Capacitor units with air insulation for linear transformers

Zherlitsyn, A. A.; Kovalchuk, B. M.; Smorudov, G.V.

doi:10.1134/s0020441209060098

Cited by 18 publications

(8 citation statements)

References 1 publication

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“…4 for mode 5. Diode resistance increases to peak value of 15 in 30 ns, by the law close to the linear, with a rise rate of k ∼ 0.5 /ns. Diode voltage reaches to peak value of 1.2 MV in 25 ns.…”

Section: Power Increase By Mean Of the Diode Currentmentioning

confidence: 89%

“…The LTD stage consists of two identical modules and each module includes two capacitor blocks 1. Each capacitor block [15] combines two GA35426 capacitors (100 kV, 40 nF) and a multichannel spark-gap switch. The capacitors are embedded into an epoxy compound housing, making possible their operation in an atmospheric-pressure air at voltages up to 100 kV.…”

Section: Design Of the Ltdmentioning

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: 89%

Section: Design Of the Ltdmentioning

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 distance between cathode 2 and anode 5 is 30 mm, and the distance from the end of the plasma gun to the anode is 40 mm. The voltage is applied to the plasma gun from the generator based on a capacitor unit with a capacitance of 16 or 80 nF [9]. The waveform and amplitude of the dis charge via the gun is varied by the generator capaci tance, the charging voltage, and the limiting resistance in the discharge circuit.…”

Section: Layout Of the Experimentsmentioning

confidence: 99%

Capillary plasma gun for a high-current plasma-filled diode

2014

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A capillary type plasma gun designed for generating a plasma channel with a characteristic diam eter of ≈10 mm in a high current relativistic electron diode has been tested. The dynamics of ion flow prop agation and the effect of the plasma source parameters on the current amplitude of the low resistance phase of the plasma filled diode have been studied. A low resistance phase duration of ≈120 ns has been attained at a current of ≈185 kA in the diode based on a unit gun with a 0.4 mm diameter capillary. The possibility of increasing the diode current by using several capillaries in a gun is demonstrated.

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“…At arrival of the triggering pulse with polarity, opposite to the main pulse, homogeneous voltage distribution is distorted and the switch gaps breaks down sequentially. The capacitor block has been previously investigated and tested [10,11]. A twodimensional simulation of real switch geometry with a back current grounded electrode has been performed for 100 kV charging voltage.…”

Section: Experimental Setup a Capacitor Blockmentioning

confidence: 99%

“…Test results with 0:1 load are summarized in Table I. Two electron accelerators have been built on the base of this stage: (a) a compact accelerator from six LTD-4 stages for small-scale experiments [9] and (b) a high-current electron-beam accelerator for pumping of a Xe 2 lamp with 24 stages LTD-4 [11].…”

Section: B Stage Ltd-20mentioning

confidence: 99%

Pulse generators based on air-insulated linear-transformer-driver stages

Kovalchuk

Kharlov

Kumpyak

et al. 2013

Phys. Rev. ST Accel. Beams

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In this paper we present the design and test results of pulse generators based on air-insulated lineartransformer-driver stages that drive a vacuum transmission line. A custom designed unit, referred to as a capacitor block, was developed for use as a main structural element of the transformer stages. It incorporates two capacitors GA 35426 (40 nF, 100 kV) and a multichannel multigap gas switch. Two types of stages were developed: (1) stage LTD-20 with four modules in parallel and five capacitor blocks in each module (in tests of this stage current amplitude up to 850 kA with $140 ns rise time was obtained on a 0:05 load at 100 kV charging voltage); (2) stage LTD-4 with two modules in parallel and two capacitor blocks in each module. Several installations were built on the base of these stages, including a linear transformer, consisting of two identical LTD-20 stages in series, and a high power electron accelerator on the base of LTD-4 stages. The design, tests results, and main problems are presented and discussed in this paper for these installations.

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Capacitor units with air insulation for linear transformers

Cited by 18 publications

References 1 publication

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

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

Capillary plasma gun for a high-current plasma-filled diode

Pulse generators based on air-insulated linear-transformer-driver stages

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