Current Transmission Efficiency for Conical Magnetically Insulated Transmission Line on a 1.0-MV Linear Transformer Driver System

Guo, Fan; Zou, Wenkang; Liu, Laqun; Lin, Changxing; Wei, Bing; Liu, Dagang; Wang, Meng; Xie, Weiping

doi:10.1109/tps.2015.2453337

Cited by 13 publications

(4 citation statements)

References 29 publications

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“…The common-mode noise added to the B-dot sensors output signals is higher than that of B-dot monitors on the outer conductor which are at the ground potential. In fact, previous experiments conducted on the negative polarity 1.0 MV-LTD machine also suggested that the performance of the B-dot monitors on the inner electrode was usually not as perfect as those on the outer conductor [43]. However, the amplitudes of the load current given by the two groups of B-dot sensors are also in line with each other very well, and the peak value is about 108.0 kA.…”

Section: Experiments and Circuit Simulation Resultsmentioning

confidence: 79%

Design of a 1-MV induction cavity and validation of the two-dimensional circuit model

Guo

Xie

Wang

et al. 2019

Phys. Rev. Accel. Beams

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We present the design and test results of an induction cavity, which is a full-scale prototype cell of a prospective six-stage induction voltage adder. This induction cell runs in positive polarity and the output transmission line operates in the vacuum insulation state. The design methods and configurations of the azimuthal transmission line, insulation stack, magnetic core, cathode plate, and output transmission line in the induction cell are given in detail. The induction cavity is driven by one pulsed power system consisting of a tesla transformer, intermediate storage capacitor, laser triggered gas switch, pulse forming line, selfbreaking oil switch, and a water transmission line. A maximum voltage about 1.05 MV could be achieved across one 7.0 Ω water resistor load. A full circuit model including the primary energy storage section and pulse forming section is proposed. The circuit model also includes the two-dimensional circuit model of the induction cavity [Phys. Rev. Accel. Beams 20, 020401 (2017)]. The voltage and current waveforms across the feed port, azimuthal transmission line, insulation stack, and resistor load obtained during the experiment are compared with the circuit simulation results. It demonstrates that they can agree with each other very well.

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Section: Experiments and Circuit Simulation Resultsmentioning

confidence: 79%

Design of a 1-MV induction cavity and validation of the two-dimensional circuit model

Guo

Xie

Wang

et al. 2019

Phys. Rev. Accel. Beams

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“…There is electron current loss to the walls along downstream cylindrical MITL prior to the edge where the entire current is shunted to the anode wall as anode current. 19,21,22 In addition, the electron loss front will cut down the pulse width. The cathode current amplitudes of the PIC simulation by probes P1, P2, P3, P4, P5 and P6 are 0.97 MA, 0.86 MA, 0.78 MA, 0.77 MA, 0.77 MA, 0.38 MA.…”

Section: A Downstream Mitl Work On Self-limited Flowmentioning

confidence: 99%

PIC simulation of the vacuum power flow for a 5 terawatt, 5 MV, 1 MA pulsed power system

Liu

Zou²,

Liu

et al. 2018

AIP Advances

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In this paper, a 5 Terawatt, 5 MV, 1 MA pulsed power system based on vacuum magnetic insulation is simulated by the particle-in-cell (PIC) simulation method. The system consists of 50 100-kV linear transformer drive (LTD) cavities in series, using magnetically insulated induction voltage adder (MIVA) technology for pulsed power addition and transmission. The pulsed power formation and the vacuum power flow are simulated when the system works in self-limited flow and load-limited flow. When the pulsed power system isn’t connected to the load, the downstream magnetically insulated transmission line (MITL) works in the self-limited flow, the maximum of output current is 1.14 MA and the amplitude of voltage is 4.63 MV. The ratio of the electron current to the total current is 67.5%, when the output current reached the peak value. When the impedance of the load is 3.0 Ω, the downstream MITL works in the self-limited flow, the maximums of output current and the amplitude of voltage are 1.28 MA and 3.96 MV, and the ratio of the electron current to the total current is 11.7% when the output current reached the peak value. In addition, when the switches are triggered in synchronism with the passage of the pulse power flow, it effectively reduces the rise time of the pulse current.

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“…The prime power source of such a machine may consist of a system of linear transformer drivers (LTDs) [7][8][9][10][11][12][13][14][15][16][17][18] fast Marx generators (FMGs) [7,9,[19][20][21][22] or impedance-matched Marx generators (IMGs) [18,23,24]. The pulsed power community has been developing LTD technology for 20 years on various single-cavity experiments [16,[25][26][27][28][29][30][31][32][33][34][35][36][37], multicavity (single "module") experiments [14,27,32,35,[38][39][40][41][42][43][44] and a few multimodule experiments [11,14]. The work presented here describes the design and performance of the first two meter...…”

Section: Introductionmentioning

confidence: 99%

100 GW linear transformer driver cavity: Design, simulations, and performance

Douglass¹,

Hutsel²,

Leckbee³

et al. 2018

Phys. Rev. Accel. Beams

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Herein we present details of the design, simulation, and performance of a 100-GW linear transformer driver (LTD) cavity at Sandia National Laboratories. The cavity consists of 20 "bricks." Each brick is comprised of two 80 nF, 100 kV capacitors connected electrically in series with a custom, 200 kV, threeelectrode, field-distortion gas switch. The brick capacitors are bipolar charged to AE100 kV for a total switch voltage of 200 kV. Typical brick circuit parameters are 40 nF capacitance (two 80 nF capacitors in series) and 160 nH inductance. The switch electrodes are fabricated from a WCu alloy and are operated with breathable air. Over the course of 6,556 shots the cavity generated a peak electrical current and power of 1.03 MA (AE1.8%) and 106 GW (AE3.1%). Experimental results are consistent (to within uncertainties) with circuit simulations for normal operation, and expected failure modes including prefire and latefire events. New features of this development that are reported here in detail include: (1) 100 ns, 1 MA, 100-GW output from a 2.2 m diameter LTD into a 0.1 Ω load, (2) high-impedance solid charging resistors that are optimized for this application, and (3) evaluation of maintenance-free trigger circuits using capacitive coupling and inductive isolation.

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Current Transmission Efficiency for Conical Magnetically Insulated Transmission Line on a 1.0-MV Linear Transformer Driver System

Cited by 13 publications

References 29 publications

Design of a 1-MV induction cavity and validation of the two-dimensional circuit model

Design of a 1-MV induction cavity and validation of the two-dimensional circuit model

PIC simulation of the vacuum power flow for a 5 terawatt, 5 MV, 1 MA pulsed power system

100 GW linear transformer driver cavity: Design, simulations, and performance

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