Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop.最新文献_第8页

An overview of high voltage dielectric material for traveling wave kicker magnet application 高压介质材料在行波踢磁体中的应用综述

Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop. Pub Date : 2002-06-30 DOI: 10.1109/MODSYM.2002.1189567

Wu Zhang, J. Sandberg, J. Tuozzolo, R. Cassel, L. Ducimetière, C. Jensen, M. Barnes, G. Wait, J. Wang

{"title":"An overview of high voltage dielectric material for traveling wave kicker magnet application","authors":"Wu Zhang, J. Sandberg, J. Tuozzolo, R. Cassel, L. Ducimetière, C. Jensen, M. Barnes, G. Wait, J. Wang","doi":"10.1109/MODSYM.2002.1189567","DOIUrl":"https://doi.org/10.1109/MODSYM.2002.1189567","url":null,"abstract":"Pulsed high power fast kickers are being used to change beam trajectories in particle accelerators. The fast rise and fall time of pulse waveform demands a transmission line structure for the kicker deflector design. The ideal design will be parallel metal plates. However, it uses very long straight sections to achieve the required deflection. In accelerators with constrained straight sections, high permeability materials such as ferrite have to be used to gain deflection efficiency. The transmission line kicker magnet is also referred as traveling wave kicker magnet. Its construction is based on distributed L-C cells along the longitudinal direction. The magnetic cells and capacitive cells are interleaved to simulate the characteristic impedance of a transmission line to minimize pulse reflection, and provide adequate frequency bandwidth to transmit the kicker pulse with fast rise and fall time. The magnetic cells are usually made of fertile ceramics, but the capacitive cells have been made with different materials. For traveling wave kickers with higher impedance, the parallel plate vacuum capacitor has been used in CERN and KEK design. Others have used ceramic capacitors, printed circuit boards, and high permittivity ceramics as the capacitive cell. The high dielectric material has the advantage of compactness for low impedance kicker magnet construction. It continues to be very attractive for future kicker magnet applications. The high voltage phenomena associated with high dielectric ceramic materials have been widely reported in many industrial application areas. Their implication in the traveling wave magnet application has to be well understood. In this presentation, the areas requiring further quantitative study will be outlined.","PeriodicalId":339166,"journal":{"name":"Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop.","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114706883","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}

引用次数: 3

Recovery of water switches 水开关回收

Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop. Pub Date : 2002-06-30 DOI: 10.1109/MODSYM.2002.1189517

S. Xiao, S. Katsuki, J. Kolb, S. Kono, M. Moselhy, F.H. Schoenbach

{"title":"Recovery of water switches","authors":"S. Xiao, S. Katsuki, J. Kolb, S. Kono, M. Moselhy, F.H. Schoenbach","doi":"10.1109/MODSYM.2002.1189517","DOIUrl":"https://doi.org/10.1109/MODSYM.2002.1189517","url":null,"abstract":"The recovery of a water switch has been studied by means of Schlieren diagnostics. it was found that a vapor bubble which begins to expand 2 /spl mu/s after the electrical breakdown and decays after 1 ms determines the recovery time of the switch. The recovery time, defined as the time required to reach the full voltage across the gap after a previous switch event, was measured for two different electrode geometries by means of a pulse-probe (double pulse) system. The first pulse generated the water breakdown. The second pulse served as a probe pulse. The degree of recovery was defined as the ratio of the breakdown voltage obtained with the second pulse to that of the first pulse. Full recovery was achieved for a switch in static water with an energy deposition of 0.6 J per cm gap length after 2 ms corresponding to a repetition rate of 500 Hz. This rate could be increased to 1 kHz by flowing the water. An all-water pulse generator consisting of a water switch and a pulse forming network with water as dielectric was built and tested. This pulse generator produced 14 kV, 10 ns pulses into a 15 /spl Omega/ load with a current rise of 4/spl times/10/sup 11/ A/s.","PeriodicalId":339166,"journal":{"name":"Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop.","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116974293","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}

引用次数: 8

Atlas: a new high performance system and the optical-transponder DC probe as applied to bank controls instrumentation-and a little history Atlas:一种新的高性能系统和应用于银行控制仪器的光转发器直流探头-和一点历史

Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop. Pub Date : 2002-06-30 DOI: 10.1109/MODSYM.2002.1189574

M. Thompson, J. Cochrane, R. Reinovsky, P. Sanchez

引用次数: 0

The influence of oxidation on space charge formation and electrical performance in /spl gamma/-irradiated low-density polyethylene 氧化对/spl γ辐照低密度聚乙烯空间电荷形成和电性能的影响

Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop. Pub Date : 2002-06-30 DOI: 10.1109/MODSYM.2002.1189559

G. Chen, H. M. Banford, A. Davies

{"title":"The influence of oxidation on space charge formation and electrical performance in /spl gamma/-irradiated low-density polyethylene","authors":"G. Chen, H. M. Banford, A. Davies","doi":"10.1109/MODSYM.2002.1189559","DOIUrl":"https://doi.org/10.1109/MODSYM.2002.1189559","url":null,"abstract":"The research presented in this paper investigates the role of oxidation in the formation of space charge in gamma-irradiated low-density polyethylene after being electrically stressed under dc voltage. Polyethylene plaques both with and without antioxidant were irradiated up to 500 kGy using a /sup 60/Co gamma source and space charge distributions were measured using the piezoelectric induced pressure wave propagation method. It has been found that a large amount of positive charge evolved adjacent to the cathode in the sample without antioxidant and was clearly associated with oxidation of the surface. The amount of charge formed for a given applied stress increased with the dose absorbed by the material. A model based on charge separation has been proposed to explain the formation of space charge and its profile. On the other hand, space charge in a sample containing antioxidant under the same applied electric stress was negligible even in the sample exposed to 500 kGy. The main process to form space charge is via charge injection rather than charge separation in the sample without antioxidant. Electrical breakdown strengths in these two types of samples were also measured.","PeriodicalId":339166,"journal":{"name":"Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop.","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123029431","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}

引用次数: 0

Contaminated connector and surface atmospheric flashover phenomena: a preliminary investigation 污染连接器和表面大气闪络现象:初步调查

Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop. Pub Date : 2002-06-30 DOI: 10.1109/MODSYM.2002.1189504

J.D. Buneo, J. Zirnheld, K. Burke, W. J. Sarjeant

{"title":"Contaminated connector and surface atmospheric flashover phenomena: a preliminary investigation","authors":"J.D. Buneo, J. Zirnheld, K. Burke, W. J. Sarjeant","doi":"10.1109/MODSYM.2002.1189504","DOIUrl":"https://doi.org/10.1109/MODSYM.2002.1189504","url":null,"abstract":"Contaminated connector and surface flashover has been shown to often catastrophically damage energy systems. A greater general understanding is needed to be able to design modem energy systems around this unique failure process. A flashover is a disruptive discharge through air around or over the surface of insulation produced by the application of voltage wherein the breakdown path becomes sufficiently ionized to maintain an electric arc. Flashover in and on insulators has in the past been shown to start near the interface between insulator, conductor and air (or some other insulating medium) and is known as the triple point. The focus of this initial study is on the adverse effects of flashover on thin polyester and polypropylene films cut to initial lengths and widths of 12\"/spl times/3/4\" respectively, representative of long path flashover in contaminated military and industrial systems. Flashover on the samples was initiated by the application of 2400 V/sub ac/. Preliminary results have shown that the thin polyester film is resistant to flashover formation and sublimates upon the application of the external AC voltage. However, polypropylene film was able to sustain the flashover without sublimating. Upon further investigation, the polypropylene would sustain flashover when scaled down linearly in voltage and length to a minimum of 150 V/sub ac/ and 3/4\" length. These initial studies of AC flashover on rather long contaminated surfaces (resistivity of /spl sim/7 ohms/square) are to be extended to DC behavior as well as assessment of flashover robustness with increasing surface resistivity in order to allow improved connector and interface engineering design algorithms to be developed for future systems.","PeriodicalId":339166,"journal":{"name":"Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop.","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122829824","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}

引用次数: 3

A solid state opening switch and mod anode supply for the advanced light source klystrons 为先进的光源速调管提供固态开路开关和模阳极

Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop. Pub Date : 2002-06-30 DOI: 10.1109/MODSYM.2002.1189512

I. Roth, J. Casey, M. Gaudreau, M. Kempkes, T. Hawkey, J. Mulvaney

引用次数: 1

High-current, large volume glow plasma production using pulse modulator 使用脉冲调制器生产大电流、大体积辉光等离子体

Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop. Pub Date : 2002-06-30 DOI: 10.1109/MODSYM.2002.1189543

K. Takaki, R. Hasegawa, S. Mukaigawa, T. Fujiwara, D. Taguchi

{"title":"High-current, large volume glow plasma production using pulse modulator","authors":"K. Takaki, R. Hasegawa, S. Mukaigawa, T. Fujiwara, D. Taguchi","doi":"10.1109/MODSYM.2002.1189543","DOIUrl":"https://doi.org/10.1109/MODSYM.2002.1189543","url":null,"abstract":"Glow discharge plasma was produced with large current up to 150 A using a pulse modulator or a capacitor discharge in dry air (N/sub 2/:O/sub 2/=8:2) or pure nitrogen gas. Rogowski profile electrodes having 107 mm diameter were set in the discharge chamber. The gap length of the electrodes was changed from 1 mm to 20 mm in various gas pressures 1-20 torr. The voltage-current characteristics of the glow in dry air at pressure of 10 torr was successfully obtained in wide current range from 20 mA to 150 A. The glow voltage was almost constant until the whole surface of the cathode was covered with glow, i.e., until the discharge current became 3.7 A under our experimental condition. The voltage increased with increasing current from 3.7 A. The electron density in positive column of the high-current glow discharge were obtained to be 4.9/spl times/10/sup 11/ cm/sup -3/ from calculation based on swarm data. This value is close to the electron density 3/spl times/10/sup 11/ cm/sup -3/ measured with Langmuir probe. The high-current glow discharge plasma was successfully produced with 35 /spl mu/s duration at 1 kHz repetition rate using a pulse modulator. Temperature rise during 10 /spl mu/s pulse glow discharge was obtained to almost 250 K by spectroscopic measurements.","PeriodicalId":339166,"journal":{"name":"Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop.","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124463304","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}

引用次数: 0

Lifetime considerations of high voltage semiconductor diodes for pulsed power applications 用于脉冲功率应用的高压半导体二极管的寿命考虑

Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop. Pub Date : 2002-06-30 DOI: 10.1109/MODSYM.2002.1189475

W. Hartmann, W. Haas, M. Romheld, N. Grass

{"title":"Lifetime considerations of high voltage semiconductor diodes for pulsed power applications","authors":"W. Hartmann, W. Haas, M. Romheld, N. Grass","doi":"10.1109/MODSYM.2002.1189475","DOIUrl":"https://doi.org/10.1109/MODSYM.2002.1189475","url":null,"abstract":"A novel pulse generator scheme using a fast recovery pseudospark switch and a stack of high-power semiconductor diodes was tested. The prototype pulse generator is able to drive capacitive loads of over 150 nF, at peak voltages of up to 40 kV, pulse duration of 6 to 15 /spl mu/s (FWHM, full width at half maximum), and repetition rates of up to 80 pps. Nominal pulse current is between one and 1.5 kA peak. The main limitation in lifetime is caused by the high peak current load in the semiconductor diodes during flashover in the ESP. Diode current can reach up to 8 kA in some cases. A variety of different types of diodes has been investigated, with different physical constructions, i.e. fast high-power press-pack types as well as smaller type, fast, stud-mount diodes. Although the larger press-pack diodes experienced a considerably longer absolute lifetime in these experiments as expected, the comparison of lifetime versus current/charge density on the chip reveals advantages of the stud-mount design (with the diode chip soldered to the substrate) over the press-pack design. The experimental results are discussed in terms of an optimization strategy to achieve the highest power density at minimum cost and volume.","PeriodicalId":339166,"journal":{"name":"Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121210184","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}

引用次数: 4

Generation of focused shock waves by multi-channel electrical discharges in water 水中多通道放电产生聚焦冲击波

Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop. Pub Date : 2002-06-30 DOI: 10.1109/MODSYM.2002.1189444

P. Šunka, M. Fuciman, V. Babický, M. Člupek, J. Beneš, P. Poučková, J. Souček

{"title":"Generation of focused shock waves by multi-channel electrical discharges in water","authors":"P. Šunka, M. Fuciman, V. Babický, M. Člupek, J. Beneš, P. Poučková, J. Souček","doi":"10.1109/MODSYM.2002.1189444","DOIUrl":"https://doi.org/10.1109/MODSYM.2002.1189444","url":null,"abstract":"A novel method for generation of focused shock waves based on multi-channel partial electrical discharges in water with an increased conductivity has been developed. The multi-channel discharge is formed on a composite anode consisting of a metallic electrode covered by a thin porous ceramic layer. Two versions of the generators have been realized. In the first one a cylindrical pressure wave is created on a cylindrical anode 60 mm in diameter and 100 mm long. At the applied voltage of 30 kV, a large number of short discharge channels distributed almost homogeneously on the anode surface are initiated. Each channel creates a semi-spherical pressure wave, and by superposition of all of the waves a cylindrical pressure wave propagating from the anode is formed. The cylindrical pressure wave is focused by a metallic parabolic reflector (cathode) and near the focus it is transformed to a strong shock wave. In the second version a convergent spherical pressure wave is formed by the same kind of the multi-channel discharge on a composite anode in the form of a part of spherical cavity. The discharge volume with the conductive water solution is separated from the experimental space (distilled water) by an acoustically transparent membrane. When supplying the discharges by 1 /spl mu/F condenser bank charged to 30 kV, the amplitude of the shock wave reached 100 MPa at the focal point for the both generators. The shock waves are sharply focused to a focal area of 3 mm, in diameter transversally (full width at a half maximum) and of 40 mm longitudinally. Interaction of two shock waves generated by two subsequent discharges has been demonstrated. Cellular damage induced by the shock waves was demonstrated on hemolysis of human erythrocytes and on damage of lymphocytes.","PeriodicalId":339166,"journal":{"name":"Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop.","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116754447","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}

引用次数: 3

High power thermal battery development 大功率热电池的开发

Conference Record of the Twenty-Fifth International Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop. Pub Date : 2002-06-30 DOI: 10.1109/MODSYM.2002.1189484

P. Butler, R. Guidotti, L. Moya, F. Reinhardt

引用次数: 2