Results 1 to 10 of about 1,617,958 (348)

Diagnostics tools and methods for negative ion source plasmas, a review

New Journal of Physics, 2017
Plasma parameter measurements for negative hydrogen (H ^− ) ion sources have been playing an important role in clarifying fundamental physics related to negative ion production and destruction processes. Measured data of beam properties, such as H ^− ion
Katsuyoshi Tsumori, Motoi Wada
doaj   +2 more sources

Overview of the design of the ITER heating neutral beam injectors [PDF]

New Journal of Physics, 2017
The heating neutral beam injectors (HNBs) of ITER are designed to deliver 16.7 MW of 1 MeV D ^0 or 0.87 MeV H ^0 to the ITER plasma for up to 3600 s. They will be the most powerful neutral beam (NB) injectors ever, delivering higher energy NBs to the ...
R S Hemsworth, D Boilson, P Blatchford, M Dalla Palma, G Chitarin, H P L de Esch, F Geli, M Dremel, J Graceffa, D Marcuzzi, G Serianni, D Shah, M Singh, M Urbani, P Zaccaria   +14 more
doaj   +2 more sources

Present status of numerical modeling of hydrogen negative ion source plasmas and its comparison with experiments: Japanese activities and their collaboration with experimental groups

New Journal of Physics, 2018
The present status of kinetic modeling of particle dynamics in hydrogen negative ion (H ^− ) source plasmas and their comparisons with experiments are reviewed and discussed with some new results.
A Hatayama, S Nishioka, K Nishida, S Mattei, J Lettry, K Miyamoto, T Shibata, M Onai, S Abe, S Fujita, S Yamada, A Fukano   +11 more
doaj   +2 more sources

Modeling of plasma transport and negative ion extraction in a magnetized radio-frequency plasma source

New Journal of Physics, 2017
Negative ion sources for fusion are high densities plasma sources in large discharge volumes. There are many challenges in the modeling of these sources, due to numerical constraints associated with the high plasma density, to the coupling between plasma
G Fubiani, L Garrigues, G Hagelaar, N Kohen, J P Boeuf   +4 more
doaj   +2 more sources

First operations with caesium of the negative ion source SPIDER

Nuclear Fusion, 2022
The negative-ion based neutral beam injector for heating and current drive of the ITER plasma (ITER HNB) is under development, at present focusing on the optimization of the full-scale plasma source in the SPIDER test stand.
E. Sartori, M. Agostini, M. Barbisan, M. Bigi, M. Boldrin, M. Brombin, R. Casagrande, S. Dal Bello, M. Dan, B. P. Duteil, M. Fadone, L. Grando, A. Maistrello, M. Pavei, A. Pimazzoni, C. Poggi, A. Rizzolo, A. Shepherd, M. Ugoletti, P. Veltri, B. Zaniol, R. Agnello, P. Agostinetti, V. Antoni, D. Aprile, V. Candeloro, C. Cavallini, R. Cavazzana, M. Cavenago, G. Chitarin, S. Cristofaro, M. Dalla Palma, R. Delogu, M. De Muri, S. Denizeau, F. Fellin, A. Ferro, C. Gasparrini, P. Jain, A. Luchetta, G. Manduchi, N. Marconato, D. Marcuzzi, I. Mario, R. Milazzo, R. Pasqualotto, T. Patton, N. Pilan, M. Recchia, A. Rigoni-Garola, B. Segalini, M. Siragusa, M. Spolaore, C. Taliercio, V. Toigo, R. Zagórski, L. Zanotto, M. Zaupa, M. Zuin, G. Serianni   +59 more
semanticscholar   +1 more source

Experimental study on the effect of cesium injection on negative ion yield of high power negative ion source

He jishu, 2021
BackgroundCesium injection can significantly reduce the work function of plasma grid surface of the radio frequency (RF) negative ion source, which is an effective way to promote the surface generation and improve the yield of H- ions.PurposeThis study ...
WANG Haoming, HU Chundong, CHEN Shiyong, XU Yongjian, PAN Junjun, WEI Jianglong, LIU Wei, CUI Qinglong, XIE Yahong, XIE Yuanlai, LIANG Lizhen   +10 more
doaj   +1 more source

Development of negative muonium ion source for muon acceleration

Physical Review Accelerators and Beams, 2021
A negative muonium ion (Mu^{-}) source using an aluminum foil target (Al target) was developed as a low-energy muon source. Mu^{-} ions are produced by irradiating the Al target with a 3-MeV positive muon (μ^{+}) beam and observed using a microchannel ...
R. Kitamura, S. Bae, S. Choi, Y. Fukao, H. Iinuma, K. Ishida, N. Kawamura, B. Kim, Y. Kondo, T. Mibe, Y. Miyake, M. Otani, G. P. Razuvaev, N. Saito, K. Shimomura, P. Strasser   +15 more
doaj   +1 more source

Enhancing ion extraction with an inverse sheath in negative hydrogen ion sources for NBI heating

Nuclear Fusion, 2023
Negative hydrogen ion (H ^− ) sources employed in neutral beam injection (NBI) systems are subject to extraction efficiency issues due to the considerable volumetric losses of negative hydrogen ions.
Guang-Yu Sun, Wei Yang, Jian Chen, Hao-Min Sun, Bao-Hong Guo, Shu Zhang, Ying-Han Wang, Xiong Yang, An-Bang Sun, Guan-Jun Zhang   +9 more
doaj   +1 more source

Negative ion source operation with deuterium

Plasma Sources Science & Technology, 2020
When the working gas of a negative ion source is changed from hydrogen to its isotope, deuterium, an ‘isotope effect’ is observed; namely, several plasma characteristics such as the electron energy distribution, the atomic fraction and the spectra of ...
M. Bacal, Motoi Wada
semanticscholar   +1 more source

Characterization of hydrogen plasma in a permanent ring magnet based helicon plasma source for negative ion source research [PDF]

Plasma Physics and Controlled Fusion, 2018
HELicon Experiment for Negative ion source (HELEN-I) with a single driver is developed with a focus on the production of negative hydrogen ions. In the Helicon wave heated plasmas, very high plasma densities (1018–1019 m−3) can be attained with electron ...
Arun Pandey, D. Mukherjee, M. Bandyopadhyay, D. Borah, H. Tyagi, R. Yadav, A. Chakraborty   +6 more
semanticscholar   +1 more source