Numerical Analysis of Electronegative Plasma near the Extraction Grid in Negative Ion Sources

Kuppel, S.; Matsushita, D.; Hatayama, A.; Bacal, M.
March 2009
AIP Conference Proceedings;3/12/2009, Vol. 1097 Issue 1, p55
Conference Proceeding
The effects of plasma electrode (PE) bias on the extraction process in a negative ion source are studied with a series of two-dimensional (2D) electrostatic particle simulations. Motion of charged particles in their self-consistent electric field is modeled by the Particle-In-Cell (PIC) method. The effect of a weak transverse magnetic field is also taken into account. Extracted electron current density gradually decreases as the PE bias increases, while the absolute value of PE net current density initially increases and is saturated for higher values of PE bias. The extracted negative ion current density reaches a weak peak when the PE bias approaches the bulk plasma potential (Vpf) in the case without the PE bias, but the decrease afterwards is mild. Physical mechanisms leading to these results are discussed.


Related Articles

  • Direct plasma injection scheme with beam extraction in a radio frequency quadrupole linac cavity. Kashiwagi, Hirotsugu; Okamura, Masahiro; Tamura, Jun; Takano, Junpei // Review of Scientific Instruments;Feb2008, Vol. 79 Issue 2, p02C716 

    Direct plasma injection scheme (DPIS) is a recently developed idea about beam injection into a radio frequency quadrupole (RFQ) linac to obtain high current pulsed heavy ion beam. Since a laser ion source is directly connected to an RFQ linac, a low energy beam transport is not needed. An ion...

  • Modeling of the Plasma Electrode Bias in the Negative Ion Sources with 1D PIC Method. Matsushita, D.; Kuppel, S.; Hatayama, A.; Fukano, A.; Bacal, M. // AIP Conference Proceedings;3/12/2009, Vol. 1097 Issue 1, p38 

    The effect of the plasma electrode bias voltage in the negative ion sources is modeled and investigated with one-dimensional plasma simulation. A particle-in-cell (PIC) method is applied to simulate the motion of charged particles in their self-consistent electric field. In the simulation, the...

  • Plasmon Singularities from Metal Nanoparticles in Active Media: Influence of Particle Shape on the Gain Threshold. Cao, Min; Wang, Meng; Gu, Ning // Plasmonics;Jun2012, Vol. 7 Issue 2, p347 

    Localized surface plasmon singularities from metal nanoparticles in active media are investigated on the basis of classic linear electrodynamics. It is found that the gain threshold is inversely proportional to the shape factor of the particle. When relating this phenomenon to the plasmonic...

  • Numerical analysis of mixing enhancement for micro-electroosmotic flow. Tang, G. H.; He, Y. L.; Tao, W. Q. // Journal of Applied Physics;Jun2010, Vol. 107 Issue 10, p104906-1 

    Micro-electroosmotic flow is usually slow with negligible inertial effects and diffusion-based mixing can be problematic. To gain an improved understanding of electroosmotic mixing in microchannels, a numerical study has been carried out for channels patterned with wall blocks, and channels...

  • Why Ï€ and mrad? Becker, R.; Herrmannsfeldt, W. B. // Review of Scientific Instruments;Mar2006, Vol. 77 Issue 3, p03B907 

    Today it is generally accepted in the ion source and accelerator communities to communicate emittance data with units of π mm mrad or π cm mrad. The emittance of a beam with 2 cm diameter or width and an opening angle of 200 mrad then is written as E=100 π cm mrad. This example shows...

  • Low-energy ion decelerator for an external injection line at the NIRS-930 cyclotron. Honma, T.; Hojo, S.; Sakamoto, Y.; Muramatsu, M.; Miyahara, N.; Okada, T.; Komatsu, K.; Yamada, S. // Review of Scientific Instruments;Mar2006, Vol. 77 Issue 3, p03B909 

    A low-energy ion decelerator for the acceleration-deceleration system has been designed and installed in the beam-injection line of the NIRS-930 cyclotron in an attempt to increase the beam intensity from the cyclotron. With this acceleration-deceleration system, the beam intensity of 12C4+ ions...

  • NUMERICAL SIMULATION OF THE FORMATION AND PROPAGATION OF STREAMER. SETTAOUTI, A.; SETTAOUTI, L. // International Journal of Modern Physics C: Computational Physics;Jun2007, Vol. 18 Issue 6, p957 

    There has been considerable interest in non-thermal discharges over the past decade due to the increased number of industrial applications. The properties of discharges in electronegative gases are most frequently used for technological applications. For the improvement of performance in these...

  • Liquid lithium ion source: Nonlinear behavior of liquid surface in electric field. Pregenzer, Arian L.; Marder, Barry M. // Journal of Applied Physics;12/1/1986, Vol. 60 Issue 11, p3821 

    Studies the nonlinear behavior of liquid surface in electric field of liquid lithium ion source. Development of ion source for inertial confinement fusion; Linear theory for surface waves; Discussion on the results of the study.

  • 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....


Read the Article


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

Try another library?
Sign out of this library

Other Topics