Pub Date : 2007-06-17DOI: 10.1109/PPPS.2007.4346163
P. Arnold, S. Hulsey, G. Ullery, D. Petersen, D. Pendleton, C. Ollis, M. Newton, T. Harwell, D. Cordoza, L. Hadovski
The NIF Power Conditioning System provides the pulsed excitation required to drive flashlamps in the laser’s optical amplifiers. Modular in design, each of the 192 Main Energy Storage Modules (MESMs) storage up to 2.2 MJ of electrical energy in its capacitor bank before delivering the energy to 20 pairs of flashlamps in a 400 μs pulse (10% power points). The peak current of each MESM discharge is 0.5 MA. Production, installation, commissioning and operation of the NIF Power Conditioning continue to progress rapidly, with the goals of completing accelerated production in late 2007 and finishing commissioning by early 2008, all the while maintaining an aggressive operations schedule. To date, more than 80% of the required modules have been assembled, shipped and installed in the facility, representing more that 240 MJ of stored energy available for driving NIF flashlamps. The MESMs have displayed outstanding reliability during daily, multiple-shift operations.
{"title":"Status of the NIF power conditioning system","authors":"P. Arnold, S. Hulsey, G. Ullery, D. Petersen, D. Pendleton, C. Ollis, M. Newton, T. Harwell, D. Cordoza, L. Hadovski","doi":"10.1109/PPPS.2007.4346163","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4346163","url":null,"abstract":"The NIF Power Conditioning System provides the pulsed excitation required to drive flashlamps in the laser’s optical amplifiers. Modular in design, each of the 192 Main Energy Storage Modules (MESMs) storage up to 2.2 MJ of electrical energy in its capacitor bank before delivering the energy to 20 pairs of flashlamps in a 400 μs pulse (10% power points). The peak current of each MESM discharge is 0.5 MA. Production, installation, commissioning and operation of the NIF Power Conditioning continue to progress rapidly, with the goals of completing accelerated production in late 2007 and finishing commissioning by early 2008, all the while maintaining an aggressive operations schedule. To date, more than 80% of the required modules have been assembled, shipped and installed in the facility, representing more that 240 MJ of stored energy available for driving NIF flashlamps. The MESMs have displayed outstanding reliability during daily, multiple-shift operations.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"5 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":"128969364","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.2007.4651962
N. Bruner, C. Mostrom, D. Rose, D. Welch, V. Bailey, D. Johnson, B. Oliver
Sandia National Laboratories’ Radiographic Integrated Test Stand (RITS-6) is a six-cell inductive voltage adder accelerator designed to produce currents of 186 kA at 7.8 MV in 70 ns in its low-impedance configuration. The six inductive-adder cells are connected in series to a coaxial magnetically insulated transmission line. Each cell has a single point feed to an azimuthal transmission line which distributes the pulse around the cell bore. To understand the extent to which power is distributed symmetrically around the coaxial transmission line and its effect on electron power flow downstream, particle-in-cell simulations were used to model the entire RITS-6 transmission line in 3D from pulse forming circuit to the diode load. Simulation results show electron flow current to be asymmetric by 16% at the exit to the sixth cell, but 3% or less at diagnostic positions near the load. Magnetic insulation in the trans-mission line does not appear to be impacted by the asymmetry, though flow impedance is not uniform axially.
{"title":"Modeling the RITS-6 transmission line","authors":"N. Bruner, C. Mostrom, D. Rose, D. Welch, V. Bailey, D. Johnson, B. Oliver","doi":"10.1109/PPPS.2007.4651962","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4651962","url":null,"abstract":"Sandia National Laboratories’ Radiographic Integrated Test Stand (RITS-6) is a six-cell inductive voltage adder accelerator designed to produce currents of 186 kA at 7.8 MV in 70 ns in its low-impedance configuration. The six inductive-adder cells are connected in series to a coaxial magnetically insulated transmission line. Each cell has a single point feed to an azimuthal transmission line which distributes the pulse around the cell bore. To understand the extent to which power is distributed symmetrically around the coaxial transmission line and its effect on electron power flow downstream, particle-in-cell simulations were used to model the entire RITS-6 transmission line in 3D from pulse forming circuit to the diode load. Simulation results show electron flow current to be asymmetric by 16% at the exit to the sixth cell, but 3% or less at diagnostic positions near the load. Magnetic insulation in the trans-mission line does not appear to be impacted by the asymmetry, though flow impedance is not uniform axially.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"21 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":"129431152","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.2007.4651860
J. F. Camacho, E. Ruden
We present the design of a four-chord laser interferometer system operating at 633 nm that will measure the electron density of field-reversed configurations (FRCs) produced by the magnetized target fusion (MTF) experiment at the Air Force Research Laboratory. The design is a modified version of an eight-chord system previously used to provide time-resolved information about the spatial distribution of electron density in a similar FRC experiment. With the current system, a fanned array of laser beams will probe the plasma through the FRC midplane along four different chords, and the optical phase shift of each beam relative to a reference beam will be used to infer the line integrated electron density. In addition, a new feature of our design will be the option of diverting any or all of the four probe beams into single-mode optical fibers whose collimated outputs can be used to probe different axial locations simultaneously. This fiber-optic probe beam modification will enable us to place the interferometer system’s optical table at a safe distance from the MTF-FRC experiment when destructive tests involving plasma compression by a solid metal liner imploded by the Shiva Star capacitor bank are attempted.
{"title":"Design of a multichord optical interferometer with an axial fiber-optic probe to measure electron density in a field-reversed configuration","authors":"J. F. Camacho, E. Ruden","doi":"10.1109/PPPS.2007.4651860","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4651860","url":null,"abstract":"We present the design of a four-chord laser interferometer system operating at 633 nm that will measure the electron density of field-reversed configurations (FRCs) produced by the magnetized target fusion (MTF) experiment at the Air Force Research Laboratory. The design is a modified version of an eight-chord system previously used to provide time-resolved information about the spatial distribution of electron density in a similar FRC experiment. With the current system, a fanned array of laser beams will probe the plasma through the FRC midplane along four different chords, and the optical phase shift of each beam relative to a reference beam will be used to infer the line integrated electron density. In addition, a new feature of our design will be the option of diverting any or all of the four probe beams into single-mode optical fibers whose collimated outputs can be used to probe different axial locations simultaneously. This fiber-optic probe beam modification will enable us to place the interferometer system’s optical table at a safe distance from the MTF-FRC experiment when destructive tests involving plasma compression by a solid metal liner imploded by the Shiva Star capacitor bank are attempted.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"1 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":"129662136","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}
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.2007.4345636
K. Takaki, T. Sato, S. Mukaigawa, T. Fujiwara
An influence of initial NO concentration on NO removal was studied experimentally using two different applied voltage waveforms. Several hundreds ppm of NO was diluted with N2 and O2 gas mixture and was fed to a dielectric barrier discharge reactor. NO removal depended on initial NO concentration at sinusoidal voltage, whereas NO removal showed the same value for various initial NO concentrations at pulse voltage.
{"title":"Influence of no initial concentration on removal efficiency in dielectric barrier discharge reactor","authors":"K. Takaki, T. Sato, S. Mukaigawa, T. Fujiwara","doi":"10.1109/PPPS.2007.4345636","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345636","url":null,"abstract":"An influence of initial NO concentration on NO removal was studied experimentally using two different applied voltage waveforms. Several hundreds ppm of NO was diluted with N2 and O2 gas mixture and was fed to a dielectric barrier discharge reactor. NO removal depended on initial NO concentration at sinusoidal voltage, whereas NO removal showed the same value for various initial NO concentrations at pulse voltage.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"14 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":"121251291","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.2007.4345786
N. Seddon, C. Spikings, J. E. Dolan
This paper describes a novel pulse forming technique that has been developed to produce powerful RF signals in short duration pulses. The technique is based on modulation of a flat top ‘video’ pulse by a nonlinear dispersive transmission line (NLTL). Typical parameters for existing equipment are - centre frequency 1GHz, pulse length 30ns, peak power 20MW and pulse repetition rate 1kHz. The circuits are electronically tuneable by ±20% about the centre frequency and can be operated in phased arrays. This technology provides a route to produce very powerful microwave transmitters with high repetition rate, electronic tunability and electronic beam steering.
{"title":"RF pulse formation in nonlinear transmission lines","authors":"N. Seddon, C. Spikings, J. E. Dolan","doi":"10.1109/PPPS.2007.4345786","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345786","url":null,"abstract":"This paper describes a novel pulse forming technique that has been developed to produce powerful RF signals in short duration pulses. The technique is based on modulation of a flat top ‘video’ pulse by a nonlinear dispersive transmission line (NLTL). Typical parameters for existing equipment are - centre frequency 1GHz, pulse length 30ns, peak power 20MW and pulse repetition rate 1kHz. The circuits are electronically tuneable by ±20% about the centre frequency and can be operated in phased arrays. This technology provides a route to produce very powerful microwave transmitters with high repetition rate, electronic tunability and electronic beam steering.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"22 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":"122216321","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.2007.4346150
J. Jeništa, M. Bartlová, V. Aubrecht
Numerical investigation of radiation properties in the worldwide unique type of thermal plasma generator with water vortex stabilization (Gerdien arc) and combined stabilization of arc by argon (Ar) flow and water vortex (the so called hybrid arc) has been carried out. A twodimensional axisymmetric numerical model describes the region between the inlet and outlet nozzles in the arc discharge chamber. It is assumed that plasma flow is steady, laminar, compressible and in the state of local thermodynamic equilibrium. The governing equations are solved numerically by the Finite Volume Method. Here we study the contribution of water molecular species and of ∼ 3 500 newly-included Ar lines on radiation transport within the discharge region of water and hybrid arcs. Radiation loss from the arc is calculated by the partial characteristics method for atmospheric pressure water and argon-water discharges. In contrast to our previously published results, band spectra of H2, O2, OH molecules and re-calculated Ar line spectrum have been included in the partial characteristics. Results carried out for 150–600 A and for Ar mass flow rates of 7.5–27.5 slm proved that reabsorption in water plasma increases of about 3.5% for all currents but decreases remarkably in the hybrid plasma. For a given current and increasing mass flow rate of Ar reabsorption decreases. Comparison between present calculation and available experiments shows good agreement.
{"title":"The impact of molecular radiation processes in water plasma on performance of water-vortex and hybridstabilized electric arcs","authors":"J. Jeništa, M. Bartlová, V. Aubrecht","doi":"10.1109/PPPS.2007.4346150","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4346150","url":null,"abstract":"Numerical investigation of radiation properties in the worldwide unique type of thermal plasma generator with water vortex stabilization (Gerdien arc) and combined stabilization of arc by argon (Ar) flow and water vortex (the so called hybrid arc) has been carried out. A twodimensional axisymmetric numerical model describes the region between the inlet and outlet nozzles in the arc discharge chamber. It is assumed that plasma flow is steady, laminar, compressible and in the state of local thermodynamic equilibrium. The governing equations are solved numerically by the Finite Volume Method. Here we study the contribution of water molecular species and of ∼ 3 500 newly-included Ar lines on radiation transport within the discharge region of water and hybrid arcs. Radiation loss from the arc is calculated by the partial characteristics method for atmospheric pressure water and argon-water discharges. In contrast to our previously published results, band spectra of H2, O2, OH molecules and re-calculated Ar line spectrum have been included in the partial characteristics. Results carried out for 150–600 A and for Ar mass flow rates of 7.5–27.5 slm proved that reabsorption in water plasma increases of about 3.5% for all currents but decreases remarkably in the hybrid plasma. For a given current and increasing mass flow rate of Ar reabsorption decreases. Comparison between present calculation and available experiments shows good agreement.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"5 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":"125856923","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.2007.4345986
K. Nielsen, J. Barraza, M. Kang, B. Prichard
The Dual-Axis Radiographic Hydrodynamics Test (DARHT) facility will employ two perpendicular electron Linear Induction Accelerators to produce intense, bremsstrahlung x-ray pulses for flash radiography. The second axis, DARHT II [1], features a 2.5-MeV injector and a 15.5-MeV, 2-kA, 1.6-microsecond accelerator consisting of 74 induction cells and drivers. Major induction cell components include high flux swing magnetic material (Metglas 2605SC) and a Mycalex™ insulator. The cell drivers are pulse forming networks (PFNs). The DARHT II accelerator cells have undergone a series of test and modeling efforts to fully understand their operational parameters. These R&D efforts identified problems in the original cell design and means to upgrade the design, performance and reliability of the linear induction cells [2]. Physical changes in the cell oil region, the cell vacuum region, and the cell drivers, together with different operational and maintenance procedures, have been implemented in the refurbished units resulting in greatly enhanced cell performance and reliability. All 74 cells have now been refurbished and tested for acceptance. This paper gives the results of those tests and the performance of the 26 refurbished cells in the Scaled Accelerator.
{"title":"Performance of the DARHT second axis induction cells","authors":"K. Nielsen, J. Barraza, M. Kang, B. Prichard","doi":"10.1109/PPPS.2007.4345986","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345986","url":null,"abstract":"The Dual-Axis Radiographic Hydrodynamics Test (DARHT) facility will employ two perpendicular electron Linear Induction Accelerators to produce intense, bremsstrahlung x-ray pulses for flash radiography. The second axis, DARHT II [1], features a 2.5-MeV injector and a 15.5-MeV, 2-kA, 1.6-microsecond accelerator consisting of 74 induction cells and drivers. Major induction cell components include high flux swing magnetic material (Metglas 2605SC) and a Mycalex™ insulator. The cell drivers are pulse forming networks (PFNs). The DARHT II accelerator cells have undergone a series of test and modeling efforts to fully understand their operational parameters. These R&D efforts identified problems in the original cell design and means to upgrade the design, performance and reliability of the linear induction cells [2]. Physical changes in the cell oil region, the cell vacuum region, and the cell drivers, together with different operational and maintenance procedures, have been implemented in the refurbished units resulting in greatly enhanced cell performance and reliability. All 74 cells have now been refurbished and tested for acceptance. This paper gives the results of those tests and the performance of the 26 refurbished cells in the Scaled Accelerator.","PeriodicalId":275106,"journal":{"name":"2007 16th IEEE International Pulsed Power Conference","volume":"21 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":"129377729","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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