I.V. Lisitsyn

Kumamoto University, Kumamoto-shi, Kumamoto Prefecture, Japan

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Publications (37)35.55 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The repetitive pulsed power generator was constructed with the semiconductor opening switch realizing the pulse compression by an inductive energy storage system. For the preliminary pulse compression, the magnetic pulse compression system was employed. The saturable inductors and transformers were used to transfer the electrical energy from the primary storage capacitor to the load compressing the pulse. For the final output of the generator, the semiconductor opening switch (SOS) was used. The SOS assembly used in the system consists of 80 diodes that were designed to conduct high reverse current and have short reverse recovery time. By tuning the current fed to the SOS, the amplitude and pulse width of the generated voltage at the 300 Ω resistive load were 150 kV and 60 ns, respectively. Although the present generator system operates repetitively, the system has no triggered gas-discharge or semiconductor closing switch. Also, all the devices used in the system are in solid sate. The system provides stable operation and long lifetime. © 2001 American Institute of Physics.
    Review of Scientific Instruments 11/2001; 72(12):4464-4468. · 1.60 Impact Factor
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    ABSTRACT: The repetitive pulsed power generator was constructed with the semiconductor opening switch (SOS) realizing the pulse compression by inductive energy storage scheme. For the preliminary pulse compression, the magnetic pulse compression system was employed. The saturable inductors and transformers transferred the stored electrical energy from the primary storage capacitor to the SOS compressing the pulse. For the final stage of the generator, the SOS was used. At the time when the SOS interrupts the current, the inductive energy stored in the circuit inductance is quickly released and transferred to the load. By tuning the current fed to the SOS, the amplitude and pulse width of the generated voltage at the 300-Ω resistive load were 150 kV and 60 ns, respectively. The SOS allows the decrease in size, hence cost of the generator, and improves the reproducibility and reliability under the repetitive operation. Moreover, the system does not require gas discharge-based spark-gap switches or semiconductor closing switches accompanying an external trigger source, and can operate at 60 pps. Such all solid configuration and exclusion of possibility of miss-firing provide easy-to-use generator system and long lifetime.
    Pulsed Power Plasma Science, 2001. PPPS-2001. Digest of Technical Papers; 02/2001
  • H. Inoue, I.V. Lisitsyn, H. Akiyama, I. Nishizawa
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    ABSTRACT: The drilling and demolition by low-duration, high-voltage electric pulses is based on the fact that, for very short times, the breakdown inside the solid dielectric occurs faster than the surface flashover benveen the electrodes. It was shown that most solid dielectrics could be broken down in insulating liquids, such as transformer oil, diesel fuel, and even in water. This study includes experimental and theoretical results on the drilling of rocks in insulating liquids, including transformer oil and diesel fuel.
    IEEE Electrical Insulation Magazine 06/2000; · 1.32 Impact Factor
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    ABSTRACT: B. Stearothermophilus remains alive even under intense electric field, since spores formed are highly resistant to damage from electric field effects. This paper describes the effects of pulsed electric field on B. Stearothermophilus (ATCC no, 12980). An aqueous suspension of B. Stearothermophilus spores was placed between parallel planar electrodes and subjected to pulsed electric fields of up to 189 kV/cm, which are obtained from a high-voltage pulsed voltage generator. Either a Blumlein generator or a magnetic compression circuit with a semiconductor opening switch was used as the pulsed voltage generator. The spores that survived the treatment were detected by a colony counting method. The growth activities were measured using a microbial calorimetry technique. The temperature and pH of the spore suspension remained unchanged during the treatment. It was found that the growth activity of B. Stearothermophilus was affected by the pulsed electric field. while no remarkable lethal effect was observed in the range of up to 40 kV/cm
    IEEE Transactions on Plasma Science 03/2000; · 0.87 Impact Factor
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    ABSTRACT: Summary form only given. Recent advantages in the pulsed power have opened a new field of bio- and chemical electronics. Nonthermal plasmas using streamer discharges in gases have found an extensive use for flue gas cleaning and ozone generation. The recent extension in the use of such discharges in a liquid medium such as water and sewage offers new and promising ecological applications of pulsed electric power. The discharges in water and aqueous solutions are efficient in the creation of a variety of effects as shock waves, ultraviolet radiation, high electric fields, and especially formation of chemically active species acting on biological cells and chemical compounds dissolved in water. The studies of the water treatment by streamer discharges have been carried out usually in rod-to-plane electrode configuration and recently in disk-to-ring one. In order to achieve the high efficient water treatment, the production of a large volume streamer discharges has been requested. In this study, streamer discharges with a large volume are produced successfully, and those are applied to the treatment of surplus sludge. Two kinds of electrode configurations were used such as the rod and cylindrical electrodes with a length of 15 cm, an inner diameter of 9 cm and a rod diameter of 1 mm, and the rod and plane electrodes with a length of 15 cm and gap separations of 25, 35, 45, 55 mm
    Plasma Science, 2000. ICOPS 2000. IEEE Conference Record - Abstracts. The 27th IEEE International Conference on; 02/2000
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    ABSTRACT: A novel pulsed power generator using inductive voltage adder technology has been put into operation in Kumamoto University. This machine, named ``ASO-X'', is an inductive voltage adder-inductive energy storage pulsed power system. The maximum output voltage and current of ASO-X are 180 kV and 400 kA, respectively, into a short circuit load with a current quarter period of 1.3 mus. In order to increase the voltage and power and to decrease the rise time of the load current, a plasma opening switch is used at the output of ASO-X@. Eight plasma guns serve as the plasma source for the opening switch in a circuit with a single triggered spark-gap switch. This system provides a very fast current rise rate (3.6× 1012 A/s) and over 1 mus of conduction time of the plasma opening switch.
    Japanese Journal of Applied Physics 01/2000; 39:2829-2833. · 1.07 Impact Factor
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    ABSTRACT: The characteristics of a microsecond plasma opening switch have been improved by the modification of the plasma source. Conventional cable plasma guns have been used in the experiments, producing different directions of the plasma flow by changing the guns’ nozzles. The nozzles were arranged to provide the plasma flow, which is not exactly radial, but has an angle to the gun axis. The experiments with the modified plasma guns were carried out with the upstream, downstream, and azimuthally slanted plasma flow directions. The results are compared to a conventional radial flow plasma source. The plasma flow slanted in an angle of 30° downstream resulted in 50% improvement of the load current rise time and switch impedance. The obtained dependencies are explained in the frame of the snowplow model. Radial component of the plasma velocity at the end of the conduction phase is higher for downstream plasma flow. This results in a faster opening of the switch and is in good agreement with experimental data. © 1999 American Institute of Physics.
    Physics of Plasmas 07/1999; 6(8):3416-3421. · 2.38 Impact Factor
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    ABSTRACT: The characteristics of a plasma generated by cable plasma guns have been studied by a laser interferometer. Cable plasma guns are frequently used as a plasma source in plasma opening switches. In our experiments, the plasma source consists of eight coaxial cable guns mounted on the outer electrode of concentric coaxial electrodes. The reproducibility of the gun in subsequent shots is found to be better than 10%, and the gun-to-gun difference is less than 15%. Assuming a symmetry of eight guns, the contour maps of the electron plasma density are plotted as functions of time. The plasma density becomes maximum near the gun nozzle and near the inner coaxial electrode. The plasma density is low in the area between the coaxial electrodes during the early time of the discharge. At a later time, the plasma fills the space between the two guns more uniformly. Still photographs of the plasma luminosity show a good correspondence with the plasma density plots which were taken 10 μs after the discharge initiation. The plasma gun system is designed for use in a 400-kA inductive voltage adder with the inductive energy storage system
    IEEE Transactions on Plasma Science 07/1999; · 0.87 Impact Factor
  • I.V. Lisitsyn, H. Nomlyama, S. Katsuki, H. Akiyama
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    ABSTRACT: The propagation features of a streamer discharge in water have been investigated. Based on the experimental data obtained in the study of water discharges in a nonuniform electric field, due propagation of streamers is explained as the evaporation of water at the tip of the streamer and around it. The energy balance in the process of the streamer propagation is calculated for a sub-microsecond discharge in distilled water. It is shown that the energy released in the pre-breakdown process is sufficient to evaporate the liquid in the streamer channels. Similar velocity of the streamer propagation in both tap and distilled water substantiates negligible effect of ionic current density onto the streamer propagation process. These estimations, based on experiment, have relevance to the discussion of the nature of the dielectric breakdown of water
    IEEE Transactions on Dielectrics and Electrical Insulation 07/1999; · 1.36 Impact Factor
  • Igor V. Lisitsyn, Sunao Katsuki, Hidenori Akiyama
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    ABSTRACT: A two-dimensional implosion of liners is studied. This is instead of the conventional one-dimensional cylindrical implosion of Z pinches, where there is a wire array or a gas-puff liner, which has a cylindrical shape and an uniform mass distribution along the z axis. Two-dimensional Z-pinch compression can be realized utilizing either a spherically shaped wire array or a double gas-puff liner with a special mass distribution along the z-axis. The results obtained from computer simulations show that both kinds of liners can be compressed in both the z and the r directions. This results in a uniform and a high-power heating of the spherical dynamic hohlraum placed inside the liner. The spherical, two-dimensional liner implosion increases the power density at the hohlraum surface, improves the symmetry of the capsule irradiation and helps partially in quenching of the Rayleigh–Taylor instability. © 1999 American Institute of Physics.
    Physics of Plasmas 04/1999; 6(5):1389-1392. · 2.38 Impact Factor
  • I.V. Lisitsyn, H. Inoue, S. Katsuki, H. Akiyama
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    ABSTRACT: An inductive energy storage switch system for the destruction of solid materials is reported. This is based on creating a pulsed electric breakdown in the solid dielectric, which then propagates in the specimen. This scheme provides a higher destruction effectiveness compared to a capacitive energy storage system. The higher energy efficiency is attributed to a different discharge behavior during the discharge build-up in the solid material. A higher applied voltage causes a breakdown of a larger number of voids in a heterogeneous solid dielectric. The energy transfer to partial discharges, when using the inductive storage system, is faster than for the capacitive energy storage system, due to a shorter risetime of the discharge current
    IEEE Transactions on Dielectrics and Electrical Insulation 03/1999; · 1.36 Impact Factor
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    ABSTRACT: Spatial distribution of the incident gas significantly influences the pinch process in gas-puff Z pinch schemes. This paper shows the dependence of the plasma formation on the distribution of the gas puffed into the discharge region. Temporary and spatially resolved gas density between the Z-pinch electrodes was measured by using a high-sensitive multi-channel laser interferometer. Also, plasma density distribution was measured by using a pulsed laser interferometer. The gas, which was puffed from the anode nozzle toward the center axis, quickly spread out to the radial direction and formed a conical shape. This resulted in the significant gas density gradient along z-axis. The pulsed laser interferometer showed a discharge took place at the contour of the gas distribution. The pinch process was significantly influenced by the initial gas distribution. In addition, the double layer structure was observed before implosion
    Pulsed Power Conference, 1999. Digest of Technical Papers. 12th IEEE International; 02/1999
  • I.V. Lisitsyn, S Katsuki, H Akiyama
    [Show abstract] [Hide abstract]
    ABSTRACT: Summary form only given. A two-dimensional implosion of liners is studied. This is instead of the conventional one-dimensional cylindrical implosion of Z pinches where a wire array or a gas-puff liner, which has a cylindrical shape and an uniform mass distribution along the z-axis. Two-dimensional Z-pinch compression can be realized utilizing either a spherically shaped wire array or a double gas-puff single-shell liner with a special mass distribution along the z-axis. The results obtained from computer simulations show that both kinds of liners can be compressed in both the z and the r directions. This leads to a uniform and a high-power heating of the spherical dynamic hohlraum placed inside the liner. The spherical, two-dimensional liner implosion increases the power density at the hohlraum surface, improves the symmetry of the capsule irradiation and helps partially in quenching of the Rayleigh-Taylor instability
    Plasma Science, 1999. ICOPS '99. IEEE Conference Record - Abstracts. 1999 IEEE International Conference on; 02/1999
  • Source
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    ABSTRACT: There are various methods of rock drilling and demolition. Recently, a method utilizing pulsed power technology has appeared. This method is based on the difference of the dynamic breakdown field strength of liquid and solid dielectrics. The applicability of this method was examined. The features of the rock destruction have been studied. The mechanism explaining the breakdown of the dielectrics with high intrinsic inhomogeneity like natural rocks and concrete is proposed and proved experimentally. An inductive energy storage-opening switch system for the destruction of solid materials is designed allowing higher destruction efficiency. The experimental results using advanced diagnostics such as an image converter camera and X-ray computer tomography of samples are presented. High pulse energy experiments (up to 60 kT in pulse) have been conducted
    Pulsed Power Conference, 1999. Digest of Technical Papers. 12th IEEE International; 02/1999
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    ABSTRACT: The modified snowplow model of a plasma opening switch is proposed. The conduction phase is divided into two parts. The first part lasts until the current-carrying channel reaches the load end of the pre-filled plasma. The second part, the transition phase to the opening, is characterized by the motion of current carrying channel downstream the initial plasma location. The equation of motion of the current channel is solved for both phases and the snowplow mechanism for high-voltage pulse generation is developed. The theoretical dependencies are in good agreement with the experiment, which includes interferometry and optical fiber measurements of current front translation. The qualitative model of the switch plasma behavior is proposed and used in explanations of various plasma opening switch features
    Pulsed Power Conference, 1999. Digest of Technical Papers. 12th IEEE International; 02/1999
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    ABSTRACT: Cable plasma guns are frequently used as a plasma source in plasma opening switches. The authors' plasma guns are designed for use in a 400 kA inductive voltage adder with an inductive energy storage system. The plasma source consists of eight cable guns mounted on an outer coaxial electrode. The characteristics of the plasma generated by the cable plasma guns have been investigated using a laser interferometer. The contour maps of the plasma density of the whole area between the electrodes are plotted as a function of time
    Pulsed Power Conference, 1999. Digest of Technical Papers. 12th IEEE International; 02/1999
  • [Show abstract] [Hide abstract]
    ABSTRACT: An inductive voltage adder/inductive energy storage pulsed power generator, ASO-X, with a microsecond plasma opening switch (MPOS) is designed to drive a Z-pinch load. For good performance of a Z-pinch load, the load inductance between the MPOS and Z-pinch load should be low. To satisfy this requirement, the inner coaxial diameter of ASO-X and the length in the MPOS are 80 mm and 150 mm, respectively. The operation of the MPOS is strongly affected by the self magnetic field in the coaxial pulsed power generator. Usually, a good MPOS operation has been achieved at a magnetic field of several Tesla. The maximum amplitude of the magnetic field which is induced by the generator current of ASO-X at a charging voltage of 30 kV is less than 1 T. In spite of this low magnetic flux density, the MPOS operation in ASO-X is satisfactory. The magnetic field becomes less important if one uses a load with a very low inductance. The MPOS operation is analyzed from the viewpoint of an MPOS-Z-pinch scheme
    Pulsed Power Conference, 1999. Digest of Technical Papers. 12th IEEE International; 02/1999
  • Source
    I.V. Lisitsyn, H. Nomiyama, S. Katsuki, H. Akiyama
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    ABSTRACT: The reliable and durable reactor for wastewater treatment by pulsed streamer discharges is designed and tested. Uniform streamer discharges were obtained in water at pulsed electric loading. The volume of these discharges exceeds 200 cm<sup>3</sup> and the energy delivered to the discharge reached 40-400 J depending on the applied voltage. High amplitude of the voltage pulse applied to the reactor requires improved electric insulation to prevent the flashovers along the reactor surface both in water and air. High energy deposition due to high discharge current adds the requirements to the mechanical durability of the system. Small-size reactor with the volume of approximately 1 liter withstands successfully both high electrical and mechanical stresses. The reactor is designed for research purposes, however it can be upgraded to use in high repetition-rate regime necessary for applications
    Pulsed Power Conference, 1999. Digest of Technical Papers. 12th IEEE International; 02/1999
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    ABSTRACT: Gas-puff z-pinch plasmas are driven by an inductive voltage adder-inductive energy storage pulsed power generator “ASO-X” and the behavior of the plasma column and the spatial distribution of hot spots are investigated. ASO-X has a maximum output voltage and current of 180 kV and 400 kA respectively and can provide a fast current rise rate with the plasma opening switch (POS). By using ASO-X with POS operation, the stability of the plasma column and the spatial distribution of hot spots are improved
    Pulsed Power Conference, 1999. Digest of Technical Papers. 12th IEEE International; 02/1999
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    ABSTRACT: The streamer discharges are effectively used for biological and chemical cleaning of air and water. Uniform streamer discharges were obtained in water at pulsed electric loading. The volume of these discharges exceeds 400 cm3 and the energy delivered to the discharge reached 40-400 J depending on the applied voltage. The reliable and durable reactor for water treatment by pulsed streamer discharges is designed and tested. High voltage pulse amplitude applied to the reactor requires improved electric insulation to prevent flashover along the reactor surface both in water and air. High mechanical stress due to high discharge current adds the requirements to the mechanical durability of the system. A small-size reactor with the volume of approximately 1 l withstands successfully both high electrical and mechanical stresses. The reactor is designed for research purposes, however it can be upgraded to use in a high repetition-rate regime necessary for industrial applications.
    Review of Scientific Instruments 01/1999; 70:3457-3462. · 1.60 Impact Factor

Publication Stats

144 Citations
35.55 Total Impact Points

Institutions

  • 1997–2001
    • Kumamoto University
      • • Graduate School of Science and Technology
      • • Department of Computer Science and Elecrical Engineering
      Kumamoto-shi, Kumamoto Prefecture, Japan
    • Ariake National College of Technology
      Ōmuda, Fukuoka, Japan