NS  Vol.2 No.5 , May 2010
Research on the plasma dynamics in a magnetically self-insulated ion diode with explosive emission potential electrode
ABSTRACT
The results of an experimental investigation of the plasma dynamics in a magnetically insu- lated ion diode in bipolar-pulse mode are presented. The experiments were done at the pulsed TEMP-4M accelerator by formation of a first negative pulse (100 ns, 150-200 kV) and a second positive pulse (80 ns, 250-300 kV). The voltage-current diode characteristics were used to analyze the plasma behavior in the anode- cathode gap. It is shown that, during the first pulse, a discrete emissive surface is formed on the graphite potential electrode and a plasma forms by explosive-emission, which before the second pulse comes, fills the whole working surface of the electrode and spreads to the anode-cathode gap. An analytical expression is obtained for the total current in the cellular structure approximation. It is shown that the current build-up for a cathode surface with dis- crete emitting centers is described satisfac- torily by a modified Child-Langmuir formula wi- th a form factor decreasing from F = 6 to 1. It is found that, once plasma formation at the gra- phite potential electrode is complete and until the second positive pulse, the plasma speed is constant and equals 1.3 ± 0.2 cm/μs.

Cite this paper
Pushkarev, A. , Isakova, Y. and Sazonov, R. (2010) Research on the plasma dynamics in a magnetically self-insulated ion diode with explosive emission potential electrode. Natural Science, 2, 419-426. doi: 10.4236/ns.2010.25051.
References
[1]   Langmuir, I. (1913) The effect of space charge and residual gases on thermionic currents in high vacuum. Physical Review, 2(6), 450-486.

[2]   Sudan, R.N. and Lovelace, R.V. (1973) Generation of intense ion beams in pulsed diodes. Physical Review Letters, 31(19), 1174-1177.

[3]   Dreike, P., Eichenberger, C., Humphries, S. and Sudan, R. (1976) Production of intense proton fluxes in a magneti-cally insulated diode. Journal of Applied Physics, 47(1), 85-88.

[4]   Humphries, S. (1977) Self magnetic insulation of pulsed ion diodes. Plasma Physics, 19(5), 399-406.

[5]   Logachev, E.I., Remnev, G.E. and Usov, Y.P. (1980) Ion acceleration from explosion-emissive plasma. Technical Physics Letters, 6(22), 1404-1406.

[6]   Logachev, E.I., Remnev, G.E. and Usov, Y.P. (1983) Generator of nanosecond pulsed. Soviet Patent SU 852149A.

[7]   Pushkarev, A.I., Tarbokov, V.A., Sazonov, R.V. and Isakov, I.F. (2009) Pulsed ion generator. Russian Patent RU 86374 U1.

[8]   Bystrickii, V.M. and Didenko, A.N. (1984) High-power ion beams. Energoatomizdat, Moscow.

[9]   Gordon, A.M. (2006) Ph.D. Dessertation, Tomsk Poly- technic University, Tomsk.

[10]   Hodgson, R.T., Baglin, J.E.E., Pal, R., Neri, J.M. and Hammer, D.A. (1980) Ion beam annealing of semicon-ductors. Applied Physics Letters, 37(2), 187-189.

[11]   Didenko, A.N., Kusnetsov, B.I. and Remnev, G.E. (1981) Proceedings of National Conference Application of Electron and Ion Technology in National Economy, Tbilisi.

[12]   Pushkarev, A.I. and Sazonov, R.V. (2009) Research of cathode plasma speed in planar diode with explosive emission cathode. IEEE Transactions on Plasma Science, 37(10), 1901-1907.

[13]   Xin, J.P., Zhu, X.P. and Lei, M.K. (2008) Initial plasma of a magnetically insulated ion diode in bipolar-pulse mode. Physics Plasmas, 15(12), 123101-123108.

[14]   Belomyttsev, S.Y., Korovin, S.D. and Pegel, I.V. (1999) Current in a high-current planar diode with a discrete emitting surface. Technical Physics, 44(6), 695-699.

[15]   Djogo, G. and Gross, J.D. (1997) Circuit modeling of a vacuum gap during breakdown. IEEE Transactions on Plasma Science, 25(4), 617-624.

[16]   Pushkarev, A.I. and Sazonov, R.V. (2008) A planar diode operating in the regime of limited electron emission. Technical Physics Letters, 34(4), 292-295.

[17]   Remnev, G.E., Isakov, I.F., Opekounov, M.S., Kotlya- revsky, G.I., Matvienko, V.M., et al. (1997) High-power ion sources for industrial application. Surface and Coatings Technology, 96(1), 103-109.

[18]   Remnev, G.E., Isakov, I.F., Opekounov, M.S., Matvienko, V.M., Pushkarev, A.I., et al. (1999) High Intensity pulsed ion beam sources and their industrial applications. Surface and Coatings Technology, 114(2-3), 206-212.

[19]   Pushkarev, A.I. (2008) Perveance of a planar diode with a multipoint cathode. Technical Physics, 53(3), 363-367.

[20]   Mesyats, G.A. (2000) Actons in vacuum discharge: Breakdown, the spark, and the ark. Nauka, Moscow.

[21]   Pushkarev, A.I. and Sazonov, R.V. (2007) Research of high-current pulsed electron beam energy distribution in depth of sheet of water. Bulletin of Tomsk Polytechnic University, 311(2), 47-50.

[22]   Mesyats, G.A. (2004) Pulsed power and electronics. Nauka, Moscow.

[23]   Shubin, A.F. and Yurike, Y.Y. (1975) Current rise in the initial stages of vacuum breakdown between plane ele- ctrodes with slowly increasing voltage. Russion Physics Journal, 18(6), 870-872.

 
 
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