GIT16: A megajoule pulse generator with plasma switch for a Z-pinch load

Bugaev, S. P.; Волков, А. М.; Kim, A. A.; Kiselev, V. N.; Kovalchuk, B. M.; Kovsharov, N. F.; Kokshenev, V. A.; Kurmaev, N. E.; Loginov, S. V.; Mesyats, G. A.; Fursov, F. I.; Khuzeev, A. P.

doi:10.1007/bf02524303

Cited by 31 publications

(18 citation statements)

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“…Such groove has been used at large pulsed power generators for measurement of currents of several MA and rise time of hundreds of nanoseconds. [16][17][18][19][20] A high-bandwidth groove current probe was used for direct measurement of axial electronic mA-currents circulating in the wake of a short, intense infrared femtosecond laser pulse propagating in a gas in the form of a filament by Zhou et al 11 In the laser-produced plasma experiments, the voltage signal measured on a target is an oscillating relaxation, usually responding to a much faster pulse excitation, as it is shown in Fig. 5 presented in Ref.…”

Section: Target Current Probementioning

confidence: 99%

“…[10][11][12][13][14][15][16][17][18][19][20] Numerous voltage and current sensors have been developed to be reliable and stable mainly in the pinch experiments. [14][15][16][17][18][19][20] The implemented single-turn-coil probe is based on the Rogowski principle and extends the number of groove probes developed by the pulsed power and accelerator community in the past decades. For example, a current probe based on small magnetic loops with nanosecond rise time was developed by Copeland et al 12 for detection of electron beam return currents of ∼65 kA.…”

Section: Target Current Probementioning

confidence: 99%

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Measurement of the target current by inductive probe during laser interaction on terawatt laser system PALS

Cikhardt

Krása

Marco

et al. 2014

Review of Scientific Instruments

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Measurements of the return-current flowing through a solid target irradiated with the sub-nanosecond kJ-class Prague Asterix Laser System is reported. A new inductive target probe was developed which allows us measuring the target current derivative in a kA/ns range. The dependences of the target current on the laser pulse energy for cooper, graphite, and polyethylene targets are reported. The experiment shows that the target current is proportional to the deposited laser energy and is strongly affected by the shot-to-shot fluctuations. The corresponding maximum target charge exceeded a value of 10 μC. A return-current dependence of the electromagnetic pulse produced by the laser-target interaction is presented.

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Section: Target Current Probementioning

confidence: 99%

Section: Target Current Probementioning

confidence: 99%

Measurement of the target current by inductive probe during laser interaction on terawatt laser system PALS

Cikhardt

Krása

Marco

et al. 2014

Review of Scientific Instruments

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“…One parameter that we recognized that played some role was the peak of the "effective" voltage at the Z-pinch load V eff ¼ V À ðL 0 þ L l ÞdI=dt, where V is the voltage at the microsecond plasma-opening-switch, L 0 þ L l is the total downstream inductance, and L l is the inductance of a Z-pinch load. 28,34 We call this voltage "effective" since we subtract the ðL 0 þ L l ÞdI=dt inductive term. The load inductance L l ðtÞ was calculated numerically from the differential equation _ L l I ¼ V À ðL 0 þ L l Þ _ I, where a Z-pinch resistivity R l was assumed to be negligible.…”

Section: Neutron Yieldmentioning

confidence: 99%

“…28 The GIT-12 is the current generator with an intermediate inductive storage of the energy and a microsecond plasma opening switch. At a 50 kV charging voltage, the generator stored an energy of 2.6 MJ.…”

Section: A Current Generatormentioning

confidence: 99%

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Deuterium gas puff Z-pinch at currents of 2 to 3 mega-ampere

et al. 2012

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Deuterium gas-puff experiments have been carried out on the GIT-12 generator at the Institute of High Current Electronics in Tomsk. The emphasis was put on the study of plasma dynamics and neutron production in double shell gas puffs. A linear mass density of deuterium (D2) varied between 50 and 85 μg/cm. Somewhat problematic was a spread of the D2 gas at a large diameter in the central anode–cathode region. The generator operated in two regimes, with and without a plasma opening switch (POS). When the POS was used, a current reached a peak of 2.7 MA with a 200 ns rise time. Without the POS, a current rise time approached 1500 ns. The influence of different current rise times on neutron production was researched. Obtained results were important for comparison of fast deuterium Z-pinches with plasma foci. Average DD neutron yields with and without the POS were about 1011. The neutron yield seems to be dependent on a peak voltage at the Z-pinch load. In all shots, the neutron emission started during stagnation. At the beginning of the neutron production, the neutron emission correlated with soft x-rays and a significant fraction of neutrons could be explained by the thermonuclear mechanism. Nevertheless, a peak of the neutron emission occurred 40 ns after a soft x-ray peak. At this very moment, hard x-rays above 1 MeV were detected and a rapid expansion with a velocity of 3×105 m/s was observed. In the case of the POS, 1 MeV widths of radial neutron spectra implied that there are deuterons with the energy above 200 keV moving in the radial direction. On the basis of D2 gas puff experiments in the 0.3–17 MA region, the neutron yield dependence on a current as Y∝I3.0±0.2 was proposed.

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Pulse Generators with Plasma Opening Switches

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GIT16: A megajoule pulse generator with plasma switch for a Z-pinch load

Cited by 31 publications

References 1 publication

Measurement of the target current by inductive probe during laser interaction on terawatt laser system PALS

Measurement of the target current by inductive probe during laser interaction on terawatt laser system PALS

Deuterium gas puff Z-pinch at currents of 2 to 3 mega-ampere

Pulse Generators with Plasma Opening Switches

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