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A.A. Kim,
V.A. Sinebryukhov,
B.M. Kovalchuk, A.N. Bastrikov,
V.G. Durakov,
S.N. Volkov,
S.V. Frolov,
V.M. Alexeenko,
M.G. Mazarakis,
D.H. McDaniel,
C.L. Olson,
K.W. Struve,
R.M. Gilgenbaeh
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ABSTRACT: Summary form only given. A module consisting of five 100 GW Fast LTD cavities stacked in series was tested with e-beam diode load to study how a number of cavities behave and add their energy, power and voltage output in a voltage adder configuration assembly. In this report we present the design of the module and diode, and compare test results with simulations.
Plasma Science, 2007. ICOPS 2007. IEEE 34th International Conference on; 07/2007
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M.G. Mazarakis,
W.E. Fowler,
D.H. McDaniel,
C.L. Olson,
S.T. Rogowski,
R.A. Sharpe,
K.W. Struve,
A.A. Kim,
V.A. Sinebryukhov, A.N. Bastrikov,
S.N. Volkov,
R.M. Gilgenbach
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ABSTRACT: Summary form only given. Sandia Laboratories is actively pursuing the development of new accelerators based on the novice technology of linear transformer driver (LTD). LTD based drivers are considered for many applications including future very high current Z-pinch ICF (inertial confinement fusion) drivers like ZX and Z-pinch IFE (inertial fusion energy). The high current LTD driver experimental research is concentrated on two aspects: first, to study the repetition rate capabilities, life time and jitter of the LTD cavities; and second to study how a number of cavities behave and add their energy, power and voltage output in a voltage adder configuration assembly. The repetition rate and life time studies are being done in the Sandia high current LTD laboratory utilizing a prototype 500-kA, 100-kV LTD cavity. The voltage adder experiments are being conducted jointly at the high current electronic institute (HCEI) in Tomsk, Russia where a number of 1-MA cavities are being built under Sandia contract. Experimental arrangements and first experimental results are presented and analyzed.
Plasma Science, 2007. ICOPS 2007. IEEE 34th International Conference on; 07/2007
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A.A. Kim,
V.A. Sinebryukhov,
B.M. Kovalchuk, A.N. Bastrikov,
V.G. Durakov,
S.N. Volkov,
S.V. Frolov,
V.M. Alexeenko,
F. Bayol,
C. Drouilly,
F. Cubaynes,
L. Veron,
M. Toury,
C. Vermare,
R. Nicolas
[show abstract]
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ABSTRACT: Summary form only given. In the report, we present the new super fast LTD prototype which delivers a 75 ns FWHM voltage pulse into a -0.5-0.6 Ohm matched load at ~20 GW power. The stage is designed without of peaking capacitors, it includes 32 GA35436 (8 nF, 100 kV) storage capacitors, 16 spark gap switches and magnetic core with reduced thickness of the tape (50 mum) to reduce the current losses. This stage prototype was specifically designed with an hemispherical vessel to operate with compressed gas (SF6, SF6/dry air mixtures, and pure dry air) up to 6 ata pressure, as well as with transformer oil. Test results of the stage prototype will be given and compared with numerical simulation.
Plasma Science, 2007. ICOPS 2007. IEEE 34th International Conference on; 07/2007
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[show abstract]
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ABSTRACT: Fast LTD technology looks promising for making the pulsed power generators for some applications more compact and less expensive because it does not need any pulse forming lines to produce nanosecond output pulses. In the report we present the 1 MV generator that is being produced to demonstrate the technology capability. The generator is designed to deliver a 1 MV, 125 kA, /spl sim/50 ns width at 80% of peak amplitude pulse to the /spl sim/8 Ohm vacuum diode. The stored energy of the generator is 14 kJ, the footprint /spl sim/ 2 m/sup 2/.
Pulsed Power Conference, 2003. Digest of Technical Papers. PPC-2003. 14th IEEE International; 07/2003
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A.N. BASTRIKOV ,
V.A. VIZIR ,
S.N. VOLKOV ,
V.G. DURAKOV ,
A.M. EFREMOV ,
V.B. ZORIN ,
A.A. KIM ,
B.M. KOVALCHUK ,
E.V. KUMPJAK ,
S.V. LOGINOV ,
V.A. SINEBRYUHOV ,
N.V. TSOU ,
V.V. CERVJAKOV ,
V.P. YAKOVLEV ,
G.A. MESYATS
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ABSTRACT: Primary storages based on a linear transformer scheme were
developed long ago. In this scheme, the secondary turn only
has to be insulated from the high output voltage. Seven years
ago at the High Current Electronics Institute (HCEI) a primary
storage based on a linear transformer scheme and called the
Linear Transformer Driver (LTD) stage was designed. In LTD stages,
the primary turn, the storage capacitors with the switches,
the core, and the outer conductor of the secondary turn are
integrated into the stage cavity representing one separate building
block of the primary storage. The body of the LTD cavity keeps
ground potential during the shot allowing us to assemble them
in series or in parallel depending on load requirements. Such
flexibility of the storage structure and high output power of
the LTD stages allows us to replace for some applications the
traditional water line technology with LTD-based primary storages
that are connected directly to the load (Direct Drive
Scheme—DDS). In this article, we present the design of
several LTD stages developed at HCEI and give examples of
high-power energy storages produced by using the LTD technology.
Laser and Particle Beams 03/2003; 21(02):295 - 299. · 1.62 Impact Factor
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[show abstract]
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ABSTRACT: LTD stages are designed to be used as a primary energy storage in high power pulsed generators. Previously the LTD stages with the current rise time of 1000 ns and 450 ns were reported. Present report describes the design and test results of the LTD stage that provides ∼200 kA rising in 100 ns in the matched ∼0.4 Ohm load.
Pulsed Power Plasma Science, 2001. PPPS-2001. Digest of Technical Papers; 02/2001
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[show abstract]
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ABSTRACT: In experiments on GIT4, a scheme with the load connected upstream
from the plasma opening switch (POS) was investigated. The load was
connected to the generator output through the surface self-breaking
switch. The current switching into the different inductive loads was
tested. It was found that the time the POS is open depends on the value
of the load inductance. It was demonstrated also that surface
self-breaking switch can be applied for switching currents rising at
~2·10<sup>13</sup> A/s
Pulsed Power Conference, 1999. Digest of Technical Papers. 12th IEEE International; 02/1999
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ABSTRACT: A pulse generator with a power of 0.1 TW, an amplitude of up to 2 MV and {approximately}1.5-nsec rise time is described. A Marx voltage pulse generator charges a low-inductance capacitor (1.8 nF) and a radial line (0.9 nF) to a voltage of {approximately}2 MV in 200 nsec. At the peak voltage, a water switch is actuated at the center of the radial line resulting in {approximately} 2.5-MV voltage pulse at the end of the line. This pulse propagates along the oil-insulated line. The line is connected to an oil-filled peaking switch with a metal diaphragm, which reduces the transfer capacitance of the discharge gap to 5 pF to match the radial-line wave impedance to the load connected to the switch output. A crossover switch may be used when operating in the short-pulse mode. A pulse with a width of up to 20 nsec has been generated across a load equivalent matched to the line.
Instruments and Experimental Techniques 09/1995; 38(2). · 0.36 Impact Factor
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[show abstract]
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ABSTRACT: A pulsed generator with a power of 0.1 TW, an amplitude of up to 2
MV and ~1.5 nsec rise time is described. A Marx generator charges a low
inductive capacitor (1.8 nF) and a radial line (0.9 nF) to a voltage of
~2 MV in 200 nsec. At the peak voltage, a water switch breaks down at
the center of the radial line resulting in a ~2.5 MV voltage pulse at
the end of the line. This pulse propagates along the oil-insulated line.
The line is connected to an oil-filled peaking switch with a metal
diaphragm, which reduces the transfer capacitance of the discharge gap
to 5 pF in order to match the radial line with a load being connected to
the switch output. A crowbar switch may be used for operation in the
short-pulse mode. A pulse with a width of up to 20 nsec has been
generated on a matched load equivalent
Pulsed Power Conference, 1995. Digest of Technical Papers., Tenth IEEE International; 08/1995
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A.N. Bastrikov,
S.P. Bugaev,
V.M. Bystritskii,
A.M. Volkov,
S.V. Grigoriev,
A.A. Kim,
B.M. Koval'chuk,
V.M. Kokeshenev,
Y.E. Krasik,
I.V. Lisitsyn,
G.A. Mesyats,
V.A. Yakovlev
[show abstract]
[hide abstract]
ABSTRACT: Summary form only. The results of an investigation of ion and electron flows in a coaxial microsecond plasma opening switch (POS) are given. A 1-μs front duration POS with outer and inner electrodes with diameters of 210 mm and 75 mm, respectively, switched a 1-MA pulse during 0.1 μs to a 120-cm-long short-circuited coaxial line with matching diameters. The polarity of the inner electrode was negative. The plasma of the POS was injected from the outer electrode by 32 plasma guns of capillary type. The typical POS voltage was 0.9-1.2 MV. The calculated energy losses in the POS during the switching phase reached 0.1-0.15 MJ. The location and distribution of the heat absorbed along the POS electrodes were determined. Measurements of electron flow showed that heat energy absorbed by the POS anode (which made up 30-40% of the total energy losses in the POS) did not affect the flow. Nuclear activation measurements showed that the energy of the convergent proton flow was in good agreement with the voltage generated in the POS and that almost all of the energy input in the inner electrode could be provided by intense ion flow
Plasma Science, 1989. IEEE Conference Record - Abstracts., 1989 IEEE International Conference on; 06/1989
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A.N. Bastrikov,
A.A. Kim,
B.M. Kovalchuk,
E.V. Kumpjak,
S.V. Loginov,
V.I. Manylov,
V.A. Visir,
V.P. Yakovlev,
B. Etlicher,
A. Chuvatin,
L. Frescaline,
J.F. Leon,
P. Monjaux,
F. Kovacs,
D. Huet,
F. Bayol
[show abstract]
[hide abstract]
ABSTRACT: The main advantage of the primary storage based on linear transformer scheme is the ground potential on the capacitor bodies during the shot, allowing exclusion of the total output voltage insulation of the highest stages, and to trigger all the stages simultaneously by using an external trigger pulse. The problem was to build a fast linear transformer driver (LTD), providing both high efficiency of energy transfer into the secondary turn and the current rise time below /spl sim/1 CLs, because of relatively high inductance of the caps and the switches. The key elements of the LTD described below are the HAEFELY capacitors (75 kV, 5.65 /spl mu/F, 13 nH, 40 mOhm, or 90 kV, 3.95 /spl mu/F, 10 nH, 13 mOhm) and the multi gap, multi channel spark switches developed at HCEI for SYRINX project (90 kV, 0.7 MA, 8.5 nH). This LTD was designed as an alternative to the Marx generator in order to improve the performance of the IES technology in the direct drive approach where the only unit providing power multiplication on the load is the POS. The LTD was designed as a single stage with two HAEFELY caps in parallel. The authors describe a 75 kV LTD stage with oil insulation and a 90 kV LTD stage with SF/sub 6/ insulation.
Pulsed Power Conference, 1997. Digest of Technical Papers. 1997 11th IEEE International;
