Experiments are reported to demonstrate the ability of pseudospark switches for extremely fast recovery after forward conduction at an anode voltage of up to 25 kV and peak anode currents of one to two kiloamps. At a pulse duration of around 5 /spl mu/s, the reverse current is blocked at the end of the first pulse, at a rate of current rise of up to 1 kA//spl mu/s. The rate of rise of anode voltage after current zero is well above 30 kV//spl mu/s; the recovery time of the switch is below 1 /spl mu/s. Initial experiments towards reprate applications were successful in a burst mode operation, at a circuit-limited pulse repetition rate of up to 96 pps.
{"title":"High efficiency high voltage pulse generator with fast recovery pseudospark switches","authors":"W. Hartmann, M. Romheld, K. Rohde","doi":"10.1109/PPC.1999.825453","DOIUrl":"https://doi.org/10.1109/PPC.1999.825453","url":null,"abstract":"Experiments are reported to demonstrate the ability of pseudospark switches for extremely fast recovery after forward conduction at an anode voltage of up to 25 kV and peak anode currents of one to two kiloamps. At a pulse duration of around 5 /spl mu/s, the reverse current is blocked at the end of the first pulse, at a rate of current rise of up to 1 kA//spl mu/s. The rate of rise of anode voltage after current zero is well above 30 kV//spl mu/s; the recovery time of the switch is below 1 /spl mu/s. Initial experiments towards reprate applications were successful in a burst mode operation, at a circuit-limited pulse repetition rate of up to 96 pps.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"11 1","pages":"228-231 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78315323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Ballard, D. Baca, H. Davis, J. Elizondo, R. Gribble, K. Nielsen, G. Parker, R. Ricketts, G. Valdez
Atlas is a pulsed-power facility under development at Los Alamos National Laboratory to drive high-energy density experiments. Design has been completed for this new generation pulsed-power machine consisting of an azimuthal array of 24, 240-kV Marx modules and transmission lines supplying current to the load region at the machine center. The transmission line consists of a cable header, load protection switch, and tri-plate assembly interfacing to the center transition section. The cable header interface to the Marx module provides a mechanism to remove the Marx module for maintenance without removing other components of the transmission line. The load protection switch provides a mechanism for protecting the load during charging of the Marx in the event of a pre-fire condition. The aluminum tri-plate is a low-inductance transmission line that carries radial current flow from the Marx energy storage system at the machine periphery toward the load. All transmission line components are oil insulated except the solid-dielectric insulated power flow channel connected directly to the load. The transition region at the machine center consists of several components that enable the radial converging vertical transmission lines to interface to a horizontal disk/conical power flow channel delivering current to the load. The current carrying transition components include the high-voltage and ground conductors interfacing to the tri-plate transmission lines. The tri-plate tank attachment ring interfaces to the tri-plate tanks and the base-plate. The base-plate supports the transition components and interfaces to the center support structure of the machine. The bottom insulator also attaches to the base-plate and to the high-voltage conductor, providing an oil containment seal between the transition and vacuum vessel, Design has been completed for all Atlas components. Some prototype hardware fabrication has been completed and first article hardware is in various stages of completion. The first article is a single line of the machine and includes a Marx module, cable header, load protection switch, tri-plate transmission line, and a dump load for testing. Testing is in progress on some prototype and first article components to verify performance before production begins on critical system components. Production will soon begin for much of the overall system, including the Marx tanks, tri-plate tanks, support structure, some transition components, and the personnel platform. These components will be fabricated and installed while the remaining internal components are being fabricated.
{"title":"Atlas transmission line/transition design and fabrication status","authors":"E. Ballard, D. Baca, H. Davis, J. Elizondo, R. Gribble, K. Nielsen, G. Parker, R. Ricketts, G. Valdez","doi":"10.1109/PPC.1999.823668","DOIUrl":"https://doi.org/10.1109/PPC.1999.823668","url":null,"abstract":"Atlas is a pulsed-power facility under development at Los Alamos National Laboratory to drive high-energy density experiments. Design has been completed for this new generation pulsed-power machine consisting of an azimuthal array of 24, 240-kV Marx modules and transmission lines supplying current to the load region at the machine center. The transmission line consists of a cable header, load protection switch, and tri-plate assembly interfacing to the center transition section. The cable header interface to the Marx module provides a mechanism to remove the Marx module for maintenance without removing other components of the transmission line. The load protection switch provides a mechanism for protecting the load during charging of the Marx in the event of a pre-fire condition. The aluminum tri-plate is a low-inductance transmission line that carries radial current flow from the Marx energy storage system at the machine periphery toward the load. All transmission line components are oil insulated except the solid-dielectric insulated power flow channel connected directly to the load. The transition region at the machine center consists of several components that enable the radial converging vertical transmission lines to interface to a horizontal disk/conical power flow channel delivering current to the load. The current carrying transition components include the high-voltage and ground conductors interfacing to the tri-plate transmission lines. The tri-plate tank attachment ring interfaces to the tri-plate tanks and the base-plate. The base-plate supports the transition components and interfaces to the center support structure of the machine. The bottom insulator also attaches to the base-plate and to the high-voltage conductor, providing an oil containment seal between the transition and vacuum vessel, Design has been completed for all Atlas components. Some prototype hardware fabrication has been completed and first article hardware is in various stages of completion. The first article is a single line of the machine and includes a Marx module, cable header, load protection switch, tri-plate transmission line, and a dump load for testing. Testing is in progress on some prototype and first article components to verify performance before production begins on critical system components. Production will soon begin for much of the overall system, including the Marx tanks, tri-plate tanks, support structure, some transition components, and the personnel platform. These components will be fabricated and installed while the remaining internal components are being fabricated.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"50 1","pages":"929-932 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75944639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Analysis has been made of experimental data on generating superstrong pulse magnetic fields in copper solenoids by the method of direct discharge of capacitor bank. The upper limit of the amplitude of achievable magnetic field induction has been found and explained using energy estimates.
{"title":"Physical constraint to superstrong magnetic fields by a method of direct discharge","authors":"S. Krivosheev","doi":"10.1109/PPC.1999.823622","DOIUrl":"https://doi.org/10.1109/PPC.1999.823622","url":null,"abstract":"Analysis has been made of experimental data on generating superstrong pulse magnetic fields in copper solenoids by the method of direct discharge of capacitor bank. The upper limit of the amplitude of achievable magnetic field induction has been found and explained using energy estimates.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"57 1","pages":"750-753 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76200101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Ko, Jung-Mo Choi, Jae-Ryong Jeon, K. Chung, Gon-Ho Kim, E. Hotta
Plasmas have been used to reduce flue gases. Research has shown that positive and negative coronas using pulsed voltages have an effect on removing SO/sub 2/, NO, and NO/sub 2/. In this paper bidirectional pulsed voltages are used to increase the efficiency of flue-gas reactors. The particle-mesh model using NGP (nearest-grid-point) and FEM (finite element method) calculate the detailed space-time variations of the electric fields for the streamer and it makes the characteristics of reactor clearer. In this simulation NO is considered a dominant gas.
等离子体已被用于减少烟气。研究表明，使用脉冲电压的正负电晕对去除SO/sub 2/、NO和NO/sub 2/有影响。本文采用双向脉冲电压来提高烟气反应器的效率。采用NGP (nearest-grid-point)和FEM (finite element method)相结合的粒子网格模型详细计算了流线电场的时空变化，使反应器的特性更加清晰。在这个模拟中，NO被认为是主要气体。
{"title":"High efficient discharge processes of large-capacity flue gas by using bidirectional pulse generator","authors":"K. Ko, Jung-Mo Choi, Jae-Ryong Jeon, K. Chung, Gon-Ho Kim, E. Hotta","doi":"10.1109/PPC.1999.823763","DOIUrl":"https://doi.org/10.1109/PPC.1999.823763","url":null,"abstract":"Plasmas have been used to reduce flue gases. Research has shown that positive and negative coronas using pulsed voltages have an effect on removing SO/sub 2/, NO, and NO/sub 2/. In this paper bidirectional pulsed voltages are used to increase the efficiency of flue-gas reactors. The particle-mesh model using NGP (nearest-grid-point) and FEM (finite element method) calculate the detailed space-time variations of the electric fields for the streamer and it makes the characteristics of reactor clearer. In this simulation NO is considered a dominant gas.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"17 1","pages":"1299-1302 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75841508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Souda, F. Endo, C. Yamazaki, K. Okamura, K. Fukushima
High power capacitor charging power supply (CCPS) using a series resonant converter technology has been developed. The CCPS adopted a 33 kHz IGBT series resonant inverter and a high-efficiency, high-voltage transformer. The performance test of the CCPS was carried out with a 33 nF load capacitor at 40 kV output voltage and 1 kpps repetition rate. Peak power rate of 38 kJ/s and efficiency of 80.4% were obtained.
{"title":"Development of high power capacitor charging power supply for pulsed power applications","authors":"M. Souda, F. Endo, C. Yamazaki, K. Okamura, K. Fukushima","doi":"10.1109/PPC.1999.823794","DOIUrl":"https://doi.org/10.1109/PPC.1999.823794","url":null,"abstract":"High power capacitor charging power supply (CCPS) using a series resonant converter technology has been developed. The CCPS adopted a 33 kHz IGBT series resonant inverter and a high-efficiency, high-voltage transformer. The performance test of the CCPS was carried out with a 33 nF load capacitor at 40 kV output voltage and 1 kpps repetition rate. Peak power rate of 38 kJ/s and efficiency of 80.4% were obtained.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"71 1","pages":"1414-1416 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74745504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The capacitor requirement of the National Ignition Facility (NIF) calls for 85 kJ energy discharge capacitors to be operated at 24 kV DC and 30000 Amps peak current per discharge, with 20000 charge-discharge cycles as the design life. Metallized-Kraft (MK) OPP capacitors (Aerovox type KM) submitted for qualification have exceeded these requirements, but with energy density limited to 0.77 J/cc. Significant cost reductions can be had with the development of an increased energy density capacitor, however, increased energy density is obtained at the cost of life. Results to date for engineering development of a higher energy density capacitor is summarized in this paper. Several electrode-dielectric configurations were evaluated by fabrication and testing of miniature scale, single section, capacitors. From these trials, we selected an alternative approach employing a rough metallized polypropylene (MPP) dielectric system. This rough MPP dielectric-electrode system yields a >10% gain in energy density, which results in a substantial cost reduction over the qualification KM type. Validation of NIF capacitor requirements by comprehensive testing of 1/6-scale full voltage (24 kV DC) capacitors came close to meeting the required shot life. Engineering development is proceeding on a MK high energy density capacitor that can yield the same cost reduction.
{"title":"Development of a high energy density storage capacitor for NIF","authors":"T. Scholz, P. Winsor, M. Hudis","doi":"10.1109/PPC.1999.825425","DOIUrl":"https://doi.org/10.1109/PPC.1999.825425","url":null,"abstract":"The capacitor requirement of the National Ignition Facility (NIF) calls for 85 kJ energy discharge capacitors to be operated at 24 kV DC and 30000 Amps peak current per discharge, with 20000 charge-discharge cycles as the design life. Metallized-Kraft (MK) OPP capacitors (Aerovox type KM) submitted for qualification have exceeded these requirements, but with energy density limited to 0.77 J/cc. Significant cost reductions can be had with the development of an increased energy density capacitor, however, increased energy density is obtained at the cost of life. Results to date for engineering development of a higher energy density capacitor is summarized in this paper. Several electrode-dielectric configurations were evaluated by fabrication and testing of miniature scale, single section, capacitors. From these trials, we selected an alternative approach employing a rough metallized polypropylene (MPP) dielectric system. This rough MPP dielectric-electrode system yields a >10% gain in energy density, which results in a substantial cost reduction over the qualification KM type. Validation of NIF capacitor requirements by comprehensive testing of 1/6-scale full voltage (24 kV DC) capacitors came close to meeting the required shot life. Engineering development is proceeding on a MK high energy density capacitor that can yield the same cost reduction.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"64 1","pages":"114-117 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74832367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Z-pinches now constitute the most energetic and powerful sources of X-rays available by a large margin. The Z accelerator at Sandia National Laboratories has produced 1.8 MJ of X-ray energy, 280 TW of power, and hohlraum temperatures of 200 eV. These advances are being applied to inertial confinement fusion (ICF) experiments on Z. The requirements for high fusion yield are exemplified in the target to be driven by the X-1 accelerator. X-1 will drive two Z-pinches, each producing 7 MJ of X-ray energy and about 1000 TW of X-ray power. Together, these radiation sources will heat a hohlraum containing the 4-mm diameter ICF capsule to a temperature exceeding 225 eV for about 10 ns, with the pulse shape required to drive the capsule to high fusion yield; in the range of 200-1000 MJ. Since X-1 consists of two identical accelerators, it is possible to mitigate the technical risk of high yield by constructing one accelerator. This accelerator, ZX, will bridge the gap from Z to X-1 by driving an integrated target experiment with a very efficient energy source. ZX will also provide experimental confirmation that the full specifications of the X-1 accelerator for high yield are achievable, and that a realistic path to high fusion yield exists.
{"title":"Z, ZX, and X-1: a realistic path to high fusion yield","authors":"D. Cook","doi":"10.1109/PPC.1999.825419","DOIUrl":"https://doi.org/10.1109/PPC.1999.825419","url":null,"abstract":"Z-pinches now constitute the most energetic and powerful sources of X-rays available by a large margin. The Z accelerator at Sandia National Laboratories has produced 1.8 MJ of X-ray energy, 280 TW of power, and hohlraum temperatures of 200 eV. These advances are being applied to inertial confinement fusion (ICF) experiments on Z. The requirements for high fusion yield are exemplified in the target to be driven by the X-1 accelerator. X-1 will drive two Z-pinches, each producing 7 MJ of X-ray energy and about 1000 TW of X-ray power. Together, these radiation sources will heat a hohlraum containing the 4-mm diameter ICF capsule to a temperature exceeding 225 eV for about 10 ns, with the pulse shape required to drive the capsule to high fusion yield; in the range of 200-1000 MJ. Since X-1 consists of two identical accelerators, it is possible to mitigate the technical risk of high yield by constructing one accelerator. This accelerator, ZX, will bridge the gap from Z to X-1 by driving an integrated target experiment with a very efficient energy source. ZX will also provide experimental confirmation that the full specifications of the X-1 accelerator for high yield are achievable, and that a realistic path to high fusion yield exists.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"4 1","pages":"33-37 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73037948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Boev, V. Vajov, D. Jgun, B. Levchenko, V. Muratov, A. Adam, K. Uemura
The possibilities of electropulse destruction of nonconductive materials and boring at various laboratory and field conditions have been studied at Tomsk Polytechnic University for many years. The test laboratory experiments in this work are realized under the following conditions: two electrodes are placed on the plate surface of a coupon. The coupon is immersed into a tank with insulation liquid. Pulse voltage is applied between electrodes. When pulse duration is less than 1 /spl mu/s and insulation liquid is used, the discharge channel occurs in solid material and causes its destruction. The usage of water as an insulation liquid did not show good results, because water has less breakdown voltage and provides considerable current leakage. This work is devoted to determining the possibilities of water use to demolish granite and concrete at large distance between the electrodes. It was found that the breakdown voltage during the pulse drop is 1.5-2.0 times less than that for the case when the discharge happens during the pulse rise. Consequently, we have less voltage amplitude and current leakage in water. The possibilities and the efficiency of the electropulse destruction of rock and concrete in water are discussed. The mechanism of discharge channel penetration in a solid is also discussed.
{"title":"Destruction of granite and concrete in water with pulse electric discharges","authors":"S. Boev, V. Vajov, D. Jgun, B. Levchenko, V. Muratov, A. Adam, K. Uemura","doi":"10.1109/PPC.1999.823782","DOIUrl":"https://doi.org/10.1109/PPC.1999.823782","url":null,"abstract":"The possibilities of electropulse destruction of nonconductive materials and boring at various laboratory and field conditions have been studied at Tomsk Polytechnic University for many years. The test laboratory experiments in this work are realized under the following conditions: two electrodes are placed on the plate surface of a coupon. The coupon is immersed into a tank with insulation liquid. Pulse voltage is applied between electrodes. When pulse duration is less than 1 /spl mu/s and insulation liquid is used, the discharge channel occurs in solid material and causes its destruction. The usage of water as an insulation liquid did not show good results, because water has less breakdown voltage and provides considerable current leakage. This work is devoted to determining the possibilities of water use to demolish granite and concrete at large distance between the electrodes. It was found that the breakdown voltage during the pulse drop is 1.5-2.0 times less than that for the case when the discharge happens during the pulse rise. Consequently, we have less voltage amplitude and current leakage in water. The possibilities and the efficiency of the electropulse destruction of rock and concrete in water are discussed. The mechanism of discharge channel penetration in a solid is also discussed.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"26 1","pages":"1369-1371 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81955113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An integral part of the Explosive-Driven Power Generation Program is to enhance the quality and resolution of photography of the surface of EDPG armatures during explosive expansion. The quality and resolution of photography are affected by the amount of illumination, its wavelength, pulse duration, shock effects from the explosive event, explosive plasmas, and surrounding atmospheric characteristics (shock generation of light, blurring, refraction, etc.). Current methods of providing illumination for very high speed photography (/spl sim/1/spl times/10/sup 6/ frames per second) involve the utilization of intense light generated by explosive events such as so-called "argon bombs"; however, such devices reduce the maximum explosive weight in the experimental device and also generate light of a less desirable wavelength. A new system was developed in-house using inexpensive equipment that allows flash photography at 1/spl times/10/sup 6/ frames per second utilizing 100 ISO film. This equipment is described along with the techniques used to mitigate the deleterious effects of the explosive event on its surrounding environment. The resultant imaging maximizes resolution of phenomena at the armature surface, far surpassing any previously achieved at this facility.
{"title":"Maximizing resolution of the high-speed photography of explosive-driven power generator (EDPG) armatures in operation","authors":"P. Worsey, J. Baird, M. Schmidt","doi":"10.1109/PPC.1999.823715","DOIUrl":"https://doi.org/10.1109/PPC.1999.823715","url":null,"abstract":"An integral part of the Explosive-Driven Power Generation Program is to enhance the quality and resolution of photography of the surface of EDPG armatures during explosive expansion. The quality and resolution of photography are affected by the amount of illumination, its wavelength, pulse duration, shock effects from the explosive event, explosive plasmas, and surrounding atmospheric characteristics (shock generation of light, blurring, refraction, etc.). Current methods of providing illumination for very high speed photography (/spl sim/1/spl times/10/sup 6/ frames per second) involve the utilization of intense light generated by explosive events such as so-called \"argon bombs\"; however, such devices reduce the maximum explosive weight in the experimental device and also generate light of a less desirable wavelength. A new system was developed in-house using inexpensive equipment that allows flash photography at 1/spl times/10/sup 6/ frames per second utilizing 100 ISO film. This equipment is described along with the techniques used to mitigate the deleterious effects of the explosive event on its surrounding environment. The resultant imaging maximizes resolution of phenomena at the armature surface, far surpassing any previously achieved at this facility.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"44 1","pages":"1110-1113 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79411616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Ibuka, T. Osada, K. Jingushi, M. Suda, T. Nakamura, K. Yasuoka, S. Ishii
Fast SI-thyristor switching systems were designed and examined for environmental applications. The authors characterized three kinds of SI-thyristor with different device structures by using an extremely low inductance testing circuit, and confirmed the superiority of punch-through and flat-anode structures for fast turn-on characteristics. In order to accomplish fast turn-on operation, they developed a fast and high current gate-driving circuit for repetitive pulsed power applications. The SI-thyristors were successfully operated with a fall time of 35 ns and a current rising rate of 9.5/spl rlarr2/10/sup 10/ A/s. To clarify technical issues for higher voltage operation, they employed three SI-thyristors stacked in series to assemble the generator, which was operated with a repetition rate of 2 kHz.
设计并测试了用于环境应用的快速硅晶闸管开关系统。利用极低电感测试电路对三种不同器件结构的硅晶闸管进行了表征，证实了冲穿结构和平阳极结构在快速导通特性方面的优越性。为了实现快速导通操作，他们开发了一种用于重复脉冲功率应用的快速大电流栅极驱动电路。硅晶闸管的下降时间为35 ns，电流上升速率为9.5/spl / rlar2 /10/sup 10/ a /s。为了澄清更高电压操作的技术问题，他们采用了三个硅晶闸管串联堆叠来组装发电机，其重复频率为2 kHz。
{"title":"Pulsed power generator utilizing fast SI-thyristors for environmental applications","authors":"S. Ibuka, T. Osada, K. Jingushi, M. Suda, T. Nakamura, K. Yasuoka, S. Ishii","doi":"10.1109/PPC.1999.823801","DOIUrl":"https://doi.org/10.1109/PPC.1999.823801","url":null,"abstract":"Fast SI-thyristor switching systems were designed and examined for environmental applications. The authors characterized three kinds of SI-thyristor with different device structures by using an extremely low inductance testing circuit, and confirmed the superiority of punch-through and flat-anode structures for fast turn-on characteristics. In order to accomplish fast turn-on operation, they developed a fast and high current gate-driving circuit for repetitive pulsed power applications. The SI-thyristors were successfully operated with a fall time of 35 ns and a current rising rate of 9.5/spl rlarr2/10/sup 10/ A/s. To clarify technical issues for higher voltage operation, they employed three SI-thyristors stacked in series to assemble the generator, which was operated with a repetition rate of 2 kHz.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"35 1","pages":"1441-1444 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84657828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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