检索结果-南通市图书馆

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

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nanotechnology and Precision Engineering 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

基于光腔衰荡光谱法的大面积负离子源负离子产生特性研究

在线全文

学校读者我要写书评

暂无评论

核技术 2025年第1期48卷 185-191页

作者：朱腾赛梁立振谢亚红曹正坤彭旭峰胡纯栋中国科学院合肥物质研究院合肥230031 中国科学技术大学合肥230026

光腔衰荡光谱(Cavity Ring-down Spectroscopy,CRDS)是一种灵敏度很高的吸收光谱测量技术。根据该技术在大面积负离子源上的需求,研制了基于负离子光致剥离的CRDS诊断系统,开展了负离子产生相关特性研究。本文首先详细介绍了CRDS装置的... 详细信息

光腔衰荡光谱(Cavity Ring-down Spectroscopy,CRDS)是一种灵敏度很高的吸收光谱测量技术。根据该技术在大面积负离子源上的需求,研制了基于负离子光致剥离的CRDS诊断系统,开展了负离子产生相关特性研究。本文首先详细介绍了CRDS装置的运行原理和构成,然后利用该系统开展了射频功率、源腔气压和偏置电压等不同实验参数下对氢负离子产生的特性研究。实验结果表明:射频功率和源腔气压的升高都会引起氢负离子的增多,由于两者变化对电子温度产生的不同影响,氢负离子的增长速率在两者影响下的变化情况相反;由于等离子体电位的存在,偏置电压存在一个有利于氢负离子产生的最优值。

关键词：负离子源光腔衰荡光谱衰荡时间氢负离子密度电子温度

Preliminary results of optical emission spectroscopy by line ratio method in the RF negative ion source at ASIPP

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2019年第4期21卷 155-160页

作者： Yan WANG Zhimin LIU lizhen liang Chundong HU Institute of Plasma Physics Chinese Academy of SciencesHefei 230031.People's Republic of China University of Science and Technology of China.Hefei 230026.People's Republic of China

Optical emission spectroscopy(OES)using the trace rare gases of Ar and Xe have been carried out in a radio frequency(RF)driven negative ion source at Institute of Plasma Physics,Chinese Academy of Science(ASIPP),in order to determine the electron temperature and density of the hydrogen *** line-ratio methods based on population models are applied to describe the radiation process of the excited state particles and establish their relations with the plasma *** spectral lines from the argon and xenon excited state atoms with the wavelength of 750.4 and 828.0 nm are used to calculate the electron temperature based on the corona *** argon ions emission lines with the wavelength of 480 and 488 nm are selected to calculate the electron density based on the collisional radiative *** has given the preliminary results of the electron temperature and density by varying the discharge gas pressure and RF *** to the experimental results,the typical plasma parameters isTe2≈2-4 eV and ne≈1 x 1017-8 x 1017 m^-3 in front of plasma grid.

关键词： optical emission spectroscopy neutral beam injection RF negative ion source

Design of the reflection magnet and its shielding effect analysis for the neutral beam injector of EAST

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2011年第2期22卷 70-76页

作者： liang lizhen HU Chundong XIE Yuanlai WEI Jianglong XIE Yahong LI Jun Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China

In this paper,a reflection magnet to be installed in the EAST neutral beam injection system is simulated and *** field intensity of reflection magnet of 42-cm maximum bending radius is about 1.539×10-1 T for 100 keV deuterium *** shielding cage is formed by *** the ANSOFT software,the magnetic shielding effect was estimated at about 3% at the magnet pole region.

关键词：中性束注入系统屏蔽效果效果分析设计反射磁铁 Ansoft软件磁场强度

紧凑型ECR-DD中子发生器二次电子抑制研究

在线全文

学校读者我要写书评

暂无评论

真空科学与技术学报 2025年第2期45卷 81-88页

作者：廖晨伦孟献才李旭李晨暄谢亚红曹小岗徐伟李辉梁立振合肥综合性国家科学中心能源研究院(安徽省能源实验室) 合肥230031 东华理工大学核科学与工程学院南昌330013 中国科学院合肥物质科学研究院等离子体物理研究所合肥230031 中国科学院高能物理研究所北京100049

中子发生器在工作时,D+被加速轰击至钛靶,钛靶受到高能束流轰击的同时表面会产生二次电子,加重电源负载,影响系统的稳定性。文章研究了不同电极结构对腔室温度、真空度和中子产额的影响。结果表明电极腰孔的形状会直接影响二次电子从腰... 详细信息

中子发生器在工作时,D+被加速轰击至钛靶,钛靶受到高能束流轰击的同时表面会产生二次电子,加重电源负载,影响系统的稳定性。文章研究了不同电极结构对腔室温度、真空度和中子产额的影响。结果表明电极腰孔的形状会直接影响二次电子从腰孔逃逸的数量,并进一步影响腔室壁温度,导致壁吸附气体的释放,提升高压打火的频率。模拟分析了二次电子的传输路径,模拟显示靶面溅射二次电子一部分从腰孔溢出轰击在腔室壁,一部分溅射在电极内侧,少部分被反向加速轰击在陶瓷窗上,模拟结果与实物痕迹相吻合。基于该结果开展了电阻与磁场两种方式下二次电子的抑制实验,结果表明采用30−68 kΩ的电阻能较好抑制二次电子,此时能在相对较小的电流下获得更高的中子产额;使用1.3 T剩磁永磁铁在中心产生约100 Gs磁场,能实现二次电子的有效偏转,不影响中子产额的情况下电流下降约23%,实现二次电子的抑制效果。总的来说,在保证电极内部真空度的情况下,应尽量在电极壁开小孔或不开孔或采取有效的二次电子抑制措施,有助于提升中子发生器的稳定性,进而延长其使用寿命。

关键词：氘氘中子源二次电子抑制电阻抑制磁场抑制

同方期刊数据库

Analysis of the characteristics of the plasma of an RF driven ion source for a neutral beam injector

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2020年第2期22卷 109-114页

作者： Yongjian XU Li ZHANG Chundong HU Yahong XIE Caichao JIANG Jianglong WEI lizhen liang Yuanlai XIE Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Nuclear Power Institute of China Chengdu 10213People’s Republic of China

A radio frequency(RF)driven ion source is a very important component of a neutral beam injector for large magnetic confinement fusion *** order to study the key technology and physics of an RF driven ion source for a neutral beam injector in China,an RF ion source test facility was developed at the Institute of Plasma Physics,Chinese Academy of *** this paper,a two-dimensional fluid model is used to simulate the fundamental physical characteristics of RF plasma *** results show the relationship of the characteristics of plasma(such as electron density and electron temperature)and RF power and gas *** order to verify the effectiveness of the model,the characteristics of the plasma are investigated using a Langmuir *** this paper,experimental and simulation results are presented,and the possible reasons for the discrepancies between them are *** paper can help us understand the characteristics of RF plasma discharge,and give a basis for further R&D for an RF ion source.

关键词： RF ion source numerical simulation neutral beam injection inductive coupled plasma

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

在线全文

学校读者我要写书评

暂无评论

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

作者： Yahong XIE Chundong HU Jianglong WEI Yongjian XU Caichao JIANG Yuming GU Yuanzhe ZHAO lizhen liang Yuanlai XIE 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

Achievement of 1000 s plasma generation of RF source for neutral beam injector

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2019年第2期21卷 5-8页

作者： Chundong HU Yahong XIE Yongjian XU Caichao JIANG Jianglong WEI Yuming GU Qinglong CUI lizhen liang Shiyong CHEN Yuanlai XIE Institute of Plasma Physics Chinese Academy of Sciences

A radio frequency(RF) ion source was developed for neutral beam injector in Institute of Plasma Physics, Chinese Academy of Sciences(ASIPP). A cylindrical driver based RF plasma source was tested and optimized for long pulse operation. Recently, the plasma source achieved 1000 s stable plasma discharge with RF power of 35 k W and source pressure of 0.7 Pa for the first *** heat loading on each of driver components such as the Faraday shield(FS), RF coil and expansion chamber was measured by the water flow calorimeter system. The experiment results showed that FS is the component with highest heat loading and the heat loading on FS was about 65.8% of total heat loading on source. The details of the long pulse operation of RF plasma source are presented in this paper.

关键词： neutral beam injector RF ion source water flow calorimeter long pulse

Effects of Rivastigmine Combined with Reinhartdt and Sea Cucumber Capsule in Patients with Mild-to-Moderate Parkinson’s Disease Dementia: A Pilot Study

在线全文

学校读者我要写书评

暂无评论

Chinese Medicine 2014年第2期5卷 94-103页

作者： Yongxing Yan lizhen liang Tao Xie Yonghui Shen Yanjing Cao Department of Neurology The Third People’s Hospital of Hangzhou Hangzhou China Department of Neurology University of Chicago Medicine Chicago USA

Many patients with Parkinson’s disease suffer cognitive impairment or dementia. Cholinesterase inhibitors (ChEIs) have positive effects on patients with Parkinson’s Disease Dementia (PDD). But it is only improve symptoms. There is no etiological cure for PDD. So, In order to achieve the best outcomes, the combination of ChEIs and other therapeutic strategies is needed to study.?In the present study, we investigate the efficacy and safety of rivastigmine combined with Reinhartdt and Sea Cucumber Capsule (RSC) in patients with mild-to-moderate PDD, and its effect on thyroid function.?There were 52 patients were randomly assigned to receive either rivastigmine (3 mg/ day) or rivastigmine plus RSC (2.7 g/day) treatment for 24 weeks. Efficacy was investigated by the change of the scores of Alzheimer’s Disease Assessment Scale cognitive subscale (ADAS-Cog), Activities of Daily Life (ADL) and Unified Parkinson’s Disease Rating Scale (UPDRS) part III (motor scale). Meanwhile, thyroid hormone levels were detected before and after 12 weeks, 24 weeks treatment in all patients. Results showed that?the patients treated with rivastigmine plus RSC showed more improvement in the cognition and the daily life activities compared to those treated with rivastigmine alone. Significant difference was present after being treated for 12 weeks or more. However, no group difference was found on UPDRS part III, thyroid hormone level change and the incidence of adverse events (11.1% vs 16.0%) between the two groups of treatment. Adverse effects were nausea and vomiting which were the main reasons for the dropout. The finding suggests that Rivastigmine plus RSC may improves the treatment effects in cognition and the ADL of the patients with mild-to-moderate PDD, compared with the rivastigmine treatment alone. However, no effect was observed on the motor symptoms and thyroid hormone levels. In addition, this joint treatment is safe.

关键词： Parkinson’s Disease Cognitive Function Rivastigmine Reinhartdt and Sea Cucumber