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F Davanloo - One of the best experts on this subject based on the ideXlab platform.

  • ultra fast flash x ray pulses produced by Blumlein devices
    Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2005
    Co-Authors: F Davanloo, C B Collins, F J Agee
    Abstract:

    Abstract The flash X-ray systems developed at the University of Texas at Dallas (UTD) centers on two critical subassemblies: (1) a Blumlein pulsed power source and (2) an X-ray diode properly designed and matched to the pulse forming line. The pulse generator consists of either a single or several triaxial Blumleins. For multiple lines, Blumleins are stacked in series at one end and charged in parallel and synchronously commutated with a single switching element at the other end. In this way, relatively low charging voltages are multiplied to give a high discharge voltage across an X-ray diode. Extensive characterization of these Blumlein pulsers have been performed over the past several years. Results indicate that they are capable of producing high-power waveforms with risetimes and repetition rates in the range of 0.1–50 ns and 1–1000 Hz, respectively, using a conventional thyratron, spark gap, or photoconductive switch. Our recent efforts have for the first time resulted in implementation and demonstration of high-power stacked Blumlein pulsers commutated by a single photoconductive switch. Presently, these devices reliably produce 50–100 MW output waveforms with pulse durations of 1–3 ns and risetimes as fast as 150 ps. Prospects for producing X-rays with such fast-switching devices are discussed.

  • flash x ray sources powered by Blumlein pulsers review and prospect for x rays with 100 ps switching
    International Symposium on Optical Science and Technology, 2002
    Co-Authors: F Davanloo, C B Collins, F J Agee
    Abstract:

    The flash x-ray systems developed at the University of Texas at Dallas (UTD) center around two critical subassemblies: (1) a Blumlein pulsed power source, and (2) an x-ray diode properly designed and matched to the pulse forming line. The pulse generator consists of either a single or several traxial Blumleins. For multiple lines, Blumleins are stacked in series at one end and charged in parallel and synchronously commutated with a single switching element at the other end. Extensive characterizations of these Blumlein pulsers have been performed over the past several years. Results indicate that they are capable of producing high power waveforms with risetimes and repetition rates in the range of 0.1-50 ns and 1-300 Hz, respectively, using a conventional thyratron, spark gap, or photoconductive switch. Blumlein pulsers switched by a thyratron or a spark gap have been used to drive x-ray diode loads with different characteristics and discharge geometries and high dose rates of x-rays with pulse durations in the range 3-20 ns have been obtained. In this report the technology and characteristics of these Blumlein based flash x-ray devices are reviewed. Prospects for producing ultra-fast x-ray pulses utilizing photoconductively-switched Blumlein devices are discussed.

  • photoconductive switch enhancements and lifetime studies for use in stacked Blumlein pulsers
    IEEE Transactions on Plasma Science, 2000
    Co-Authors: F Davanloo, C B Collins, R Dussart, K J Koivusaari, F J Agee
    Abstract:

    Photoconductive switching of the stacked Blumlein pulsers, developed at the University of Texas at Dallas, currently produces high-power nanosecond pulses with risetimes on the order of 200 ps. The device has a compact geometry and is commutated by a single GaAs switch triggered by a low-power laser diode array. This report presents the progress toward improving the high-gain switch operation and lifetime in stacked Blumlein pulsers. Feasibility of the use of amorphic diamond to enhance the switch operation and longevity is studied. Improvement in switch lifetime was demonstrated by coating the triggered face of a GaAs switch cathode with highly adhesive film of amorphic diamond. Relevant semiconductor properties of amorphic diamond are discussed.

  • high power repetitive stacked Blumlein pulsers commutated by a single switching element
    IEEE Transactions on Plasma Science, 1998
    Co-Authors: F Davanloo, C B Collins, F J Agee
    Abstract:

    The stacked Blumlein pulse generators developed at the University of Texas at Dallas consist of several triaxial Blumleins stacked in series at one end. The lines are charged in parallel and synchronously commutated with a single switching element at the other end, In this may, relatively low charging voltages are multiplied to give a higher desired voltage across an arbitrary load. Extensive characterization of the stacked Blumlein pulsers indicates that these devices are capable of producing high-power pulses with rise times and repetition rates in the range of 0.3-50 ns and 1-300 Hz, respectively, using a conventional thyratron, spark gap, or photoconductive switch. This paper presents the progress in the development and use of these novel pulsers. Recent adaptation of the design has enabled the stacked Blumlein to produce 50-70 MW nanosecond pulses with risetimes on the order of 200-300 ps into nominally matched loads. The device has a compact line geometry and is commutated by a single photoconductive switch triggered by a low power laser diode.

  • progress in the development of stacked Blumlein pulsers commutated by photoconductive switches
    International Power Modulator Symposium, 1998
    Co-Authors: F Davanloo, C B Collins, H Park, R Dussart, M C Iosif, F J Agee
    Abstract:

    Adaptation of the stacked Blumlein pulser designed and patented in our laboratory has enabled it to produce powers as great as 50-70 MW, in nanosecond pulses with risetimes on the order of 200-300 ps into nominally matched loads. The device has a compact line geometry and is commutated by a single photoconductive switch triggered by a low power laser diode array. The main objective of our research is to enlarge the level of understanding and identify design options which make optimal use of avalanche photoconductive switches for stacked Blumlein based ultra-wideband (UWB) sources. This paper presents progress in the development and characterization of stacked Blumlein pulsers commutated by photoconductive switches.

C B Collins - One of the best experts on this subject based on the ideXlab platform.

  • ultra fast flash x ray pulses produced by Blumlein devices
    Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2005
    Co-Authors: F Davanloo, C B Collins, F J Agee
    Abstract:

    Abstract The flash X-ray systems developed at the University of Texas at Dallas (UTD) centers on two critical subassemblies: (1) a Blumlein pulsed power source and (2) an X-ray diode properly designed and matched to the pulse forming line. The pulse generator consists of either a single or several triaxial Blumleins. For multiple lines, Blumleins are stacked in series at one end and charged in parallel and synchronously commutated with a single switching element at the other end. In this way, relatively low charging voltages are multiplied to give a high discharge voltage across an X-ray diode. Extensive characterization of these Blumlein pulsers have been performed over the past several years. Results indicate that they are capable of producing high-power waveforms with risetimes and repetition rates in the range of 0.1–50 ns and 1–1000 Hz, respectively, using a conventional thyratron, spark gap, or photoconductive switch. Our recent efforts have for the first time resulted in implementation and demonstration of high-power stacked Blumlein pulsers commutated by a single photoconductive switch. Presently, these devices reliably produce 50–100 MW output waveforms with pulse durations of 1–3 ns and risetimes as fast as 150 ps. Prospects for producing X-rays with such fast-switching devices are discussed.

  • flash x ray sources powered by Blumlein pulsers review and prospect for x rays with 100 ps switching
    International Symposium on Optical Science and Technology, 2002
    Co-Authors: F Davanloo, C B Collins, F J Agee
    Abstract:

    The flash x-ray systems developed at the University of Texas at Dallas (UTD) center around two critical subassemblies: (1) a Blumlein pulsed power source, and (2) an x-ray diode properly designed and matched to the pulse forming line. The pulse generator consists of either a single or several traxial Blumleins. For multiple lines, Blumleins are stacked in series at one end and charged in parallel and synchronously commutated with a single switching element at the other end. Extensive characterizations of these Blumlein pulsers have been performed over the past several years. Results indicate that they are capable of producing high power waveforms with risetimes and repetition rates in the range of 0.1-50 ns and 1-300 Hz, respectively, using a conventional thyratron, spark gap, or photoconductive switch. Blumlein pulsers switched by a thyratron or a spark gap have been used to drive x-ray diode loads with different characteristics and discharge geometries and high dose rates of x-rays with pulse durations in the range 3-20 ns have been obtained. In this report the technology and characteristics of these Blumlein based flash x-ray devices are reviewed. Prospects for producing ultra-fast x-ray pulses utilizing photoconductively-switched Blumlein devices are discussed.

  • photoconductive switch enhancements and lifetime studies for use in stacked Blumlein pulsers
    IEEE Transactions on Plasma Science, 2000
    Co-Authors: F Davanloo, C B Collins, R Dussart, K J Koivusaari, F J Agee
    Abstract:

    Photoconductive switching of the stacked Blumlein pulsers, developed at the University of Texas at Dallas, currently produces high-power nanosecond pulses with risetimes on the order of 200 ps. The device has a compact geometry and is commutated by a single GaAs switch triggered by a low-power laser diode array. This report presents the progress toward improving the high-gain switch operation and lifetime in stacked Blumlein pulsers. Feasibility of the use of amorphic diamond to enhance the switch operation and longevity is studied. Improvement in switch lifetime was demonstrated by coating the triggered face of a GaAs switch cathode with highly adhesive film of amorphic diamond. Relevant semiconductor properties of amorphic diamond are discussed.

  • high power repetitive stacked Blumlein pulsers commutated by a single switching element
    IEEE Transactions on Plasma Science, 1998
    Co-Authors: F Davanloo, C B Collins, F J Agee
    Abstract:

    The stacked Blumlein pulse generators developed at the University of Texas at Dallas consist of several triaxial Blumleins stacked in series at one end. The lines are charged in parallel and synchronously commutated with a single switching element at the other end, In this may, relatively low charging voltages are multiplied to give a higher desired voltage across an arbitrary load. Extensive characterization of the stacked Blumlein pulsers indicates that these devices are capable of producing high-power pulses with rise times and repetition rates in the range of 0.3-50 ns and 1-300 Hz, respectively, using a conventional thyratron, spark gap, or photoconductive switch. This paper presents the progress in the development and use of these novel pulsers. Recent adaptation of the design has enabled the stacked Blumlein to produce 50-70 MW nanosecond pulses with risetimes on the order of 200-300 ps into nominally matched loads. The device has a compact line geometry and is commutated by a single photoconductive switch triggered by a low power laser diode.

  • progress in the development of stacked Blumlein pulsers commutated by photoconductive switches
    International Power Modulator Symposium, 1998
    Co-Authors: F Davanloo, C B Collins, H Park, R Dussart, M C Iosif, F J Agee
    Abstract:

    Adaptation of the stacked Blumlein pulser designed and patented in our laboratory has enabled it to produce powers as great as 50-70 MW, in nanosecond pulses with risetimes on the order of 200-300 ps into nominally matched loads. The device has a compact line geometry and is commutated by a single photoconductive switch triggered by a low power laser diode array. The main objective of our research is to enlarge the level of understanding and identify design options which make optimal use of avalanche photoconductive switches for stacked Blumlein based ultra-wideband (UWB) sources. This paper presents progress in the development and characterization of stacked Blumlein pulsers commutated by photoconductive switches.

F J Agee - One of the best experts on this subject based on the ideXlab platform.

  • ultra fast flash x ray pulses produced by Blumlein devices
    Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2005
    Co-Authors: F Davanloo, C B Collins, F J Agee
    Abstract:

    Abstract The flash X-ray systems developed at the University of Texas at Dallas (UTD) centers on two critical subassemblies: (1) a Blumlein pulsed power source and (2) an X-ray diode properly designed and matched to the pulse forming line. The pulse generator consists of either a single or several triaxial Blumleins. For multiple lines, Blumleins are stacked in series at one end and charged in parallel and synchronously commutated with a single switching element at the other end. In this way, relatively low charging voltages are multiplied to give a high discharge voltage across an X-ray diode. Extensive characterization of these Blumlein pulsers have been performed over the past several years. Results indicate that they are capable of producing high-power waveforms with risetimes and repetition rates in the range of 0.1–50 ns and 1–1000 Hz, respectively, using a conventional thyratron, spark gap, or photoconductive switch. Our recent efforts have for the first time resulted in implementation and demonstration of high-power stacked Blumlein pulsers commutated by a single photoconductive switch. Presently, these devices reliably produce 50–100 MW output waveforms with pulse durations of 1–3 ns and risetimes as fast as 150 ps. Prospects for producing X-rays with such fast-switching devices are discussed.

  • flash x ray sources powered by Blumlein pulsers review and prospect for x rays with 100 ps switching
    International Symposium on Optical Science and Technology, 2002
    Co-Authors: F Davanloo, C B Collins, F J Agee
    Abstract:

    The flash x-ray systems developed at the University of Texas at Dallas (UTD) center around two critical subassemblies: (1) a Blumlein pulsed power source, and (2) an x-ray diode properly designed and matched to the pulse forming line. The pulse generator consists of either a single or several traxial Blumleins. For multiple lines, Blumleins are stacked in series at one end and charged in parallel and synchronously commutated with a single switching element at the other end. Extensive characterizations of these Blumlein pulsers have been performed over the past several years. Results indicate that they are capable of producing high power waveforms with risetimes and repetition rates in the range of 0.1-50 ns and 1-300 Hz, respectively, using a conventional thyratron, spark gap, or photoconductive switch. Blumlein pulsers switched by a thyratron or a spark gap have been used to drive x-ray diode loads with different characteristics and discharge geometries and high dose rates of x-rays with pulse durations in the range 3-20 ns have been obtained. In this report the technology and characteristics of these Blumlein based flash x-ray devices are reviewed. Prospects for producing ultra-fast x-ray pulses utilizing photoconductively-switched Blumlein devices are discussed.

  • photoconductive switch enhancements and lifetime studies for use in stacked Blumlein pulsers
    IEEE Transactions on Plasma Science, 2000
    Co-Authors: F Davanloo, C B Collins, R Dussart, K J Koivusaari, F J Agee
    Abstract:

    Photoconductive switching of the stacked Blumlein pulsers, developed at the University of Texas at Dallas, currently produces high-power nanosecond pulses with risetimes on the order of 200 ps. The device has a compact geometry and is commutated by a single GaAs switch triggered by a low-power laser diode array. This report presents the progress toward improving the high-gain switch operation and lifetime in stacked Blumlein pulsers. Feasibility of the use of amorphic diamond to enhance the switch operation and longevity is studied. Improvement in switch lifetime was demonstrated by coating the triggered face of a GaAs switch cathode with highly adhesive film of amorphic diamond. Relevant semiconductor properties of amorphic diamond are discussed.

  • Photoconductive switch enhancements and lifetime studies for use in stacked Blumlein pulsers
    Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358), 1999
    Co-Authors: Farzin Davanloo, M C Iosif, R. Dussartt, Carl B. Collins, F J Agee
    Abstract:

    Photoconductive switching of the stacked Blumlein pulsers, developed at the University of Texas at Dallas, currently produces high power, nanosecond pulses with risetimes of the order of 200 ps. The device has a compact geometry and is commutated by a single GaAs switch triggered by a low power laser diode array. This report presents the progress toward improving the high gain switch operation and lifetime in stacked Blumlein pulsers. Feasibility of the use of amorphic diamond to enhance the switch operation and longevity is discussed. Improvement in switch lifetime was demonstrated by coating the triggered face of a GaAs switch cathode with highly adhesive film of amorphic diamond.

  • high power repetitive stacked Blumlein pulsers commutated by a single switching element
    IEEE Transactions on Plasma Science, 1998
    Co-Authors: F Davanloo, C B Collins, F J Agee
    Abstract:

    The stacked Blumlein pulse generators developed at the University of Texas at Dallas consist of several triaxial Blumleins stacked in series at one end. The lines are charged in parallel and synchronously commutated with a single switching element at the other end, In this may, relatively low charging voltages are multiplied to give a higher desired voltage across an arbitrary load. Extensive characterization of the stacked Blumlein pulsers indicates that these devices are capable of producing high-power pulses with rise times and repetition rates in the range of 0.3-50 ns and 1-300 Hz, respectively, using a conventional thyratron, spark gap, or photoconductive switch. This paper presents the progress in the development and use of these novel pulsers. Recent adaptation of the design has enabled the stacked Blumlein to produce 50-70 MW nanosecond pulses with risetimes on the order of 200-300 ps into nominally matched loads. The device has a compact line geometry and is commutated by a single photoconductive switch triggered by a low power laser diode.

L E Kingsley - One of the best experts on this subject based on the ideXlab platform.

  • stacked Blumlein pulse generators
    International Power Modulator Symposium, 1996
    Co-Authors: F Davanloo, C B Collins, F J Agee, D L Borovina, R K Krause, J L Korioth, J H Hull, L E Kingsley
    Abstract:

    Extensive characterization of stacked Blumlein pulsers has been performed over the past few years. Results indicate that these devices are capable of producing high-power waveforms with risetimes and repetition rates in the range of 0.2-50 ns and 1-300 Hz, respectively, using a conventional thyratron, spark gap or photoconductive switch. This paper reviews the progress made to date in the development of these novel pulsers. It is shown that, with slight design modifications, they can produce pulsed power waveforms with fast risetimes and a wide range of pulse durations and peak values. An analysis of the behavior of the stacked Blumlein pulsers is given and the results of performance tests are discussed.

  • high power repetitive stacked Blumlein pulse generators
    High-Power Particle Beams 1996 11th International Conference on, 1996
    Co-Authors: F Davanloo, C B Collins, F J Agee, D L Borovina, R K Krause, J L Korioth, L E Kingsley
    Abstract:

    The repetitive stacked Blumlein pulse power generators developed at the University of Texas at Dallas consist of several triaxial Blumleins stacked in series at one end. The lines are charged in parallel and synchronously commuted with a single switch at the other end. In this way, relatively low charging voltages are multiplied to give a high discharge voltage across an arbitrary load. Extensive characterization of these novel pulsers have been performed over the past few years. Results indicate that they are capable of producing high power waveforms with rise times and repetition rates in the range of 0.5-50 ns and 1-300 Hz, respectively, using a conventional thyratron, spark gap, or photoconductive switch. The progress in the development and use of stacked Blumlein pulse generators is reviewed. The technology and the characteristics of these novel pulsers driving flash x-ray diodes are discussed. (author). 4 figs., 5 refs.

  • switching the stacked Blumlein pulsers status and issues
    IEEE International Pulsed Power Conference, 1995
    Co-Authors: D L Borovina, F Davanloo, C B Collins, F J Agee, R K Krause, L E Kingsley
    Abstract:

    The repetitive stacked Blumlein pulse power generators developed at the University of Texas at Dallas consist of several triaxial Blumleins stacked in series at one end. The lines are charged in parallel and synchronously commuted with a single switch at the other end. In this way, relatively low charging voltages are multiplied to give a high discharge voltage across an arbitrary load. To date, the stacked Blumlein pulsers have produced high power waveforms with risetimes and repetition rates in the range of 5-50 ns and 1-200 Hz, respectively, using a conventional thyratron or spark gap. To generate waveforms with sub-nanosecond risetimes at kilo-Hertz repetition rates, fast switching devices such as photoconductive switches must be utilized. This paper describes the feasibility of an intense pulse power source based upon stacked Blumlein technology by adapting the design for use with photoconductive switches.

  • repetitively pulsed high power stacked Blumlein generators
    Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 1995
    Co-Authors: F Davanloo, C B Collins, F J Agee, D L Borovina, L E Kingsley
    Abstract:

    Abstract The stacked Blumlein pulse generators developed at the University of Texas at Dallas consist of several triaxial Blumleins stacked in series at one end. The lines are charged in parallel and synchronously commuted with a single switching element at the other end. In this way, relatively low charging voltages are multiplied to give the desired discharge voltage across an arbitrary load. Described here is the progress in development and characterization of these novel pulse-power generators capable of discharging at high repetition rates. The introduction of a tapered transmission line concept to the stacked Blumlein design provided fine tuning of output waveforms.

  • high power repetitive stacked Blumlein pulse generators commuted by a single switching element
    Conference Record on Power Modulator Symposium, 1992
    Co-Authors: F Davanloo, C B Collins, F J Agee, J D Bhawalkar, L E Kingsley
    Abstract:

    The stacked Blumlein pulse power source developed at the University of Texas at Dallas consists of several triaxial Blumleins stacked in series at one end. The lines are charged in parallel and synchronously commuted with a single switching element at the other end. In this way relatively low charging voltages are multiplied to give the desired discharge voltage across an arbitrary load without the need for complex Marx bank circuitry. In this work, performance of this novel pulser with different line configurations prior and after stacking the lines has been characterized. The voltage gain across a matched load approaches the number of lines. Higher voltage gains available from the pulser with extended charging plates are attributed to the reduction of parasitic modes. Effects of different line configurations in the pulse durations of generated waveforms are discussed.

Matthew T Domonkos - One of the best experts on this subject based on the ideXlab platform.

  • STACKED, PARALLEL-PLATE SOLID-DIELECTRIC Blumlein LINES FOR COMPACT PULSED POWER
    2016
    Co-Authors: Matthew T Domonkos, Tyrone C Tran, P J Turchi, C W Gregg, J V Parker, James P. O’loughlin, Darwin Brown, Kirk Slenes
    Abstract:

    The stacked Blumlein line is a concept that has been touted as a highly compact pulsed power system because it combines the functions of energy storage, voltage scaling, and pulse shaping into a single sub-system. As a result, two single stage Blumlein lines have been fabricated and tested using a polymer-ceramic composite dielectric. Examination of the breakdown of the dielectric near the DC voltage specification led to the understanding of the degree of voltage reversal experienced by the lines. Voltage reversal is compounded in a stacked arrangement. The voltage reversal and transients induced by the switch jitter in a stacked configuration require significant derating of the dielectric strength. Consequently, the system must be operated much below the intrinsic dielectric energy density, compromising efforts to design a compact pulsed power system. This paper presents the conclusion that for derating below 0.72, as is likely necessary, a stacked Blumlein line will contain more dielectric than a comparable stacked transmission line. I

  • Switching Requirements for Stacked Blumleins Commutated by Individual Switches
    2015
    Co-Authors: Matthew T Domonkos
    Abstract:

    Abstract- Stacked Blumlein lines with solid dielectric potentially offer a compact pulsed power system for a variety of applications by combining the energy storage, voltage scaling, and pulse forming functions into a single device. By stacking the lines physically, not simply electrically, the line is made more compact because adjacent lines share electrodes. This design does not lend itself to the use of a single switch to commutate the stacked line, and multiple switches are far simpler to implement. The switch jitter and electrical characteristics strongly influence the performance of the line and the stresses on the dielectric. This paper explores the effects of switch jitter, inductance, the resistive decay during closure, and the closed-state resistance on the output pulse and dielectric stresses for stacked Blumlein lines using SPICE simulations. The impact of switch operation on the necessary dielectric strength and the quality of pulse is presented. The suitability of various switch technologies to meet the performance requirements is also discussed. I

  • stacked parallel plate solid dielectric Blumlein lines for compact pulsed power
    International Conference on Plasma Science, 2007
    Co-Authors: Matthew T Domonkos, J P Oloughlin, Tyrone C Tran, P J Turchi, D J Brown, C W Gregg, J V Parker, Thomas Montoya, Kirk Slenes
    Abstract:

    Summary form only given. The stacked Blumlein line is a concept that has been touted as a highly compact pulsed power system because of its combination of the functions of energy storage, voltage scaling, and pulse shaping into a single sub-system. In reality, the voltage reversal and transients induced by the operation of the stacked lines and the switch jitter require significant derating of the dielectric strength. Consequently, the system must be operated much below the intrinsic dielectric energy density, compromising efforts to design a compact pulsed power system. Nevertheless, composite dielectrics have renewed interest in stacked Blumlein lines for compact pulsed power. This paper discusses the limitations on the energy density of stacked Blumlein lines as well as efforts to develop stacked Blumlein lines using a ceramic loaded polymer composite dielectric. Experiments have been conducted to evaluate electrically triggered spark-gap switches for use in testing stacked lines. Additionally, small capacitors have been fabricated using the same composite dielectric used for the Blumlein lines. The capacitors have been tested to evaluate the material and thereby inform testing of multiple-stage Blumlein lines.