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Characteristics of the pressure profile in the accelerator on the RF negative ion source at ASIPP

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纳米技术与精密工程(英文) 2023年第3期6卷 48-54页

作者： Mingshan Wu Luxiang Xu Yanbo Zhou Lizhen Liang Yelong Zheng School of Fundamental Physics and Mathematical Sciences Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang ProvinceTaiji Laboratory for Gravitational Wave UniverseHangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China University of Chinese Academy of Sciences Beijing 100049China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China

Neutral beam injection(NBI)systems based on negative hydrogen ion sources-rather than the positive ion sources that have typically been used to date-will be used in the future magnetically confined nuclear fusion experiments to heat the *** collisions between the fast negative ions and neutral background gas result in a significant number of high-energy positive ions being produced in the acceleration area,and for the high-power long-pulse operation of NBI systems,this acceleration of positive ions back to the ion source creates heat load and material sputtering on the source *** difficulty cannot be ignored,with the neutral gas density in the acceleration region having a significant impact on the flux density of the backstreaming positive *** the work reported here,the pressure gradient in the acceleration region was estimated using an ionization gauge and a straightforward 1D computation,and it was found that once gas traveled through the acceleration region,the pressure dropped by nearly one order of magnitude,with the largest pressure drop occurring at the plasma *** computation also revealed that the pressure drop in the grid gaps was substantially smaller than that in the grid apertures.

关键词： Pressure gradient negative ion source Aperture conductance Neutral beam injection

Design of the Prototype negative ion source for Neutral Beam Injector at ASIPP

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Plasma Science and Technology 2016年第9期18卷 954-959页

作者：韦江龙谢亚红梁立振顾玉明邑伟李军胡纯栋谢远来蒋才超陶玲盛鹏许永建 Institute of Plasma Physics Chinese Academy of Sciences

In order to support the design, manufacture and commissioning of the negative- ion-based neutral beam injection （NBI） system for the Chinese Fusion Engineering Test Reactor （CFETR）, the Hefei utility negative ion test equipment with RF source （HUNTER） was proposed at ASIPP. A prototype negative ion source will be developed at first. The main bodies of plasma source and accelerator of the prototype negative ion source are similar to that of the ion source for EAST-NBI. But instead of the filament-arc driver, an RF driver is adopted for the prototype negative ion source to fulfill the requirement of long pulse operation. A cesium seeding system and a magnetic filter are added for enhancing the negative ion density near the plasma grid and minimizing co-extracted electrons. Besides, an ITER-like extraction system is applied inside the accelerator, where the negative ion beam is extracted and accelerated up to 50 kV.

关键词： negative ion source neutral beam injection CFETR

Electric Potential in Surface Produced negative ion source with Magnetic Field Increasing Toward a Wall

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Plasma Science and Technology 2013年第3期15卷 266-270页

作者： Azusa FUKANO Akiyoshi HATAYAMA Monozukuri Department Tokyo Metropolitan College of Industrial Technology Faculty of Science and Technology Keio University

Electric potential near a wall for plasma with the surface produced negative ions with magnetic field increasing toward a wall is investigated analytically. The potential profile is derived analytically by using a plasma-sheath equation, where negative ions produced on the plasma grid （PG） surface are considered in addition to positive ions and electrons. The potential profile depends on the amount and the temperature of the surface produced negative ions and the profile of the magnetic field. The negative potential peak is formed in the sheath region near the PG surface for the case of strong surface production of negative ions or low temperature negative ions. As the increase rate of the magnetic field near the wall becomes large, the negative potential peak becomes small.

关键词： negative ion source surface produced negative ion sheath potential cusp magnetic field electric potential plasma-sheath equation extraction region

Arc Power Limit and Distribution on the Large negative ion source Based on JT-60 NNBI

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中国核科技报告 2002年 900-904页

作者： LEI Guangjiu N. Umeda M. Kawai T. Yamamoto M. KuriyamaT. Ohga N. Ebisawa T. Yamazaki M. Kusaka K. KikuchiS. Hikida K. Usui M. Kazawa S. Numazawa K. MogakiA.Honda F. Satoh S. Norio K. Ooshima 1) Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibraraki-ken 311-0193, Japan.

The target of the large negative ion source based on neutral beam injection (N-NBI) is to produce neutral beam current of 22 A and beam power of 10 MW at 500 keV with duration time of 10 s [1-3]. Since it was successfully operated in 1996, the 5.3 MW neutral beam power at 380 keV with duration time of 3 s has been achieved. In recent years improving and enhancing the beam power are going on.

关键词： JT-60U NNBI negative ion source Arc discharge

First results of negative ion extraction with Cs for CRAFT prototype negative beam source

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Plasma Science and Technology 2021年第1期23卷 3-7页

作者：谢亚红胡纯栋韦江龙许永建蒋才超顾玉明赵远哲梁立振谢远来 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China

In order to understand the physics and pre-study the engineering issues for radio frequency(RF)negative beam source,a prototype source with a single driver and three-electrode accelerator was ***,the beam source was tested on the RF source test facility with RF plasma generation,negative ion production and extraction.A magnetic filter system and a Cs injection system were employed to enhance the negative ion *** a result,a long pulse of 105 s negative ion beam with current density of 153 A m-2 was repeatedly extracted *** source pressure is 0.6 Pa and the ratio of co-extracted electron and negative ion current is *** details of design and experimental results of beam source were shown in this letter.

关键词： neutral beam injector RF ion source negative ion source long pulse Cs feeding

High Power Neutral Beam Injection in LHD

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Plasma Science and Technology 2006年第1期8卷 24-27页

作者： K.TSUMORI Y.TAKEIRI K.NAGAOKA K.IKEDA M.OSAKABE Y.OKA O.KANEKO M.SHIBUYA T.KONDO M.SATO E.ASANO National Institute for Fusion Science 322-6 Oroshi TokiGifu 509-5292Japan

The results on high power injection with the ueutral bean, injection （NBI） system for the Large Helical Device （LHD） are reported. The system consists of three beam-lines with two hydrogen negative ion （H^- ion） sources installed in each beam-line. In order to improve the injection power, a new beam accelerator with a multi-slot grounded grid （MSGG） has been developed and applied to one beam-line. Using the accelerator, a maximum power of 5.7 MW was achieved in 2003 and 2004, and the maximum energy of 189 keV was reached. The power and energy exceeded the design values of the individual beam-line for LHD. The other beam-lines also increased their injection power up to about 4 MW, and the total injection power of 13.1 MW was achieved with three beam-llnes in 2003. Although the accelerator had an advantage in high power beam injection, extracted beams expand in the short side direction of the ground-grid slot. The disadvantage has been resolved by modifying the aperture shapes of the steering grid.

关键词： NBI negative ion source

Hefei utility negative ions test equipment with RF source:commissioning and first results

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Plasma Science and Technology 2018年第12期20卷 125-131页

作者：韦江龙谢亚红将才超梁立振崔庆龙陈世勇许永建王艳张黎谢远来胡纯栋 Institute of Plasma Physics Chinese Academy of Sciences University of Science and Technology of China

In order to study the key technology and physics of RF driven negative ion source for neutral beam injector in China, the Hefei utility negative ions test equipment with RF source was developed at Institute of Plasma Physics, Chinese Academy of Sciences（ASIPP）. Its negative ion source can be equipped with single or double RF drivers. There is a plasma expansion chamber with depth of 19 mm and an enhanced filter field. A three electrodes negative ion accelerator was employed to extract and accelerate the negative ions, which are plasma grid,extraction grid and ground grid. And there are several diagnostic tools for the plasma and beam parameters measurement. The characteristics of plasma generation, negative ion production and extraction were studied on the test equipment. The negative ion beam was extracted from the RF driven negative ion source for the first time. The detailed structure and main results are presented in this article.

关键词： neutral beam injection negative ion source CFETR negative ions extraction

Effect of H^- ion extraction on a plasma sheath under an external weak magnetic field

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Chinese Physics C 2013年第5期37卷 63-67页

作者：蓝朝晖彭宇飞杨振龙继东 Institute of Fluid Physics China Academy of Engineering Physics

The extraction of negative ions inevitably leads to the destruction of the original plasma state. To understand the effect of extraction on a plasma sheath under a weak magnetic filter field, the time-dependent behavior of H- ion extraction from a negative ion source has been studied by particle-in-cell simulation in the collisionless limit. The simulation results have shown that the plasma sheath would undergo a transient process, in which there exists an edge electrostatic wave that propagates counterclockwise along the wall with a velocity of 4 mm/ns until it reaches the other side of extraction aperture. The thickness of the plasma sheath and the plasma potential both increase greatly at the final quasi-steady-state. For comparison, the results of extracting positive ions are also given.

关键词： negative ion source plasma sheath ion extraction particle-in-cell simulation