Kinetic study of the secondary plasma created in the ITER neutraliser

Dure, F.; Lifschitz, A.; Bretagne, J.; Maynard, G.; Katsonis, K.; Simonin, A.; Minea, T.
March 2009
AIP Conference Proceedings;3/12/2009, Vol. 1097 Issue 1, p374
Academic Journal
The properties of the secondary plasma created inside the ITER Neutral Beam Injector (NBI) neutraliser, through the interaction of the high energetic hydrogen beam with the molecular hydrogen gas, have been analysed. Starting from the results of our OBI-2 PIC Monte-Carlo numerical code, detailed kinetic of the hydrogen plasma has been studied using a Collisional-Radiative model. In this model, the electron distribution function is determined by solving a Boltzmann equation, whereas main plasma species are derived from balance equations. This paper presents preliminary results obtained in a 0D geometry, boundary conditions bing introduced through effective rates for gain and loss of particles at the neutraliser walls. It has been found that the main ion specie is H2+, essentially coming from the ionisation of the target gas. The electron energy distribution function is not maxwellian and its mean energy is about 5 eV. The plasma-wall interactions yield a strong contribution, in particular regarding the density of molecular ion H3+. Assuming several independent slices of plasma along the negative ions beam axis, the axial profile of the secondary plasma has been analysed. It has been found that the density and mean energy profiles of the plasma electrons are directly related to the plasma potential profile, which in turn closely follows the gas density one.


Related Articles

  • Exact Analytical Solutions of Self-Consistent Equations of Plasma Hydrodynamics with Absorbing Boundary Conditions. Fedorov, V. A. // Technical Physics Letters;May2005, Vol. 31 Issue 5, p385 

    Exact analytical solutions of a one-dimensional self-consistent system of nonlinear hydrodynamic equations are obtained for plasma with absorbing boundary conditions on the conducting surface of an insulated body. The electric field strength, electron velocity, and electron density in the plasma...

  • Electron state density and electron diffusion coefficient in energy space in nonideal nonequilibrium plasmas. Bobrov, A. A.; Bronin, S. Ya.; Zelener, B. B.; Zelener, B. V.; Manykin, E. A. // Journal of Experimental & Theoretical Physics;Jul2008, Vol. 107 Issue 1, p147 

    We suggest a model for a hydrogenic low-temperature nonequilibrium nonideal plasma that allows the kinetic parameters of the plasma to be calculated by the method of molecular dynamics by taking into account the interparticle interaction. The charges interact according to Coulomb’s law;...

  • 2D Model of a Tandem Plasma Source: The Role of the Transport Processes. Paunska, Tsvetelina V.; Shivarova, Antonia P.; Tarnev, Khristo Ts.; Tsankov, Tsanko V. // AIP Conference Proceedings;3/12/2009, Vol. 1097 Issue 1, p12 

    A 2D fluid-plasma model of a tandem two-chamber plasma source operating in hydrogen gas is presented in the study. The configuration of the source is of the type of the inductively-driven sources developed for neutral beam injection heating of fusion plasmas: the rf power deposition is in the...

  • Charge exchange recombination spectroscopy for α particles colliding with hydrogen atoms. Liu, X. J.; Liu, L.; Wang, J. G.; Qu, Y. Z.; Xiao, B. J. // Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p103301 

    The intensities of charge exchange recombination spectroscopy (CXRS) of α particles colliding with the hydrogen atoms in the neutral beam injection (NBI) are calculated by solving the rate equations including electron collision processes in the quasi-static state approximation. The effects of...

  • Numerical analysis of primary electrons in a tandem-type negative ion source. Katoh, K.; Takado, N.; Hatayama, A.; Hanada, M.; Seki, T.; Inoue, T. // Review of Scientific Instruments;Mar2006, Vol. 77 Issue 3, p03A535 

    To clarify the physical mechanism of the plasma spatial nonuniformity observed in tandem-type negative-ion sources, the primary electron-transport process has been analyzed by a three-dimensional Monte Carlo simulation code. In the model, equations of motion for electrons are numerically solved....

  • Characteristics of rf H- Ion Source by Using FET Power Source. Ando, A.; Moon, C. H.; Komuro, J.; Tsumori, K.; Takeiri, Y. // AIP Conference Proceedings;3/12/2009, Vol. 1097 Issue 1, p291 

    Characteristics of radio frequency(rf) plasma production are investigated using a FET inverter power supply as an rf generator. The matching circuit in the inverter system is simple compared to a conventional 50 Ohm matching system and only an imaginary part of the impedance of rf transmission...

  • Experiments on the Detection of Negative Hydrogen Ions in a Small-size Tandem Plasma Source. Lishev, Stiliyan St.; Shivarova, Antonia P.; Tsankov, Tsanko V. // AIP Conference Proceedings;3/12/2009, Vol. 1097 Issue 1, p127 

    A small-size inductively-driven tandem (two-chamber) plasma source, with a magnetic filter for electron cooling located in the second chamber of the source, is studied experimentally. The results are for the concentration of the negative hydrogen ions in the expanding plasma region of the source...

  • On the possibility of plasma discharge initiation in the vicinity of an electrically insulated metal target bombarded by high-energy neutral particles. Fedorov, V. A. // Technical Physics Letters;Jun2009, Vol. 35 Issue 6, p563 

    The possibility of plasma discharge initiation in the vicinity of an electrically insulated metal target occurring in plasma under the action of an incident flux of high-energy neutral particles is considered. Conditions for initiating discharge are determined and formulated as requirements on...

  • Numerical study of neutral beam probe spectroscopy for edge fluctuation measurements. Komori, A.; Nagai, S.; Morisaki, T.; Kawai, Y. // Review of Scientific Instruments;Dec1990, Vol. 61 Issue 12, p3787 

    A thermal neutral beam probing combined with a spectroscopic technique is numerically demonstrated to be available to the measurement of local electron-density fluctuations in edge plasmas, although the spatial attenuation of the beam due to the electron-impact ionization is not negligible. It...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics