Abstract
A refined model of processes taking place in electrostatic extractors is proposed. The model is based on the analysis of the present-day state of theoretical studies in this field and takes into account both the Langmuir and Bohm mechanisms of ion transport, calculations of initial profile of ionic current to the cathode, and the integrated contribution of ionic current to the anode. The Bohm mechanism is shown to make the dominant contribution to ion extraction for typical values of initial ionic densityn 0i ≥1010 cm−3. Under these conditions, this mechanism not only causes a considerable (by more than an order of magnitude) decrease in plasma relaxation time τ R in comparison with the values determined by the usual Langmuir mechanism, but also substantially modifies the main structural dependences of the relaxation time, which are found to be now in good agreement with the experimental power dependences. The new results obtained in the work favor the view that electrostatic (nonmagnetic) ion extraction systems provide a rather high efficiency at an increased (n 0i ∼1011 cm−3) plasma density and, correspondingly, at a high power density.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
P. T. Greenland,J. Contemp. Phys.,31, 405 (1990).
F. F. Chen,Phys. Fluids,25, 2385 (1982).
K. Okano,J. Nucl. Sci. Technol.,29, 601 (1992).
K. Yamada, H. Okada, T. Tetsuka, and K. Yoshioka,J. Nucl. Sci. Technol.,30, 143 (1993).
K. Yamada, T. Tetsuka, and Y. Deguchi,J. Appl. Phys.,67, 6734 (1990).
K. Yamada, T. Tetsuka, and Y. Deguchi,J. Appl. Phys.,69, 6962 (1991).
K. Yamada and T. Tetsuka,J. Nucl. Sci. Technol.,31, 301 (1994).
K. Yamada, T. Tetsuka, and Y. Deguchi,J. Appl. Phys.,69, 8064 (1991).
K. Ogura, T. Arisawa, and T. Shibata,Jpn. J. Appl. Phys., Part 1,31, 1485 (1992).
I. I. Litvinov, “Physical principles of plasma acceleration in electric and magnetic fields,” in:Fifth Soviet Union Symposium on Plasma Injectors, Kurchatov Institute of Atomic Energy, Moscow (1969).
I. I. Litvinov, “Mechanisms of plasma acceleration in a magnetic nozzle”, in:Plasma Accelerators [in Russian], Kurchatov Institute of Atomic Energy, Moscow (1972), No. 6.
D. Bohm,The Characteristics of Electrical Discharges in Magnetic Fields, McGraw-Hill, New York (1949), Ch. 2.
Author information
Authors and Affiliations
Additional information
Translated from a manuscript submitted April 2, 1996.
Rights and permissions
About this article
Cite this article
Litvinov, I.I. Theory of ion extraction from plasma by an external electric field in systems of laser isotope separation. J Russ Laser Res 18, 87–99 (1997). https://doi.org/10.1007/BF02558670
Issue Date:
DOI: https://doi.org/10.1007/BF02558670