Design and Application of a Diode-Directed Solid-State Marx Modulator

Dale, Gregory E.; Kirbie, H.C.; Haynes, W.B.; Heath, C.E.; López, Toni; Romero, Frank Patrick; Wheat, R.M.

doi:10.1109/ppc.2005.300572

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…For this discussion the results from operation of the modular Marx modulator described in [1] and [2] will be presented. (Note that these data were collected before the minimum time step became introduced into the system.)…”

Section: Performancementioning

confidence: 99%

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Multiple output timing and trigger generator

Wheat¹,

Dalex²

2009

2009 IEEE Pulsed Power Conference

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In support of the development of a multiple stage pulse modulator at the Los Alamos National Laboratory, we have developed a first generation, multiple output timing and trigger generator. Exploiting Commercial Off The Shelf (COTS) Micro Controller Units (MCU's), the timing and trigger generator provides 32 independent outputs with a timing resolution of about 500 ns. The timing and trigger generator system is comprised of two MCU boards and a single PC. One of the MCU boards performs the functions of the timing and signal generation (the timing controller) while the second MCU board accepts commands from the PC and provides the timing instructions to the timing controller. The PC provides the user interface for adjusting the on and off timing for each of the output signals. This system provides 32 output or timing signals which can be pre-programmed to be in an on or off state for each of 64 time steps. The width or duration of each of the 64 time steps is programmable from 2 µs to 2.5 ms with a minimum time resolution of 500 ns. The repetition rate of the programmed pulse train is only limited by the time duration of the programmed event. This paper describes the design and function of the timing and trigger generator system and software including test results and measurements.

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Section: Performancementioning

confidence: 99%

“…In [1] and [2] is described a multiple module Marx-Modulator with the capability to have each module triggered independently. Development work on the Marx-Modulator at Los Alamos National Laboratory identified the need for a scalable, programmable, multiple output trigger and timing generator in order to trigger each separate Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Multiple output timing and trigger generator

Wheat¹,

Dalex²

2009

2009 IEEE Pulsed Power Conference

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“…Other configurations using inductors or fast-recovery diodes were proposed. Especially, the diodes provide the low-loss and low-impedance path for charging and the high-impedance path for discharging [9]. The required number of Marx stages should be minimized and arranged to obtain the full HV generator.…”

Section: Introductionmentioning

confidence: 99%

Solid-state pulse modulator using Marx generator for a medical linac electron-gun

et al. 2016

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A medical linac is used for the cancer treatment and consists of an accelerating column, waveguide components, a magnetron, an electron-gun, a pulse modulator, and an irradiation system. The pulse modulator based on hydrogen thyratron-switched pulse-forming network is commonly used in linac. As the improvement of the high power semiconductors in switching speed, voltage rating, and current rating, an insulated gate bipolar transistor has become the more popular device used for pulsed power systems. We propose a solid-state pulse modulator to generator high voltage by multi-stacked storage-switch stages based on the Marx generator. The advantage of our modulator comes from the use of two semiconductors to control charging and discharging of the storage capacitor at each stage and it allows to generate the pulse with various amplitudes, widths, and shapes. In addition, a gate driver for two semiconductors is designed to reduce the control channels and to protect the circuits. It is developed for providing the pulsed power to a medical linac electron-gun that requires 25 kV and 1 A as the first application. In order to improve the power efficiency and achieve the compactness modulator, a capacitor charging power supply, a Marx pulse generator, and an electron-gun heater isolated transformer are constructed and integrated. This technology is also being developed to extend the high power pulsed system with > 1 MW and also other applications such as a plasma immersed ion implantation and a micro pulse electrostatic precipitator which especially require variable pulse shape and high repetition rate > 1 kHz. The paper describes the design features and the construction of this solid-state pulse modulator. Also shown are the performance results into the linac electron-gun. K: Pulsed power; Instrumentation for gamma-electron therapy; Instrumentation for particle accelerators and storage rings -low energy (linear accelerators, cyclotrons, electrostatic accelerators)1Corresponding author.

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“…A circuit is presented in [7,8], in which some of the storage capacitors are charged through a common inductor and two circuits of diodes connected in series. In addition, there are two more charging circuits, including one for the partial charging of storage capacitors via the load.…”

Section: Introductionmentioning

confidence: 99%

Modification of Marx generator with a doubling of output voltage

Tatur

2013

Circuit Theory & Apps

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A multistage generator of high-voltage pulses with a doubling of output voltage built according to the Marx scheme is presented. A specific feature of the generator circuit design is the substitution of charging diodes for charging resistors and connection of the supplying voltage through an inductor. Such a design makes it possible to double the amplitude of pulses across a load, which is proportional to the number of connected stages, and to minimize the power loss during the charging of storage capacitors.provide galvanic isolation. Figure 7 shows voltage and current oscillograms for the active load R LOAD = 400 Ω. The actual voltage and current amplitudes were 7.4 kV and 18.5 A, respectively.Current and voltage pulses were recorded by means of Pearson Current Monitor 8450 and Tektronix P6015A high-voltage probe. Signals were displayed on Wane Jet 322 oscillograph by Le Croy company. CONCLUSIONSThis paper demonstrates principal ability to obtain doubled voltage in Marx circuit. As distinguished from the known Marx circuit designs, where amplitude of the output voltage pulses is proportional to a number of cascades U out = U 0 n, the circuit described in this paper produces doubled output voltage pulses U out = 2U 0 n. Theoretical grounds are given for improving the efficiency of charging circuits. Experimental data verifying the suggested designs are presented as well. Figure 7. Oscillograms: (а) voltage across the load and (b) current across the load.420 V. V. TATUR

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Design and Application of a Diode-Directed Solid-State Marx Modulator

Cited by 13 publications

References 13 publications

Multiple output timing and trigger generator

Multiple output timing and trigger generator

Solid-state pulse modulator using Marx generator for a medical linac electron-gun

Modification of Marx generator with a doubling of output voltage

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