Pub Date : 2017-06-01DOI: 10.1109/PPC.2017.8291275
H. Sanders, D. Warnow
Insulators that have suffered invisible damage can cause catastrophic system failure. Detection of the fault through visual inspection is not possible. An automated non-destructive test method is preferred. We have developed a system capable of peak pulse voltage of > 50 kV with fast rise time and limited pulse energy coupled with a high speed FPGA processor to analyze the output voltage and current for potential insulator faults. This paper will discuss the design and test results of a high-voltage pulse generator with automated fault detection. This pulse generator has been improved using a new high-voltage solid state switch based on thyristors capable of >100 A/ns and >300 V/ns. Using this switch increased the efficiency by 25% versus an IGBT based switch. This paper will also discuss the design and test results of this new switch.
绝缘体遭受看不见的损坏会导致灾难性的系统故障。无法通过目测检测故障。首选自动无损检测方法。我们开发了一个峰值脉冲电压为50kv，上升时间快，脉冲能量有限的系统，并结合高速FPGA处理器来分析潜在绝缘子故障的输出电压和电流。本文将讨论一种具有故障自动检测功能的高压脉冲发生器的设计和测试结果。该脉冲发生器采用一种新型高压固态开关进行了改进，该开关基于可达100 a /ns和300 V/ns的晶闸管。与基于IGBT的开关相比，使用这种开关的效率提高了25%。本文还将讨论这种新型开关的设计和测试结果。
{"title":"Improved high voltage pulse generator for automated insulator fault detection","authors":"H. Sanders, D. Warnow","doi":"10.1109/PPC.2017.8291275","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291275","url":null,"abstract":"Insulators that have suffered invisible damage can cause catastrophic system failure. Detection of the fault through visual inspection is not possible. An automated non-destructive test method is preferred. We have developed a system capable of peak pulse voltage of > 50 kV with fast rise time and limited pulse energy coupled with a high speed FPGA processor to analyze the output voltage and current for potential insulator faults. This paper will discuss the design and test results of a high-voltage pulse generator with automated fault detection. This pulse generator has been improved using a new high-voltage solid state switch based on thyristors capable of >100 A/ns and >300 V/ns. Using this switch increased the efficiency by 25% versus an IGBT based switch. This paper will also discuss the design and test results of this new switch.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"589 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":"132897369","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.2017.8291215
H. P. Chang, C. Fann, H. H. Chen, S. J. Huang, C. H. Huang, C. Y. Wu, P. Chiu, K. Hu, C. L. Chen, K. Tsai, K. K. Lin, K. Hsu
Observation shows that the electron orbit of the TLS (Taiwan light source) storage ring was greatly disturbed during the top-up injection process, both from BPM readings and beam profile monitor. The distortion duration exceeds the pulse lengths of both injection kickers and septum. One of the speculated possible causes would be due to the eddy current effect induced by the leak field of septum magnet. For clarification purpose, we have constructed a full-sine septum power supply and implemented the field in order to eliminate the said eddy current effect. The study shows that both pulse shape matching among four kickers and septum leakage field play major influence on the causes. This report will present the experimental results.
{"title":"Using a full-sine septum power supply to study the top-up orbit disturbance at Taiwan light source","authors":"H. P. Chang, C. Fann, H. H. Chen, S. J. Huang, C. H. Huang, C. Y. Wu, P. Chiu, K. Hu, C. L. Chen, K. Tsai, K. K. Lin, K. Hsu","doi":"10.1109/PPC.2017.8291215","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291215","url":null,"abstract":"Observation shows that the electron orbit of the TLS (Taiwan light source) storage ring was greatly disturbed during the top-up injection process, both from BPM readings and beam profile monitor. The distortion duration exceeds the pulse lengths of both injection kickers and septum. One of the speculated possible causes would be due to the eddy current effect induced by the leak field of septum magnet. For clarification purpose, we have constructed a full-sine septum power supply and implemented the field in order to eliminate the said eddy current effect. The study shows that both pulse shape matching among four kickers and septum leakage field play major influence on the causes. This report will present the experimental results.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"80 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":"130593333","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.2017.8291302
Y. Torigoe, Douyan Wang, T. Namihira
Ethylene, a gas released from fruits and vegetables, has an effect to hasten ripening. Modern shipping has fruits and vegetables of various types transported together by container ship; however, the amount of ethylene released and the sensitivity of various produce toward ethylene vary. As such, if products with high ethylene release such as apples are mixed with those with high ethylene sensitivity such as persimmons, the latter will ripen excessively. Non-thermal plasmas (NTP) such as dielectric barrier discharges (DBD) and corona discharges have been investigated as a way to decompose ethylene. Nanosecond (ns) pulsed discharge, a type of NTP, is known to generate O3, treat exhaust gases and decompose VOCs with higher energy efficiency. However, many issues still remain prior to industrial implementation, including increasing energy efficiency for the removal of formic acid (HCOOH), CO, and O3 resulting as byproducts; there are also decomposition limitations in areas of low ethylene concentration. Overcoming these limitations is the purpose of this work. The output voltage of our ns pulse generator was 30 kV–50 kV in amplitude, 10 pulse/s–100 pulse/s in repetition rate, and 5 ns in pulse width. 100 ppm ethylene diluted with dried air was employed as gas simulating that of a transportation container. The gas mixture was fed into the coaxial cylinder type reactor for evaluation of decomposition efficiency. Ethylene concentration decreased to less than 0.1 ppm after ns pulsed discharge treatment at 30 J/L in input energy density. O3, CO, NO, HCOOH, HNO3 were generated as byproducts; byproduct concentrations were measured.
{"title":"Ethylene treatment using nanosecond pulsed discharge","authors":"Y. Torigoe, Douyan Wang, T. Namihira","doi":"10.1109/PPC.2017.8291302","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291302","url":null,"abstract":"Ethylene, a gas released from fruits and vegetables, has an effect to hasten ripening. Modern shipping has fruits and vegetables of various types transported together by container ship; however, the amount of ethylene released and the sensitivity of various produce toward ethylene vary. As such, if products with high ethylene release such as apples are mixed with those with high ethylene sensitivity such as persimmons, the latter will ripen excessively. Non-thermal plasmas (NTP) such as dielectric barrier discharges (DBD) and corona discharges have been investigated as a way to decompose ethylene. Nanosecond (ns) pulsed discharge, a type of NTP, is known to generate O3, treat exhaust gases and decompose VOCs with higher energy efficiency. However, many issues still remain prior to industrial implementation, including increasing energy efficiency for the removal of formic acid (HCOOH), CO, and O3 resulting as byproducts; there are also decomposition limitations in areas of low ethylene concentration. Overcoming these limitations is the purpose of this work. The output voltage of our ns pulse generator was 30 kV–50 kV in amplitude, 10 pulse/s–100 pulse/s in repetition rate, and 5 ns in pulse width. 100 ppm ethylene diluted with dried air was employed as gas simulating that of a transportation container. The gas mixture was fed into the coaxial cylinder type reactor for evaluation of decomposition efficiency. Ethylene concentration decreased to less than 0.1 ppm after ns pulsed discharge treatment at 30 J/L in input energy density. O3, CO, NO, HCOOH, HNO3 were generated as byproducts; byproduct concentrations were measured.","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":"133151528","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.2017.8291321
O. Egorov
The skin-effect opening switch (SEOS) with joint combinations a semi-conductor opening switches (SOS) or else plasma opening switch (POS) is one of possible technical solution that lets to use transformer inductive storage (TIS) in pulse power technique. This combination has several attractive properties: durable functioning of each components and a good ratio of (ts) storage time of (tout) — energy output to the load one ts/tout ~107÷108 under high pulsed power level. A high relation ts/tout lets effectively output energy to a load from TIS both single pulse and pulse train generation. Absolute stability of the SEOS with joint combinations both SOS and POS can be applied them for parallel operation.
{"title":"Pulsed power generator based on inductive storage and skin-effect opening switch (Energy correlation and technical application)","authors":"O. Egorov","doi":"10.1109/PPC.2017.8291321","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291321","url":null,"abstract":"The skin-effect opening switch (SEOS) with joint combinations a semi-conductor opening switches (SOS) or else plasma opening switch (POS) is one of possible technical solution that lets to use transformer inductive storage (TIS) in pulse power technique. This combination has several attractive properties: durable functioning of each components and a good ratio of (ts) storage time of (tout) — energy output to the load one ts/tout ~107÷108 under high pulsed power level. A high relation ts/tout lets effectively output energy to a load from TIS both single pulse and pulse train generation. Absolute stability of the SEOS with joint combinations both SOS and POS can be applied them for parallel operation.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"28 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":"126982229","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.2017.8291182
R. Curry, S. Dickerson, A. Howard, B. Lamb, S. Mounter
A high dielectric, nanodielectric, composite material, MU100, was developed by the University of Missouri for use in dielectric loaded antennas. Based on its dielectric strength and losses, MU100 had possible uses in the development of high energy-density capacitors. This paper presents the dielectric properties of the materials for high energy-density pulsed power applications. Additionally, the application of compact high voltage capacitors and recent advances demonstrated during the testing and evaluation of this material is explored. Small scale tests have shown the average dielectric strength of MU100 to be 225 kV/cm with a peak break down field of 328 kV/cm. When potted, these small-scale capacitors have lifetimes in excess of 800,000 discharges at 80% of their maximum rated field strength.
{"title":"Scaled DC lifetime, test and evaluation of advanced nanocomposite materials for compact high voltage capacitors","authors":"R. Curry, S. Dickerson, A. Howard, B. Lamb, S. Mounter","doi":"10.1109/PPC.2017.8291182","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291182","url":null,"abstract":"A high dielectric, nanodielectric, composite material, MU100, was developed by the University of Missouri for use in dielectric loaded antennas. Based on its dielectric strength and losses, MU100 had possible uses in the development of high energy-density capacitors. This paper presents the dielectric properties of the materials for high energy-density pulsed power applications. Additionally, the application of compact high voltage capacitors and recent advances demonstrated during the testing and evaluation of this material is explored. Small scale tests have shown the average dielectric strength of MU100 to be 225 kV/cm with a peak break down field of 328 kV/cm. When potted, these small-scale capacitors have lifetimes in excess of 800,000 discharges at 80% of their maximum rated field strength.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"84 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":"116660262","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.2017.8291295
K. Shibata, S. Konno, K. Takahashi, S. Mukaigawa, K. Takaki, K. Yukimura
Plasma source of an inductively coupled plasma (ICP) driven by high voltage burst pulse has been developed. A 200 ps wide burst of 157 kHz power supply was used to produce plasma with repetition rate of 1 Hz. The electrical and plasma parameters are obtained based on mutual induction circuit model by analyzing waveforms of the coil current and the voltage. The plasma density was also obtained using a double probe measurement. The results showed that electrical power into plasma was obtained as 13.1 kW. The plasma density was obtained to be 1019 m−3 order by the equivalent circuit, which is good agreement with that obtained with probe measurement.
{"title":"Electrical and plasma characteristics of 150 kHz band high-power burst inductively coupled plasma","authors":"K. Shibata, S. Konno, K. Takahashi, S. Mukaigawa, K. Takaki, K. Yukimura","doi":"10.1109/PPC.2017.8291295","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291295","url":null,"abstract":"Plasma source of an inductively coupled plasma (ICP) driven by high voltage burst pulse has been developed. A 200 ps wide burst of 157 kHz power supply was used to produce plasma with repetition rate of 1 Hz. The electrical and plasma parameters are obtained based on mutual induction circuit model by analyzing waveforms of the coil current and the voltage. The plasma density was also obtained using a double probe measurement. The results showed that electrical power into plasma was obtained as 13.1 kW. The plasma density was obtained to be 1019 m−3 order by the equivalent circuit, which is good agreement with that obtained with probe measurement.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"104 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":"124661279","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.2017.8291282
A. Zhukeshov, B. M. Ibraev, A. Amrenova, A. Gabdullina, Z. Moldabekov, K. Serik
Today, the efforts of scientists to solve problems of fusion associated mainly with magnetic systems, primarily with tokamaks and etc. One of alternative method is a plasma focus (PF) installations, based on the focusing of the plasma beam in a small area with high density. There are same works published last time in which considered this problem, but it wasn't many. We mention the works [1] and [2], where attempts have been made to obtain fusion processes in PF devices. As shoved Niculin [3], increasing of discharge current of PF more than 2 MA haven't been to proportionality increase of plasma density. There is known, that in coaxial guns appear a Hall Effect, which decreased a plasma velocity [4]. If we exclude this phenomenon from plasma, there is possible to increase the energy of plasma particles. But the ways of plasma description, based on average energy 3kT/2 is not suitable for PF devices, as well as Lawson criteria. For these devices the target theory is more applicable. So, we are apology, that not only power, but geometry of experiment play important role. On this way, we have made experiments on basic of pulsed plasma accelerator CPA-30 with short and long electrodes. The experiments showed a significant dependence of the flux focusing parameters on the electrode geometry. Analysis of experiments and calculations show, that the efficiency of plasma compression became much higher with a short electrode. However, as the length of the electrode decreases, no increase in the plasma temperature is observed. The reason for this is the too long discharge time, so the accelerated particles in the plasma can be thermal. To start the synthesis and emission of X-rays from the focus region, calculations show that discharge times on the order of picoseconds are necessary.
{"title":"The pulsed plasma accelerator with focusing electrodes experiments","authors":"A. Zhukeshov, B. M. Ibraev, A. Amrenova, A. Gabdullina, Z. Moldabekov, K. Serik","doi":"10.1109/ppc.2017.8291282","DOIUrl":"https://doi.org/10.1109/ppc.2017.8291282","url":null,"abstract":"Today, the efforts of scientists to solve problems of fusion associated mainly with magnetic systems, primarily with tokamaks and etc. One of alternative method is a plasma focus (PF) installations, based on the focusing of the plasma beam in a small area with high density. There are same works published last time in which considered this problem, but it wasn't many. We mention the works [1] and [2], where attempts have been made to obtain fusion processes in PF devices. As shoved Niculin [3], increasing of discharge current of PF more than 2 MA haven't been to proportionality increase of plasma density. There is known, that in coaxial guns appear a Hall Effect, which decreased a plasma velocity [4]. If we exclude this phenomenon from plasma, there is possible to increase the energy of plasma particles. But the ways of plasma description, based on average energy 3kT/2 is not suitable for PF devices, as well as Lawson criteria. For these devices the target theory is more applicable. So, we are apology, that not only power, but geometry of experiment play important role. On this way, we have made experiments on basic of pulsed plasma accelerator CPA-30 with short and long electrodes. The experiments showed a significant dependence of the flux focusing parameters on the electrode geometry. Analysis of experiments and calculations show, that the efficiency of plasma compression became much higher with a short electrode. However, as the length of the electrode decreases, no increase in the plasma temperature is observed. The reason for this is the too long discharge time, so the accelerated particles in the plasma can be thermal. To start the synthesis and emission of X-rays from the focus region, calculations show that discharge times on the order of picoseconds are necessary.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"39 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":"125122320","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.2017.8291218
B. Pushpakaran, S. Bayne, A. Ogunniyi
Key requirements for a solid state switch in a fast switching pulsed power circuit include high blocking voltage, high current conduction and fast switching capability. Typical pulsed power applications like plasma initiation and high-energy LASER require operating voltages in the order of several kilovolts. The development of a multi-kilovolt SiC MOSFET for fast switching pulsed power application would require detailed analysis of the device switching characteristics. Since the switching speed of a MOSFET is primarily dependent on the inter-electrode capacitances, it becomes critical to have a comprehensive understanding of the device capacitance and its effect on the gate driver requirements for narrow-pulse switching. In this research, 2D model of a 10 kV 4H-SiC MOSFET was developed using Silvaco ATLAS TCAD software and simulated for its steady state, AC, and transient characteristics. The device cell was designed for an active area of 5 μm2 and 100 A/cm2 drain current density. The capacitance-voltage and gate charge curve for the SiC MOSFET were obtained via AC and transient simulation respectively. This data was used to estimate the gate drive requirements for the device under fast switching conditions.
{"title":"Silvaco-based evaluation of 10 kV 4H-SiC MOSFET as a solidstate switch in narrow-pulse application","authors":"B. Pushpakaran, S. Bayne, A. Ogunniyi","doi":"10.1109/PPC.2017.8291218","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291218","url":null,"abstract":"Key requirements for a solid state switch in a fast switching pulsed power circuit include high blocking voltage, high current conduction and fast switching capability. Typical pulsed power applications like plasma initiation and high-energy LASER require operating voltages in the order of several kilovolts. The development of a multi-kilovolt SiC MOSFET for fast switching pulsed power application would require detailed analysis of the device switching characteristics. Since the switching speed of a MOSFET is primarily dependent on the inter-electrode capacitances, it becomes critical to have a comprehensive understanding of the device capacitance and its effect on the gate driver requirements for narrow-pulse switching. In this research, 2D model of a 10 kV 4H-SiC MOSFET was developed using Silvaco ATLAS TCAD software and simulated for its steady state, AC, and transient characteristics. The device cell was designed for an active area of 5 μm2 and 100 A/cm2 drain current density. The capacitance-voltage and gate charge curve for the SiC MOSFET were obtained via AC and transient simulation respectively. This data was used to estimate the gate drive requirements for the device under fast switching conditions.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"1 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":"128884643","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.2017.8291307
A. Phipps, A. MacLachlan, Liang Zhang, C. Robertson, I. Konoplev, K. Ronald, A. Phelps, A. Cross
A Two-dimensional (2D) Periodic Surface Lattice (PSL) can produce distributed feedback in high power microwave sources driven by an oversized electron beam of annular geometry. Such 2D periodic structures can be formed in cylindrical waveguide with a grating machined on the walls, where the diameter of the waveguide is larger than the wavelength λ (D >> λ). In this case localised surface fields can be excited around the perturbations if the structure is radiated by an external source (for example an electron beam). Experiments were conducted using a velvet cathode electron gun with the electron accelerating voltage produced by a cable Blumlein generator. “Additive Manufacturing” or “3D printing” was used to construct a silver 2D PSL quickly, efficiently and relatively inexpensively. The electron beam formed within an 18 mm bore 1.8 T solenoid was transported through the 7.2 mm inner diameter silver 2D PSL beam-wave interaction region. An 80 kV, 100 A electron beam with an outer diameter of 4 mm and inner diameter of 2mm which was approximately 1.8 mm away from the inner surface of the 2D PSL corrugation was measured. Millimetre wave radiation at a frequency of ~80GHz at an output power of 130 ± 30 kW corresponding to an operating efficiency of ~1.7 % was measured.
{"title":"Periodic structures manufactured by 3D printing for electron beam excitation of high power microwave sources","authors":"A. Phipps, A. MacLachlan, Liang Zhang, C. Robertson, I. Konoplev, K. Ronald, A. Phelps, A. Cross","doi":"10.1109/PPC.2017.8291307","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291307","url":null,"abstract":"A Two-dimensional (2D) Periodic Surface Lattice (PSL) can produce distributed feedback in high power microwave sources driven by an oversized electron beam of annular geometry. Such 2D periodic structures can be formed in cylindrical waveguide with a grating machined on the walls, where the diameter of the waveguide is larger than the wavelength λ (D >> λ). In this case localised surface fields can be excited around the perturbations if the structure is radiated by an external source (for example an electron beam). Experiments were conducted using a velvet cathode electron gun with the electron accelerating voltage produced by a cable Blumlein generator. “Additive Manufacturing” or “3D printing” was used to construct a silver 2D PSL quickly, efficiently and relatively inexpensively. The electron beam formed within an 18 mm bore 1.8 T solenoid was transported through the 7.2 mm inner diameter silver 2D PSL beam-wave interaction region. An 80 kV, 100 A electron beam with an outer diameter of 4 mm and inner diameter of 2mm which was approximately 1.8 mm away from the inner surface of the 2D PSL corrugation was measured. Millimetre wave radiation at a frequency of ~80GHz at an output power of 130 ± 30 kW corresponding to an operating efficiency of ~1.7 % was measured.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"40 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":"129761988","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.2017.8291245
Linghe Zhou, Tao Wang, S. Macgregor, Mark P. Wilson, I. Timoshkin, M. Given
An experimental study on NO removal was undertaken using cylindrical dielectric barrier discharge (DBD). The aim is to investigate reaction pathway and the role of reactive species such as O, O3 and OH for NO removal. Under different concentration of O2, H2O and NO, the dominant reactive species was investigated quantitatively. In addition, according to the feed gas compositions, the magnitude of filamentary discharge current would change from a few mA to more than one hundred mA.
{"title":"NO removal and discharge characteristics using dielectric barrier discharge","authors":"Linghe Zhou, Tao Wang, S. Macgregor, Mark P. Wilson, I. Timoshkin, M. Given","doi":"10.1109/PPC.2017.8291245","DOIUrl":"https://doi.org/10.1109/PPC.2017.8291245","url":null,"abstract":"An experimental study on NO removal was undertaken using cylindrical dielectric barrier discharge (DBD). The aim is to investigate reaction pathway and the role of reactive species such as O, O3 and OH for NO removal. Under different concentration of O2, H2O and NO, the dominant reactive species was investigated quantitatively. In addition, according to the feed gas compositions, the magnitude of filamentary discharge current would change from a few mA to more than one hundred mA.","PeriodicalId":247019,"journal":{"name":"2017 IEEE 21st International Conference on Pulsed Power (PPC)","volume":"59 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":"126428702","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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