics, China. 展开更多
关键词 SMB line CCD photograph
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The Effect of Siliconization on Impurity Emission on HL-2A Tokamak
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作者 CUI Zhengying SUN Ping PAN Yudong LI Wei WANG Quanming CAO Zeng LIU Dequan WANG Mingxu 《Southwestern Institute of Physics Annual Report》 2004年第1期8-10,共3页
HL-2A is a new middle-sized tokamak device with two closed divertors. In 2004 campaign siliconization as a wall condition has been first done on HL-2A since the starting operation of the device. By using sil-iconizati... HL-2A is a new middle-sized tokamak device with two closed divertors. In 2004 campaign siliconization as a wall condition has been first done on HL-2A since the starting operation of the device. By using sil-iconization we observed that impurity has been obviously decreased. The character of the siliconization and the effect of wall condition on plasma have been investigated as well as on the wall recycling. 展开更多
关键词 Siliconization Impurity emission
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Observations of Runaway Electron Generation during Disruptions on HL-2A Tokamak
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作者 YANG Qingwei YANG Jinwei SONG Xianying CUI Zhengying LI Wei ZHOU Hangyu DING Xuantong 《Southwestern Institute of Physics Annual Report》 2004年第1期6-8,共3页
The major disruption can not only lead to the great heat loads and produce the large electromagnetic force on the first wall and divertor plates, but also can generate the runaway electrons. The runaway electrongenera... The major disruption can not only lead to the great heat loads and produce the large electromagnetic force on the first wall and divertor plates, but also can generate the runaway electrons. The runaway electrongeneration is a dangerous event for tokamak operation. 展开更多
关键词 Runaway electron DISRUPTION
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Development of Vacuum Monitoring System in the HL-2A tokamak
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作者 GAO Xiaoyan CAI Xiao CAO Zeng CUI Chenghe 《Southwestern Institute of Physics Annual Report》 2004年第1期54-56,共3页
HL-2A is the first divertor tokamak in China. The vacuum system is one of the important parts of the HL-2A tokamak, which has to be work well during the physics campaign in 2004. As the tokamak machine is separated fr... HL-2A is the first divertor tokamak in China. The vacuum system is one of the important parts of the HL-2A tokamak, which has to be work well during the physics campaign in 2004. As the tokamak machine is separated from the operation staff during discharges, to guarantee the safe and reliable operation of the vacuum system, it is necessary to watch the vacuum system outside the machine hall with an automatic monitoring system. The paper describes the design and manufacture of the monitoring system. 展开更多
关键词 Vacuum system MONITOR
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The Analysis of the Spurious Field about HL-2A Tokamak
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作者 SONG Shaodong LI Guangsheng LIU Yong 《Southwestern Institute of Physics Annual Report》 2004年第1期67-69,共3页
To better the shielding of outer magnetic field when making the experiment on neutral particle measurement and neutral beam injection outside of HL-2A, it would be necessary to determine the distribution of outer magn... To better the shielding of outer magnetic field when making the experiment on neutral particle measurement and neutral beam injection outside of HL-2A, it would be necessary to determine the distribution of outer magnetic field, which the excitation coils inducet. This experiment is done to measure and analyze the spurious field. 展开更多
关键词 Spurious field Excitation coils
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Phenomena of the Cold Pulse Propagation during Pulsed Molecular Beam Injection
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作者 SHI Zhongbing DING Xuantong YAO Lianghua LIU Zetian CHEN Chengyuan YANG Qingwei FENG Beibin ZHOU Yan YAN Longwen LIU Yi LIU Yong 《Southwestern Institute of Physics Annual Report》 2004年第1期43-47,共5页
As an advanced fuelling method on tokamak, molecular beam injection (MBI) has successfully been developed in HL-1M firstly and applied to HL-2A later. Many advantages such as peaked density profile and the energy co... As an advanced fuelling method on tokamak, molecular beam injection (MBI) has successfully been developed in HL-1M firstly and applied to HL-2A later. Many advantages such as peaked density profile and the energy confinement time increasing have been found in the MBI experiments. Some interesting phenomena have been observed in the previous MBI experiments. But up to now the mechanism of the MBI seems not very clear. 展开更多
关键词 MBI Cold pulse
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