Pub Date : 1994-06-27DOI: 10.1109/MODSYM.1994.597069
N. Jaitly, Y.G. Chen, R. Crumley, P. Gaywood, A. Ramrus, L. Folnsbee, S. Morse, J. Canosa, S. Letzring, S. Kumpan
A total of 120 modularized Power Conditioning Units (PCUs) have been manufactured and are under installation in support of the OMEGA Laser Upgrade program at the Laboratory for Laser Energetics, University of Rochester. This turnkey power conditioning system is capable of storing 40MJ at 15kV. It consists of 60 each PCU modules for the E-stage Single Segmented Amplifiers (SSA) and 60 each PCU modules for the F-stage SSA present in the OMEGA Upgrade Laser System. Details of the PCU design, component specification/selection, and computer modeling of the PCU operating into flashlamp load is presented. Test results are presented in a companion paper [I].
{"title":"Design Of The 40 MJ Turnkey Power Conditioning System For 60-beam Omega Laser E-stage And F-stage Single Segmented Amplifiers","authors":"N. Jaitly, Y.G. Chen, R. Crumley, P. Gaywood, A. Ramrus, L. Folnsbee, S. Morse, J. Canosa, S. Letzring, S. Kumpan","doi":"10.1109/MODSYM.1994.597069","DOIUrl":"https://doi.org/10.1109/MODSYM.1994.597069","url":null,"abstract":"A total of 120 modularized Power Conditioning Units (PCUs) have been manufactured and are under installation in support of the OMEGA Laser Upgrade program at the Laboratory for Laser Energetics, University of Rochester. This turnkey power conditioning system is capable of storing 40MJ at 15kV. It consists of 60 each PCU modules for the E-stage Single Segmented Amplifiers (SSA) and 60 each PCU modules for the F-stage SSA present in the OMEGA Upgrade Laser System. Details of the PCU design, component specification/selection, and computer modeling of the PCU operating into flashlamp load is presented. Test results are presented in a companion paper [I].","PeriodicalId":330796,"journal":{"name":"Twenty-First International Power Modulator Symposium, Conference","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122465399","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 : 1994-06-27DOI: 10.1109/MODSYM.1994.597031
H.S. Ginsberg, L. Koenig
{"title":"A Pulsed Load Power Supply For High Performance Solid State Radar Transmitters","authors":"H.S. Ginsberg, L. Koenig","doi":"10.1109/MODSYM.1994.597031","DOIUrl":"https://doi.org/10.1109/MODSYM.1994.597031","url":null,"abstract":"","PeriodicalId":330796,"journal":{"name":"Twenty-First International Power Modulator Symposium, Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121266933","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 : 1994-06-27DOI: 10.1109/MODSYM.1994.597032
P. Schmolze
High power modulators contain various stages of power conversion, from low voltage AC to high voltage DC, which usually receive their input power from public utility mains. These mains are subject to transients (over voltage surges and under voltage dips) that may last from several microseconds, to several hundred milliseconds or to a total blackout of power. The power modulator must operate without failure during the transient line conditions, the full l o s s of AC power, and the restoration of AC power.
{"title":"Protection Of High Power Modulators During Main Power Loss And Recovery","authors":"P. Schmolze","doi":"10.1109/MODSYM.1994.597032","DOIUrl":"https://doi.org/10.1109/MODSYM.1994.597032","url":null,"abstract":"High power modulators contain various stages of power conversion, from low voltage AC to high voltage DC, which usually receive their input power from public utility mains. These mains are subject to transients (over voltage surges and under voltage dips) that may last from several microseconds, to several hundred milliseconds or to a total blackout of power. The power modulator must operate without failure during the transient line conditions, the full l o s s of AC power, and the restoration of AC power.","PeriodicalId":330796,"journal":{"name":"Twenty-First International Power Modulator Symposium, Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127610601","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 : 1994-06-27DOI: 10.1109/MODSYM.1994.597038
R. Richardson, R. Rush, M. Iskander
BACKGROUND matched end of line reverse voltage clipper. The thyratron is an EEV CX1722 hollow anode glass envelope air cooled device, the reverse conducting feature of this device allows the output voltage on the rf source at the end of the current pulse to flow back into the pfn. The maximum fault discharge current is 4KA and the normal maximum current is 2KA. At a prf of lOOpps maximum the device is very adequately rated and long life can be anticipated. The EPC which inhibits the application of any recharging voltage until the thyratron has fully recovered is used so that latch up and/or fire through do not present problems to the system. The EEV trigger unit type MA2437A was used for thyratron triggering to ensure rapid firing with no .jitter and minimal timing delay. More importantly, in a The system was primarily required for evaluation an rf parallel application it results in virtually no device to source that was under development. To permit the equipment device variations in these parameters. The CX1722 has been to be deployed at alternative sites for evaluation it was frequently used in multiple parallel switch applications. decided to develop the system in a form suitable for As each thyratron has its own pfn this also significantly transportation. improves the sharing of the devices.
{"title":"A 250 MW 1 uS Repetitively Pulsed Transportable Modulator Systems","authors":"R. Richardson, R. Rush, M. Iskander","doi":"10.1109/MODSYM.1994.597038","DOIUrl":"https://doi.org/10.1109/MODSYM.1994.597038","url":null,"abstract":"BACKGROUND matched end of line reverse voltage clipper. The thyratron is an EEV CX1722 hollow anode glass envelope air cooled device, the reverse conducting feature of this device allows the output voltage on the rf source at the end of the current pulse to flow back into the pfn. The maximum fault discharge current is 4KA and the normal maximum current is 2KA. At a prf of lOOpps maximum the device is very adequately rated and long life can be anticipated. The EPC which inhibits the application of any recharging voltage until the thyratron has fully recovered is used so that latch up and/or fire through do not present problems to the system. The EEV trigger unit type MA2437A was used for thyratron triggering to ensure rapid firing with no .jitter and minimal timing delay. More importantly, in a The system was primarily required for evaluation an rf parallel application it results in virtually no device to source that was under development. To permit the equipment device variations in these parameters. The CX1722 has been to be deployed at alternative sites for evaluation it was frequently used in multiple parallel switch applications. decided to develop the system in a form suitable for As each thyratron has its own pfn this also significantly transportation. improves the sharing of the devices.","PeriodicalId":330796,"journal":{"name":"Twenty-First International Power Modulator Symposium, Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122156453","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 : 1994-06-27DOI: 10.1109/MODSYM.1994.597036
H. Anamkath, S. Lyons, P. Treas, K. Whitham, A. Zante
Four identical line modulators have been designed and built as part of the 550 MeV positron-electron linear accelerator for Frascati Laboratory. This linac has been designed and is provided by Titan Beta. These modulators are capable of delivering a 100 MW peak power video pulse with a 4.5 psec flat top at 50 pps. Each modulator is resonantly charged with a requirement of +0.1% pulse to pulse amplitude stability. The four modulators are built and are under test at the factory. This paper describes the design and provides the factory test results.
{"title":"Design And Test Of 100 MW, 10 KW Modulator","authors":"H. Anamkath, S. Lyons, P. Treas, K. Whitham, A. Zante","doi":"10.1109/MODSYM.1994.597036","DOIUrl":"https://doi.org/10.1109/MODSYM.1994.597036","url":null,"abstract":"Four identical line modulators have been designed and built as part of the 550 MeV positron-electron linear accelerator for Frascati Laboratory. This linac has been designed and is provided by Titan Beta. These modulators are capable of delivering a 100 MW peak power video pulse with a 4.5 psec flat top at 50 pps. Each modulator is resonantly charged with a requirement of +0.1% pulse to pulse amplitude stability. The four modulators are built and are under test at the factory. This paper describes the design and provides the factory test results.","PeriodicalId":330796,"journal":{"name":"Twenty-First International Power Modulator Symposium, Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132206114","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 : 1994-06-27DOI: 10.1109/MODSYM.1994.597083
P. Stout, M. Kushner
Photoconductive semiconductor switches (PCSS) have high voltage hold-off and fast rise times. When operated in the nonlinear mode the requirement for optical trigger energy is reduced. A two dimensional time dependent computer model has been developed to investigate laser triggering and gain of GaAs PCSS. The role of transport of band-to-band recombination radiation in switch operation is discussed. The location of the laser spot which activates the switch is also investigated.
{"title":"Two Dimensional Modeling Of High Power Semiconductor Switches","authors":"P. Stout, M. Kushner","doi":"10.1109/MODSYM.1994.597083","DOIUrl":"https://doi.org/10.1109/MODSYM.1994.597083","url":null,"abstract":"Photoconductive semiconductor switches (PCSS) have high voltage hold-off and fast rise times. When operated in the nonlinear mode the requirement for optical trigger energy is reduced. A two dimensional time dependent computer model has been developed to investigate laser triggering and gain of GaAs PCSS. The role of transport of band-to-band recombination radiation in switch operation is discussed. The location of the laser spot which activates the switch is also investigated.","PeriodicalId":330796,"journal":{"name":"Twenty-First International Power Modulator Symposium, Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122066343","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 : 1994-06-27DOI: 10.1109/MODSYM.1994.597034
N. Jaitly, Y.G. Chen, R. Crumley, P. Gaywood, A. Ramrus, L. Folnsbee, S. Morse, J. Canosa, S. Letzring, S. Kumpan
Maxwell fabricated and acceptance tested an F-stage prototype Power Conditioning Unit (PCU) prior to fabrication of 60 E-stage PCUs and 60 F-stage PCUs. This 120 unit modularized turnkey power conditioning system has been designed in support of the OMEGA Laser Upgrade program at the Laboratory for Laser Energetics, University of Rochester (URLLE). The upgraded OMEGA experimental facility, dedicated to laser driven inertial confinement fusion for development of alternative energy source, will deliver 30kJ to the target pellet via a 60-beam direct-drive 351nm Laser System.
{"title":"Performance Test Results Of Prototype F-stage Power Conditioning Unit For The 60-beam Omega Laser Upgrade","authors":"N. Jaitly, Y.G. Chen, R. Crumley, P. Gaywood, A. Ramrus, L. Folnsbee, S. Morse, J. Canosa, S. Letzring, S. Kumpan","doi":"10.1109/MODSYM.1994.597034","DOIUrl":"https://doi.org/10.1109/MODSYM.1994.597034","url":null,"abstract":"Maxwell fabricated and acceptance tested an F-stage prototype Power Conditioning Unit (PCU) prior to fabrication of 60 E-stage PCUs and 60 F-stage PCUs. This 120 unit modularized turnkey power conditioning system has been designed in support of the OMEGA Laser Upgrade program at the Laboratory for Laser Energetics, University of Rochester (URLLE). The upgraded OMEGA experimental facility, dedicated to laser driven inertial confinement fusion for development of alternative energy source, will deliver 30kJ to the target pellet via a 60-beam direct-drive 351nm Laser System.","PeriodicalId":330796,"journal":{"name":"Twenty-First International Power Modulator Symposium, Conference","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115635306","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 : 1994-06-27DOI: 10.1109/MODSYM.1994.597027
W. Reass
This paper describes the electrical design and operation of a high power modulator system implemented for the Los Alamos Plasma Source Ion Implantation (PSII) facility. To test the viability of the PSII process for various automotive components, the modulator must accept wide variations of load impedance. Components have varying area and composition which must be processed with different plasmas. Additionally, the load impedance may change by large factors during the typical 20 uS pulse, due to plasma displacement currents and sheath growth. As a preliminary design to test the system viability for automotive component implantation, suitable for a manufacturing environment, circuit topology must be able to directly scale to high power versions, for increased component through-put. We have chosen an evolutionary design approach with component families of characterized performance, which should Ion result in a reliable modulator system with component lifetimes. The modulator utilizes a pair of Litton L-3408 hollow beam amplifier tubes as switching elements in a ``hot-deck`` configuration. Internal to the main of planar triode hot deck, an additional pair decks, configured in a totem pole circuit, provide input drive to the L-3408 mod-anodes. The modulator can output over 2 amps average current (at 100 kV) with 1more » kW of modanode drive. Diagnostic electronics monitor the load and stops pulses for 100 mS when a load arcs occur. This paper, in addition to providing detailed engineering design information, will provide operational characteristics and reliability data that direct the design to the higher power, mass production line capable modulators.« less
{"title":"System Design And Operation Of A 100 Kilovolt, 2 Kilohertz Pulse Modulator For Plasma Source Ion Implantation","authors":"W. Reass","doi":"10.1109/MODSYM.1994.597027","DOIUrl":"https://doi.org/10.1109/MODSYM.1994.597027","url":null,"abstract":"This paper describes the electrical design and operation of a high power modulator system implemented for the Los Alamos Plasma Source Ion Implantation (PSII) facility. To test the viability of the PSII process for various automotive components, the modulator must accept wide variations of load impedance. Components have varying area and composition which must be processed with different plasmas. Additionally, the load impedance may change by large factors during the typical 20 uS pulse, due to plasma displacement currents and sheath growth. As a preliminary design to test the system viability for automotive component implantation, suitable for a manufacturing environment, circuit topology must be able to directly scale to high power versions, for increased component through-put. We have chosen an evolutionary design approach with component families of characterized performance, which should Ion result in a reliable modulator system with component lifetimes. The modulator utilizes a pair of Litton L-3408 hollow beam amplifier tubes as switching elements in a ``hot-deck`` configuration. Internal to the main of planar triode hot deck, an additional pair decks, configured in a totem pole circuit, provide input drive to the L-3408 mod-anodes. The modulator can output over 2 amps average current (at 100 kV) with 1more » kW of modanode drive. Diagnostic electronics monitor the load and stops pulses for 100 mS when a load arcs occur. This paper, in addition to providing detailed engineering design information, will provide operational characteristics and reliability data that direct the design to the higher power, mass production line capable modulators.« less","PeriodicalId":330796,"journal":{"name":"Twenty-First International Power Modulator Symposium, Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122393559","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 : 1994-06-27DOI: 10.1109/MODSYM.1994.597087
A. Anders, S. Anders, V. Puchkarev, M. Gundersen
{"title":"A Predictive Model for Life-Limiting Cathode Emission in the Pseudospark and Back-Lighted Thyratron","authors":"A. Anders, S. Anders, V. Puchkarev, M. Gundersen","doi":"10.1109/MODSYM.1994.597087","DOIUrl":"https://doi.org/10.1109/MODSYM.1994.597087","url":null,"abstract":"","PeriodicalId":330796,"journal":{"name":"Twenty-First International Power Modulator Symposium, Conference","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130005059","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 : 1994-06-27DOI: 10.1109/MODSYM.1994.597072
J. Kinross-wright, J. Plato
This paper describes a 1300 MHz klystron and modulator system recently constructed for the Advanced Free Electron Laser (AFEL) project at Los Alamos National Laboratory. The AFEL is a very compact high power FEL. The new RF system was developed to supply up to 30 megawatts peak power, 30 microsecond pulse width and up to 100 hertz repetition rate. The average RF output power goal is 50 kilowatts. The fifty kilowatts will allow the FEL to produce at least 1 kilowatt of infrared light output. The key feature of an FEL RF system is phase and amplitude stability. The modulator is a thyratron-switched line-type design. The major goals of the modulator are reasonably compact size and automated operation. One notable feature is the use of five large switching power supplies in parallel to charge the pulse forming network. These supplies are a major contributor to the compact size of the modulator. The design of the modulator will be discussed along with the techniques employed to achieve stability, compact size, and automated operation. Modulator and RF performance wiil be described.
{"title":"Klystron Station For The Advanced Free Electron Laser","authors":"J. Kinross-wright, J. Plato","doi":"10.1109/MODSYM.1994.597072","DOIUrl":"https://doi.org/10.1109/MODSYM.1994.597072","url":null,"abstract":"This paper describes a 1300 MHz klystron and modulator system recently constructed for the Advanced Free Electron Laser (AFEL) project at Los Alamos National Laboratory. The AFEL is a very compact high power FEL. The new RF system was developed to supply up to 30 megawatts peak power, 30 microsecond pulse width and up to 100 hertz repetition rate. The average RF output power goal is 50 kilowatts. The fifty kilowatts will allow the FEL to produce at least 1 kilowatt of infrared light output. The key feature of an FEL RF system is phase and amplitude stability. The modulator is a thyratron-switched line-type design. The major goals of the modulator are reasonably compact size and automated operation. One notable feature is the use of five large switching power supplies in parallel to charge the pulse forming network. These supplies are a major contributor to the compact size of the modulator. The design of the modulator will be discussed along with the techniques employed to achieve stability, compact size, and automated operation. Modulator and RF performance wiil be described.","PeriodicalId":330796,"journal":{"name":"Twenty-First International Power Modulator Symposium, Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130487275","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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