Article
Physics, Fluids & Plasmas
Wei Yang, Fei Gao, You-Nian Wang
Summary: This study identifies essential physicochemical processes in a high-current negative hydrogen ion source within a pressure range of 1-100 Torr, showing the importance of vibrational levels of hydrogen molecules in the production of negative hydrogen ions under varying pressures. The results suggest that a simplified model is robust and provides acceptable results in complex simulations.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Review
Physics, Multidisciplinary
U. Fantz, S. Briefi, A. Heiler, C. Wimmer, D. Wuenderlich
Summary: This article discusses the neutral beam injection systems for ITER, focusing on the operational aspects and current challenges. The need for improved RF power transmission efficiency and the significant impact of drift on co-extracted electrons and beam properties are highlighted. Understanding and improving the optical properties of large beamlets is a crucial task for future developments in this field.
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Yu-Liang Fu, Juan Yang, Xu Xia, An-Bang Sun
Summary: This study systematically investigates the effect of discharge chamber length on the performance of electron cyclotron resonance ion thruster through integrated simulation. The results show that a shorter discharge chamber length can increase electron energy gain and plasma density, but decrease ion beam current. High-temperature electrons upstream of the screen grid contribute significantly to ionization. This study provides new insights for the design of electron cyclotron resonance ion thrusters in the future.
ACTA PHYSICA SINICA
(2023)
Article
Physics, Fluids & Plasmas
Siyu Xing, Fei Gao, Yuru Zhang, Yingjie Wang, Guangjiu Lei, Younian Wang
Summary: A radio-frequency inductively coupled negative hydrogen ion source has been used in the China Fusion Engineering Test Reactor to produce negative hydrogen ions. Through a three-dimensional fluid model with the level-lumping method, the production and transportation of H- in the source are investigated under high power and different pressures. The results show that the density of H- at the bottom of the expansion region first increases and then decreases with pressure, and the introduction of a magnetic filter significantly increases the H- density.
PLASMA SCIENCE & TECHNOLOGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Vipin Shukla, Mainak Bandyopadhyay, Vivek Pandya, A. Pandey, A. Maulik
Summary: This paper presents an AI-driven model for predicting the outputs of the ion source HELEN-I, using a heuristic global optimization algorithm to select the optimal input parameters without real-time experiments. Experimental studies confirm the effectiveness of this approach.
ENGINEERING WITH COMPUTERS
(2022)
Article
Instruments & Instrumentation
Sung-Ryul Huh, Bong-Ki Jung, Jong-Gab Jo, Min Park, Seung Ho Jeong, Tae-Seong Kim, Dae-Sik Chang
Summary: The Korea Atomic Energy Research Institute has developed a novel cesium-free negative hydrogen/deuterium ion source system that utilizes magnetic filters and plasma pulsing to achieve highly efficient negative ion volume formation. This system can also extend the duration of high current values using alternate dual pulsing. These findings suggest that the multi-pulsed ion source system could serve as an alternative to cesium seeded ion sources in providing continuous high-density negative ions.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Energy & Fuels
Yanfei Li, Xin Zhang, Yue Wang, Jiuling Sun
Summary: In this study, the combustion characteristics of turbulent stratified combustion under different background equivalent ratio conditions were experimentally investigated. The results show that concentration stratification of the mixture can accelerate flame propagation speed, and an appropriate degree of stratification is beneficial for improving flame stability.
Article
Instruments & Instrumentation
Yuhang Chen, Liangchao Zhao, Jidong Long, Xiaozhong He, Pan Dong, Tao Wang, Jie Li, Jinshui Shi, Zhen Yang
Summary: Internal Penning ion source is commonly used in compact cyclotrons, and this study explores the relationship between cathode size and plasma state to prolong the ion source's lifetime.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Energy & Fuels
Yanfei Li, Xin Zhang, Yue Wang
Summary: In this study, premixed combustion experiments were conducted on methane-hydrogen-air mixtures to analyze the flame characteristics, combustion pressure, and ion current signal. The addition of hydrogen influenced the flame front structure and flame stability. The concentration of hydrogen had a significant impact on flame speed and ion current signal under both dilute and rich hydrogen conditions. Turbulence accelerated combustion velocity and resulted in earlier peak combustion pressure, but the difference between peak pressures in laminar and turbulent environments decreased with the addition of hydrogen.
Article
Instruments & Instrumentation
Kapil Motwani, Dharmraj V. Ghodke, Ajith Amban, Murali Krishnan Kochunarayanan, M. S. Ansari, Vijendra Prasad
Summary: The simplest way to produce high density hydrogen plasmas is to form an arc between the arcing electrode and the plasma chamber. This paper describes the development and testing of a pulsed power supply that delivers constant current pulses, using a high frequency buck converter topology. By changing the arc current, the arc impedance and the positive hydrogen ion current were also measured.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Nanoscience & Nanotechnology
Yasuaki Haba, Mitsutoshi Aramaki, Katsuyoshi Tsumori, Masaki Osakabe, Katsunori Ikeda, Haruhisa Nakano, Kenichi Nagaoka
Summary: This paper investigates the control of negative ion beamlet divergence and reveals the abundance ratio of multiple components in the negative ion source by measuring the transverse velocity distribution. This contributes to the improvement of negative ion beamlet divergence.
Article
Physics, Applied
Wenbin Wu, Shixiang Peng, Ailin Zhang, Tenghao Ma, Yaoxiang Jiang, Kai Li, Bujian Cui, Zhiyu Guo, Jiaer Chen
Summary: A hybrid discharge heating mode is proposed for microwave ion sources, which improves power efficiency and optimizes source performance.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Biochemistry & Molecular Biology
Andrey V. Zobnin, Andrey M. Lipaev, Alexander D. Usachev
Summary: This study proposes a low-density discharge plasma model that considers the impact of oxygen admixture in complex plasmas. Numerical simulations show that the concentration of negative ions is significantly high and plays a crucial role in the plasma kinetics. Furthermore, the proposed model explains the phenomenon observed in experiments and provides an alternative explanation.
Article
Physics, Multidisciplinary
Zengshan Li, Jinghan Yang, Dong Li, Peng Chen, Chen Zuo, Dezhi Chen
Summary: Optical emission spectroscopy (OES) is used to study the plasma spectroscopic characterization of an RF driven negative ion source at HUST. The gas temperature, electron temperature, electron density, and density ratio of atomic hydrogen to molecular hydrogen are determined from OES. A thermal model shows that electron impact dissociation of molecular hydrogen is the dominant source of gas heating and 11% to 12% of the delivered power is dissipated in gas heating at 0.3 Pa filling pressure. The absolute intensity of Balmer lines and Fulcher band is used to obtain the electron temperature, electron density, and the ratio of atomic to molecular density.
Article
Instruments & Instrumentation
Nikolai R. Lobanov, Thomas Tunningley, Peter Linardakis, Elena G. Vvedenskaia
Summary: In sputter-type negative ion sources, the creation of a sputter crater and formation of an intense plasma glow have a significant impact on negative ion currents and ionization efficiencies. This study proposes that the phenomena of hollow cathode discharges (HCDs) play a major role in sputter-type negative ion sources. By evaluating the phenomenology of a discharge with a hollow cathode, an analytical formula is derived to define the neutral particle density inside the cathode cavity and explain how HCDs occur in sputter-type negative ion sources. The HCD effect in sputter-type negative ion sources complements existing mechanisms of negative ion production.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2023)
Article
Physics, Fluids & Plasmas
YoungHwa An, Jeongwon Lee, JongGab Jo, Bong-Ki Jung, HyunYeong Lee, Kyoung-Jae Chung, Yong-Su Na, T. S. Hahm, Y. S. Hwang
Article
Physics, Fluids & Plasmas
Jeongwon Lee, Jayhyun Kim, YoungHwa An, Min-Gu Yoo, Y. S. Hwang, Yong-Su Na
Article
Physics, Fluids & Plasmas
JongGab Jo, H. Y. Lee, S. C. Kim, S. H. Kim, Y. H. An, Y. S. Hwang
PHYSICS OF PLASMAS
(2017)
Article
Instruments & Instrumentation
Inwoo Song, C. R. Seon, Joohwan Hong, Y. H. An, R. Barnsley, R. Guirlet, Wonho Choe
REVIEW OF SCIENTIFIC INSTRUMENTS
(2017)
Article
Instruments & Instrumentation
C. R. Seon, J. H. Hong, I. Song, J. Jang, H. Y. Lee, Y. H. An, B. S. Kim, T. M. Jeon, J. S. Park, W. Choe, H. G. Lee, S. Pak, M. S. Cheon, J. H. Choi, H. S. Kim, W. Biel, P. Bernascolle, R. Barnsley
REVIEW OF SCIENTIFIC INSTRUMENTS
(2017)
Article
Instruments & Instrumentation
Jungmin Jo, MunSeong Cheon, Junghee Kim, YoungHwa An, Seungil Park, Kyoung-Jae Chung, Y. S. Hwang
REVIEW OF SCIENTIFIC INSTRUMENTS
(2017)
Article
Physics, Applied
Kern Lee, Kyoung-Jae Chung, Y. S. Hwang
APPLIED PHYSICS LETTERS
(2018)
Article
Nuclear Science & Technology
Jungmin Jo, MunSeong Cheon, Kyoung-Jae Chung, Y. S. Hwang
FUSION ENGINEERING AND DESIGN
(2018)
Article
Nuclear Science & Technology
Jeongwon Lee, SeongCheol Kim, JongYoon Park, Young-Gi Kim, YoungHwa An, Min-Gu Yoo, Jeong-hun Yang, Kyoung-Jae Chung, Y. S. Hwang, Yong-Su Na
FUSION ENGINEERING AND DESIGN
(2018)
Article
Physics, Multidisciplinary
June Young Kim, K. S. Chung, Seongcheol Kim, Jong Hyeon Ryu, Kyoung-Jae Chung, Y. S. Hwang
NEW JOURNAL OF PHYSICS
(2018)
Article
Instruments & Instrumentation
Jungmin Jo, MunSeong Cheon, Junghee Kim, Soobin Lim, M. Isobe, K. Ogawa, T. Nishitani, Seugil Park, I. Murata, Kyoung-Jae Chung, Y. S. Hwang
REVIEW OF SCIENTIFIC INSTRUMENTS
(2018)
Article
Instruments & Instrumentation
Kyumin Choe, DongHwan Kim, Kyoung-Jae Chung, Y. S. Hwang
REVIEW OF SCIENTIFIC INSTRUMENTS
(2019)
Article
Nuclear Science & Technology
YoungHwa An, MunSeong Cheon, Sunil Pak, Jaemin Kim, Changrae Seon, Jihyun Choi, H. G. Lee
FUSION ENGINEERING AND DESIGN
(2019)
Article
Nuclear Science & Technology
Haewon Shin, Inwoo Song, YoungHwa An, Wonho Choe
FUSION ENGINEERING AND DESIGN
(2020)
Article
Physics, Fluids & Plasmas
June Young Kim, Jae Young Jang, K. S. Chung, Kyoung-Jae Chung, Y. S. Hwang
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2019)