Electra: A Repetitively Pulsed, Electron Beam Pumped KrF Laser to Develop the Technologies for Fusion Energy

Sethian, J. D.; Myers, M. C.; Giuliani, J. L.; Hegeler, F.; Friedman, M.; Wolford, M. F.; Rose, D. V.; Weidenheimer, D.; Morton, David W.; Giorgi, D.

doi:10.1109/ppc.2005.300463

Cited by 6 publications

(4 citation statements)

References 29 publications

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“…From (23), α u(m−1) = ξ u(m−1) + 1, which corresponds with the results from (18). As (20) and (23) are obtained under low frequency conditions, the proposed dispersive propagation theory corresponds to the classical non-dispersive propagation theory.…”

Section: Transmission Characteristics Of Electromagnetic Waves Under supporting

confidence: 72%

“…Helical transmission line is a kind of important transmission line including helical coils as the slowwave structure, in which the phase velocities of waves can be slowed down [19]. Helical transmission line and helical coils have been widely employed in power pulse forming [14,20,21], high-power microwave radiation [22], high-power laser pump [23], electromagnetic pulse radiation [24], X-ray radiography, processing of industrial exhaust gas and water, food sterilization and biomedical applications [25].…”

Section: Introductionmentioning

confidence: 99%

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Dispersion and Dielectric Effects on Reflection and Transmission of Electromagnetic Waves Propagating in Multiple Stages of Tape-Helix Blumlein Transmission Lines

Liu¹

2013

PIER

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Abstract-Tape-helix transmission lines and helical coils have important applications in communication technology, signal measurement, pulse delay, pulse forming and antenna technology. In this paper, a set of fully dispersive propagation theory based on matrix method is firstly introduced to explain the propagation characteristics of travelling electromagnetic waves in multiple stages of helical Blumlein transmission lines with finite lengths. The different stages of helical transmission lines are filled with different propagation dielectrics, and the effects of dispersion and dielectrics on the propagation matrix and S-parameter matrix of the travelling waves are analyzed in detail. Relations of the exciting current waves in the series-connected helical Blumlein transmission lines are studied, and the dispersive transmission coefficients and reflection coefficients of electromagnetic waves at different dielectric ports are also initially analyzed. As an innovation, the proposed fully dispersive propagation theory which was demonstrated by simulation and experiments can substitute the non-propagating tape-helix dispersion theory and the non-dispersive telegraphers' equation to analyze the helical transmission lines.

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Section: Transmission Characteristics Of Electromagnetic Waves Under supporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Dispersion and Dielectric Effects on Reflection and Transmission of Electromagnetic Waves Propagating in Multiple Stages of Tape-Helix Blumlein Transmission Lines

Liu¹

2013

PIER

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“…Nanoseconds and sub-nanoseconds pulses have been widely used in many areas because of very wide spectrum, such as Ground-Peneatrating Radar (GPR) [1] , See-Through-Wall Radar System [2] , Biomedical applications [3] , High-speed photography [4] , Ultra-wideband communications [5] and Laser Technology [6] . Therefore, high-voltage and high-speed pulse source has drawn lots of attention.…”

Section: Introductionmentioning

confidence: 99%

High power pulse generator based on avalanche transistor Marx circuit

Huang

Chen

et al. 2014

2014 IEEE International Conference on Communiction Problem-Solving

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Marx bank pulse circuit based on avalanche transistors can generate high amplitude, high-repetition-rate and low-jitter ultra-wideband pulses. The rising edge of the pulse is determined mainly by the performance of avalanche transistors. The amplitude of the pulse can be adjusted by changing the number of stage and the value of charging capacitors. In this paper, A 25 stages Marx bank pulse circuit is designed and tested, In order to reduce the jitter of the output pulses, an optimized driver circuit is designed and the charging resistors and capacitors are tuned to achieve a higher amplitude. Finally, 2.7 kV peak voltage of the output pulse is obtained, the FWHM is 1 ns, the maximum repetition rate is 10 kHz.

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“…Tape-helix type high power pulse accelerator is in hot applications in the fields of high power microwave radiation (Korovin et al, 2003), high power pulse laser (Sethian et al, 2005;Hegeler et al, 2011), X-ray radiography (Mesyats et al, 2004), dielectric barrier discharge (Panousis et al, 2009), processing of industrial exhausted water and gas (Shimomura et al, 2011;Hartmann et al, 2009 ), material surface processing (Zhan et al, 2007), ozone production (Kogelschatz et al, 2003), food sterilization (Laroussi et al, 2005), and underwater electrical wire explosion. In order to obtain load voltage pulse with amplitude as the charging voltage, the Blumlein type pulse forming line (PFL) is in common use (Teranishi et al, 1991;Liu et al, 2006;Liu et al, 2007;Liu et al, 2007;Liu et al, 2009;Cheng, Liu, Qian, et al, 2009;.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Liu

2012

Laser Part. Beams

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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.

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Electra: A Repetitively Pulsed, Electron Beam Pumped KrF Laser to Develop the Technologies for Fusion Energy

Cited by 6 publications

References 29 publications

Dispersion and Dielectric Effects on Reflection and Transmission of Electromagnetic Waves Propagating in Multiple Stages of Tape-Helix Blumlein Transmission Lines

Dispersion and Dielectric Effects on Reflection and Transmission of Electromagnetic Waves Propagating in Multiple Stages of Tape-Helix Blumlein Transmission Lines

High power pulse generator based on avalanche transistor Marx circuit

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

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