Electron Beam Generation in Plasma-Filled Diodes

Miller, Paul A.; Poukey, J. W.; Wright, Thomas P.

doi:10.1103/physrevlett.35.940

Cited by 72 publications

(14 citation statements)

References 12 publications

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“…Transferred charge through the plasma channel increased from 4.5 to 10 μC. According to existing models [16]- [18] the end of the low-resistance phase is determined by some critical value of the current or the charge, depending on the plasma channel parameters.…”

Section: Power Increase By Mean Of the Diode Currentmentioning

confidence: 99%

“…According to widely accepted model [16] limiting current in a plasma-filled diode is defined by an ion saturation current in bipolar form, hence by the plasma parameters. However, attempt to increase current in the low-resistance phase by subsequent increase in the plasma density (or volume), leads as a rule, to decrease of the diode resistance rise rate and resistance amplitude.…”

Section: Power Increase By Mean Of the Diode Currentmentioning

confidence: 99%

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Power Increase of the Electron Source Based on the Plasma-Filled Diode

Zherlitsyn

Kovalchuk

Pedin

2015

IEEE Trans. Plasma Sci.

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The technique of a linear transformer driver (LTD) now allows building the generators of high-power nanosecond pulses with the current rise time of ∼100 ns without intermediate power compression stages. This technique is being examined for use in high-current high-voltage electron sources based on plasma-filled diodes. The power of a plasma-filled diode is determined by the driving circuit parameters and the transition diode resistance. The problem of power rise can be solved by increasing the stored energy in the circuit inductance provided that the diode resistance rise rate is constant. In experiments on the LTD (53 nF, 480 kV), the possibility has been checked out for such increase in the stored energy. A current increase from 50 to 180 kA was obtained by increasing the current rise rate from 0.4 to 1.9 kA/ns. Stored energy has been increased, respectively, from 0.2 to 3.6 kJ. The time of energy transfer into the circuit inductance was about 120-140 ns. Maintaining the diode resistance rise rate at 0.5 /ns has been shown. Diode power has been increased up to 170 GW. Further increase in power of the plasma-filled diode has been obtained using simulation circuit of the Megavolt (MV) range LTD. To simulate such a linear transformer, the driver circuit was made as Marx generator with coaxial water line (5.3 , 56 ns, and 1.5 MV), providing a current input of 160 kA into the 550-nH inductance in 120 ns. Stored energy in the inductance was about 7 kJ. The following diode parameters were obtained: 150 kA, 1.9 MV, and 250 GW at a resistance rise rate more than 0.5 /ns. The experiments prove that the resistance rise rate of the plasma-filled diode is constant on increasing the stored energy in the inductance up to 7 kJ. It allows scaling the power of an electron source based on the plasma-filled diode.

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Section: Power Increase By Mean Of the Diode Currentmentioning

confidence: 99%

Section: Power Increase By Mean Of the Diode Currentmentioning

confidence: 99%

Power Increase of the Electron Source Based on the Plasma-Filled Diode

Zherlitsyn

Kovalchuk

Pedin

2015

IEEE Trans. Plasma Sci.

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“…However, magnetic core transformer, which is widely used in the field of high power pulse power, has high coupling coefficient and high energy conversion efficiency (Mesyats et al, 2003;Su et al, 2009). IEBA based on Tesla transformer has been used in many fields, such as high power microwave driven (Miller et al, 1975;Weber et al, 1993;Tarasenko et al, 2005), X-ray radiography (Weber et al, 2008), and radiation effects testing (Weber et al, 2004) and so on.…”

Section: Introdutionmentioning

confidence: 99%

Study of low impedance intense electron-beam accelerator based on magnetic core Tesla transformer

Liu¹,

Zhang²,

Yang³

et al. 2012

Laser Part. Beams

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An intense electron-beam accelerator, which consists of a primary storage capacitor system, a magnetic core Tesla transformer, Blumlein pulse forming line of water dielectric, and a field-emission diode, are constructed and described. The experimental results show that the output voltage of transformer is more than 740 kV, the rise time is about 5 μs, the diode voltage is about 596 kV, electron beam current is about 60 kA, the duration is about 100 ns, and the power is 36 GW when charging voltage is 40 kV. It was suitable to drive magnetically insulated transmission line oscillator. And it can be also used in materials surface modification. This accelerator is very compact and works stably and reliably.

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“…P LASMA-FILLED diodes (PFDs) have been investigated experimentally [1]- [3] and theoretically [4]- [6] for many years. Applications of PFDs include materials processing, [7], [8] and improved coupling to electron-beam diodes [9], [10] and ion diodes [11].…”

Section: Introductionmentioning

confidence: 99%

Plasma-Filled Diode for High Dose-Rate Bremsstrahlung

Weber

Hinshelwood

Murphy

et al. 2004

IEEE Trans. Plasma Sci.

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A plasma-filled diode (PFD) technique is described for producing high dose-rate bremsstrahlung over small areas. A PFD was developed for this purpose using the Gamble II generator. For maximum dose-rate conditions, the short-circuit phase duration was 40 ns, after which the voltage increased to 1.8 MV and the total current in the diode was 0.5 MA. The X-ray pulsewidth was 8 ns, much less than the typical 50 ns pulsewidth with a vacuum diode. This PFD was adapted to the higher-current Saturn generator at 6-8 MA by making a 10-cm diameter circular array of 6, 9, or 12 isolated PFDs. Higher dose rates were obtained using fewer PFDs; about 1 10 12 rad/s with the 12-PFD array, 2 10 12 with nine PFDs and 4 10 12 with 6 PFDs. Analyses based on electrical and radiation diagnostics indicate that 40%-77% of the electrical current produces radiation at the time of maximum dose rate. The X-ray pulsewidth was typically 13-16 ns, less than the pulsewidth for standard (vacuum) bremsstrahlung diodes on Saturn. This system, with improvements in reproducibility, could provide a high dose-rate, small-area bremsstrahlung capability for high current generators.Index Terms-Bremsstrahlung, dose rate, plasma-filled diode (PFD), pulsed power.

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Electron Beam Generation in Plasma-Filled Diodes

Cited by 72 publications

References 12 publications

Power Increase of the Electron Source Based on the Plasma-Filled Diode

Power Increase of the Electron Source Based on the Plasma-Filled Diode

Study of low impedance intense electron-beam accelerator based on magnetic core Tesla transformer

Plasma-Filled Diode for High Dose-Rate Bremsstrahlung

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