Electrical breakdown of water in microgaps

Experimental and modeling studies on electrical breakdown in water in submillimeter gaps between pin and plane electrodes have been performed. Prebreakdown, breakdown and recovery of the water gaps were studied experimentally by using optical and electrical diagnostics with a temporal resolution on the order of one nanosecond. By using Mach–Zehnder interferometry, the electric field distribution in the prebreakdown phase was determined by means of the Kerr effect. Electric fields values in excess of the computed electric fields, which reach >4 MV cm−1 for applied electrical pulses of 20 ns duration, were recorded at the tip of the pin electrode, an effect which can be explained by a reduced permittivity of water at high electric fields. Breakdown of the gaps, streamer-to-arc transition, was recorded by means of high-speed electrical diagnostics, and through high-speed photography. It was shown, through simulations, that breakdown is initiated by field emission at the interface of preexisting microbubbles. Impact ionization within the micro-bubble's gas then contributes to plasma development. Experiments using pulse–probe methods and Schlieren diagnostics allowed us to follow the development of the disturbance caused by the breakdown over a time of more than milliseconds and to determine the recovery time of a water switch. In order to trigger water switches a trigger electrode with a triple point has been utilized. The results of this research have found application in the construction of compact pulse power generators for bioelectric applications.

[1]  James C. Dickens,et al.  Research issues in developing compact pulsed power for high peak power applications on mobile platforms , 2004, Proceedings of the IEEE.

[2]  Edl Schamiloglu,et al.  Microscopic analysis for water stressed by high electric fields in the prebreakdown regime , 2004 .

[3]  M. Laroussi,et al.  Electrical breakdown of submillimeter water gaps , 2002, 2002 14th International Conference on High-Power Particle Beams (BEAMS).

[4]  I. Danielewicz-Ferchmin,et al.  A phase transition in H2O due to a high electric field close to an electrode , 2002 .

[5]  O. Lesaint,et al.  On the relationship between streamer branching and propagation in liquids: influence of pyrene in cyclohexane , 2000 .

[6]  U. Pliquett,et al.  Nanosecond pulsed electric fields cause melanomas to self-destruct , 2006, Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium.

[7]  M. Laroussi,et al.  High power water switches: postbreakdown phenomena and dielectric recovery , 2004, IEEE Transactions on Dielectrics and Electrical Insulation.

[8]  A. Beroual,et al.  Modelling of multi-channel streamers propagation in liquid dielectrics using the computation electrical network , 2001 .

[9]  T. J. Lewis,et al.  The 1984 H. Tropper Memorial Lecture Electronic Ppocesses in Dielectric Liquids Under Incipient Breakdown Stress , 1985, IEEE Transactions on Electrical Insulation.

[10]  E. Schamiloglu,et al.  Microbubble-based model analysis of liquid breakdown initiation by a submicrosecond pulse , 2005 .

[11]  I. M. Gavrilov,et al.  Dynamics of prebreakdown phenomena in a uniform field in water , 1994 .

[12]  S. Xiao,et al.  Electrical breakdown of sub-millimeter water gaps , 2002, Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop..

[13]  K. Honda,et al.  Electrical breakdown mechanism of liquid nitrogen in the presence of thermally induced bubbles , 1987 .

[14]  T. V. Blalock,et al.  Possible models for the earliest prebreakdown events in DC stressed hexane , 1990, 10th International Conference on Conduction and Breakdown in Dielectric Liquids.

[15]  E. Schamiloglu,et al.  Electrical Breakdown and Dielectric Recovery of Propylene Carbonate , 2006, IEEE Transactions on Plasma Science.

[16]  H. M. Jones,et al.  Pulsed dielectric breakdown of pressurized water and salt solutions , 1995 .

[17]  H. Bluhm,et al.  Underwater streamer propagation analyzed from detailed measurements of pressure release , 2007 .

[18]  K. Schoenbach,et al.  Electrical and optical characteristics of water under high electric stress , 2002, Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop..

[19]  H. Akiyama.  Streamer discharges in liquids and their applications , 2000 .

[20]  M. Kristiansen,et al.  The Impact of Field Enhancements and Charge Injection on the Pulsed Breakdown Strength of Water , 2006, IEEE Transactions on Plasma Science.

[21]  Laura Marcu,et al.  Pulse generators for pulsed electric field exposure of biological cells and tissues , 2003 .

[22]  E. Schamiloglu,et al.  Water and propylene carbonate as storage and switching media in pulsed power systems , 2003, Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472).

[23]  J. Lott,et al.  Multimegavolt Laser-Triggered Gas Switching With a Green Laser and Beam Transport Through Water , 2007, IEEE Transactions on Plasma Science.

[24]  F. V. Bunkin,et al.  Bubbstons : stable microscopic gas bubbles in very dilute electrolytic solutions , 1992 .

[25]  Olivier Lesaint,et al.  Positive streamer propagation in large oil gaps: experimental characterization of propagation modes , 1998 .

[26]  Kunhardt Ee.  Electron kinetics in simple liquids at high electric fields , 1991 .

[27]  E. Schamiloglu,et al.  Are microbubbles necessary for the breakdown of liquid water subjected to a submicrosecond pulse , 2004 .

[28]  Juergen F Kolb,et al.  Nanosecond pulsed electric field generators for the study of subcellular effects , 2006, Bioelectromagnetics.

[29]  Karl H. Schoenbach,et al.  Parallel streamer discharges between wire and plane electrodes in water , 2002 .

[30]  Christos G. Christodoulou,et al.  Percolative model of electric breakdown in liquid dielectrics , 2002 .

[31]  W. G. Chadband,et al.  The ubiquitous positive streamer , 1987, 1987 Ninth International Conference on Conduction and Breakdown in Dielectric Liquids.

[32]  S. Xiao,et al.  Compact, Nanosecond, High Repetition Rate, Pulse Generator for Bioelectric Studies , 2007, IEEE Transactions on Dielectrics and Electrical Insulation.

[33]  I. Vitkovitsky.  High power switching , 1987 .

[34]  J. Qian,et al.  Model analysis of breakdown in high-voltage, water-based switches , 2003, Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472).

[35]  Olivier Lesaint,et al.  Positive streamer propagation in large oil gaps: electrical properties of streamers , 1998 .

[36]  Shu Xiao,et al.  Bioelectric Effects of Intense Nanosecond Pulses , 2007, IEEE Transactions on Dielectrics and Electrical Insulation.

[37]  M. Kincy,et al.  Optical and pressure diagnostics of 4-MV water switches in the Z-20 test Facility , 2004, IEEE Transactions on Plasma Science.

[38]  J. C. Devins,et al.  Breakdown and prebreakdown phenomena in liquids , 1981 .

[39]  Ravindra P. Joshi,et al.  Analysis of polarity effects in the electrical breakdown of liquids , 2005 .

[40]  S. Xiao,et al.  High power, high recovery rate water switch , 2003, Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472).

[41]  John H Ashmore,et al.  Characterization of the cytotoxic effect of high-intensity, 10-ns duration electrical pulses , 2004, IEEE Transactions on Plasma Science.