|
1.
|
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
|
|
|
2.
|
|
|
3.
|
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
|
|
|
4.
|
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
|
|
|
5.
|
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
|
|
|
6.
|
Numerical simulation of the RF plasma discharge in the Linac4 H$^−$ ion source
/ Mattei, S (CERN ; CRPP, Lausanne) ; Nishida, K (Keio U.) ; Onai, M (Keio U.) ; Lettry, J (CERN) ; Tran, M Q (CRPP, Lausanne) ; Hatayama, A (Keio U.)
This paper presents a Particle-In-Cell Monte Carlo Collision simulation of the Radio-Frequency (RF) plasma heating in the Linac4 H$^−$ ion source at CERN. The model self-consistently takes into account the electromagnetic field generated by the RF coil, the external static magnetic fields and the resulting plasma response, including a kinetic description of the charged species (e$^−$, H$^+$, H$^+_2$, H$^+_3$, H$^−$), as well as the atomic and molecular (vibrationally resolved) populations. [...]
2017 - 7 p.
- Published in : AIP Conf. Proc. 1869 (2017) 030018
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030018
|
|
|
7.
|
A fully-implicit Particle-In-Cell Monte Carlo Collision code for the simulation of inductively coupled plasmas
/ Mattei, S (CERN ; CRPP, Lausanne) ; Nishida, K (Keio U.) ; Onai, M (Keio U.) ; Lettry, J (CERN) ; Tran, M Q (CRPP, Lausanne) ; Hatayama, A (Keio U.)
We present a fully-implicit electromagnetic Particle-In-Cell Monte Carlo collision code, called NINJA, written for the simulation of inductively coupled plasmas. NINJA employs a kinetic enslaved Jacobian-Free Newton Krylov method to solve self-consistently the interaction between the electromagnetic field generated by the radio-frequency coil and the plasma response. [...]
2017 - 16 p.
- Published in : J. Comput. Phys. 350 (2017) 891-906
Fulltext: PDF;
|
|
|
8.
|
|
|
9.
|
CERN’s Linac4 cesiated surface H$^{-}$ source
/ Lettry, J (CERN) ; Aguglia, D (CERN) ; Bertolo, S (CERN) ; Briefi, S ; Butterworth, A (CERN) ; Coutron, Y (CERN) ; Dallocchio, A (CERN) ; David, N (CERN) ; Chaudet, E (CERN) ; Fantz, U et al.
Linac4 cesiated surface H$^{-}$ sources are routinely operated for the commissioning of the CERN’s Linac4 and on an ion source test stand. Stable current of 40-50 mA are achieved but the transmission through the LEBT of 80% was below expectations and triggered additional beam simulation and characterization. [...]
2017
- Published in : AIP Conf. Proc. 1869 (2017) 030002
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030002
|
|
|
10.
|
Experimental investigation of plasma impedance in Linac4 $H^−$ source
/ Nishida, K (Keio U.) ; Mattei, S (CERN) ; Briefi, S (Augsburg U.) ; Butterworth, A (CERN) ; Grudiev, A (CERN) ; Haase, M (CERN) ; Jones, A (CERN) ; Paoluzzi, M M (CERN) ; Voulgarakis, G (CERN) ; Hatayama, A (Keio U.) et al.
CERN ’s new particle accelerator Linac4 is part of the upgrade of the LHC accelerator chain. Linac4 is required to deliver 160 MeV H− beam to improve the beam brightness and luminosity in the Large Hadron Collider (LHC). [...]
2017 - 9 p.
- Published in : AIP Conf. Proc. 1869 (2017) 030038
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030038
|
|