L. Schneider, K. Reed, H. Harjes, G. Pena, L. Martinez, M. Harden
Multi-kilojoule repetitive pulsed power technology moved from a laboratory environment into its first commercial application in 1997 as a driver for ion beam surface treatment. Sandia's RHEPP II (Repetitive High energy Pulsed Power), a repetitive 2.5 kJ/pulse electron beam accelerator, has supported the development of radiation treatment processes for polymers and elastomers, food products, and high dose-rate effects testing for defense programs since early 1996. Dos Lineas, an all solid-state testbed, has demonstrated synchronization techniques for parallel magnetic modulator systems and is continuing the development of design standards for long lifetime magnetic switches and voltage adders at a shot rate capability that exceeds 5/spl times/10/sup 6/ pulses per day. This paper describes progress in multi-kilojoule class repetitive pulsed power technology development, magnetic switching technology for modulator applications, and future research and development directions.
{"title":"Status of repetitive pulsed power at Sandia National Laboratories","authors":"L. Schneider, K. Reed, H. Harjes, G. Pena, L. Martinez, M. Harden","doi":"10.1109/PPC.1999.825525","DOIUrl":"https://doi.org/10.1109/PPC.1999.825525","url":null,"abstract":"Multi-kilojoule repetitive pulsed power technology moved from a laboratory environment into its first commercial application in 1997 as a driver for ion beam surface treatment. Sandia's RHEPP II (Repetitive High energy Pulsed Power), a repetitive 2.5 kJ/pulse electron beam accelerator, has supported the development of radiation treatment processes for polymers and elastomers, food products, and high dose-rate effects testing for defense programs since early 1996. Dos Lineas, an all solid-state testbed, has demonstrated synchronization techniques for parallel magnetic modulator systems and is continuing the development of design standards for long lifetime magnetic switches and voltage adders at a shot rate capability that exceeds 5/spl times/10/sup 6/ pulses per day. This paper describes progress in multi-kilojoule class repetitive pulsed power technology development, magnetic switching technology for modulator applications, and future research and development directions.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"18 1","pages":"523-527 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81033498","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}
F. Zutavern, G. Loubriel, A. Mar, H. Hjalmarson, W. Helgeson, G. J. Denison
High gain photoconductive semiconductor switches (PCSS) are being used to produce high power electromagnetic pulses for: (1) compact, repetitive accelerators; (2) ultra-wide band impulse sources; (3) precision gas switch triggers; (4) optically-activated firesets; and (5) high power optical pulse generation and control. High power, sub-nanosecond optical pulses are used for active optical sensors such as compact optical radars and range-gated/ballistic imaging systems. Following a brief introduction to high gain PCSS and its general applications, this paper focuses on PCSS for optical pulse generation and control. PCSS technology can be employed in three distinct approaches to optical pulse generation and control: (1) short pulse carrier injection to induce gain-switching in semiconductor lasers; (2) electro-optical Q-switching; and (3) optically activated Q-switching. The most significant PCSS issues for these applications are switch rise time, jitter and longevity. This paper describes both the requirements of these applications and the most recent results from PCSS technology. Experiments to understand and expand the limitations of high gain PCSS are also described.
{"title":"Photoconductive, semiconductor switch technology for short pulse electromagnetics and lasers","authors":"F. Zutavern, G. Loubriel, A. Mar, H. Hjalmarson, W. Helgeson, G. J. Denison","doi":"10.1109/PPC.1999.825469","DOIUrl":"https://doi.org/10.1109/PPC.1999.825469","url":null,"abstract":"High gain photoconductive semiconductor switches (PCSS) are being used to produce high power electromagnetic pulses for: (1) compact, repetitive accelerators; (2) ultra-wide band impulse sources; (3) precision gas switch triggers; (4) optically-activated firesets; and (5) high power optical pulse generation and control. High power, sub-nanosecond optical pulses are used for active optical sensors such as compact optical radars and range-gated/ballistic imaging systems. Following a brief introduction to high gain PCSS and its general applications, this paper focuses on PCSS for optical pulse generation and control. PCSS technology can be employed in three distinct approaches to optical pulse generation and control: (1) short pulse carrier injection to induce gain-switching in semiconductor lasers; (2) electro-optical Q-switching; and (3) optically activated Q-switching. The most significant PCSS issues for these applications are switch rise time, jitter and longevity. This paper describes both the requirements of these applications and the most recent results from PCSS technology. Experiments to understand and expand the limitations of high gain PCSS are also described.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"19 1","pages":"295-298 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90654457","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}
J. Lehr, C. Baum, W. Prather, J. Hull, M. Skipper, M. Abdalla, D. Giri
Applications for transient, high-voltage pulsed power technologies are on the increase. High-voltage resistors are an essential component of such systems, especially in the proof-of-concept and prototype testing. The authors have recently procured and tested certain resistor samples, supplied by Kanthal Globar and HVR Advanced Power Components. Results of a detailed evaluation of the HVR resistors are presented in this paper. Two types of HVR high-powered resistors have been tested to determine hold-off voltage, frequency variation and resistance to high voltage. The resistors were tested in a coaxial geometry driven by a two stage Marx generator. The voltage and current were measured by calibrated sensors. The high-voltage pulse resistance of each resistor is then determined on a pulse by pulse basis by dividing the maximum voltage by the maximum current in the time-domain. The two samples (HVR-10, HVR-12; washer type) were nominally 10 and 12 ohms with resistivity of 28 and 80 ohm-cm respectively. The variations in the low-voltage to pulsed high-voltage resistance were 9% for the HVR-10 and 18% for the HVR-12. With an average applied field of 65 kV/inch or 25.6 kV/cm, the resistors flashed in air, but not in pure SF/sub 6/ and N/sub 2//SF/sub 6/ mix. These resistors were found to be satisfactory for transient applications.
瞬态高压脉冲电源技术的应用正在增加。高压电阻器是此类系统的重要组成部分，特别是在概念验证和原型测试中。作者最近采购并测试了由Kanthal Globar和HVR Advanced Power Components提供的某些电阻器样品。本文给出了对HVR电阻器的详细评估结果。已经测试了两种类型的HVR大功率电阻器，以确定保持电压，频率变化和耐高压。电阻器在两级马克思发电机驱动的同轴几何结构下进行了测试。电压和电流由校准后的传感器测量。然后，通过将最大电压除以时域内的最大电流来确定每个电阻器的高压脉冲电阻。两个样本(HVR-10、HVR-12;垫圈型)标称为10欧姆和12欧姆，电阻率分别为28欧姆和80欧姆-厘米。HVR-10对脉冲高压电阻的变化为9%，HVR-12为18%。在65 kV/英寸或25.6 kV/cm的平均电场下，电阻器在空气中闪烁，但在纯SF/sub 6/和N/sub 2//SF/sub 6/混合中不闪烁。这些电阻器在瞬态应用中是令人满意的。
{"title":"Evaluation of resistors for transient high-voltage applications","authors":"J. Lehr, C. Baum, W. Prather, J. Hull, M. Skipper, M. Abdalla, D. Giri","doi":"10.1109/PPC.1999.823600","DOIUrl":"https://doi.org/10.1109/PPC.1999.823600","url":null,"abstract":"Applications for transient, high-voltage pulsed power technologies are on the increase. High-voltage resistors are an essential component of such systems, especially in the proof-of-concept and prototype testing. The authors have recently procured and tested certain resistor samples, supplied by Kanthal Globar and HVR Advanced Power Components. Results of a detailed evaluation of the HVR resistors are presented in this paper. Two types of HVR high-powered resistors have been tested to determine hold-off voltage, frequency variation and resistance to high voltage. The resistors were tested in a coaxial geometry driven by a two stage Marx generator. The voltage and current were measured by calibrated sensors. The high-voltage pulse resistance of each resistor is then determined on a pulse by pulse basis by dividing the maximum voltage by the maximum current in the time-domain. The two samples (HVR-10, HVR-12; washer type) were nominally 10 and 12 ohms with resistivity of 28 and 80 ohm-cm respectively. The variations in the low-voltage to pulsed high-voltage resistance were 9% for the HVR-10 and 18% for the HVR-12. With an average applied field of 65 kV/inch or 25.6 kV/cm, the resistors flashed in air, but not in pure SF/sub 6/ and N/sub 2//SF/sub 6/ mix. These resistors were found to be satisfactory for transient applications.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"121 1","pages":"666-669 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89872717","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}
D. Price, K. Childers, D. Kortbawi, P. Sincerny, C. Wellington, K. Ware
The Decade Quad NWE Simulator will be in operation at the Arnold Engineering and Development Center in the fall of 1999. In its initial configuration, its four identical modules (Marx, transfer capacitor, coaxial water line and conical MITL) each terminate in a plasma opening switch and large area bremsstrahlung (LAB) loads that combined will produce an X-ray dose of at least 16 krad (Si) over an area of at least 2250 cm/sup 2/. A validation test of the first conical MITL and POS load driven by the Decade Module 2 at Maxwell Physics International has successfully produced an X-ray dose consistent with these performance requirements. The initial assembly and check out of the Decade Quad pulsed power subsystems has been completed and is reported herein. Initial X-ray tests are currently underway.
{"title":"Initial operation of the Decade Quad in lab mode","authors":"D. Price, K. Childers, D. Kortbawi, P. Sincerny, C. Wellington, K. Ware","doi":"10.1109/PPC.1999.823711","DOIUrl":"https://doi.org/10.1109/PPC.1999.823711","url":null,"abstract":"The Decade Quad NWE Simulator will be in operation at the Arnold Engineering and Development Center in the fall of 1999. In its initial configuration, its four identical modules (Marx, transfer capacitor, coaxial water line and conical MITL) each terminate in a plasma opening switch and large area bremsstrahlung (LAB) loads that combined will produce an X-ray dose of at least 16 krad (Si) over an area of at least 2250 cm/sup 2/. A validation test of the first conical MITL and POS load driven by the Decade Module 2 at Maxwell Physics International has successfully produced an X-ray dose consistent with these performance requirements. The initial assembly and check out of the Decade Quad pulsed power subsystems has been completed and is reported herein. Initial X-ray tests are currently underway.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"40 1","pages":"1095-1098 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89878154","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. Gaudreau, J. Casey, T. Hawkey, M. Kempkes, J. Mulvaney
Hundreds of radar systems in US DoD and commercial operation today utilize tetrodes or thyratrons/PFNs for high PRF (pulse repetition frequency) pulse modulation. These vacuum tube modulators are expensive to maintain, and their relatively short lifetime constitutes a significant operational expense. DTI of Bedford, MA, USA, with support, from the Office of Naval Research and the Naval Surface Warfare Center, has built high voltage, compact, solid state modulators with applications in a wide variety of radar systems. The new modulator technology significantly increase the performance and reliability of high PRF radar systems.
{"title":"Compact, solid state, high PRF radar modulators","authors":"M. Gaudreau, J. Casey, T. Hawkey, M. Kempkes, J. Mulvaney","doi":"10.1109/PPC.1999.823634","DOIUrl":"https://doi.org/10.1109/PPC.1999.823634","url":null,"abstract":"Hundreds of radar systems in US DoD and commercial operation today utilize tetrodes or thyratrons/PFNs for high PRF (pulse repetition frequency) pulse modulation. These vacuum tube modulators are expensive to maintain, and their relatively short lifetime constitutes a significant operational expense. DTI of Bedford, MA, USA, with support, from the Office of Naval Research and the Naval Surface Warfare Center, has built high voltage, compact, solid state modulators with applications in a wide variety of radar systems. The new modulator technology significantly increase the performance and reliability of high PRF radar systems.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"4 1","pages":"795-798 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78079334","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 goal of the RTMIX series on Pegasus is to study Rayleigh-Taylor instability growth and mixing in a convergent geometry, at a metal-foam interface, as a function of material strength and initial perturbation amplitude. Results of three experiments are presented. The first experiment, reported in the previous Pulsed Power Conference, involved a solid Z-pinch liner driven by a Pegasus current of /spl sim/5.5 MA onto a high-density foam target. The inside diameter of the liner was smooth for the first experiment. No instability growth or mixing was observed at the resolution limit of the diagnostics, as expected. In the second experiment, azimuthally symmetric sine-wave perturbations were machined onto the inner diameter with a wavelength of 1.0 mm and amplitudes of 12.5 /spl mu/m and 50 /spl mu/m. Growth of the large amplitude perturbations was predicted, but growth of the small amplitude perturbations was expected to be inhibited by the material strength of the Cu. Neither amplitude perturbation grew. The third experiment was a repeat of the second with a low-strength Sn/In alloy (in place of the Cu) that should have melted early in the implosion. The Sn/In layer was mass-matched to the Cu layer that it replaced. Since the Sn/In layer was expected to be liquid during the unstable deceleration phase, no material strength stabilization should have occurred, and both amplitude perturbations should have shown dramatic growth. Preliminary inspection of radiographs from this experiment indicates no Rayleigh-Taylor instability growth.
{"title":"Rayleigh-Taylor instability growth enigma: liner studies on Pegasus","authors":"M. Sheppard, W. Atchison, R. Keinigs, J. Stokes","doi":"10.1109/PPC.1999.823659","DOIUrl":"https://doi.org/10.1109/PPC.1999.823659","url":null,"abstract":"The goal of the RTMIX series on Pegasus is to study Rayleigh-Taylor instability growth and mixing in a convergent geometry, at a metal-foam interface, as a function of material strength and initial perturbation amplitude. Results of three experiments are presented. The first experiment, reported in the previous Pulsed Power Conference, involved a solid Z-pinch liner driven by a Pegasus current of /spl sim/5.5 MA onto a high-density foam target. The inside diameter of the liner was smooth for the first experiment. No instability growth or mixing was observed at the resolution limit of the diagnostics, as expected. In the second experiment, azimuthally symmetric sine-wave perturbations were machined onto the inner diameter with a wavelength of 1.0 mm and amplitudes of 12.5 /spl mu/m and 50 /spl mu/m. Growth of the large amplitude perturbations was predicted, but growth of the small amplitude perturbations was expected to be inhibited by the material strength of the Cu. Neither amplitude perturbation grew. The third experiment was a repeat of the second with a low-strength Sn/In alloy (in place of the Cu) that should have melted early in the implosion. The Sn/In layer was mass-matched to the Cu layer that it replaced. Since the Sn/In layer was expected to be liquid during the unstable deceleration phase, no material strength stabilization should have occurred, and both amplitude perturbations should have shown dramatic growth. Preliminary inspection of radiographs from this experiment indicates no Rayleigh-Taylor instability growth.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"35 1","pages":"892-895 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78420877","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}
Futuristic weapon systems, including lasers, high power microwave systems, and electric guns may have potential to substantially increase capability to defeat enemy forces with significantly less logistics burden. However, a vast majority of the military community does not project that these weapons will be incorporated into the designs of ground combat platforms in the near future. The major barrier preventing advanced concepts from being weaponized is the lack of compact pulsed power systems required for operating them. The DARPA Combat Hybrid Power Systems (CHPS) program was established to investigate hybrid electric power systems that might provide all the energy and power needs of improved future combat vehicles specifically the transient, continuous and pulsed power necessary to drive advanced weapons systems, mobility systems, communications systems and protective systems. By exploiting the benefits of hybrid power, power management and power sharing, it may become possible to design future combat vehicles with advanced weapons and protection systems, while reducing logistical requirements (by increasing efficiency) and reducing overall weight and volume. This paper describes the CHPS program goals and accomplishments as well as provide insight on how the CHPS approach to design of future vehicles is an essential step toward demonstrating lightweight, future ground combat vehicles capable of improved mobility, lethality, survivability and sustainability.
{"title":"Hybrid power-an enabling technology for future combat systems","authors":"M.M. Freeman, M. Perschbacher","doi":"10.1109/PPC.1999.825416","DOIUrl":"https://doi.org/10.1109/PPC.1999.825416","url":null,"abstract":"Futuristic weapon systems, including lasers, high power microwave systems, and electric guns may have potential to substantially increase capability to defeat enemy forces with significantly less logistics burden. However, a vast majority of the military community does not project that these weapons will be incorporated into the designs of ground combat platforms in the near future. The major barrier preventing advanced concepts from being weaponized is the lack of compact pulsed power systems required for operating them. The DARPA Combat Hybrid Power Systems (CHPS) program was established to investigate hybrid electric power systems that might provide all the energy and power needs of improved future combat vehicles specifically the transient, continuous and pulsed power necessary to drive advanced weapons systems, mobility systems, communications systems and protective systems. By exploiting the benefits of hybrid power, power management and power sharing, it may become possible to design future combat vehicles with advanced weapons and protection systems, while reducing logistical requirements (by increasing efficiency) and reducing overall weight and volume. This paper describes the CHPS program goals and accomplishments as well as provide insight on how the CHPS approach to design of future vehicles is an essential step toward demonstrating lightweight, future ground combat vehicles capable of improved mobility, lethality, survivability and sustainability.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"64 1","pages":"17-22 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75025266","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}
B. Novac, I. Smith, S. Goh, M. Enache, K. Gregory, P. Senior, R. J. Cliffe, R. Burke, H. Stewardson
The paper presents the basic concepts that underlie an EPSRC funded research activity initiated at Loughborough University. A novel technique is described that enables the so termed shock wave driven flux compression process to be performed inside a laboratory, without the use of any high-explosive charge, and results from preliminary proof of principle experiments are analysed. Details of the necessary ancillary equipment, such as fast (TA/s) generators, electric guns, high voltage resistors, high voltage vacuum helical transformers and specific transducers are presented, together with a study of the dielectric/metallic phase transition in aluminium powder. The paper concludes by showing how the different concepts can be combined, leading to a high-voltage pulse generator with a fast-rising output.
{"title":"A novel flux compression/dynamic transformer technique for high-voltage pulse generation","authors":"B. Novac, I. Smith, S. Goh, M. Enache, K. Gregory, P. Senior, R. J. Cliffe, R. Burke, H. Stewardson","doi":"10.1109/PPC.1999.825481","DOIUrl":"https://doi.org/10.1109/PPC.1999.825481","url":null,"abstract":"The paper presents the basic concepts that underlie an EPSRC funded research activity initiated at Loughborough University. A novel technique is described that enables the so termed shock wave driven flux compression process to be performed inside a laboratory, without the use of any high-explosive charge, and results from preliminary proof of principle experiments are analysed. Details of the necessary ancillary equipment, such as fast (TA/s) generators, electric guns, high voltage resistors, high voltage vacuum helical transformers and specific transducers are presented, together with a study of the dielectric/metallic phase transition in aluminium powder. The paper concludes by showing how the different concepts can be combined, leading to a high-voltage pulse generator with a fast-rising output.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"33 1","pages":"343-346 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75188184","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}
R. Faehl, W. Atchison, R. Keinigs, I. Lindemuth, R. Reinovsky
We present computational studies on the use of colliding shell configurations to mitigate the effects of magnetic Rayleigh-Taylor (MRT) on the inner liner. Two-dimensional MHD calculations of liners have been performed that have pre-formed, single wavelength perturbations. Specifying the perturbation allows us to follow the evolution of a specific disturbance with little ambiguity. This technique has been confirmed in numerous experiments on the PEGASUS II machine. An inner liner is located at a smaller radius than the outer, driver liner. The radius is chosen so that the perturbation will grow to large amplitude before impact. To minimize shock effects, a low-density pad is placed between the two liners. This pad may be either plastic or a magnetic field. Results of the computational study are presented.
{"title":"Study of colliding-shell configurations to reduce the effects of magnetic Rayleigh-Taylor on imploding liners","authors":"R. Faehl, W. Atchison, R. Keinigs, I. Lindemuth, R. Reinovsky","doi":"10.1109/PPC.1999.825488","DOIUrl":"https://doi.org/10.1109/PPC.1999.825488","url":null,"abstract":"We present computational studies on the use of colliding shell configurations to mitigate the effects of magnetic Rayleigh-Taylor (MRT) on the inner liner. Two-dimensional MHD calculations of liners have been performed that have pre-formed, single wavelength perturbations. Specifying the perturbation allows us to follow the evolution of a specific disturbance with little ambiguity. This technique has been confirmed in numerous experiments on the PEGASUS II machine. An inner liner is located at a smaller radius than the outer, driver liner. The radius is chosen so that the perturbation will grow to large amplitude before impact. To minimize shock effects, a low-density pad is placed between the two liners. This pad may be either plastic or a magnetic field. Results of the computational study are presented.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"14 1","pages":"373-376 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75339894","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}
V. A. Arinin, V. Buzin, A. Buyko, V. Burtsev, V. Chernyshev, B. E. Grinevich, G. G. Ivanova, A. Kovtun, A. Kuzaev, Yu. M. Makarov, Y.I. Matsev, I. V. Morozov, P. N. Nizovtsev, S. V. Pak, A. Petrukhin, A. N. Skobelev, V. Soloviev, V. N. Sofronov, V. B. Yakubov, E. I. Zharinov, I. Lindemuth, R. Reinovsky, R. Faehl, W. Atchison
Good longitudinal symmetry of magnetically driven metal cylindrical liners may be observed at a relatively short time of current rise, for example, in experiments at PEGASUS-2 facility. Because of interaction of the liner with current-conducting edge walls the symmetry of compression may be much worse in experiments with a longer rise time of current delivered by explosive magnetic generators (EMG). The present paper describes the results of study of near-wall effects negative influence on longitudinal symmetry of compression of liners, close in design to experiments at PEGASUS-2 facility, but at an order higher duration of current supplied by helical EMG. The work was conducted within the frames of liner technology program (LT-1 experiments).
{"title":"Near-wall effects influence on longitudinal symmetry of a solid liner compressed by a slowly increasing EMG current","authors":"V. A. Arinin, V. Buzin, A. Buyko, V. Burtsev, V. Chernyshev, B. E. Grinevich, G. G. Ivanova, A. Kovtun, A. Kuzaev, Yu. M. Makarov, Y.I. Matsev, I. V. Morozov, P. N. Nizovtsev, S. V. Pak, A. Petrukhin, A. N. Skobelev, V. Soloviev, V. N. Sofronov, V. B. Yakubov, E. I. Zharinov, I. Lindemuth, R. Reinovsky, R. Faehl, W. Atchison","doi":"10.1109/PPC.1999.823656","DOIUrl":"https://doi.org/10.1109/PPC.1999.823656","url":null,"abstract":"Good longitudinal symmetry of magnetically driven metal cylindrical liners may be observed at a relatively short time of current rise, for example, in experiments at PEGASUS-2 facility. Because of interaction of the liner with current-conducting edge walls the symmetry of compression may be much worse in experiments with a longer rise time of current delivered by explosive magnetic generators (EMG). The present paper describes the results of study of near-wall effects negative influence on longitudinal symmetry of compression of liners, close in design to experiments at PEGASUS-2 facility, but at an order higher duration of current supplied by helical EMG. The work was conducted within the frames of liner technology program (LT-1 experiments).","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"119 1","pages":"880-883 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77955131","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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