Pub Date : 2017-06-01DOI: 10.1109/PPC.2017.8291101
A. Gritsuk, V. Aleksandrov, I. Frolov, E. Grabovskiy, A. Gribov, Y. Lauhin, K. Mitrofanov, G. Oleinik, A. Samohin, A. Shishlov
Implosion of quasi-spherical wire arrays opens the possibility of more efficient use of the kinetic energy of the material being compressed to create a source of soft X-rays (SXR), compared to two-dimensional compression in the case of a cylindrical wire array. This is due to the contribution of the kinetic energy of the axial movement of the plasma into the internal energy of SXR source. The purpose of the experiments was to achieve threedimensional synchronous compression of the plasma in the geometric center of a quasi-spherical array. For the optimal linear mass profile (ml(θ) = mfsinθ), it follows from the measured distribution of the azimuthal magnetic field that, in the stage of plasma production up to the SXR pulse, the plasma with the frozen-in magnetic field penetrates the array from the polar and equatorial regions almost synchronously. The size and shape of the X-ray radiation source in quasi-spherical current implosion were inferred from plasma emission spectrum measurement with spatial resolution and registration of framing X-ray images. Estimation of the radiation flux on the surface of such a source was received.
{"title":"The study of three-dimensional compression of wire arrays at the angara-5-1 facility","authors":"A. Gritsuk, V. Aleksandrov, I. Frolov, E. Grabovskiy, A. Gribov, Y. Lauhin, K. Mitrofanov, G. Oleinik, A. Samohin, A. Shishlov","doi":"10.1109/PPC.2017.8291101","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291101","url":null,"abstract":"Implosion of quasi-spherical wire arrays opens the possibility of more efficient use of the kinetic energy of the material being compressed to create a source of soft X-rays (SXR), compared to two-dimensional compression in the case of a cylindrical wire array. This is due to the contribution of the kinetic energy of the axial movement of the plasma into the internal energy of SXR source. The purpose of the experiments was to achieve threedimensional synchronous compression of the plasma in the geometric center of a quasi-spherical array. For the optimal linear mass profile (ml(θ) = mfsinθ), it follows from the measured distribution of the azimuthal magnetic field that, in the stage of plasma production up to the SXR pulse, the plasma with the frozen-in magnetic field penetrates the array from the polar and equatorial regions almost synchronously. The size and shape of the X-ray radiation source in quasi-spherical current implosion were inferred from plasma emission spectrum measurement with spatial resolution and registration of framing X-ray images. Estimation of the radiation flux on the surface of such a source was received.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127882430","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 : 2017-06-01DOI: 10.1109/PPC.2017.8291228
Yoshihiro Sato, Keita Watanabe, Y. Minamitani
Pulsed power discharge in water is studied for advanced water treatment technology. The pulsed power generates streamer like discharge in water. The streamer discharge generates many active species (ozone, OH radical, ultraviolet rays etc.). All of them could be utilized to the decomposition of organic substances in water. However, to generate uniform streamer discharge is difficult in water because breakdown voltage in water is high. This phenomenon decreases efficiency of the water treatment. Therefore we are studying the water treatment method that contaminated water is sprayed as droplets from the top into the reactor that generates pulsed plasma in gaseous phase. The feature of our system is that contaminated water is sprayed as droplets from the top into the reactor that generates pulsed plasma in gaseous phase. Contaminated water reacts with active species in the streamer discharge directly. Hence this method has so much high efficiency for the water treatment. However, since OH radical that has short lifetime is generated near the streamer, some OH radicals would react before the reaction to the droplets. In this study, we designed a new reactor that the pulsed discharge occurs on the surface of the water droplets. By this design, it has been observed to improve the energy efficiency for water treatment. In other words, it is possible to decompose the organic substances in water with less energy and to come faster treatment.
{"title":"The improvement of energy efficiency by generating hydroxyl radical on the surface of droplets for the water treatment using pulsed power discharge","authors":"Yoshihiro Sato, Keita Watanabe, Y. Minamitani","doi":"10.1109/PPC.2017.8291228","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291228","url":null,"abstract":"Pulsed power discharge in water is studied for advanced water treatment technology. The pulsed power generates streamer like discharge in water. The streamer discharge generates many active species (ozone, OH radical, ultraviolet rays etc.). All of them could be utilized to the decomposition of organic substances in water. However, to generate uniform streamer discharge is difficult in water because breakdown voltage in water is high. This phenomenon decreases efficiency of the water treatment. Therefore we are studying the water treatment method that contaminated water is sprayed as droplets from the top into the reactor that generates pulsed plasma in gaseous phase. The feature of our system is that contaminated water is sprayed as droplets from the top into the reactor that generates pulsed plasma in gaseous phase. Contaminated water reacts with active species in the streamer discharge directly. Hence this method has so much high efficiency for the water treatment. However, since OH radical that has short lifetime is generated near the streamer, some OH radicals would react before the reaction to the droplets. In this study, we designed a new reactor that the pulsed discharge occurs on the surface of the water droplets. By this design, it has been observed to improve the energy efficiency for water treatment. In other words, it is possible to decompose the organic substances in water with less energy and to come faster treatment.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"31 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120933304","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 : 2017-06-01DOI: 10.1109/PPC.2017.8291296
R. Fujita, Y. Nagata, D. Wang, T. Namihira
Pulsed streamer discharge plasma, a type of non-thermal plasma, is known to generate various chemically active species and as such is applied to many fields such as water quality improvement and ozone generation. However, detailed physical properties of streamer discharge remain unclear. Therefore, basic research on pulsed streamer discharge is necessary. Previous studies have shown that voltage rise rates greatly influence streamer discharge, but few reports have focused on this. While peak voltage tends to vary under the influence of voltage rise rates, research to date has generally utilized an unfixed peak voltage. This study investigates discharge propagation phenomena at a fixed peak voltage under various voltage rise rates using an ICCD camera. In the experiment, a pulsed voltage with a duration of 100 ns was created using Blumlein lines and applied to a needle-hemisphere electrode. The applied peak voltage was about 71 kV with the electrode gap set at 24 mm as measured from the top of the needle to hemisphere surface. A decrease in the number of winding coils from 5 to 0 resulted in a pulsed voltage rise rate increased from 0.61 to 1.21 kV/ns. Important results are as follows. (1) The ending time of streamer head propagation was delayed, and the voltage at that time increased from 53.1 to 61.0 kV. (2) Streamer head velocity on average increased from 0.45 to 0.58 mm/ns. (3) Brightness value increase at the end of streamer head propagation. Our experimental results elucidate the relationship of pulsed voltage rise rate to various streamer discharge parameters. We conclude that pulsed voltage rise rate has a great influence on the physical characteristics of streamer discharge.
{"title":"Effects of pulsed voltage rise rate on pulsed streamer discharge","authors":"R. Fujita, Y. Nagata, D. Wang, T. Namihira","doi":"10.1109/PPC.2017.8291296","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291296","url":null,"abstract":"Pulsed streamer discharge plasma, a type of non-thermal plasma, is known to generate various chemically active species and as such is applied to many fields such as water quality improvement and ozone generation. However, detailed physical properties of streamer discharge remain unclear. Therefore, basic research on pulsed streamer discharge is necessary. Previous studies have shown that voltage rise rates greatly influence streamer discharge, but few reports have focused on this. While peak voltage tends to vary under the influence of voltage rise rates, research to date has generally utilized an unfixed peak voltage. This study investigates discharge propagation phenomena at a fixed peak voltage under various voltage rise rates using an ICCD camera. In the experiment, a pulsed voltage with a duration of 100 ns was created using Blumlein lines and applied to a needle-hemisphere electrode. The applied peak voltage was about 71 kV with the electrode gap set at 24 mm as measured from the top of the needle to hemisphere surface. A decrease in the number of winding coils from 5 to 0 resulted in a pulsed voltage rise rate increased from 0.61 to 1.21 kV/ns. Important results are as follows. (1) The ending time of streamer head propagation was delayed, and the voltage at that time increased from 53.1 to 61.0 kV. (2) Streamer head velocity on average increased from 0.45 to 0.58 mm/ns. (3) Brightness value increase at the end of streamer head propagation. Our experimental results elucidate the relationship of pulsed voltage rise rate to various streamer discharge parameters. We conclude that pulsed voltage rise rate has a great influence on the physical characteristics of streamer discharge.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115609195","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 : 2017-06-01DOI: 10.1109/PPC.2017.8291259
Jihao Jiang, Lin Chen, Feng Li, Meng Wang
The pulsed-power accelerator uses its parallel branches triggered to shape the load-current pulse as required for a material physics experiment. We obtained the energy efficiencies with the source impedance and the load impedance in any branches triggered sequence. It is found that the energy efficiencies is only depend for the pulsed power accelerator impedance and the load impedance for any order of the branches triggered. And it is the highest when they are equaled.
{"title":"Impedance matching of pulsed power accelerator for megajoule-class dynamic-material-physics experiments","authors":"Jihao Jiang, Lin Chen, Feng Li, Meng Wang","doi":"10.1109/PPC.2017.8291259","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291259","url":null,"abstract":"The pulsed-power accelerator uses its parallel branches triggered to shape the load-current pulse as required for a material physics experiment. We obtained the energy efficiencies with the source impedance and the load impedance in any branches triggered sequence. It is found that the energy efficiencies is only depend for the pulsed power accelerator impedance and the load impedance for any order of the branches triggered. And it is the highest when they are equaled.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132624333","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 : 2017-06-01DOI: 10.1109/PPC.2017.8291303
J. Taccetti, R. McCrady, C. Rose
Due to their high saturation flux density, amorphous metallic alloys play a key role in linear induction accelerators that require ferromagnetic cores with sufficient volt-seconds to support multiple pulses. As both the shape of the material hysteresis curve and the core losses depend on the magnetization rate, dB/dt, measurements at various rates are necessary in any system model involving these alloys. We present the characterization of two candidate materials, Metglas 2605CO and 2605HB1M, at magnetization rates ranging from 1–6 T/ws. We also compare our results to published data [1].
{"title":"Fast magnetization of amorphous metallic cores","authors":"J. Taccetti, R. McCrady, C. Rose","doi":"10.1109/PPC.2017.8291303","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291303","url":null,"abstract":"Due to their high saturation flux density, amorphous metallic alloys play a key role in linear induction accelerators that require ferromagnetic cores with sufficient volt-seconds to support multiple pulses. As both the shape of the material hysteresis curve and the core losses depend on the magnetization rate, dB/dt, measurements at various rates are necessary in any system model involving these alloys. We present the characterization of two candidate materials, Metglas 2605CO and 2605HB1M, at magnetization rates ranging from 1–6 T/ws. We also compare our results to published data [1].","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"320 1-3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114010908","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 : 2017-06-01DOI: 10.1109/ppc.2017.8291236
B. Fridman, A. Khapugin, V. Martynenko, R. Serebrov
The results of research of heavy pulse current switches built on Light Triggered Thyristors (LTT) and pulsed diodes are presented. Transients in a semi-conductor switch are analyzed at a capacitor discharge in a Pulse Forming Network (PFN), which incorporates an inductor and crowbar diodes. Maximal currents for a semiconductor structure, at which thermo-generation peaks appear on oscillograms of forward voltage drop, have been determined. The switch-on process of LTT has been investigated and the need for application of speed-up R-C circuits for a fast and stable transition of the LTT semiconductor structure to the conducting state has been shown. The current switching into the crowbar diodes and pulse over-voltage generation at a reverse recovery of LTTs has been analyzed, and the snubbers for suppression of these over-voltages have been chosen. The results of testing performed at switching of a pulse current up to 100 kA with a voltage up to 6 kV confirm the validity of the accepted technical solutions.
{"title":"Heavy pulse currents LTT switch unit","authors":"B. Fridman, A. Khapugin, V. Martynenko, R. Serebrov","doi":"10.1109/ppc.2017.8291236","DOIUrl":"https://doi.org/10.1109/ppc.2017.8291236","url":null,"abstract":"The results of research of heavy pulse current switches built on Light Triggered Thyristors (LTT) and pulsed diodes are presented. Transients in a semi-conductor switch are analyzed at a capacitor discharge in a Pulse Forming Network (PFN), which incorporates an inductor and crowbar diodes. Maximal currents for a semiconductor structure, at which thermo-generation peaks appear on oscillograms of forward voltage drop, have been determined. The switch-on process of LTT has been investigated and the need for application of speed-up R-C circuits for a fast and stable transition of the LTT semiconductor structure to the conducting state has been shown. The current switching into the crowbar diodes and pulse over-voltage generation at a reverse recovery of LTTs has been analyzed, and the snubbers for suppression of these over-voltages have been chosen. The results of testing performed at switching of a pulse current up to 100 kA with a voltage up to 6 kV confirm the validity of the accepted technical solutions.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"62 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114130272","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 : 2017-06-01DOI: 10.1109/PPC.2017.8291171
M. Mazarakis, M. Kiefer, J. Leckbee, Del H. Anderson, F. Wilkins, Robert J. Obergon
We have constructed a Component Test Stand (CTS) to test various high voltage components to be utilized in near future pulsed-power devices. In addition to cable and oil feed-through design voltage hold off, different types of high voltage switches will be evaluated. The system contains two switches connected in series separated by ∼60 ns worth of high voltage cable. The configuration is such that triggering the first switch enables the triggering of the second switch. This way we can evaluate the performance of two switches at the same time and study the influence of one switch on the other. A software system similar to LabView is designed and built to operate and collect data in a rep-rated mode. The two switches are immersed in transformer oil tanks and pressurized with dry air. The present paper will mainly present a cable-oil feed-through design evaluation as a function of repetition rate. The rep-rate will be adjusted to not affect the cable voltage hold-off as well as switch performance. The rep-rate is necessary in order to obtain component lifetime results in a reasonably short time. Apparently the transformer oil in a high voltage DC environment behaves much differently than in AC. Its behavior is similar to a weak electrolyte, and space charge effects seriously affect the current through it as well as the field distribution. This consideration is quite important in designing the proper high voltage DC cable-oil feedthroughs.
{"title":"Testing high voltage (200KV) DC cable and feed-through designs in rep-rated modes","authors":"M. Mazarakis, M. Kiefer, J. Leckbee, Del H. Anderson, F. Wilkins, Robert J. Obergon","doi":"10.1109/PPC.2017.8291171","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291171","url":null,"abstract":"We have constructed a Component Test Stand (CTS) to test various high voltage components to be utilized in near future pulsed-power devices. In addition to cable and oil feed-through design voltage hold off, different types of high voltage switches will be evaluated. The system contains two switches connected in series separated by ∼60 ns worth of high voltage cable. The configuration is such that triggering the first switch enables the triggering of the second switch. This way we can evaluate the performance of two switches at the same time and study the influence of one switch on the other. A software system similar to LabView is designed and built to operate and collect data in a rep-rated mode. The two switches are immersed in transformer oil tanks and pressurized with dry air. The present paper will mainly present a cable-oil feed-through design evaluation as a function of repetition rate. The rep-rate will be adjusted to not affect the cable voltage hold-off as well as switch performance. The rep-rate is necessary in order to obtain component lifetime results in a reasonably short time. Apparently the transformer oil in a high voltage DC environment behaves much differently than in AC. Its behavior is similar to a weak electrolyte, and space charge effects seriously affect the current through it as well as the field distribution. This consideration is quite important in designing the proper high voltage DC cable-oil feedthroughs.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114859364","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 : 2017-06-01DOI: 10.1109/PPC.2017.8291234
M. Bizot, B. Cassany, L. Courtois, C. Vermare
In order to be able to propose a dual pulse accelerator for future flash X-rays capabilities, a preliminary design of a high current induction injector has been studied. This design is based on the use of dual pulsed power generators actually available in the lab. Architecture, number of cells needed, dimensions of the conductors and breakdown probabilities in the insulating oil are evaluated with the hypothesis of using large METGLAS magnetic cores similar to those used on the RITS-6 IVA machine. The dynamical behavior of the magnetic material under a two-pulse excitation is analyzed with a non-linear magnetic field diffusion model. Choice of impedance coupling between the generators and the cells is based on the flat top requirement for the output energy of the electron beam. Additionally, results of global PSpice simulations are illustrated.
{"title":"Preliminary pusled power design of an induction injector for radiographic applications","authors":"M. Bizot, B. Cassany, L. Courtois, C. Vermare","doi":"10.1109/PPC.2017.8291234","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291234","url":null,"abstract":"In order to be able to propose a dual pulse accelerator for future flash X-rays capabilities, a preliminary design of a high current induction injector has been studied. This design is based on the use of dual pulsed power generators actually available in the lab. Architecture, number of cells needed, dimensions of the conductors and breakdown probabilities in the insulating oil are evaluated with the hypothesis of using large METGLAS magnetic cores similar to those used on the RITS-6 IVA machine. The dynamical behavior of the magnetic material under a two-pulse excitation is analyzed with a non-linear magnetic field diffusion model. Choice of impedance coupling between the generators and the cells is based on the flat top requirement for the output energy of the electron beam. Additionally, results of global PSpice simulations are illustrated.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115436234","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}
We are developing a 30MJ high power pulsed power supply (PPS) system with 10kV operation voltage for eMl research. The PPS system can be divided into several functional subsystems: pulse forming subsystem, control subsystem, charging subsystem, and measurement subsystem. Matrix type structure and modular architecture are adopted in the design of the PPS. The PPS is assembled in two 40' general purpose containers and a primary energy cabin in order to meet the requirements of field experiments and transportation. The pulse forming subsystem consists of 30 parallel pulse power modules (PPMs). Each module includes three 334kJ pulse forming units (PFUs) in parallel. The control subsystem has a two-level control structure. The primary level control device is a remote master controller and the second level is a pulse power module controller. The charging subsystem is composed of 30 high voltage capacity charging power supplies (CCPSs) and a primary energy unit (PEU). The PEU includes 30 lithium iron phosphate group (LIPG), each LIPG power supplied one CCPS. And the core component of CCPS is a series resonance converter based on IGBT bridges. The measurement subsystem adopts a PXI bus based data collection system and a master-slave network structure with optical fiber synchronous communication. With electrical parameters of the PPS and railgun being assumed, numerical studies of the railgun launch process have been down with Matlab/Simulink platform. Through thermal management simulation, the pulse components cooled by air nature can realized continuous discharging 5 times, each time interval of 6 seconds. It is benefits by the pulsed components development and progress. At present, 2 PFU and 1 CCPS have been built and debugged successfully. The 30MJ PPS is expected to be built soon after and will be used for EML research.
{"title":"Design of a 30MJ capacitor-based pulsed power supply for eml","authors":"Zhenxiao Li, Yazhou Zhang, Jinguo Wu, Yong Jin, Hui Tian, Baoming Li","doi":"10.1109/PPC.2017.8291209","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291209","url":null,"abstract":"We are developing a 30MJ high power pulsed power supply (PPS) system with 10kV operation voltage for eMl research. The PPS system can be divided into several functional subsystems: pulse forming subsystem, control subsystem, charging subsystem, and measurement subsystem. Matrix type structure and modular architecture are adopted in the design of the PPS. The PPS is assembled in two 40' general purpose containers and a primary energy cabin in order to meet the requirements of field experiments and transportation. The pulse forming subsystem consists of 30 parallel pulse power modules (PPMs). Each module includes three 334kJ pulse forming units (PFUs) in parallel. The control subsystem has a two-level control structure. The primary level control device is a remote master controller and the second level is a pulse power module controller. The charging subsystem is composed of 30 high voltage capacity charging power supplies (CCPSs) and a primary energy unit (PEU). The PEU includes 30 lithium iron phosphate group (LIPG), each LIPG power supplied one CCPS. And the core component of CCPS is a series resonance converter based on IGBT bridges. The measurement subsystem adopts a PXI bus based data collection system and a master-slave network structure with optical fiber synchronous communication. With electrical parameters of the PPS and railgun being assumed, numerical studies of the railgun launch process have been down with Matlab/Simulink platform. Through thermal management simulation, the pulse components cooled by air nature can realized continuous discharging 5 times, each time interval of 6 seconds. It is benefits by the pulsed components development and progress. At present, 2 PFU and 1 CCPS have been built and debugged successfully. The 30MJ PPS is expected to be built soon after and will be used for EML research.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122449393","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 : 2017-06-01DOI: 10.1109/PPC.2017.8291226
J. Smith, R. Valizadeh, O. Malyshev
Electron multipactor is a major problem in accelerators, both in accelerating cavities associated with dark current and beam induced e-cloud problems, and in RF distribution systems leading to catastrophic damage or in mild cases performance decrease and phase shifting. Laser treatments have been shown experimentally to reduce the Secondary Electron Yield (SEY). A full understanding of the mechanism is desirable, to allow optimisation of the surface morphology. In this poster, the Particle-in-cell (PIC) framework VSim [1] is used to gain this knowledge.
{"title":"Modelling the mechanism of multipactor suppression through novel laser engineered structures","authors":"J. Smith, R. Valizadeh, O. Malyshev","doi":"10.1109/PPC.2017.8291226","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291226","url":null,"abstract":"Electron multipactor is a major problem in accelerators, both in accelerating cavities associated with dark current and beam induced e-cloud problems, and in RF distribution systems leading to catastrophic damage or in mild cases performance decrease and phase shifting. Laser treatments have been shown experimentally to reduce the Secondary Electron Yield (SEY). A full understanding of the mechanism is desirable, to allow optimisation of the surface morphology. In this poster, the Particle-in-cell (PIC) framework VSim [1] is used to gain this knowledge.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128894130","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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