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

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Design of powertrain of an off-road racing vehicle 越野赛车动力系统设计
Chaitanya Peshin, S. Praharaj
The objective of this paper is to design the powertrain system of an off-road racing vehicle, in accordance with the performance targets. Powertrain of a vehicle describes the flow of power from its generation on the throttle to the driving of the wheels. This includes the engine, transmission, drive-shafts, differentials, and the final drive. Over the entire process software such as SolidWorks, Ansys and MATLAB have been extensively used, to conduct simulation studies ranging from Static Structural, Thermal, Modal Analysis etc. The initial process in the study was the selection of components in the vehicle, based on which calculations were done to compute the exact specifications of the components to be designed. To ensure accuracy, and simplicity for calculation of parameters in subsequent iterations, a MATLAB model was created. Relevant simulations of all the components were conducted on Ansys to reduce chances of failure and to achieve the desired results. A virtual Powertrain model on MATLAB with input parameters from the Suspension and Braking subsystems was also setup to obtain real time characteristic values of the vehicle, in the form of graphs, which can later be analyzed to improve the vehicle performance.
本文的目标是根据性能目标设计越野车的动力总成系统。车辆的动力系统描述了从油门产生到驱动车轮的动力流。这包括发动机、变速器、驱动轴、差速器和最终驱动器。在整个过程中,广泛使用SolidWorks、Ansys、MATLAB等软件,进行了从静力结构、热、模态分析等方面的仿真研究。研究的最初过程是选择车辆的部件,在此基础上进行计算,以计算要设计的部件的确切规格。为了保证后续迭代参数计算的准确性和简洁性,建立了MATLAB模型。在Ansys上对所有部件进行了相关仿真,减少了失效的几率,达到了预期的效果。以悬架和制动子系统为输入参数,在MATLAB上建立虚拟动力系统模型,获取车辆的实时特征值,并以图形的形式进行分析,以提高车辆的性能。
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引用次数: 0
Design of FPGA-based triggering and synchronization system for laser photo detachment diagnostic in ROBIN 基于fpga的ROBIN激光光脱离诊断触发与同步系统设计
H. Tyagi, R. Yadav, K. Pandya, H. Mistri, K. Patel, M. Bandyopadhyay, A. Gahlaut, M. Bhuyan, M.J. Singh, A. Chakraborty
ROBIN is a single RF driver based negative ion test bed currently in operation at IPR, Gandhinagar, India. To understand and have deeper insights of physical phenomena, several diagnostics have been interfaced with ROBIN system. To quantify the negative ion density, laser photo detachment (LPD) diagnostic is configured. LPD at ROBIN is based on single high power Nd:YAG laser which has a pulse width of 3 ns and repetition rate of 20 Hz. Successful integration of LPD needs control on laser energy, precise triggering and detection of weak signals. Precise triggering has two aspects. One is to control laser energy via a delay between the flash lamp and Q-switch pulses; the second is to trigger it in phase with the 1 MHz RF signal. This required a triggering system which can work with an accuracy of few nanoseconds. A triggering and synchronization system (TSS) based on a custom field programmable gate array(FPGA) is designed and integrated in order to assure reliable and synchronized operation of the laser. Precise delay between laser pulses is necessary to obtain appropriate laser energy and to prevent the active Nd:YAG rod medium from thermal damage. In order to synchronize the laser operation with 1 MHz RF, Rogowskii coil based peak detection is used and interfaced with TSS. The LPD setup is HV referenced; hence the interfaces were designed with optical isolation. Another challenge is to detect weak signals from the LPD probe. For this, a custom low-noise pre-amplifier circuit is designed to measure signal in the range of 1-2 mA in the presence of large RF noise. The engineering solution designed for LPD interface contains mix of analog and digital systems. The TSS is based on a low cost FPGA platform, with custom analog-based interfaces. The unit has been integrated without using any specific commercial system for the desired goal. The data from diagnostic is being currently analysed. This paper presents the details regarding the design of interfacing electronics of the LPD, along with some test results. In addition, the FPGA firmware, the control software and signal acquisition process are presented.
ROBIN是一个基于单一射频驱动器的负离子测试台,目前在印度甘地纳加尔的IPR运行。为了理解和更深入地了解物理现象,将几种诊断方法与ROBIN系统相结合。为了量化负离子密度,配置了激光光剥离(LPD)诊断。ROBIN的LPD是基于单个高功率Nd:YAG激光器,脉冲宽度为3 ns,重复频率为20 Hz。LPD的成功集成需要对激光能量的控制、精确的触发和微弱信号的检测。精确触发有两个方面。一种是通过闪光灯和q开关脉冲之间的延迟来控制激光能量;第二种是与1mhz射频信号相触发。这就需要一个精确到几纳秒的触发系统。为了保证激光器的可靠同步工作,设计并集成了一种基于定制现场可编程门阵列(FPGA)的触发与同步系统(TSS)。为了获得适当的激光能量和防止有源Nd:YAG棒介质的热损伤,需要精确的激光脉冲间延迟。为了使激光操作与1 MHz射频同步,使用基于Rogowskii线圈的峰值检测并与TSS接口。LPD设置是HV参考的;因此,设计了光隔离接口。另一个挑战是检测来自LPD探测器的弱信号。为此,设计了一个定制的低噪声前置放大器电路,用于测量存在较大RF噪声的1-2 mA范围内的信号。为LPD接口设计的工程解决方案包含模拟系统和数字系统的混合。TSS基于低成本的FPGA平台,具有定制的模拟接口。该装置已经集成,没有使用任何特定的商业系统的预期目标。目前正在分析来自诊断的数据。本文详细介绍了LPD接口电子器件的设计,并给出了一些测试结果。此外,还介绍了FPGA固件、控制软件和信号采集过程。
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引用次数: 0
Futuristic evaluation of CoVID-19 spread using transfer learning: A post vaccination scenario 使用迁移学习对CoVID-19传播的未来评估:疫苗接种后情景
Sunitha Devi Bigul, A. Prakash, J. S. Bhanu
Corona virus (CoVID) has spread like wild-fire across the globe, and measures to curb this disease are still under development. With vaccination of CoVID coming to market, it is necessary to observe the effects of this vaccination on the global scale. Along with this observation it is essential to understand the spreading trend of CoVID post vaccination, which will help Governments to deploy vaccination centres in the areas where CoVID might re-spread. In order to solve this issue, the underlying text proposes a novel transfer learning approach. This approach learns from the spreading patterns of CoVID which are being currently observed, and links it with the vaccination measures taken by the Government during the previous Spanish Influenza pandemic of 1918. This linkage is backed up by the analysis of re-spreading of Spanish Influenza post its vaccination. In order to develop an effective prediction system, the linkage information is given to a transfer learning system. This system enables effective prediction of post vaccination CoVID spread. Due to unavailability of any similar previously developed architecture, the comparison is made with the post-vaccination spread data for Spanish Influenza in 1918, and an accuracy of more than 80% is observed. © 2021 Author(s).
冠状病毒(CoVID)已像野火一样在全球蔓延,遏制这一疾病的措施仍在制定中。随着CoVID - 19疫苗的上市,有必要在全球范围内观察这种疫苗接种的效果。与此同时,了解疫苗接种后CoVID的传播趋势至关重要,这将有助于各国政府在可能再次传播CoVID的地区部署疫苗接种中心。为了解决这一问题,本文提出了一种新的迁移学习方法。这一方法借鉴了目前观察到的CoVID的传播模式,并将其与政府在上一次1918年西班牙流感大流行期间采取的疫苗接种措施联系起来。对西班牙流感疫苗接种后再次传播的分析支持了这种联系。为了开发有效的预测系统,将联动信息赋给迁移学习系统。该系统能够有效预测疫苗接种后CoVID - 19的传播。由于没有任何类似的先前开发的架构,与1918年西班牙流感疫苗接种后的传播数据进行了比较,观察到准确率超过80%。©2021作者。
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引用次数: 0
List of NIBS 2020 Registered Participants: Seventh International Symposium on Negative Ions, Beams and Sources NIBS 2020注册参与者名单:第七届负离子、束和源国际研讨会
BelchenkoYuri, FairclothDan, LawrieScott, TarvainenOlli, WadaMotoi
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引用次数: 0
Operational experience with the ELENA ion source 有ELENA离子源的操作经验
D. Gamba, D. Aguglia, B. Lefort, Christophe Machado, F. Wenander, R. Gebel
The Extremely Low ENergy Antiproton (ELENA) is a compact ring that was recently installed to complement the antimatter factory at CERN. A local H−/p source is connected to ELENA for commissioning purposes of the ring and subsequent electrostatic transfer lines toward experiments, allowing to progress with the commissioning phase also in the absence of antiprotons. The ELENA source can produce pulses of H−, with a length of a few µs and an intensity of approximately 50 µA at 100 keV, to mimic the antiproton pulse at extraction energy. In addition, the source can deliver proton pulses, if need be. After a few years of operation, several observations have been collected that will be presented in this work. Of particular interest is the observation of a fast (about 1 MHz) intra-pulse instability for H−, which resulted in poor intensity stability of the H− beam injected into ELENA. Possible ways of stabilising the beam pulse have been found and will be presented. The 100 kV High Voltage (HV) insulation transformer turned out to be the most critical component of the source hardware. The original transformer suffered from insulation degradation over time and several iterations were necessary to build a reliable solution, for which details will also be presented.
极低能量反质子(ELENA)是一个紧凑的环,最近安装补充反物质工厂在欧洲核子研究中心。一个局部H - /p源连接到ELENA,用于环的调试目的和随后的实验静电传输线,允许在没有反质子的情况下进行调试阶段。在100 keV下,ELENA源可以产生长度为几µs,强度约为50µa的H−脉冲,以模拟提取能量下的反质子脉冲。此外,如果需要,该源还可以传送质子脉冲。经过几年的操作,收集了一些观察结果,将在本工作中介绍。特别令人感兴趣的是观察到H -的快速(约1 MHz)脉冲内不稳定性,这导致注入ELENA的H -束的强度稳定性差。稳定光束脉冲的可能方法已经被发现并将被提出。100千伏高压(HV)绝缘变压器是电源硬件中最关键的部件。随着时间的推移,原始变压器的绝缘性能会下降,需要多次迭代才能构建可靠的解决方案,详细信息也将介绍。
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引用次数: 0
BTR code recent modifications for multi-run operation BTR代码最近修改为多运行操作
E. Dlougach, P. Veltri
BTR code (Beam Transmission with Re-ionization) has been used for many years in the design and performance optimization of Neutral Beam Injection (NBI) systems based on negative or positive ion sources. BTR beam formation and transmission along the beam line is simulated by a simple and comprehensive 6D beam model, which accounts for beam losses and power deposition on the injector surfaces. Beam particles are followed in a deterministic manner in electromagnetic fields, with transforming on gas and plasma targets, including the neutralization and ionization in gas or plasma. Power flux and power deposition profiles are the main BTR output which can be calculated in any plane along the injector. For older BTR versions, each single Run (or beam start) supposed a direct data input through user interface tools. Besides, older BTR was not flexible enough to work with different Tasks (tracking options) within each Run. In order to obtain and process the results from multiple BTR Runs, a User had to spend lots of time and efforts. BTR recent upgrades, which come with the new version BTR-5, make possible to run multi-parametric scans of different Scenarios of NBI operation - with small manual efforts and with higher results control, given a predefined list of Scenarios input. NBI geometry has become more flexible, allowing the combination of the Standard NBI approach and Free-Surfaces input, which can be taken from CAD design. New, Multi-Run approach implemented in BTR-5 offers to set the parameters for each BTR Task within a Scenario. This allows to have optimum statistics for detailed maps resolution, and to reduce the overall time for runs and results processing. BTR-5 has been used in the design studies of the Duct Liner Module (DLM) for ITER HNB. The DLM model was created by CAD and imported to BTR-5 in text format, combined with standard NBI components Configuration. The results of the power loads throughout different operation scenarios are shown. The conclusions are made on the DLM worst case scenario, and on the maximum power load for each DL surface.
基于负离子或正离子源的中性束注入(NBI)系统的设计和性能优化已经使用了多年的BTR代码(再电离光束传输)。采用简单全面的6D光束模型模拟了BTR光束沿光束线的形成和传输,该模型考虑了光束损失和喷射器表面的功率沉积。束流粒子在电磁场中以确定性的方式跟随,在气体和等离子体目标上发生转化,包括气体或等离子体中的中和和电离。功率通量和功率沉积曲线是主要的BTR输出,可以在沿喷射器的任何平面上计算。对于旧的BTR版本,每次运行(或光束启动)都假定通过用户界面工具直接输入数据。此外,旧的BTR不够灵活,无法在每次运行中处理不同的任务(跟踪选项)。为了获取和处理多个BTR运行的结果,用户必须花费大量的时间和精力。BTR最近升级了新版本BTR-5,可以对NBI操作的不同场景进行多参数扫描,只需少量的人工操作,就可以获得更高的结果控制,并提供预定义的场景输入列表。NBI几何形状变得更加灵活,可以将标准NBI方法和自由曲面输入相结合,可以从CAD设计中获取。在BTR-5中实施的新的多运行方法提供了在一个场景中为每个BTR任务设置参数。这允许为详细的地图分辨率提供最佳统计数据,并减少运行和结果处理的总时间。BTR-5已被用于ITER HNB管道内衬模块(DLM)的设计研究。通过CAD创建DLM模型,并结合标准NBI组件配置,以文本格式导入BTR-5。在不同的运行情况下,显示了电力负荷的结果。结论是基于DLM的最坏情况和每个DL表面的最大功率负载得出的。
{"title":"BTR code recent modifications for multi-run operation","authors":"E. Dlougach, P. Veltri","doi":"10.1063/5.0057502","DOIUrl":"https://doi.org/10.1063/5.0057502","url":null,"abstract":"BTR code (Beam Transmission with Re-ionization) has been used for many years in the design and performance optimization of Neutral Beam Injection (NBI) systems based on negative or positive ion sources. BTR beam formation and transmission along the beam line is simulated by a simple and comprehensive 6D beam model, which accounts for beam losses and power deposition on the injector surfaces. Beam particles are followed in a deterministic manner in electromagnetic fields, with transforming on gas and plasma targets, including the neutralization and ionization in gas or plasma. Power flux and power deposition profiles are the main BTR output which can be calculated in any plane along the injector. For older BTR versions, each single Run (or beam start) supposed a direct data input through user interface tools. Besides, older BTR was not flexible enough to work with different Tasks (tracking options) within each Run. In order to obtain and process the results from multiple BTR Runs, a User had to spend lots of time and efforts. BTR recent upgrades, which come with the new version BTR-5, make possible to run multi-parametric scans of different Scenarios of NBI operation - with small manual efforts and with higher results control, given a predefined list of Scenarios input. NBI geometry has become more flexible, allowing the combination of the Standard NBI approach and Free-Surfaces input, which can be taken from CAD design. New, Multi-Run approach implemented in BTR-5 offers to set the parameters for each BTR Task within a Scenario. This allows to have optimum statistics for detailed maps resolution, and to reduce the overall time for runs and results processing. BTR-5 has been used in the design studies of the Duct Liner Module (DLM) for ITER HNB. The DLM model was created by CAD and imported to BTR-5 in text format, combined with standard NBI components Configuration. The results of the power loads throughout different operation scenarios are shown. The conclusions are made on the DLM worst case scenario, and on the maximum power load for each DL surface.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82521647","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: 1
NIBS 2020 reference sheets NIBS 2020参考表
T. Sarmento, D. Wünderlich, U. Fantz, R. Friedl, D. Rauner, K. Tsumori, L. Shenjin, W. Chen, D. Bollinger, O. Hidetomo, K. Shinto, I. Draganíc, R. Welton
In preparation for NIBS 2020 various labs prepared reference sheets containing key information about their ion sources and the machines that they serve. The contents of the reference sheets have been formatted and edited into this paper for posterity and ease of access.
为了准备NIBS 2020,各实验室准备了参考表,其中包含有关其离子源及其所服务的机器的关键信息。参考资料表的内容已被格式化并编辑成本文,以方便后人查阅。
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引用次数: 0
Interface boundary conditions for global models of multi-chamber negative hydrogen ion sources 多腔室负氢离子源全局模型的界面边界条件
S. Averkin, S. Veitzer
Global models of plasma discharges are a standard tool in plasma fluid simulations incorporating complicated chemistry. These models use global balances of energy and conservation of species number in order to estimate volume averaged number densities and temperatures of plasma components. Simple semi-analytic estimates of species density profiles valid in a wide range of parameters are used in order to include wall fluxes. Due to the nature of the wall fluxes estimation, the global models are limited to single chamber designs for which analytic solutions were obtained. In this paper we present the development of interface bound-ary conditions that allow the use of conventional global models for separate chambers. For this reason we present an approximate solution of an ambipolar diffusion problem in a two-chamber geometry. Additional source terms corresponding to interface bound-ary conditions provide closure for simulations of multi-chamber ion sources. We intend to use the derived boundary conditions in an extension of the Global Enhanced Vibrational Kinetic Model (GEVKM) [1] with updated hydrogen plasma chemistry [2] to model multi-chamber negative hydrogen sources. We analyze the derived relations and discuss its applicability for the negative hydrogen ion source developed at IPP Garching.
等离子体放电的全局模型是等离子体流体模拟中包含复杂化学的标准工具。这些模型利用整体能量平衡和物质数量守恒来估计等离子体组分的体积平均密度和温度。为了包括壁面通量,使用了在广泛参数范围内有效的物种密度剖面的简单半解析估计。由于壁面通量估计的性质,全局模型仅限于获得解析解的单腔设计。在本文中,我们提出了界面边界条件的发展,允许使用传统的整体模型分离室。为此,我们提出了双腔几何中双极性扩散问题的近似解。与界面边界条件相对应的附加源项为多室离子源的模拟提供了封闭性。我们打算在全球增强振动动力学模型(GEVKM)[1]的扩展中使用导出的边界条件,并更新氢等离子体化学[2]来模拟多室负氢源。我们分析了推导关系,并讨论了其在IPP Garching开发的负氢离子源中的适用性。
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引用次数: 0
High-speed emittance measurements for beams extracted from J-PARC RF ion source J-PARC射频离子源提取光束的高速发射度测量
T. Shibata, K. Shinto, M. Wada, H. Oguri, K. Ikegami, K. Ohkoshi, K. Nanmo
Oscillation of emittance and Twiss parameters in the negative ion (H−) beam from the J-PARC 2MHz RF ion source is measured by application of a double-slit emittance monitor located at the RFQ entrance. The emittance monitor is equipped with a newly-developed 60 MS/s data acquisition system, so that beam current oscillations at a few MHz can be observed with enough time resolution. From the measurement, it is shown that the beam phase space consists of: (1) a Direct Current component in the beam core; (2) a 2 MHz oscillating component which takes place in the diverging halo; (3) a doubled RF frequency (4 MHz) oscillation which faintly exists in the beam halo. The major component is the 2 MHz component, which resultantly decides the beam emittance oscillation frequency. A typical value of the beam emittance in the present experiment is 0.33 π mm-mrad, while the amplitude of the 2 MHz oscillation is around 0.04 π mm-mrad. The results indicate that the high-frequency oscillation component occupying about ten-percent of the beam from the RF source travels a few meters passing through a magnetic lens focusing system.
利用安装在RFQ入口的双缝发射度监测仪,测量了J-PARC 2MHz射频离子源的负离子(H -)束的发射度和Twiss参数的振荡。发射度监测仪配备了新开发的60 MS/s数据采集系统,可以在足够的时间分辨率下观测到几MHz的波束电流振荡。测量结果表明,束流相空间由:(1)束流芯中有直流分量;(2)在发散光晕中发生的2mhz振荡分量;(3)在波束晕中隐约存在双倍射频频率(4mhz)振荡。主分量为2mhz分量,从而决定波束发射度振荡频率。在本实验中,波束发射度的典型值为0.33 π mm-mrad,而2 MHz振荡幅度约为0.04 π mm-mrad。结果表明,占据射频源光束10%左右的高频振荡分量通过磁透镜聚焦系统传播了几米。
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引用次数: 2
Fatigue analysis of four cylinder engine crank shaft 四缸发动机曲轴疲劳分析
C. Kumar, S. Bhaskar, N. Rajneesh
The engine crankshaft plays a major role in the internal combustion engines. The combustion pressure is transmitted on to the crankshaft through connecting rod. The inertia forces buckle the connecting rod during transmission of motion. The crankshaft is mounted with a flywheel and the torque is transmitted to the wheels through the gear box. During combustion process huge amount of gas load acts on the piston which is transmitted to the crankshaft. This load is a variable load, due to which fatigue stresses are induced on the shaft. Variations in the strength of the shaft may lead to failure of the engine. Fatigue analysis has been carried on the multi cylinder engine crankshaft by considering two different materials.
发动机曲轴在内燃机中起着重要的作用。燃烧压力通过连杆传递到曲轴上。在运动传递过程中惯性力使连杆弯曲。曲轴上安装有飞轮,扭矩通过齿轮箱传递给车轮。在燃烧过程中,大量的气体负荷作用在活塞上,并传递给曲轴。这种载荷是可变载荷,因此轴上产生疲劳应力。轴强度的变化可能导致发动机的故障。对考虑两种不同材料的多缸发动机曲轴进行了疲劳分析。
{"title":"Fatigue analysis of four cylinder engine crank shaft","authors":"C. Kumar, S. Bhaskar, N. Rajneesh","doi":"10.1063/5.0058052","DOIUrl":"https://doi.org/10.1063/5.0058052","url":null,"abstract":"The engine crankshaft plays a major role in the internal combustion engines. The combustion pressure is transmitted on to the crankshaft through connecting rod. The inertia forces buckle the connecting rod during transmission of motion. The crankshaft is mounted with a flywheel and the torque is transmitted to the wheels through the gear box. During combustion process huge amount of gas load acts on the piston which is transmitted to the crankshaft. This load is a variable load, due to which fatigue stresses are induced on the shaft. Variations in the strength of the shaft may lead to failure of the engine. Fatigue analysis has been carried on the multi cylinder engine crankshaft by considering two different materials.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86119851","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: 6
期刊
SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)
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