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1.
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Analysis of plasma impedance in the Linac4 negative hydrogen ion source
/ Kobayashi, W (Keio U.) ; Nishida, K (Keio U.) ; Mattei, S (CERN) ; Lettry, J (CERN) ; Hoshino, K (Keio U.) ; Hatayama, A (Keio U.)
Linac4 is radio frequency (RF) driven type negative hydrogen H− ion source. In the RF system, it is required to match
the impedance between the RF-system and plasma loading. [...]
2018 - 7 p.
- Published in : AIP Conf. Proc. 2052 (2018) 050009
In : 6th International Symposium on Negative Ions, Beams and Sources, Novosibirsk, Russia, 3 - 7 Sep 2018, pp.050009
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2.
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3.
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Integrated modeling of the beam formation and extraction in the Linac4 hydrogen negative ion source
/ Nishioka, S (Keio U.) ; Abe, S (Keio U.) ; Mattei, S (CERN) ; Lallement, J B (CERN) ; Kalvas, T (Jyvaskyla U.) ; Hatayama, A (Keio U.) ; Lettry, J (CERN)
In order to make the predictive simulation tools for the extracted beam current and emittance in the Linac4 H− ion source, we have launched the development of the integrated model for the H− ion beam formation and extraction process. More specifically, our 3D KEIO-Beam Formation and eXtraction (3D KEIO-BFX) is coupled with the NINJA, IBSIMU and TRAVEL. [...]
2018 - 3 p.
- Published in : AIP Conf. Proc. 2011 (2018) 080017
In : International Conference on Ion Sources, CERN Geneva, Geneva, Switzerland, 15 - 20 Oct 2017, pp.080017
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4.
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Plasma impedance prediction model and impedance matching by frequency tuning in radio frequency negative ion sources
/ Kobayashi, W (Keio U.) ; Nishida, K (Keio U.) ; Mattei, S (CERN) ; Lettry, J (CERN) ; Hatayama, A (Keio U.)
A radio frequency (RF) driven type hydrogen (H−) source is used as an injector of Linac4. The power transfer efficiency between the RF generator and the ion source plasma is one of the important parameters that determines the extracted H− beam current. [...]
2018 - 3 p.
- Published in : AIP Conf. Proc. 2011 (2018) 050019
In : International Conference on Ion Sources, CERN Geneva, Geneva, Switzerland, 15 - 20 Oct 2017, pp.050019
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5.
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Numerical analysis of ion dynamics in RF ICP discharge
/ Nishida, K (Keio U.) ; Mattei, S (CERN) ; Kobayashi, W (Keio U.) ; Lettry, J (CERN) ; Hatayama, A (Keio U.)
We have worked on the development of a particle-based numerical model of a hydrogen Radio Frequency (RF) Inductively Coupled Plasma (ICP). In the previous work, it has been shown that the model is able to simulate the E-to-H discharge mode transition, which is one of the distinct features of RF ICP. [...]
2018 - 3 p.
- Published in : AIP Conf. Proc. 2011 (2018) 050014
In : International Conference on Ion Sources, CERN Geneva, Geneva, Switzerland, 15 - 20 Oct 2017, pp.050014
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6.
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Linac4 source extraction and low energy beam transport study
/ Noll, D (CERN) ; Bencini, V (CERN) ; Lallement, J B (CERN) ; Lettry, J (CERN) ; Lombardi, A M (CERN) ; Lorenzo, F Di (CERN) ; Mattei, S (CERN) ; O'Neil, M (CERN)
In the framework of the LHC Injector Upgrade program, a new normal conducting linac (Linac4) operating at the frequency of 352 MHz has been recently commissioned to the final energy of 160 MeV. Linac4 will be connected to the LHC injector chain in 2020 and it is expected to provide a 40 mA, 400 µs H− beam for charge-exchange injection into the Proton Synchrotron Booster. [...]
2018 - 3 p.
- Published in : AIP Conf. Proc. 2011 (2018) 080026
In : International Conference on Ion Sources, CERN Geneva, Geneva, Switzerland, 15 - 20 Oct 2017, pp.080026
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7.
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Analysis of H− extraction in the Linac4 negative ion source by 2.5D particle simulation
/ Abe, S (Keio U.) ; Nishioka, S (Keio U.) ; Mattei, S (CERN) ; Miyamoto, K (Naruto U. of Education) ; Hatayama, A (Keio U.) ; Lettry, J (CERN)
The purpose of this study is to investigate the extraction mechanisms of the H− ions in the Linac4 negative ion source by using an improved two-dimensional in real space and three-dimensional in velocity space Particle in Cell (2D3V-PIC) model. In this model, the following collision processes of the surface produced H− (Hsp−) ions have been introduced and the effects of the collisions on H− extraction have been analyzed: elastic (Hsp− - H2) and charge exchange (Hsp− - H). [...]
2018 - 3 p.
- Published in : AIP Conf. Proc. 2011 (2018) 080020
In : International Conference on Ion Sources, CERN Geneva, Geneva, Switzerland, 15 - 20 Oct 2017, pp.080020
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8.
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Experimental benchmark of the NINJA code for application to the Linac4 H− ion source plasma
/ Briefi, S (U. Augsburg (main)) ; Mattei, S (CERN ; CRPP, Lausanne) ; Rauner, D (U. Augsburg (main) ; Garching, Max Planck Inst. Plasmaphys.) ; Lettry, J (CERN) ; Tran, M Q (CRPP, Lausanne) ; Fantz, U (U. Augsburg (main) ; Garching, Max Planck Inst. Plasmaphys.)
For a dedicated performance optimization of negative hydrogen ion sources applied at particle accelerators, a detailed assessment of the plasma processes is required. Due to the compact design of these sources, diagnostic access is typically limited to optical emission spectroscopy yielding only lineof-sight integrated results. [...]
2017 - 17 p.
- Published in : New J. Phys. 19 (2017) 105006
Fulltext: PDF; External link: Fulltext
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9.
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Effects of the extraction voltage applied by the puller-electrode on the H$^−$ extraction in the Linac4 negative ion source
/ Abe, S (Keio U.) ; Nishioka, S (Keio U.) ; Mattei, S (CERN) ; Hatayama, A (Keio U.) ; Lettry, J (CERN)
In order to understand the H$^−$ extraction mechanism and investigate the effect of the extraction voltage applied by the puller-electrode on the H$^−$ extraction in the Linac4 negative ion source, we are developing a 2D3V-PIC (two dimensions in the real space and three dimensions in the velocity space, Particle in Cell) model with volume produced H$^−$ ions. It is shown that how to take the magnetic filter field direction is important for the 2D modeling to take into account the important 3D effect of electron $E \times B$ drift. [...]
2017 - 8 p.
- Published in : AIP Conf. Proc. 1869 (2017) 030051
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030051
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10.
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Investigation of the RF efficiency of inductively coupled hydrogen plasmas at 1 MHz
/ Rauner, D (Garching, Max Planck Inst. Plasmaphys. ; U. Augsburg (main)) ; Mattei, S (CERN ; CRPP, Lausanne) ; Briefi, S (U. Augsburg (main)) ; Fantz, U ; Hatayama, A (Garching, Max Planck Inst. Plasmaphys. ; U. Augsburg (main)) ; Lettry, J (CERN) ; Nishida, K (Keio U.) ; Tran, M Q (CRPP, Lausanne)
The power requirements of RF heated sources for negative hydrogen ions in fusion are substantial, which poses strong demands on the generators and components of the RF circuit. Consequently, an increase of the RF coupling efficiency would be highly beneficial. [...]
2017 - 8 p.
- Published in : AIP Conf. Proc. 1869 (2017) 030035
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030035
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