Pub Date : 2007-06-17DOI: 10.1109/PPPS.2007.4345710
L. Aranchuk, J. Larour
A series of seven XRD and four p-i-n detectors with K- and L-filters was employed to measure absolute time resolved spectra of 200-ns 200-kA molybdenum and copper X-pinch plasmas.
{"title":"Absolute spectral radiation from 200-ns X-pinch plasma","authors":"L. Aranchuk, J. Larour","doi":"10.1109/PPPS.2007.4345710","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345710","url":null,"abstract":"A series of seven XRD and four p-i-n detectors with K- and L-filters was employed to measure absolute time resolved spectra of 200-ns 200-kA molybdenum and copper X-pinch plasmas.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133594918","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}
Pub Date : 2007-06-17DOI: 10.1109/PPPS.2007.4345656
P. Wakeland, J. Corley, K. Hodge, D. Guthrie, V. Anaya, Z. Wallace, T. Thompson, G. Feltz, R. Maier, K. LeChien, M. Savage, D. Susan, R. Grant, J. Van Den Avyle
The Z machine at Sandia National Laboratories is a thirty six module pulsed power driver utilized for the study of inertial confinement fusion, isentropic compression experiments, and high density physics. Currently it is undergoing an upgrade, called Z-Refurbishment (ZR). The upgraded Z pulsed power driver requires thirty six gas switches to be capable of low jitter high voltage switching, to deliver energy to the load. The switches must remain open as voltage rises in ∼one microsecond, then close with a few nanosecond jitter upon arrival of the laser pulse. Switch performance is directly related to component materials since switches must routinely withstand a 6.25 MV, 750 kA pulsed power environment and perform reliably upon each command fire. Switch lifetime is primarily influenced by insulator flashover and electrode degradation. Early in the program the most high profile problem was random flashing of the insulator housing. Triple point shielding, cleaning procedures and an isolation window that separated the gas switch volume from the laser can volume were implemented which reduced housing flashes, to problems attributed to material debris. Electrode materials were studied in an attempt to optimize switch lifetime with respect to erosion rate, housing flashes associated with material debris and to reduce degradation of laser optics that are in close proximity to the switch. Theories on electrode ablation have contributed it to enhancing fields in the trigger section and flashing of the cascade housing. Electrode materials investigated included, tungsten-copper, stainless steel, molybdenum, tantalum and brass. SEM imaging was utilized to examine effects of arc damage for different materials. SEM imaging is also being used in attempts to understand preconditioning of electrodes and early shot switch performance.
{"title":"Material testing on high voltage laser triggered gas switches for ZR","authors":"P. Wakeland, J. Corley, K. Hodge, D. Guthrie, V. Anaya, Z. Wallace, T. Thompson, G. Feltz, R. Maier, K. LeChien, M. Savage, D. Susan, R. Grant, J. Van Den Avyle","doi":"10.1109/PPPS.2007.4345656","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345656","url":null,"abstract":"The Z machine at Sandia National Laboratories is a thirty six module pulsed power driver utilized for the study of inertial confinement fusion, isentropic compression experiments, and high density physics. Currently it is undergoing an upgrade, called Z-Refurbishment (ZR). The upgraded Z pulsed power driver requires thirty six gas switches to be capable of low jitter high voltage switching, to deliver energy to the load. The switches must remain open as voltage rises in ∼one microsecond, then close with a few nanosecond jitter upon arrival of the laser pulse. Switch performance is directly related to component materials since switches must routinely withstand a 6.25 MV, 750 kA pulsed power environment and perform reliably upon each command fire. Switch lifetime is primarily influenced by insulator flashover and electrode degradation. Early in the program the most high profile problem was random flashing of the insulator housing. Triple point shielding, cleaning procedures and an isolation window that separated the gas switch volume from the laser can volume were implemented which reduced housing flashes, to problems attributed to material debris. Electrode materials were studied in an attempt to optimize switch lifetime with respect to erosion rate, housing flashes associated with material debris and to reduce degradation of laser optics that are in close proximity to the switch. Theories on electrode ablation have contributed it to enhancing fields in the trigger section and flashing of the cascade housing. Electrode materials investigated included, tungsten-copper, stainless steel, molybdenum, tantalum and brass. SEM imaging was utilized to examine effects of arc damage for different materials. SEM imaging is also being used in attempts to understand preconditioning of electrodes and early shot switch performance.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133894951","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}
Pub Date : 2007-06-17DOI: 10.1109/PPPS.2007.4346004
A. Woods, L. Ludeking
Electromagnetic (EM) boundary treatments have been investigated using the Magic 3D particle-in-cell (PIC) code. The historic conventional free space approach to absorbing boundary layers and the convolutional perfectly matched layer (CPML) are investigated. A comparison of the utility of such approaches in various practical applications is provided with some of the liabilities associated. The CPML method gives vast improvement for evanescent wave problems, but benefits are modest for a 3D waveguide in the radiation zone based on present modeling capabilities.
{"title":"Some practical issues in the treatment of electromagnetic boundaries in FDTD-PIC","authors":"A. Woods, L. Ludeking","doi":"10.1109/PPPS.2007.4346004","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4346004","url":null,"abstract":"Electromagnetic (EM) boundary treatments have been investigated using the Magic 3D particle-in-cell (PIC) code. The historic conventional free space approach to absorbing boundary layers and the convolutional perfectly matched layer (CPML) are investigated. A comparison of the utility of such approaches in various practical applications is provided with some of the liabilities associated. The CPML method gives vast improvement for evanescent wave problems, but benefits are modest for a 3D waveguide in the radiation zone based on present modeling capabilities.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134452138","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}
Pub Date : 2007-06-17DOI: 10.1109/PPPS.2007.4652351
D. Welch, D. Rose, N. Bruner, S. Portillo, B. Oliver
The self-magnetic pinch diode is being developed as an intense electron beam source for high-power x-ray radiography. The diode is comprised of a ∼1-cm diameter, hollow cathode with a rounded tip from which a high-current electron beam is emitted. The beam self focuses in its own magnetic field as it propagates across a ∼1-cm vacuum gap where it deposits its energy onto a planar high-atomic-number bremsstrahlung target. Heating of the anode by the beam quickly provides an ion emitting plasma and bipolar diode operation. The dynamics of expanding electrode plasmas can affect the impedance lifetime of the diode. Realistic modeling of such plasmas is being pursued to aid in the understanding of the operating characteristics of these diodes as well as establishing scaling relations for reliable extrapolation to higher voltages. Here, a hybrid particle-in-cell code is used to study the evolution of electrode plasmas in the self-magnetic pinch diode for a nominal 6-MV voltage and different anode-cathode gaps. The impact of the intense ion beam on the cathode surface can lead to enhancement of the cathode plasma production and faster diode impedance loss.
{"title":"Role of plasmas in the operation of a self-magnetically pinched diode","authors":"D. Welch, D. Rose, N. Bruner, S. Portillo, B. Oliver","doi":"10.1109/PPPS.2007.4652351","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4652351","url":null,"abstract":"The self-magnetic pinch diode is being developed as an intense electron beam source for high-power x-ray radiography. The diode is comprised of a ∼1-cm diameter, hollow cathode with a rounded tip from which a high-current electron beam is emitted. The beam self focuses in its own magnetic field as it propagates across a ∼1-cm vacuum gap where it deposits its energy onto a planar high-atomic-number bremsstrahlung target. Heating of the anode by the beam quickly provides an ion emitting plasma and bipolar diode operation. The dynamics of expanding electrode plasmas can affect the impedance lifetime of the diode. Realistic modeling of such plasmas is being pursued to aid in the understanding of the operating characteristics of these diodes as well as establishing scaling relations for reliable extrapolation to higher voltages. Here, a hybrid particle-in-cell code is used to study the evolution of electrode plasmas in the self-magnetic pinch diode for a nominal 6-MV voltage and different anode-cathode gaps. The impact of the intense ion beam on the cathode surface can lead to enhancement of the cathode plasma production and faster diode impedance loss.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133156104","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}
Pub Date : 2007-06-17DOI: 10.1109/PPPS.2007.4345746
B. Weber, R. Allen, R. Commisso, G. Cooperstein, D. Hinshelwood, D. Mosher, D. Murphy, P. Ottinger, D. Phipps, J. Schumer, S. Stephanakis, S. Swanekamp, S. Pope, J. Threadgold, L. Biddle, S. Clough, A. Jones, M. Sinclair, D. Swatton, T. Carden, B. Oliver
The plasma-filled rod-pinch diode (PFRP) produces an intense, small x-ray source suitable for pulsed hydrodynamic radiography applications. This paper summarizes measurements of the radiographic properties of the PFRP. The small x-ray source diameter [0.4-mm full-width-at-half-maximum line-spread function] and high dose [23 rad(CaF2) at 1 m] with 1–2 MeV electron energies are unique capabilities that the PFRP offers for radiographic imaging in this electron-energy range. The source distribution has a narrow central peak that can enhance the spatial resolution relative to other sources with the same spot size (by standard definitions). The spectrum has enhanced emission of sub-300 keV x-rays that can improve the contrast of objects with low areal mass.
{"title":"Plasma-filled rod-pinch diode research on gamble II","authors":"B. Weber, R. Allen, R. Commisso, G. Cooperstein, D. Hinshelwood, D. Mosher, D. Murphy, P. Ottinger, D. Phipps, J. Schumer, S. Stephanakis, S. Swanekamp, S. Pope, J. Threadgold, L. Biddle, S. Clough, A. Jones, M. Sinclair, D. Swatton, T. Carden, B. Oliver","doi":"10.1109/PPPS.2007.4345746","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345746","url":null,"abstract":"The plasma-filled rod-pinch diode (PFRP) produces an intense, small x-ray source suitable for pulsed hydrodynamic radiography applications. This paper summarizes measurements of the radiographic properties of the PFRP. The small x-ray source diameter [0.4-mm full-width-at-half-maximum line-spread function] and high dose [23 rad(CaF2) at 1 m] with 1–2 MeV electron energies are unique capabilities that the PFRP offers for radiographic imaging in this electron-energy range. The source distribution has a narrow central peak that can enhance the spatial resolution relative to other sources with the same spot size (by standard definitions). The spectrum has enhanced emission of sub-300 keV x-rays that can improve the contrast of objects with low areal mass.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114229355","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}
Pub Date : 2007-06-17DOI: 10.1109/PPPS.2007.4345511
F. White, S. Glover, K. Reed, M. Harden
Advancements in fusion research and Equation of State (EOS) experiments have led to a need for greater control over the shape of the current waveform in the load. This added complexity will necessitate more sophisticated pulsed power designs. Challenges introduced by these new systems include the requirement for more elaborate control systems to accommodate multiple independent switching times and an improved understanding of how dwell times and jitter affect performance. A subscale programmable current adder has been built to investigate the issues. This system has six independently programmable bricks and is capable of achieving peak currents greater than 2 kA. The bricks were characterized and modeled as a prerequisite to the application of genetic algorithms (GA’s) to determine the required initial conditions, switch triggering times and the brick charge voltages necessary to achieve commanded current shapes. This paper presents a description of the system control, circuit topology, solid-state triggering, charging systems, and system characterization. All of these system parameters are discussed within the context of commanded and measured output currents.
{"title":"Current adder with programmable pulse shaping","authors":"F. White, S. Glover, K. Reed, M. Harden","doi":"10.1109/PPPS.2007.4345511","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345511","url":null,"abstract":"Advancements in fusion research and Equation of State (EOS) experiments have led to a need for greater control over the shape of the current waveform in the load. This added complexity will necessitate more sophisticated pulsed power designs. Challenges introduced by these new systems include the requirement for more elaborate control systems to accommodate multiple independent switching times and an improved understanding of how dwell times and jitter affect performance. A subscale programmable current adder has been built to investigate the issues. This system has six independently programmable bricks and is capable of achieving peak currents greater than 2 kA. The bricks were characterized and modeled as a prerequisite to the application of genetic algorithms (GA’s) to determine the required initial conditions, switch triggering times and the brick charge voltages necessary to achieve commanded current shapes. This paper presents a description of the system control, circuit topology, solid-state triggering, charging systems, and system characterization. All of these system parameters are discussed within the context of commanded and measured output currents.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123377029","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}
Pub Date : 2007-06-17DOI: 10.1109/PPPS.2007.4345947
T. Tang, D. Singleton, C. Cathey, A. Kuthi, M. Gundersen
This pulse generator was developed to provide a compact, cost effective method for transient plasma ignition (TPI) experiments, which typically require the formation of arrays of streamers. A pulse adding method is described wherein a fast pulse (20 ns) is combined with a slow pulse (10’s μs). Streamer formation is observed under conditions where breakdown normally does not occur. The fast pulse generator is based on a magnetic reactor driven diode opening switch that produces a 20 ns, 60 kV pulse. This fast pulse is then added to a slow rising pulse produced via a flyback rapid charger (30 kV, 30 μs pulse). At the same peak output voltage level, the dual pulse system in a smaller gap (0.6″) was able to achieve similar results as a pseudospark switched pulse generator (∼60 kV, 50 ns) in a CH4-air, Φ=1, 1 atm, larger gap (1.3″), and the dual pulse system is able to deliver higher peak voltage than the pseudospark generator. The ignition performance at higher peak voltage is under investigation. Additionally a next generation high repetition rate pulse generator design is outlined that is based solely on magnetic compression.
{"title":"Solid state pulse adding system for transient plasma ignition","authors":"T. Tang, D. Singleton, C. Cathey, A. Kuthi, M. Gundersen","doi":"10.1109/PPPS.2007.4345947","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345947","url":null,"abstract":"This pulse generator was developed to provide a compact, cost effective method for transient plasma ignition (TPI) experiments, which typically require the formation of arrays of streamers. A pulse adding method is described wherein a fast pulse (20 ns) is combined with a slow pulse (10’s μs). Streamer formation is observed under conditions where breakdown normally does not occur. The fast pulse generator is based on a magnetic reactor driven diode opening switch that produces a 20 ns, 60 kV pulse. This fast pulse is then added to a slow rising pulse produced via a flyback rapid charger (30 kV, 30 μs pulse). At the same peak output voltage level, the dual pulse system in a smaller gap (0.6″) was able to achieve similar results as a pseudospark switched pulse generator (∼60 kV, 50 ns) in a CH4-air, Φ=1, 1 atm, larger gap (1.3″), and the dual pulse system is able to deliver higher peak voltage than the pseudospark generator. The ignition performance at higher peak voltage is under investigation. Additionally a next generation high repetition rate pulse generator design is outlined that is based solely on magnetic compression.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123483834","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}
Pub Date : 2007-06-17DOI: 10.1109/PPPS.2007.4345521
S. Khadijah, T. Akitsu, T. Otagawa, S. Yamazaki, T. Sakurai
Micro barrier discharge operating at atmospheric air was excited by a compact pulse generator which has the capability to produce fast rising voltage pulse with maximum rise up voltage as high as 435MV/s. Sequences of images and its intensity values were recorded at 100 nanoseconds intervals as a function of gap distance and applied voltage. Results showed that the discharge intensities are afterglow microplasma. Maximum intensity values were obtained at approximate time for each condition. Uniformity of discharge obtained when gap distance was 600 μm and applied voltage was 6 kV.
{"title":"Investigating intensities of very high voltage rise dv/dt pulsed power source in atmospheric microplasma","authors":"S. Khadijah, T. Akitsu, T. Otagawa, S. Yamazaki, T. Sakurai","doi":"10.1109/PPPS.2007.4345521","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345521","url":null,"abstract":"Micro barrier discharge operating at atmospheric air was excited by a compact pulse generator which has the capability to produce fast rising voltage pulse with maximum rise up voltage as high as 435MV/s. Sequences of images and its intensity values were recorded at 100 nanoseconds intervals as a function of gap distance and applied voltage. Results showed that the discharge intensities are afterglow microplasma. Maximum intensity values were obtained at approximate time for each condition. Uniformity of discharge obtained when gap distance was 600 μm and applied voltage was 6 kV.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123534805","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}
Pub Date : 2007-06-17DOI: 10.1109/PPPS.2007.4651948
S. Narahara, T. Namihira, K. Nakashima, S. Inoue, S. Iizasa, S. Maeda, M. Shigeishi, M. Ohtsu, H. Akiyama
In Japan, the most of waste concrete scraps have been reused as roadbed materials and the recycling ratio of waste concrete scraps has been kept over 95 % from 2000. However, it is expected that the demands of waste concrete scraps as roadbed materials would decrease even though the waste concrete scraps increase with the pulling down buildings in next decade. These facts mean that the recycling of waste concrete scraps would be in the negative situation. Therefore, the development of new recycling technology of waste concrete scraps is paramount importance in Japan. In this work, the pulsed power discharges inside of waste concrete scraps immersed in water were used to reproduce the coarse aggregate. In the experiments, the Marx generator, which storages the energy of 6.4 kJ/Pulse, was used as pulsed power source and the point to hemisphere mesh electrode was immersed in water. The pulsed voltages with 400 kV of peak voltage were applied to the concrete scraps placed on hemisphere mesh and the reproduced coarse aggregates were evaluated after the repetitive discharge treatment. From the experimental results, it is found that the coarse aggregates reproduced by 40∼60 pulsed discharge treatments have the enough qualities of the bone-dry density and the water absorption rate to satisfy JIS (Japan Industrial Standard) regulation (A 5005). In addition, the concretes consisted of the reproduced coarse aggregate also have the enough compressed strength and Young’s module to utilize as the construction material.
{"title":"Evaluation of concrete made from recycled coarse aggregates by pulsed power discharge","authors":"S. Narahara, T. Namihira, K. Nakashima, S. Inoue, S. Iizasa, S. Maeda, M. Shigeishi, M. Ohtsu, H. Akiyama","doi":"10.1109/PPPS.2007.4651948","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4651948","url":null,"abstract":"In Japan, the most of waste concrete scraps have been reused as roadbed materials and the recycling ratio of waste concrete scraps has been kept over 95 % from 2000. However, it is expected that the demands of waste concrete scraps as roadbed materials would decrease even though the waste concrete scraps increase with the pulling down buildings in next decade. These facts mean that the recycling of waste concrete scraps would be in the negative situation. Therefore, the development of new recycling technology of waste concrete scraps is paramount importance in Japan. In this work, the pulsed power discharges inside of waste concrete scraps immersed in water were used to reproduce the coarse aggregate. In the experiments, the Marx generator, which storages the energy of 6.4 kJ/Pulse, was used as pulsed power source and the point to hemisphere mesh electrode was immersed in water. The pulsed voltages with 400 kV of peak voltage were applied to the concrete scraps placed on hemisphere mesh and the reproduced coarse aggregates were evaluated after the repetitive discharge treatment. From the experimental results, it is found that the coarse aggregates reproduced by 40∼60 pulsed discharge treatments have the enough qualities of the bone-dry density and the water absorption rate to satisfy JIS (Japan Industrial Standard) regulation (A 5005). In addition, the concretes consisted of the reproduced coarse aggregate also have the enough compressed strength and Young’s module to utilize as the construction material.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126316990","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}
Pub Date : 2007-06-17DOI: 10.1109/PPPS.2007.4346319
T. Engel, J. Neri, M. Veracka
Helical coil electromagnetic launchers (HCEML’s) can operate at significantly lower currents and higher efficiency in comparison to conventional railgun and induction coilgun launchers. The HCEML’s versatility is due, in part, to its large inductance gradient which is typically 2 to 3 orders of magnitude greater than conventional railguns and can be tailored to practically any value in that range. The University of Missouri-Columbia (MU) has focused on the development of a low current, high efficiency launcher for low to medium velocity applications. To this end, MU has demonstrated a 40 mm bore × 750 mm length HCEML’s to launch ∼500 gram projectiles to 150 m/s operating at 12 to 15 kA peak currents, 400 to 800 V peak voltages, and measured efficiencies as high as 32%. While this particular HCEML used hollow-projectiles, present research efforts at MU are focused on the development of a solid-projectile HCEML. This investigation describes a 40 mm bore × 300 mm length solid-projectile HCEML. The goal of this research is to demonstrate the solid-projectile HCEML concept and to experimentally measure its performance.
{"title":"Solid-projectile helical coil electromagnetic launcher","authors":"T. Engel, J. Neri, M. Veracka","doi":"10.1109/PPPS.2007.4346319","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4346319","url":null,"abstract":"Helical coil electromagnetic launchers (HCEML’s) can operate at significantly lower currents and higher efficiency in comparison to conventional railgun and induction coilgun launchers. The HCEML’s versatility is due, in part, to its large inductance gradient which is typically 2 to 3 orders of magnitude greater than conventional railguns and can be tailored to practically any value in that range. The University of Missouri-Columbia (MU) has focused on the development of a low current, high efficiency launcher for low to medium velocity applications. To this end, MU has demonstrated a 40 mm bore × 750 mm length HCEML’s to launch ∼500 gram projectiles to 150 m/s operating at 12 to 15 kA peak currents, 400 to 800 V peak voltages, and measured efficiencies as high as 32%. While this particular HCEML used hollow-projectiles, present research efforts at MU are focused on the development of a solid-projectile HCEML. This investigation describes a 40 mm bore × 300 mm length solid-projectile HCEML. The goal of this research is to demonstrate the solid-projectile HCEML concept and to experimentally measure its performance.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125664821","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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