Megavolt range voltage measurement in vacuum through a short-circuited line

Belomyttsev, S. Ya.; Grishkov, A. A.; Kovalchuk, B. M.; Pedin, N. N.; Zherlitsyn, A. A.

doi:10.1063/1.3646470

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…The line 5 was also employed for additional diagnostics of the diode voltage. This method is based on the measurement of the current wave in the short-circuited vacuum coaxial line, where external magnetic field is applied before arrival of the main high-voltage pulse [19].…”

Section: A Experimental Schemementioning

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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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: A Experimental Schemementioning

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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“…Confirmation that the diode voltage of the amplitude ≈1 MV had been realized was obtained using a duplicating method based on a short-circuited measuring line with the initial bias current. 16 Statistics of the output pulse parameters for 65 switching-on at a fixed time delay t d = 1.3 μs has been studied. The average current amplitude in the diode and the root-mean-square deviation of parameters of separate pulses are x ± σ = 110 ± 10 kA.…”

Section: B Parameters Of a Plasma-filled Diode With A Silicone Rubbementioning

confidence: 99%

Plasma-filled diode based on the coaxial gun

Zherlitsyn

Kovalchuk

Pedin

2012

Review of Scientific Instruments

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The paper presents the results of studies of a coaxial gun for a plasma-filled electron diode. Effects of the discharge channel diameter and gun current on characteristics of the plasma and pulse generated in the diode were investigated. The electron beam with maximum energy of ≥1 MeV at the current of ≈100 kA was obtained in the experiments with a plasma-filled diode. The energy of ≈5 kJ with the peak power of ≥100 GW dissipated in the diode.

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“…To this end, we have developed an inductive voltage monitor (IVM) for Z. Other approaches are certainly possible, e.g., resistive dividers [33,34] and/or vacuum transmission line voltmeters [35]; however, we chose the IVM approach for its relative simplicity, lower cost, and lower potential for debris damage to the accelerator. The results of fielding this IVM on a wide variety of Z experiments is the subject of the remainder of this paper, which is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Voltage measurements at the vacuum post-hole convolute of theZpulsed-power accelerator

Waisman

McBride

Cuneo

et al. 2014

Phys. Rev. ST Accel. Beams

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Presented are voltage measurements taken near the load region on the Z pulsed-power accelerator using an inductive voltage monitor (IVM). Specifically, the IVM was connected to, and thus monitored the voltage at, the bottom level of the accelerator's vacuum double post-hole convolute. Additional voltage and current measurements were taken at the accelerator's vacuum-insulator stack (at a radius of 1.6 m) by using standard D-dot and B-dot probes, respectively. During postprocessing, the measurements taken at the stack were translated to the location of the IVM measurements by using a lossless propagation model of the Z accelerator's magnetically insulated transmission lines (MITLs) and a lumped inductor model of the vacuum post-hole convolute. Across a wide variety of experiments conducted on the Z accelerator, the voltage histories obtained from the IVM and the lossless propagation technique agree well in overall shape and magnitude. However, large-amplitude, high-frequency oscillations are more pronounced in the IVM records. It is unclear whether these larger oscillations represent true voltage oscillations at the convolute or if they are due to noise pickup and/or transit-time effects and other resonant modes in the IVM. Results using a transit-time-correction technique and Fourier analysis support the latter. Regardless of which interpretation is correct, both true voltage oscillations and the excitement of resonant modes could be the result of transient electrical breakdowns in the post-hole convolute, though more information is required to determine definitively if such breakdowns occurred. Despite the larger oscillations in the IVM records, the general agreement found between the lossless propagation results and the results of the IVM shows that large voltages are transmitted efficiently through the MITLs on Z. These results are complementary to previous studies [R. D. McBride et al., Phys. Rev. ST Accel. Beams 13, 120401 (2010)] that showed efficient transmission of large currents through the MITLs on Z. Taken together, the two studies demonstrate the overall efficient delivery of very large electrical powers through the MITLs on Z.

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Megavolt range voltage measurement in vacuum through a short-circuited line

Cited by 5 publications

References 8 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

Plasma-filled diode based on the coaxial gun

Voltage measurements at the vacuum post-hole convolute of theZpulsed-power accelerator

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