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R&D progress of high power ion source on EAST-NBI

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Plasma Science and Technology 2018年第1期20卷 158-161页

作者：谢亚红胡纯栋刘胜谢远来许永建梁立振蒋才超盛鹏顾玉明李军刘智民 Institute of Plasma Physics Chinese Academy of Sciences

The neutral beam injector （NBI） system was designed and developed mainly for the plasma heating on the Experimental Advanced Superconducting Tokamak （EAST）. The high power ion source is the key part of the NBI. A hot cathode ion source was used on the EAST-NBI. The ion source was conditioned on the ion source test bed with hydrogen gas and achieved the designed parameters. The deuterium gas was used when it moved to the EAST-NBI. The main performance of the ion source on EAST is presented in this paper. The highest beam power of 4.5 MW in NBI-1 and 2.75 MW in NBI-2 was achieved. The total neutral beam power is about 4.5 MW. The long pulse beam of 100 s is injected into the EAST plasma too.

关键词： ion source neutral beam injector EAST toakmak

Diagnosing the Fine Structure of Electron Energy Within the ECRIT ion source

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Plasma Science and Technology 2016年第7期18卷 744-750页

作者：金逸舟杨涓汤明杰罗立涛冯冰冰 College of Astronautics Northwestern Polytechnic University

The ion source of the electron cyclotron resonance ion thruster （ECRIT） extracts ions from its ECR plasma to generate thrust, and has the property of low gas consumption （2 seem, standard-state cubic centimeter per minute） and high durability. Due to the indispensable effects of the primary electron in gas discharge, it is important to experimentally clarify the electron energy structure within the ion source of the ECRIT through analyzing the electron energy distribution function （EEDF） of the plasma inside the thruster. In this article the Langmuir probe diagnosing method was used to diagnose the EEDF, from which the effective electron temperature, plasma density and the electron energy probability function （EEPF） were deduced. The experimental results show that the magnetic field influences the curves of EEDF and EEPF and make the effective plasma parameter nonuniform. The diagnosed electron temperature and density from sample points increased from 4 eV/2 ×10^16 m-3 to 10 eV/4×10^16 m-3 with increasing distances from both the axis and the screen grid of the ion source. Electron temperature and density peaking near the wall coincided with the discharge process. However, a double Maxwellian electron distribution was unexpectedly observed at the position near the axis of the ion source and about 30 mm from the screen grid. Besides, the double Maxwellian electron distribution was more likely to emerge at high power and a low gas flow rate. These phenomena were believed to relate to the arrangements of the gas inlets and the magnetic field where the double Maxwellian electron distribution exits. The results of this research may enhance the understanding of the plasma generation process in the ion source of this type and help to improve its performance.

关键词： ion source plasma diagnostic electron energy distribution function

Interaction between plasma and electromagnetic field in ion source of 10 cm ECR ion thruster

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Chinese Physics B 2022年第7期31卷 404-412页

作者：牟浩金逸舟杨涓夏旭付瑜亮 College of Astronautics Northwestern Polytechnical UniversityXi’an 710072China Shanghai Institute of Space Electric Propulsion Shanghai 200000China

Through diagnosing the plasma density and calculating the intensity of microwave electric field,four 10 cm electron cyclotron resonance(ECR)ion sources with different magnetic field structures are studied to reveal the inside interaction between the plasma,magnetic field and microwave electric field.From the diagnosing result it can be found that the plasma density distribution is controlled by the plasma generation and electron loss volumes associated with the magnetic field and microwave power level.Based on the cold plasma hypothesis and diagnosing result,the microwave electric field intensity distribution in the plasma is calculated.The result shows that the plasma will significantly change the distribution of the microwave electric field intensity to form a bow shape.From the boundary region of the shape to the center,the electric field intensity varies from higher to lower and the diagnosed density inversely changes.If the bow and its inside lower electric field intensity region are close to the screen grid,the performance of ion beam extracting will be better.The study can provide useful information for the creating of 10 cm ECR ion source and understanding its mechanism.

关键词： electron cyclotron resonance plasma plasma diagnosing ion source

Performance of a New ion source for KSTAR Tokamak Plasma Heating

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Plasma Science and Technology 2014年第6期16卷 620-624页

作者： Tae-Seong KIM Seung Ho JEONG Doo Hee CHANG Kwang Won LEE Sang-Ryul IN Korea Atomic Energy Research Institute

In the experimental campaign of 2010 and 2011 on KSTAR, the NBI-1 system was equipped with one prototype ion source and operated successfully, providing a neutral beam power of 0.7-1.6 MW to the tokamak plasma. The new ion source planned for the 2012 KSTAR campaign had a much more advanced performance compared with the previous one. The target performance of the new ion source was to provide a neutral deuterium beam of 2 MW to the tokamak plasma. The ion source was newly designed, fabricated, and assembled in 2011. The new ion source was then conditioned up to 64 A/100 keV over a 2-hour beam extraction and performance tested at the NB test stand （NBTS） at the Korea Atomic Energy Research Institute （KAERI） in 2012. The measured optimum perveance at which the beam divergence is a minimum was about 2.5μP, and the minimum beam divergent angle was under 1.0° at 60 keV. These results indicate that the 2.0 MW neutral beam power at 100 keV required for the heating of plasma in KSTAR can be delivered by the installation of the new ion source in the KSTAR NBI-1 system.

关键词： NBI ion source KSTAR neutral beam plasma heating positive based ion

The Arc Regulation Characteristics of the High-Current ion source for the EAST Neutral Beam Injector

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Plasma Science and Technology 2014年第4期16卷 429-432页

作者：谢亚红胡纯栋刘胜蒋才超梁立振李军谢远来刘智民 Institute of Plasma Physics Chinese Academy of Sciences

The arc regulation method is applied to the high-current ion source for high-power hydrogen ion beam extraction for the first time. The characteristics of the arc and beam, including the probe ion saturation current, the arc power and the beam current, are studied with feedback control. The results show that the arc regulation method can be successfully applied to ion beam extraction. This lays a sound foundation for the testing of a new ion source and the operation of a conditioned ion source for neutral beam injector devices.

关键词： ion source arc regulation ion saturation current beam extraction

The Development of a Megawatt-Level High Current ion source

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Plasma Science and Technology 2012年第1期14卷 75-77页

作者：胡纯栋谢亚红 NBI team NBI team Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

Neutral beam injection is one of the main plasma heating methods in nuclear fusion devices. In order to support the scientific study of the Experimental Advanced Superconducting Tokamak （EAST）, a megawatt-level high current ion source is designed and manufactured in the ASIPP, and the progress and preliminary test results will be presented in this paper.

关键词： NBI ion source megawatt high current

Optimization of Experimental Discharge Parameters to Increase the Arc Efficiency of the Bucket ion source

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Chinese Physics Letters 2010年第5期27卷 72-75页

作者：于利明雷光玖曹建勇钟光武姜韶风邹桂清江涛卢大伦张贤明刘鹤 Southwestern Institute of Physics Chengdu 610041

Arc efficiency is a critical criterion for assessing the performance of the ion source. High are efficiency is necessary for a high power ion source, because it can decrease the load of the arc power supply. Thus the relationship between the discharge parameters （gas pressure, arc voltage, filament current, bias resistance connecting between the anode and plasma grid） and the arc efficiency is investigated in experiment especially. It is found that with increasing pressure, the arc efficiency increases fast if the pressure is below 0.4 Pa, but when it is above 0.4 Pa, the arc efficiency remains unchanged or increases slowly. If we increase the arc voltage or filament current, the arc efficiency decreases. The bias resistance also influences the arc efficiency, at the same pressure the arc efficiency increases with resistance.

关键词： arc efficiency bias efficiency ion source

Analysis of Magnetic Field of the DNB ion source

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Plasma Science and Technology 2008年第4期10卷 522-524页

作者：谢亚红胡纯栋刘胜刘智民王绍虎 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

A distribution of the magnetic field produced by permanent magnets in the DNB ion source is calculated and analyzed in order to understand the plasma confinement in a cusped magnetic field and optimize plasma discharg... 详细信息

关键词： ion source cusped magnetic field confined configuration plasma

Using Adaptive Discrete-Time Gas Supply Control for Long Pulse Arc Discharge of ion source on NBI

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Plasma Science and Technology 2008年第5期10卷 635-639页

作者：盛鹏胡纯栋宋士花刘胜刘智民 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

A control model of gas supply system is introduced for ion source and an adaptive discrete-time control algorithm to regulate the hydrogen injection. A real-time feedback control system （RFCS） is designed to control the gas supply for ion source based on the control model and the discrete-time control algorithm. The experimental results have proved that RFCS could regulate the gas supply smoothly, suppress the arc＇s abrupt over-current at the end of the ion source discharging, prolong the discharge pulse and stabilize the ion concentration. With RFCS, the ion source for neutral beam injection has reached its longest pulse with a length of 4.5 seconds in a stable status.

关键词： adaptive discrete-time control real-time feedback control ion source neutral beam injection