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LLAMPÜDKEÑ: A high-current, low-impedance pulser employing an auxiliary exponential transmission line

Published online by Cambridge University Press:  09 March 2009

H. Chuaqui ,
E. Wyndham ,
C. Friedli  and
M. Favre
H. Chuaqui
Affiliation:
Pontificia Universidad Cató1ica de Chile, Casilla 306, Santiago 22, Chile
E. Wyndham
Affiliation:
Pontificia Universidad Cató1ica de Chile, Casilla 306, Santiago 22, Chile
C. Friedli
Affiliation:
Pontificia Universidad Cató1ica de Chile, Casilla 306, Santiago 22, Chile
M. Favre
Affiliation:
Pontificia Universidad Cató1ica de Chile, Casilla 306, Santiago 22, Chile
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Abstract

The design and constructional aspects of a novel pulse power generator for use in dense plasma research presently under construction are presented. The generator consists of two Marx capacitor banks, each of 0.25 μF, 480 kV, and 28.8 kJ. Each Marx generator drives a water transmission line, in which the live electrode is the central conductor. The transmission lines consist of a constant impedance section followed by a multielectrode gas linegap followed by an exponential taper to the load section. The novel feature is the use of an auxiliary exponential line coupled at the load. This line controls both the voltage and the effective impedance at the load section. In addition, by leaving this line circuit open, energy not coupled to the plasma in the initial high-impedance phase may be reflected back and deposited into the discharge, increasing the peak current by 50%. Circuit simulations using a real-time-varying load impedance show that the current pulse rises in an approximately linear way to a maximum of 1.2 MA at 250 ns. The current falls to zero in the following 250 ns. The current waveform may be flattened simply by disconnecting the auxiliary line, giving a rectangular pulse of 350 ns with a maximum value of 950 kA. The overall impedance of the entire system may be adjusted by varying the separation between the conductors. The equivalent source impedance at the load is 0.8 Ω. This low value is by virtue of the auxiliary line, which limits the voltage at the load section and reduces the insulator constraints. We present simulations of the generator under real load conditions. The model also is checked against analytical solutions of exponential line behavior and against other published models of pulse power generators.

Type
Regular Papers
Information
Laser and Particle Beams , Volume 15 , Issue 2 , June 1997 , pp. 241 - 248
Copyright
Copyright © Cambridge University Press 1997

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References

REFERENCES

Alfvén, H. & Smars, E. 1960 Nature 188, 801.CrossRefGoogle Scholar
Alfvén, H. et al. 1982 Los Alamos National Laboratory Report LA-93333-T, Los Alamos, NM.Google Scholar
Burrows, C.R. 1938 Bell Syst. Tech. J., 17, 555.CrossRefGoogle Scholar
Camarcat, N. et al. 1985 Laser Part. Beams 3, 415.Google Scholar
Chuaqui, H. et al. 1994 Proc. 1994 Int. Conf. on Plasma Physics, Vol. 1, Contributed Papers (Iguazu Falls, Brazil), pp. 1–153.Google Scholar
Chuaqui, H. et al. 1995 Phys. Plasmas 2, 3910.Google Scholar
Martin, J.C. 1970 AWRE Report SSWA/JCM/704/49, United Kingdom.Google Scholar
Nagel, L.W. 1975 Memo #ERL-M520, U. California, May.Google Scholar
Soto, L. et al. 1992 Proc. V Latin American Workshop on Plasma Physics, Vol. 1, Contributed Papers, p. 63.Google Scholar
Soto, L. et al. 1994 Phys. Rev. Lett. 72, 2891.CrossRefGoogle Scholar
Vladimrescu, A. et al. 1981 Spice Version 2G.2 User's Guide, Electronics Research Lab., U. of California, Berkeley.Google Scholar