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Bochkov V.,Pulsed Technologies Ltd. | Bochkov D.,Pulsed Technologies Ltd. | Nicolaev V.,Pulsed Technologies Ltd. | Teryoshin V.,Pulsed Technologies Ltd. | And 5 more authors.
Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2012 | Year: 2012

The issues of improvement of hold-off capability and reliability of high-voltage vacuum tubes, for example, X-ray tubes were studied. Two methods are suggested for improvement of the tubes operation. The first method is based on deposition of special coatings on the inner surface of tube isolator in the regions where electric field strength is high. These coatings have bulk electric conductivity higher than for isolator material but their surface conductivity is almost equal. The second method is based on pulsed surface melting of the tube electrodes with non-relativistic, high-current electron beam. Pulsed surface melting drastically reduces parasitic field emission, which results in the decrease of the charge density both in the bulk and surface of isolator providing high hold-off voltages through the tube. The tests of 160-kV and 250-kV X-ray tubes made utilizing the new above mentioned technologies have shown that parasitic currents do not exceed 1 μA and conditioning time decreases from 5 hours to 15 minutes. The new technology also allows to reduce dimensions of the tube. © 2012 IEEE.


Bochkov V.D.,Pulsed Technologies Ltd. | Bochkov D.V.,Pulsed Technologies Ltd. | Gnedin I.N.,Pulsed Technologies Ltd. | Vasiliev G.M.,National Academy of Sciences of Belarus | And 2 more authors.
Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2012 | Year: 2012

Pulsed Electric Field (PEF) processing is a non-thermal method of food preservation that uses high-voltage pulses for microbial inactivation and causes less effect on food quality than thermal methods. The crucial component of the modern PEF equipment is a high-voltage pulse generator (HVPG), consisting essentially of high voltage power supply and high voltage switch. Most of HVPG manufacturers deploy solid state switching components, which in most cases are disappointingly expensive. In this report the high-voltage pulse generator based on modified cold-cathode thyratron or pseudospark switch TPI1-10k/50 is described. The generator was built and tested with a pulsed electric field milk processing module, capable of producing up to 400 liters of milk per hour. Comprehensive research and biological tests of the milk quality were accomplished in cooperation with specialized certified laboratories in Belarus. The results confirmed the highest quality of the milk and compatibility of the product to the sanitary regulations. Initial cost of the milk processing module for 400 l/h was $100000. When the module will be commercially available the cost is expected to down 20-30%. © 2012 IEEE.


Chivel Y.,MerPhotonics | Chivel Y.,Pulsed Technologies Ltd. | Bochkov V.,Pulsed Technologies Ltd. | Gryshin Y.,Bauman University | And 2 more authors.
Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2012 | Year: 2012

A new atmospheric electromagnetic plasmadynamic system, pulsed-periodic plasmatron, operating at standard atmospheric pressure with high frequency has been developed. In this system plasma flow velocity reaches 3-5·10 3 m/s with temperature up to 15·103 K. The results are presented on the use of the pulsed-periodic plasmatron for surface layer modification and particles acceleration. © 2012 IEEE.


Akimov A.V.,RAS Budker Institute of Nuclear Physics | Akimov V.E.,RAS Budker Institute of Nuclear Physics | Bak P.A.,RAS Budker Institute of Nuclear Physics | Bochkov V.D.,Pulsed Technologies Ltd. | And 6 more authors.
Instruments and Experimental Techniques | Year: 2012

A pulse power system of the induction electron accelerator intended for parameters of 2 MeV, 2 kA, and operating in the double-pulse mode is presented. The schematic diagram and main elements of the pulse system are described, and the main technical solutions intended to produce a set of pulses with 21-kV peak voltages, peak currents of up to 8 kA, and 200-ns durations across a resistive-inductive load are indicated. The experimental data, which were obtained when separate units and the whole power system operated on the rated duty, are given. © Pleiades Publishing, Ltd., 2012.


Dubinov A.E.,RAS Federal Nuclear Center | Kornilova I.Y.,RAS Federal Nuclear Center | L'Vov I.L.,RAS Federal Nuclear Center | Sadovoy S.A.,RAS Federal Nuclear Center | And 5 more authors.
IEEE Transactions on Plasma Science | Year: 2010

Repetitively pulsed generators of high-power high-frequency pulses based on sealed-off discharge chambers with a hollow cathode are described in this paper. Pulses of length 100-800 ns and power up to 250 kW at a frequency of 120 MHz with a repetition rate of 100 Hz were obtained using the chamber equipped with a H2 source. Pulses of length 1001300 ns and power up to 900 kW at a frequency of 120 MHz with a repetition rate of 100 Hz were obtained using the chamber of similar design and equipped with a H2 source. The chamber filled with H2 proved to be more efficient compared to the chamber filled with H2. © 2006 IEEE.


Dubinov A.E.,RAS Federal Nuclear Center | Kornilova I.Y.,RAS Federal Nuclear Center | L'Vov I.L.,RAS Federal Nuclear Center | Sadovoy S.A.,RAS Federal Nuclear Center | And 5 more authors.
Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2012 | Year: 2012

Repetitively pulsed generators of high-power high frequency pulses based on sealed-off discharge chambers with a hollow cathode are described in this paper. Pulses of length 100-800 ns and power up to 250 kW at a frequency of 120 MHz with a repetition rate of 100 Hz were obtained using the chamber equipped with a H2 source. Pulses of length 100-1300 ns and power up to 900 kW at a frequency of 120 MHz with a repetition rate of 100 Hz were obtained using the chamber of similar design and equipped with a N2 source. The chamber filled with H2 proved to be more efficient compared to the chamber filled with N2. © 2012 IEEE.


Akimov A.V.,RAS Budker Institute of Nuclear Physics | Logachev P.V.,RAS Budker Institute of Nuclear Physics | Bochkov V.D.,Pulsed Technologies Ltd. | Bochkov D.V.,Pulsed Technologies Ltd. | And 2 more authors.
IEEE Transactions on Dielectrics and Electrical Insulation | Year: 2010

A double pulse modulator is described that is capable of generating two pulses of 200 ns duration at peak currents up to 10 kA with the delay between pulses as short as 2 μs. The TPI1-10k/50 tetrode and the TPI5-10k/50 pentode cold cathode thyratrons, which can be operated at voltages up to 50 kV, have been used as switching elements. A voltage hold-off recovery time of less than 1 μs has been demonstrated at an operating current of 7 kA and a reverse voltage hold-off of 24 kV. Unlike common gaseous switches, TPI thyratrons can operate for over 20,000 h at hundreds of kHz. These devices are serious competitors to both conventional hydrogen hot cathode thyratrons and to high-power solid-state switches. TPI thyratrons are particularly advantageous in burst mode operation where direct and reverse voltages in the range of tens of kV, currents up to 10 kA, nanosecond jitter and risetimes of 1-5 ns are required. © 2006 IEEE.


Bochkov V.D.,Pulsed Technologies Ltd. | Bochkov D.D.,Pulsed Technologies Ltd. | Gnedin I.N.,Pulsed Technologies Ltd. | Bak P.A.,RAS Budker Institute of Nuclear Physics | And 3 more authors.
Proceedings of the 2012 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2012 | Year: 2012

The pseudospark (thyratrons TPI- and TDI-type) switch drivers design and applications in various pulsed power systems are presented. Drivers are constructed using modern IGBT transistors and triggered compact spark gaps, and feature both manual and remote digital control (CAN, Ethernet). TDI-thyratrons can serve as a replacement for ignitron, spark gap and triggered vacuum switches. The TDI drivers are made with multiple outputs for triggering up to 4 thyratrons in parallel or with HV isolated output for applications where the igniter and hydrogen reservoir of the thyratron are under high (transient) voltages. TPI-thyratrons were designed recently however, we have extensive experience in application and the methods of triggering/controlling of these switches. The trigger unit is a simple relaxation oscillator with DC and Pulsed Preionization, including single, double and triple pulse triggering techniques. In particular it is shown that when the requirement for a driver is to provide minimum time jitter (less 0.5ns), high anode current pulse stability and extended lifetime, the best option is triple-pulse triggering. Circuit design for trigger drivers BZ-TP/10 for TPI-thyratrons, optimized for the operation of the particle accelerator LIU-2 are described. © 2012 IEEE.


Drozdovskiy A.A.,Institute of Theoretical and Experimental Physics | Golubev A.A.,Institute of Theoretical and Experimental Physics | Novozhilov Yu.B.,Institute of Theoretical and Experimental Physics | Sasorov P.V.,Institute of Theoretical and Experimental Physics | And 3 more authors.
Proceedings - Symposium on Fusion Engineering | Year: 2011

Transportation and focusing of intense heavy-ion beams is an important issue for heavy ion beam-driven inertial confinement fusion and physics of high energy densities. Application of plasma lens offers certain advantages over traditional systems based on quadruple lenses. A description of the plasma lens with high-power high-current (up to 400 kA) TDI-pseudosparks as switching elements and experimental results of preliminary studies of plasma lens designed for heavy ion accelerator-accumulated facility TWAC-ITEP are reported. It is shown that a focusing capability of plasma lens depends on a stage of plasma discharge development. In a particular stage it is possible to employ sharp focusing and compress the beam into a very small spot. In other stages when the magnet field is non-linear it is possible to shape various beam configurations, in particular, tube structures. In the report the results of investigations implemented with beams of C+6 and F+6 ions with energy of 200 MeV/a.e.m. are reported. The obtained results are analyzed. © 2011 IEEE.


Voitenko N.V.,Tomsk Polytechnic University | Yudin A.S.,Tomsk Polytechnic University | Kuznetsova N.S.,Tomsk Polytechnic University | Bochkov V.D.,Pulsed Technologies Ltd.
Journal of Physics: Conference Series | Year: 2015

The paper demonstrates the results of TDIl-200k/25SN-P pseudospark switch (PSS) developed by Russian company »Pulsed Technologies Ltd» application. PSS was used in pulsed power unit intended for electric-discharge fracture of rocks and concrete blocks and splitting off from monolith. The pulsed power unit has a pulse current generator with the capacity of 560 μF, stored energy of up to 63 kJ, operating voltage of up to15 kV, current pulse amplitude of up to 200 kA and pulse duration more than 200 μsec. The study also shows the current waveforms determined in the short-circuit experiment of the pulse current generator and in the experiments of the electric-discharge fragmentation of concrete at the charging voltage of 13 kV. PSS was operated in ringing single-pulse mode with the exceedance of more than two maximum permissible parameters: current pulse amplitude, current pulse duration and maximum pulse energy. Internal electrode erosion of PSS is shown and possible reasons of asymmetric current feed are discussed. © Published under licence by IOP Publishing Ltd.

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