N. Bykov, V. Gubanov, A. Gunin, S. Korovin, O. Kutenkov, V. F. Landl, S. Polevin, V. Rostov, G. Mesyats, F. Zagulov
The paper presents the results of an experimental study of the cold cathodes used in the Sinus-type repetitive high-current accelerators. The accelerating voltage for this accelerator is on a level of 100-1000 keV, the electron beam current is 1-10 kA, the pulse duration is 10-40 ns, and the pulse repetition rate is up to 200 pps. The emissive properties of the cathodes were investigated for both planar and coaxial magnetically insulated vacuum diodes. To produce high-current electron beams in coaxial diodes, a strong magnetic field of strength up to 30 kOe created by a superconducting solenoid was used. Investigated in the experiment were explosive-emission cold cathodes of varied geometry made of various materials such as copper, steel, stainless steel, bronze, graphite, and carbon-graphite cloth as well as metal-dielectric cathodes depending for their operation on an incomplete electrical discharge over the dielectric surface. The longest lifetime has been attained for a metal-dielectric cathode in a planar vacuum diode; it is over 10/sup 8/ shots. The cathode provided the current density at the anode 20-25 A/cm/sup 2/ for the accelerating voltage 600 kV, pulse duration 20 ns, and pulse repetition rate up to 200 pps.
{"title":"Development of long-lifetime cold cathodes","authors":"N. Bykov, V. Gubanov, A. Gunin, S. Korovin, O. Kutenkov, V. F. Landl, S. Polevin, V. Rostov, G. Mesyats, F. Zagulov","doi":"10.1109/PPC.1995.596457","DOIUrl":"https://doi.org/10.1109/PPC.1995.596457","url":null,"abstract":"The paper presents the results of an experimental study of the cold cathodes used in the Sinus-type repetitive high-current accelerators. The accelerating voltage for this accelerator is on a level of 100-1000 keV, the electron beam current is 1-10 kA, the pulse duration is 10-40 ns, and the pulse repetition rate is up to 200 pps. The emissive properties of the cathodes were investigated for both planar and coaxial magnetically insulated vacuum diodes. To produce high-current electron beams in coaxial diodes, a strong magnetic field of strength up to 30 kOe created by a superconducting solenoid was used. Investigated in the experiment were explosive-emission cold cathodes of varied geometry made of various materials such as copper, steel, stainless steel, bronze, graphite, and carbon-graphite cloth as well as metal-dielectric cathodes depending for their operation on an incomplete electrical discharge over the dielectric surface. The longest lifetime has been attained for a metal-dielectric cathode in a planar vacuum diode; it is over 10/sup 8/ shots. The cathode provided the current density at the anode 20-25 A/cm/sup 2/ for the accelerating voltage 600 kV, pulse duration 20 ns, and pulse repetition rate up to 200 pps.","PeriodicalId":11163,"journal":{"name":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82066369","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}
A high temperature superconducting switch with external magnetic field switching was utilized to switch a thermoelectric source. The superconducting switch was constructed of filaments of yttrium-barium-copper oxide (YBCO) ceramic and switched with an externally applied magnetic field. The superconducting switch is being used as an opening switch for a thermoelectric current source. The thermoelectric source, based on Seebeck is capable of high current, low voltage generation. It consists of a series of hot and cold junctions, arranged in series to increase the voltage of the system. Source output is a function of temperature differential between cold and hot junctions. The superconducting switch operates at liquid nitrogen temperature. Therefore, liquid cryogen is available to the cold junctions of the current source, and, with sufficient heat applied to the hot junctions, a significant temperature differential, far greater than that obtained using conventional cooling, is available, thus increasing the overall efficiency of the system. The device sees application wherever a fast acting, lossless switch or current limiter is required, with a compact, simple power source, neither of which have any moving parts to fail or wear.
{"title":"High temperature superconducting opening pulser switch with compact thermoelectric source","authors":"T. Podlesak, H. Singh, R. Feltz, J. Creedon","doi":"10.1109/PPC.1995.599772","DOIUrl":"https://doi.org/10.1109/PPC.1995.599772","url":null,"abstract":"A high temperature superconducting switch with external magnetic field switching was utilized to switch a thermoelectric source. The superconducting switch was constructed of filaments of yttrium-barium-copper oxide (YBCO) ceramic and switched with an externally applied magnetic field. The superconducting switch is being used as an opening switch for a thermoelectric current source. The thermoelectric source, based on Seebeck is capable of high current, low voltage generation. It consists of a series of hot and cold junctions, arranged in series to increase the voltage of the system. Source output is a function of temperature differential between cold and hot junctions. The superconducting switch operates at liquid nitrogen temperature. Therefore, liquid cryogen is available to the cold junctions of the current source, and, with sufficient heat applied to the hot junctions, a significant temperature differential, far greater than that obtained using conventional cooling, is available, thus increasing the overall efficiency of the system. The device sees application wherever a fast acting, lossless switch or current limiter is required, with a compact, simple power source, neither of which have any moving parts to fail or wear.","PeriodicalId":11163,"journal":{"name":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76221420","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}
H. Akiyama, K. Kawamura, T. Takeshita, S. Katsuki, S. Maeda, S. Tsukamoto, M. Murata
Pollution control is one of important subjects in the world. Such pollution control by pulsed power is a promising method for the removal of NO/sub x/ and SO/sub 2/. Experimental results of NO/sub x/ removal by a repetitive pulsed power generator using an inductive energy storage system are described. The removal ratio of NO gas was measured by a gas analyzer and a laser-induced fluorescence (LIF) method. The NO gas, mixed with N/sub 2/ gas was removed up to about 100%, and the dependence of the removal ratio of NO gas on the shot number of pulsed power is in good agreement with results of computer simulation.
{"title":"Removal of NO/sub x/ using discharges by pulsed power","authors":"H. Akiyama, K. Kawamura, T. Takeshita, S. Katsuki, S. Maeda, S. Tsukamoto, M. Murata","doi":"10.1109/PPC.1995.596469","DOIUrl":"https://doi.org/10.1109/PPC.1995.596469","url":null,"abstract":"Pollution control is one of important subjects in the world. Such pollution control by pulsed power is a promising method for the removal of NO/sub x/ and SO/sub 2/. Experimental results of NO/sub x/ removal by a repetitive pulsed power generator using an inductive energy storage system are described. The removal ratio of NO gas was measured by a gas analyzer and a laser-induced fluorescence (LIF) method. The NO gas, mixed with N/sub 2/ gas was removed up to about 100%, and the dependence of the removal ratio of NO gas on the shot number of pulsed power is in good agreement with results of computer simulation.","PeriodicalId":11163,"journal":{"name":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87917296","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}
Xie Ming, Deng Jianjun, Zang Enguan, Ding Bainan, Shi Jinshui, He Yi
Basic research for repetition of blowing gas field distortion spark switch is described in this paper. The switch designed by ourselves can work repetitively, the maximum repetition rate is up to 130 Hz during 80 ns, and the maximum working voltage is up to 60 kV; and delay time is less than 100 ns, jitter is less than 10 ns; the variation of the switch's peak voltage is no more than 1%.
{"title":"Basic research for repetition rate of blowing gas field distortion spark switch","authors":"Xie Ming, Deng Jianjun, Zang Enguan, Ding Bainan, Shi Jinshui, He Yi","doi":"10.1109/PPC.1995.596820","DOIUrl":"https://doi.org/10.1109/PPC.1995.596820","url":null,"abstract":"Basic research for repetition of blowing gas field distortion spark switch is described in this paper. The switch designed by ourselves can work repetitively, the maximum repetition rate is up to 130 Hz during 80 ns, and the maximum working voltage is up to 60 kV; and delay time is less than 100 ns, jitter is less than 10 ns; the variation of the switch's peak voltage is no more than 1%.","PeriodicalId":11163,"journal":{"name":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88110177","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 authors have designed a multi-pulse laser system to measure nanosecond timescale, plasma-density gradients by moire/spl acute/ deflectometry. The complete system consists of four, transverse-excited, atmospheric pressure (TEA) N/sub 2/ laser oscillators and two low-pressure N/sub 2/ laser amplifiers; two oscillator pulses are injected into a single amplifier. The amplified pulses are less than a nanosecond in duration, with a variable, inter-pulse time of 4-10 nanoseconds. Described here, two TEA oscillators and a single amplifier were used to image air-density gradients in an expanding air-shock wave produced by a spark discharge.
{"title":"Moire deflectometry diagnostic for transient plasma using a multi-pulse N/sub 2/ laser","authors":"B. Moosman, V. Bystritskii, F. Wessel","doi":"10.1109/PPC.1995.599727","DOIUrl":"https://doi.org/10.1109/PPC.1995.599727","url":null,"abstract":"The authors have designed a multi-pulse laser system to measure nanosecond timescale, plasma-density gradients by moire/spl acute/ deflectometry. The complete system consists of four, transverse-excited, atmospheric pressure (TEA) N/sub 2/ laser oscillators and two low-pressure N/sub 2/ laser amplifiers; two oscillator pulses are injected into a single amplifier. The amplified pulses are less than a nanosecond in duration, with a variable, inter-pulse time of 4-10 nanoseconds. Described here, two TEA oscillators and a single amplifier were used to image air-density gradients in an expanding air-shock wave produced by a spark discharge.","PeriodicalId":11163,"journal":{"name":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88120216","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. L. Barthell, W. Anderson, V. Gomez, B. Henneke, J.E. Moore, G. A. Reeves, M. Salazar, J. Townsend
Fabrication of cylindrical aluminum load foils and graded thickness aluminum vacuum opening switch foils is described. Load foils are vaporized by Joule heating and imploded by J/spl times/B forces to stagnate on axis and create soft X-rays. Plasma flow switch foils are mounted to shunt the vacuum power flow channel of a coaxial gun and are vaporized by Joule heating. The resultant graded density plasma is magnetically driven down the annular power flow channel. Opening switch action occurs when the shunt plasma crosses a load slot in the center conductor. These foil components have been used in both the Pegasus and Procyon experiments.
{"title":"Physical vapor deposited aluminum foils for high energy density physics experiments","authors":"B. L. Barthell, W. Anderson, V. Gomez, B. Henneke, J.E. Moore, G. A. Reeves, M. Salazar, J. Townsend","doi":"10.1109/PPC.1995.599743","DOIUrl":"https://doi.org/10.1109/PPC.1995.599743","url":null,"abstract":"Fabrication of cylindrical aluminum load foils and graded thickness aluminum vacuum opening switch foils is described. Load foils are vaporized by Joule heating and imploded by J/spl times/B forces to stagnate on axis and create soft X-rays. Plasma flow switch foils are mounted to shunt the vacuum power flow channel of a coaxial gun and are vaporized by Joule heating. The resultant graded density plasma is magnetically driven down the annular power flow channel. Opening switch action occurs when the shunt plasma crosses a load slot in the center conductor. These foil components have been used in both the Pegasus and Procyon experiments.","PeriodicalId":11163,"journal":{"name":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88240551","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}
This paper describes the electrostatic modelling procedures which were undertaken in the design and evaluation of a long lifetime, low jitter, high voltage trigatron spark gap. The parameters studied were the trigger pin diameter, the proximity of this pin to the adjacent earthed electrode, the earthed electrode profile, the high voltage electrode profile and the position of the trigger pin. By employing electrostatic field modelling techniques, the level of field distortion present in the trigatron has been evaluated as a function of the trigger pin dimensions and position. This has allowed the operating lifetime of the spark gap to be predicted by considering the range of trigger pin positions which would result in an acceptable level of field enhancement. Electrostatic profiling of the adjacent conductors and insulators has also been carried out, resulting in an overall switch design with optimised performance and minimal volume. The above procedure has led to the production and testing of a 500 kV triggered switch which has been operated successfully with a sub-nanosecond jitter and relatively long lifetime.
{"title":"Electrostatic modelling of a trigatron spark gap","authors":"A. Macphee, S. Macgregor, S. Turnbull","doi":"10.1109/PPC.1995.599706","DOIUrl":"https://doi.org/10.1109/PPC.1995.599706","url":null,"abstract":"This paper describes the electrostatic modelling procedures which were undertaken in the design and evaluation of a long lifetime, low jitter, high voltage trigatron spark gap. The parameters studied were the trigger pin diameter, the proximity of this pin to the adjacent earthed electrode, the earthed electrode profile, the high voltage electrode profile and the position of the trigger pin. By employing electrostatic field modelling techniques, the level of field distortion present in the trigatron has been evaluated as a function of the trigger pin dimensions and position. This has allowed the operating lifetime of the spark gap to be predicted by considering the range of trigger pin positions which would result in an acceptable level of field enhancement. Electrostatic profiling of the adjacent conductors and insulators has also been carried out, resulting in an overall switch design with optimised performance and minimal volume. The above procedure has led to the production and testing of a 500 kV triggered switch which has been operated successfully with a sub-nanosecond jitter and relatively long lifetime.","PeriodicalId":11163,"journal":{"name":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86110321","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. Kirkpatrick, R. S. Thurston, R. Chrein, J. Guzik, A. Sgro, D. Scudder, F. Wysocki, J. Fernández, J. Shlachter, I. Lindemuth, P. Sheehey
Magnetized target fusion (MTF), in which a magnetothermally insulated plasma is hydrodynamically compressed to fusion conditions, represents an approach to controlled fusion which avoids difficulties of both traditional inertial confinement and magnetic confinement approaches. It appears possible to compress a magnetothermally insulated plasma to fusion ignition conditions using existing, relatively inexpensive drivers, such as pulsed power devices (including explosive pulsed power). Hence, MTF may represent a means to demonstrate and study ignited plasmas with a very small capital investment. An ongoing LANL explosive pulsed power collaboration with the Russian VNIIEF Laboratory at Arzamas 16 is partly motivated by this application. We are proposing to demonstrate the feasibility of magnetized target fusion by: (1) creating a suitable magnetized target plasma, and (2) performing preliminary liner compression experiments using existing pulsed power facilities and demonstrated liner performance. The required plasma conditions vary for different drivers, but are approximately described by temperature >50 eV, density >10/sup -6/ gm/cm/sup 3/, current of several hundred kiloamperes, and dimensions of one to a few cm (giving an embedded magnetic field of about 50 kG). The initial candidate for creating the target plasma is a fiber-initiated Z-pinch. These pinches have already been created with relevant parameters, but need to be optimized for the MTF application. The target plasma would be diagnosed and optimized inside a static liner, using interferometry, spectroscopy, and other diagnostic tools.
{"title":"Proposed generation and compression of a target plasma for MTF","authors":"R. Kirkpatrick, R. S. Thurston, R. Chrein, J. Guzik, A. Sgro, D. Scudder, F. Wysocki, J. Fernández, J. Shlachter, I. Lindemuth, P. Sheehey","doi":"10.1109/PPC.1995.599751","DOIUrl":"https://doi.org/10.1109/PPC.1995.599751","url":null,"abstract":"Magnetized target fusion (MTF), in which a magnetothermally insulated plasma is hydrodynamically compressed to fusion conditions, represents an approach to controlled fusion which avoids difficulties of both traditional inertial confinement and magnetic confinement approaches. It appears possible to compress a magnetothermally insulated plasma to fusion ignition conditions using existing, relatively inexpensive drivers, such as pulsed power devices (including explosive pulsed power). Hence, MTF may represent a means to demonstrate and study ignited plasmas with a very small capital investment. An ongoing LANL explosive pulsed power collaboration with the Russian VNIIEF Laboratory at Arzamas 16 is partly motivated by this application. We are proposing to demonstrate the feasibility of magnetized target fusion by: (1) creating a suitable magnetized target plasma, and (2) performing preliminary liner compression experiments using existing pulsed power facilities and demonstrated liner performance. The required plasma conditions vary for different drivers, but are approximately described by temperature >50 eV, density >10/sup -6/ gm/cm/sup 3/, current of several hundred kiloamperes, and dimensions of one to a few cm (giving an embedded magnetic field of about 50 kG). The initial candidate for creating the target plasma is a fiber-initiated Z-pinch. These pinches have already been created with relevant parameters, but need to be optimized for the MTF application. The target plasma would be diagnosed and optimized inside a static liner, using interferometry, spectroscopy, and other diagnostic tools.","PeriodicalId":11163,"journal":{"name":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89086781","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}
Z. Zabar, E. Levi, L. Birenbaum, P. Vottis, M. Cipollo, E. Kathe
The paper deals with the design and operation of an experimental set up consisting of a 6 cm bore gas cannon using standard propellant and a traveling-wave induction accelerator. The projectile consisting of an aluminum cylinder weighing 120 grams, is initially brought up to a speed of 600 m/s in the gas cannon. The pulsed-power stage is designed to accelerate the projectile further to a velocity of 700 m/s.
{"title":"Pulsed power to the aid of chemical guns","authors":"Z. Zabar, E. Levi, L. Birenbaum, P. Vottis, M. Cipollo, E. Kathe","doi":"10.1109/PPC.1995.596475","DOIUrl":"https://doi.org/10.1109/PPC.1995.596475","url":null,"abstract":"The paper deals with the design and operation of an experimental set up consisting of a 6 cm bore gas cannon using standard propellant and a traveling-wave induction accelerator. The projectile consisting of an aluminum cylinder weighing 120 grams, is initially brought up to a speed of 600 m/s in the gas cannon. The pulsed-power stage is designed to accelerate the projectile further to a velocity of 700 m/s.","PeriodicalId":11163,"journal":{"name":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88927083","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 processes of persistent photoconductivity followed by photo-quenching have been demonstrated at megawatt power levels in copper-compensated, silicon-doped, semi-insulating gallium arsenide. These processes allow a switch to be developed that can be closed by the application of one laser pulse (/spl lambda/=1.06 /spl mu/m) and opened by the application of a second laser pulse with a wavelength equal to twice that of the first laser (/spl lambda/=2.13 /spl mu/m). The opening phase requires a sufficient concentration of recombination centers (RC) in the material for opening to occur in the subnanosecond regime. These RCs are generated in the bulk GaAs material by fast-neutron irradiation (/spl sim/1-MeV). Neutron-irradiated bistable optically controlled semiconductor switch (BOSS) devices have been opened against a rising average electric field of about 36 kV/cm (18 kV) in a time less than one nanosecond while operating at a repetition rate, within a two-pulse burst, of about 1 GHz. The ability to modify the frequency content of the electrical pulses, by varying the time separation, is demonstrated. Results demonstrating the operation of BOSS devices in a frequency-agile RF source configuration are also discussed.
{"title":"Demonstration of a frequency-agile RF source configuration using bistable optically controlled semiconductor switches (BOSS)","authors":"D. Stoudt, M. A. Richardson, S. Moran","doi":"10.1109/PPC.1995.596506","DOIUrl":"https://doi.org/10.1109/PPC.1995.596506","url":null,"abstract":"The processes of persistent photoconductivity followed by photo-quenching have been demonstrated at megawatt power levels in copper-compensated, silicon-doped, semi-insulating gallium arsenide. These processes allow a switch to be developed that can be closed by the application of one laser pulse (/spl lambda/=1.06 /spl mu/m) and opened by the application of a second laser pulse with a wavelength equal to twice that of the first laser (/spl lambda/=2.13 /spl mu/m). The opening phase requires a sufficient concentration of recombination centers (RC) in the material for opening to occur in the subnanosecond regime. These RCs are generated in the bulk GaAs material by fast-neutron irradiation (/spl sim/1-MeV). Neutron-irradiated bistable optically controlled semiconductor switch (BOSS) devices have been opened against a rising average electric field of about 36 kV/cm (18 kV) in a time less than one nanosecond while operating at a repetition rate, within a two-pulse burst, of about 1 GHz. The ability to modify the frequency content of the electrical pulses, by varying the time separation, is demonstrated. Results demonstrating the operation of BOSS devices in a frequency-agile RF source configuration are also discussed.","PeriodicalId":11163,"journal":{"name":"Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91444712","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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