SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)最新文献_第3页

H− ion source research and development at the Oak Ridge National Laboratory 橡树岭国家实验室的氢离子源研究与开发

SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020) Pub Date : 2021-07-30 DOI: 10.1063/5.0057549

R. Welton, M. Stockli, B. Han, S. Murray, T. Pennisi, C. Stinson, A. Aleksandrov, C. Piller, Y. Kang, O. Tarvainen

{"title":"H− ion source research and development at the Oak Ridge National Laboratory","authors":"R. Welton, M. Stockli, B. Han, S. Murray, T. Pennisi, C. Stinson, A. Aleksandrov, C. Piller, Y. Kang, O. Tarvainen","doi":"10.1063/5.0057549","DOIUrl":"https://doi.org/10.1063/5.0057549","url":null,"abstract":"The U.S. Spallation Neutron Source (SNS) is a state-of-the-art neutron scattering facility delivering the world's most intense pulsed neutron beams to a wide array of instruments which are used to conduct investigations in many fields of science and engineering. Neutrons are produced by spallation of liquid Hg due to bombardment of short (∼1µs), intense (∼35 A) pulses of protons delivered at 60 Hz from a storage ring which is fed by a high-intensity, 1 GeV H− LINAC. This facility has operated almost continuously since 2006, with ion source performance increasing over those years, and currently providing 50-60 mA of H− ions with a duty-factor of 6% for maintenance-free runs of ∼120 days with near 100% availability. Ion source research and development at ORNL has played a key role in enabling and supporting these achievements: this report provides some historical highlights of this effort, describes our current ion source testing facilities, discusses the goals of the program and finally provides a snapshot of some of our ongoing R&D activities. In particular, we have recently simplified and improved the reliability of the plasma ignition gun for the external antenna ion source which is discussed in detail.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79928670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Development of external RF antenna based cusp free high duty factor pulsed negative hydrogen ion source 基于外置射频天线的无尖峰高占空因数脉冲负氢离子源研制

SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020) Pub Date : 2021-07-30 DOI: 10.1063/5.0058103

D. V. Ghodke, R. Khare, Rajnish Kumar, Manish Pathak, S. K. Jain, A. Amban, K. Krishnan, Kuldeep K Singh, P. Shrivastava, V. Prasad

{"title":"Development of external RF antenna based cusp free high duty factor pulsed negative hydrogen ion source","authors":"D. V. Ghodke, R. Khare, Rajnish Kumar, Manish Pathak, S. K. Jain, A. Amban, K. Krishnan, Kuldeep K Singh, P. Shrivastava, V. Prasad","doi":"10.1063/5.0058103","DOIUrl":"https://doi.org/10.1063/5.0058103","url":null,"abstract":"An external RF antenna based cusp free negative hydrogen (H−) ion source has been designed and developed. This source operates at 10% duty factor and the key experimental results are reported in the paper. The extracted H- ion beam current is 11 mA with 2 ms pulse duration and 50 Hz repetition rate at 50 keV beam energy. Operation of the H- ion source at high duty factor results in temperature rise in components. This may lead to failure of electronic components, vacuum joints of the plasma or igniter chambers, or burn out the extraction electrodes. In order to keep the operating temperature within limits, a water cooling system was designed and incorporated for (i) the 2 MHz RF antenna operating at 90 A RMS at 7 kV AC, (ii) the extraction electrodes, operating at a maximum voltage of 15 kV DC, (iii) the plasma chamber (made of Aluminium Nitride, transparent to RF field with high thermal conductivity), and (iv) the Faraday cup for H- ion current measurement. Forced air cooling was used for the 13.56 MHz RF-based pulsed igniter, plus on the various current-stabilizing electrode biasing networks and RF impedance matching networks.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88523322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and structural analysis of V8 engine piston by using different materials 采用不同材料的V8发动机活塞设计与结构分析

SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020) Pub Date : 2021-07-30 DOI: 10.1063/5.0058665

K. Kumar, Balram Yelamasetti, V. Vardhan, M. D. Raheem

引用次数: 0

Analysis of plasma characteristics of a high-power radio frequency negative ion source based on Langmuir probe 基于Langmuir探针的大功率射频负离子源等离子体特性分析

SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020) Pub Date : 2021-07-30 DOI: 10.1063/5.0057631

Yongjian Xu, X. Peng, Lingda Yu, Wei Liu, Xie Yahong, Chundong Hu, Yuanlai Xie

{"title":"Analysis of plasma characteristics of a high-power radio frequency negative ion source based on Langmuir probe","authors":"Yongjian Xu, X. Peng, Lingda Yu, Wei Liu, Xie Yahong, Chundong Hu, Yuanlai Xie","doi":"10.1063/5.0057631","DOIUrl":"https://doi.org/10.1063/5.0057631","url":null,"abstract":"The plasma parameters of the radio frequency (RF) negative ion source directly affect the density of negative ions and the uniformity of the plasma in the extraction area. In order to understand the behavior of the plasma inside the RF negative ion source, a system of planar and cylindrical Langmuir probes was developed. The system was tested on the RF ion source test facility at the Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). The Langmuir probe was used to measure the spatial distribution of the plasma parameters in the extraction area and the axial distribution of the plasma parameters in the expansion area. In the experiment, the relationship between the density parameters and the RF power and source pressure is explored. Experimental results show that the plasma parameters present better uniformity, whilst the electron temperature is maintained at a lower level (about 0.8eV) due to the filter magnet field in the extraction area. Also, it has been measured that the electron density can reach up to 6 × 1016 m−3 at 55 kW of RF power. Considering the production of negative ions in the extraction area, the Electron Energy Probability Function (EEPF) is also given at different operational parameters. This article helps us to understand the plasma characteristics and provide technical support for experimental studies of negative ion production and extraction.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90944490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Primary electron analysis to improve the negative ion uniformity toward ITER-class long pulse and high-power negative ion sources 对iter级长脉冲和大功率负离子源进行一次电子分析，提高负离子均匀性

SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020) Pub Date : 2021-07-30 DOI: 10.1063/5.0057507

Y. Shimabukuro, M. Ichikawa, M. Murayama, G. Saquilayan, A. Kojima, H. Tobari, M. Kashiwagi

{"title":"Primary electron analysis to improve the negative ion uniformity toward ITER-class long pulse and high-power negative ion sources","authors":"Y. Shimabukuro, M. Ichikawa, M. Murayama, G. Saquilayan, A. Kojima, H. Tobari, M. Kashiwagi","doi":"10.1063/5.0057507","DOIUrl":"https://doi.org/10.1063/5.0057507","url":null,"abstract":"A novel Eclair-shaped filter magnetic field with no primary electron leakage has been proposed to reduce the co-extracted electrons and improve the spatial uniformity of negative ion production. A primary electron analysis was conducted to clarify its spatial distribution and the issue of current magnetic field configuration because the experimental data imply that the negative ion population is low on the edge segments due to the many primary electrons around there. A simulation study revealed that the low capability of electron confinement at the KAMABOKO source’s edge region due to the localized magnetically weak points induces the primary electron leakage, which causes high co-extracted electron current and negative ion non-uniformity. Calculation results showed a new design index that contributes to the complete suppression of primary electron leakage to the extraction region with a permanent magnet connection angle of 108 degrees or more. The Eclair-shaped ion source has been designed based upon the obtained index about the connection angle to realize the ideal magnetic configuration without primary electron leakage to the extraction region.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76304928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation of beam extraction and optics of an NBI negative ion source NBI负离子源光束提取及光学特性的数值模拟

SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020) Pub Date : 2021-07-30 DOI: 10.1063/5.0058286

Fei-Long Song, G. Zou, Dong Li, C. Zuo, Dezhi Chen, Guangjiu Lei

引用次数: 4

Investigation on mechanical properties of composite for different proportion of natural fibres with epoxy resin 天然纤维与环氧树脂不同配比复合材料力学性能的研究

SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020) Pub Date : 2021-07-30 DOI: 10.1063/5.0058046

N. Rajneesh, Ch. Ashok Kumar, K. P. Kumar, S. Udayabhaskar

引用次数: 7

Modelling and analysis of centrifugal compressor 3D impeller 离心式压缩机三维叶轮建模与分析

SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020) Pub Date : 2021-07-30 DOI: 10.1063/5.0058095

Shaik Shashavali, C. Chakravarthy, N. Prabhakar

引用次数: 1

VLSI design techniques for low power MAC unit: A review 低功耗MAC单元的VLSI设计技术综述

SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020) Pub Date : 2021-07-30 DOI: 10.1063/5.0057909

A. Sahu, Rashmi Samanth, T. Mendez, S. G. Nayak, K. V. Kedlaya

引用次数: 0

110 mA operation of J-PARC cesiated RF-driven H− ion source J-PARC的110 mA操作使rf驱动的氢离子源停止

SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020) Pub Date : 2021-07-30 DOI: 10.1063/5.0057552

A. Ueno, K. Ohkoshi, K. Ikegami, A. Takagi, K. Shinto, H. Oguri

{"title":"110 mA operation of J-PARC cesiated RF-driven H− ion source","authors":"A. Ueno, K. Ohkoshi, K. Ikegami, A. Takagi, K. Shinto, H. Oguri","doi":"10.1063/5.0057552","DOIUrl":"https://doi.org/10.1063/5.0057552","url":null,"abstract":"The Japan Proton Accelerator Research Complex (J-PARC) cesiated RF-driven H− ion source (IS) has been stably operated for about six years. From Sep. 2018, the J-PARC 400 MeV LINAC has been steadily operated with the design H− ion beam intensity (IH−) of 50 mA, when a 60 mA beam is injected from the IS. At each end of about 3 months J-PARC operation, the IS supplies a 52.5 keV 72 mA beam for the LINAC 60 mA acceleration. The IS superior emittances predicted in a test-stand were proven by the high RFQ acceleration efficiency of 94.3 % (IH− = 67.9 mA). The high intensity beam with transverse emittances suitable for the RFQ is produced with several unique measures, such as slight water molecule addition into hydrogen plasma; low temperature (about 70 °C) operation of 45°-tapered 16-mm thick plasma electrode with the precise cesium density control; impurity elimination in the hydrogen plasma along with the filter-field optimization; continuous-wave igniter plasma driven with a 50-W 30-MHz RF, and so on. The 110 mA operation results of the IS in the test-stand are presented in this paper. A 65 keV 110 mA H− ion beam, about 103 mA of which was inside the transverse emittances used for a common RFQ design, was stably operated with a duty factor of 4.5 % (1 ms x 45 Hz). The interesting relationship of the IH− without any emittance blowups upon the required beam energy (WH-) was derived as IH−(WH−) = 71.2 x (WH- / 52.5)^2.03. The IS is the benchmark one for the next generation high energy H− LINACs aiming for 100 mA class intensity.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86056706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3