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Impedance matching condition analysis of the multi-filar tape-helix Blumlein PFL with discontinuous dielectrics

Published online by Cambridge University Press:  16 October 2012

Y. Zhang  and
J.L. Liu
Y. Zhang
Affiliation:
College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha, China
J.L. Liu*
Affiliation:
College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha, China
*
Address correspondence and reprint requests to: Jinliang Liu, College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha, 410073. E-mail: [email protected]
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Abstract

In this paper, the characteristic impedance matching of the inner line and outer line of the multi-filar tape-helix Blumlein pulse forming line (BPFL) is analyzed in detail by dispersion theory of tape helix. Analysis of the spatial harmonics of multi-filar tape-helix BPFL shows that the integer harmonic numbers of the excited spatial harmonics are not continuous. In addition, the basic harmonic component still dominates the dispersion characteristics of the multi-filar tape-helix BPFL at low frequency band. The impedance mismatching phenomenon caused by the discontinuity of filling dielectrics in the inner line of BPFL is studied as an important issue. Effects of dielectric discontinuity on the coupled electromagnetic fields and the parameters of the outer line are also analyzed. The impedance matching conditions are both obtained under the situations of continuous filling dielectric and discontinuous dielectrics, respectively. Impedance characteristics of these two situations are analyzed by comparison, and effects of the thickness of support dielectric on the impedance are also presented. When the 6 mm-thickness nylon support of the multi-filar tape helix is used in the filling dielectric of de-ionized water, the characteristic impedances of the inner line and outer line of BPFL are 53 Ω and 14.7 Ω, respectively. After the improvement about substituting de-ionized water by castor oil, the relative permittivities of the support dielectric and filling dielectric are almost the same, and the impedances of the inner and outer line of BPFL become 80 Ω and 79 Ω, respectively. That is to say, the impedance mismatching problem caused by dielectric discontinuity is solved. Circuit simulation and experimental results basically correspond to the theoretical results, and the fact demonstrates that impedance analysis of the multi-filar tape-helix BPFL based on dispersion theory is correct.

Keywords

BPFLDielectric discontinuityDispersion theoryImpedance matchingMulti-filarSpatial harmonicsTape helix
Type
Research Article
Information
Laser and Particle Beams , Volume 30 , Issue 4 , December 2012 , pp. 639 - 650
Copyright
Copyright © Cambridge University Press 2012

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References

REFERENCES

Cheng, X.B., Liu, J.L., Qian, B.L. & Zhang, J.D. (2009). Effect of transition section between the main switch and middle cylinder of Blumlein pulse forming line on the diode voltage of intense electron-beam accelerators. Laser Part. Beams 27, 439–447.CrossRefGoogle Scholar
Cheng, X.B., Liu, J.L. & Zhang, Y. (2009). Effect of a transition section between the Blumlein line and a load on the output voltage of gigawatt intense electron-beam accelerators. Phys. Rev. 12, 110401.Google Scholar
Hartmann, W., Roemheld, M., Rohde, K.D. & Spiess, F.J. (2009). Large area pulsed corona discharge in water for disinfection and pollution control. IEEE Trans. Dielectr. Electr. Insul. 16, 1061–1065.CrossRefGoogle Scholar
Hegeler, F., McGeoch, M.W., Sethian, J.D., Sanders, H.D., Glidden, S.C. & Myers, M.C. (2011). A durable gigawatt class solid state pulsed power system. IEEE Trans. Dielectr. Electr. Insul. 18, 1205–1213.CrossRefGoogle Scholar
Johnson, H.R., Everhart, T.E. & Siegman, A.E. (1956). Wave propagation on multifilar helices. IEEE Trans. Dielectr. Electr. 2, 18–24.Google Scholar
Kino, G.S. & Paik, S.F. (1962). Circuit theory of coupled transmission system. J. Appl. Phys. 33, 3002–3008.CrossRefGoogle Scholar
Kogelschatz, U. (2003). Dielectric-barrier discharges: Their history, discharge physics, and industrial applications. Plasma Chem. Plasma Proces. 23, 41–46.CrossRefGoogle Scholar
Kompfner, R. (1947). Traveling wave tube as amplifier at microwaves. I. R. E. 35, 124–127.Google Scholar
Korovin, S.D., Kurkan, I.K., Loginov, S.V., Pegel, I.V., Polevin, S.D., Vollkov, S.N. & Zherlitsyn, A.A. (2003). Decimeter-band frequency-tunable sources of high-power microwave pulses. Laser Part. Beams 21, 175–185.CrossRefGoogle Scholar
Laroussi, M. (2005). Low temperature plasma-based sterilization: overview and state-of-the-art. Plasma Proc. Poly. 5, 391–400.CrossRefGoogle Scholar
Lewis, I.A.D. & Wells, F.H. (1959). Millimicrosecond Pulse Techniques. London: Pergarnon Press.Google Scholar
Liu, J.L., Cheng, X.B. & Qian, B.L. (2009). Study on strip spiral Blumlein line for the pulsed forming line of intense electron-beam accelerators. Laser Part. Beams 27, 95–105.CrossRefGoogle Scholar
Liu, J.L., Li, C.L. & Zhang, J.D. (2006). A spiral strip transformer type electron-beam accelerator. Laser Part. Beams 24, 355–358.CrossRefGoogle Scholar
Liu, J.L., Yin, Y. & Ge, B. (2007 a). An electron-beam accelerator based on spiral water PFL. Laser Part. Beams 25, 593–599.CrossRefGoogle Scholar
Liu, J.L., Zhan, T.W. & Zhang, J. (2007 b). A Tesla pulse transformer for spiral water pulse forming line charging. Laser Part. Beams 25, 305–312.CrossRefGoogle Scholar
Mesyats, G.A., Korovin, S.D. & Rostov, V.V. (2004). The RADAN series of compact pulsed power generators and their applications. IEEE 92, 1166–1179.CrossRefGoogle Scholar
Panousis, E., Merbahi, N., Clement, F., Yousfi, M., Loiseau, J.F., Eichwald, O. & Held, B. (2009). Analysis of dielectric barrier discharges under unipolar and bipolar pulsed excitation. IEEE Trans. Dielectr. Electr Insul. 16, 734–741.CrossRefGoogle Scholar
Sensiper, S. (1951). Electromagnetic Wave Propagation on Helical Conductors. Report No. 194. Cambridge: MIT.Google Scholar
Sensiper, S. (1955). Electromagnetic wave propagating on helical structures: a review of survey of recent progress. I.R.E. 43, 149–161.Google Scholar
Sethian, J.D., Myers, M. & Giuliani, J.L. (2005). Electra: A repetitively pulsed, electron beam pumped KrF laser to develop the technologies for fusion energy. IEEE Pulsed Power Conference, 8–15.CrossRefGoogle Scholar
Shimomura, N., Nakano, K., Nakajima, H., Kageyama, T. & Teranishi, K. (2011). Nanosecond pulsed power application to nitrogen oxides treatment with coaxial reactors. IEEE Trans. Dielectr. Electr. Insul. 18, 1274–1280.CrossRefGoogle Scholar
Sichak, M. (1954). Coaxial line with helical inner conductor. I. R. E. 42, 1315–1319.Google Scholar
Teranishi, T., Nojima, K. & Motegi, S. (1991). A 600 kV Blumlein modulator for an X-band klystron. IEEE Pulsed Power Conference, 315–318.CrossRefGoogle Scholar
Tien, P.K. (1954). Bifilar helix for backward-wave oscillators. I.R.E. 42, 1137–1142.Google Scholar
Zhan, H., Li, C. & Xu, J.B. (2007). Homogeneous dielectric barrier discharge in air for surface treatment. Annual conference on Electric Insulation and Dielectric Phenomena, 683–686.Google Scholar
Zhang, Y., Liu, J.L., Fan, X.L., Zhang, H.B., Wang, S.W. & Feng, J.H. (2011 a). Characteristic impedance and capacitance analysis of Blumlein type pulse forming line of accelerator based on tape helix. Rev. Sci. Instr. 82, 104701.CrossRefGoogle ScholarPubMed
Zhang, Y., Liu, J.L., Wang, S.W., Fan, X.L., Zhang, H.B. & Feng, J.H. (2011 b). Effects of dielectric discontinuity on the dispersion characteristics of the tape helix slow-wave structure with two metal shields. Laser Part. Beams 29, 459–469.CrossRefGoogle Scholar
Zhang, Y., Liu, J.L. & Feng, J.H. (2012). Effects of dispersion on electromagnetic parameters of tape-helix Blumlein pulse forming line of accelerator. Euro. Physical J. Appl. Phys. 57, 30904.CrossRefGoogle Scholar