Electrodynamic simulations of a photoconductively switched high voltage spark gap

Hendriks, J Jimi; Geer, van der Sb Bas; Brussaard, Gjh Seth

doi:10.1088/0022-3727/38/16/009

Cited by 11 publications

(11 citation statements)

References 15 publications

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“…To study the dependence of rise time on various switch parameters, the fifth-order model for the output voltage is approximated to second order by neglecting the peaking capacitance value Cp and considering the voltage across the peaking capacitor V Cp and given by (12). The natural frequency of oscillation ω n and the damping coefficient ξ obtained from (12) is given in (13) and (14), respectively, using which the real and imaginary parts of damped frequency of oscillations are computed from (15) and (16) V LOAD (s) The time taken to reach the peak value (T p ) is then given by…”

Section: B Network Equations and Transfer Function Modelmentioning

confidence: 99%

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Development of Transfer Function Model and Analysis of the Peaking Capacitor and Switch

Bindu¹,

Mangalvedekar²,

Sharma

et al. 2013

IEEE Trans. Plasma Sci.

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This paper discusses the development and analysis of a transfer function model of the peaking capacitor and peaking switch for an input from Marx generator and an output across load. The effect of variations of gap distance, pressure, peaking capacitor, and the input pulse rise time on the rise time of the output pulse is simulated using this model. For a given geometry, the modeling gives an optimum input pulse rise time and the effect of variation of peaking capacitor on various output parameters. The results obtained from modeling are validated with the experimental results.

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Section: B Network Equations and Transfer Function Modelmentioning

confidence: 99%

“…Niayesh et al [14] used mathematical modeling to simulate the low-pressure breakdown under different electrode geometries. Manuscript Hendriks et al [15] and Ryu et al [16] used computer simulation techniques for the purpose of dynamic simulation of the switch. Wang et al [17] used ANSYS software for electrodynamic modeling.…”

Section: Introductionmentioning

confidence: 99%

Development of Transfer Function Model and Analysis of the Peaking Capacitor and Switch

Bindu¹,

Mangalvedekar²,

Sharma

et al. 2013

IEEE Trans. Plasma Sci.

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“…The cathode fall formation time is also much shorter than the rise time of the electric field in the gap due to the geometry, which is a few tens of picoseconds. 13 Hence, the cathode fall formation time has no influence on the rise time of the switched pulse.…”

Section: B the Cathode Fall Formation Timementioning

confidence: 99%

“…In Ref. 13, it has been determined that it takes several tens of picoseconds for the electric field in the spark gap to stabilize. In the model, we approximate this by using to describe the instantaneous value of I.…”

Section: The Currentmentioning

confidence: 99%

Theoretical investigation of a photoconductively switched high-voltage spark gap

Broks

Hendriks

Brok

et al. 2006

Journal of Applied Physics

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In this contribution, a photoconductively switched high-voltage spark gap with an emphasis on the switching behavior is modeled. It is known experimentally that not all of the voltage that is present at the input of the spark gap is switched, but rather a fraction of it drops across the spark gap. This voltage drop depends on the voltage that is present at the input of the spark gap with higher voltages resulting in a smaller drop. We have investigated two possible causes of this: the cathode fall and the resistance of the plasma arc. Using an analytical model of the cathode fall, we have established that the cathode fall can be excluded as the cause of the observed voltage drop. A one-dimensional, time-dependent non-local thermal equilibrium fluid model of the arc plasma has been made. Using this model, the plasma properties have been analyzed for various values of the switched current with emphasis on the conductivity. A good qualitative match between the observed and the simulated dissipation in the gap was found. This indicates that the finite arc resistance is the cause of the observed voltage drop.

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“…Because plasma processes are no longer determining the rise time at photoconductive switching, we needed a model that was able to visualize the effects of the electrodynamic details of the switching process. For this we developed a full threedimensional electromagnetic spark gap model that simulates complete electromagnetic field-propagation in the switched gap and is able to predict rise times for different spark gap geometries [11].…”

Section: Introductionmentioning

confidence: 99%

Spark gap optimization by electrodynamic simulations

Hendriks¹,

Geer²,

Brussaard³

2006

J. Phys. D: Appl. Phys.

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When switching times are no longer dominated by the plasma formation time, such as for photoconductive switching of high-voltage spark gaps, electrodynamic details of the switching process determine the rise time and pulse shape of the switched pulse. We show that the commonly used zero-dimensional lumped element and one-dimensional transmission line theory are no longer sufficient for optimizing such fast-switching devices, because important electromagnetic-field propagation in three dimensions is neglected. In order to improve the output of the photoconductively switched spark gap, we developed an optimization procedure for spark gap geometries based on full three-dimensional electrodynamic simulations. By monitoring the electromagnetic-field propagation in time, it will be shown that the initial electromagnetic-field disturbance in the gap reflects at the outer conductor and interferes with the initial field. The reflection and interference are essential for the shape of the output signal. We propose the following optimization procedure to improve the output of the photoconductively switched coaxial spark gap. Initially, the reflection and interference can be influenced by reshaping the inner conductor. The outer conductor can be used to fine-tune the system to get an output pulse with a sharp rising edge and no significant oscillations. We also present the optimal spark gap geometry that gives the best output signal at photoconductive switching.

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Electrodynamic simulations of a photoconductively switched high voltage spark gap

Cited by 11 publications

References 15 publications

Development of Transfer Function Model and Analysis of the Peaking Capacitor and Switch

Development of Transfer Function Model and Analysis of the Peaking Capacitor and Switch

Theoretical investigation of a photoconductively switched high-voltage spark gap

Spark gap optimization by electrodynamic simulations

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